docs: update version references to v10.3.2 (#1104 )

Update `uses: astral-sh/setup-uv@...` references in documentation to `07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2`. Co-authored-by: eifinger <1481961+eifinger@users.noreply.github.com>
chore: update known checksums for 0.13.5 (#1103 )
2026-10-25 00:37:44 +00:00 · 2026-10-22 11:25:32 +02:00 · 2026-10-22 10:18:56 +02:00 · 2026-10-21 22:51:19 +02:00 · 2026-10-21 16:17:16 +02:00 · 2026-10-21 09:58:30 +02:00
45 changed files with 12755 additions and 13799 deletions
@@ -1,2 +1,3 @@
 * text=auto eol=lf
 dist/** -diff linguist-generated=true
+src/download/checksum/known-checksums.json linguist-generated=true
@@ -8,6 +8,10 @@ self-hosted-runner:
 # Empty array means no configuration variable is allowed.
 config-variables: null
 paths:
+  .github/workflows/**/*.{yml,yaml}:
+    ignore:
+      - 'specifying action "\$/" in invalid format because ref is missing'
+      - 'reusable workflow call "\$/.+" at "uses" is not following the format'
  .github/workflows/test.yml:
    ignore:
      - 'invalid runner name.+'
@@ -5,11 +5,11 @@ updates:
    schedule:
      interval: daily
    cooldown:
-      default-days: 7
+      default-days: 30

  - package-ecosystem: npm
    directory: /
    schedule:
      interval: daily
    cooldown:
-      default-days: 7
+      default-days: 30
@@ -47,7 +47,7 @@ jobs:

      # Initializes the CodeQL tools for scanning.
      - name: Initialize CodeQL
-        uses: github/codeql-action/init@5595ccaf912efad79be6eef63a5619ff05969be3 # v4.37.6
+        uses: github/codeql-action/init@1c5b675653bb5c22dbe9b12b556ec555138e09fd # v4.38.1
        with:
          languages: ${{ matrix.language }}
          source-root: src
@@ -59,7 +59,7 @@ jobs:
      # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
      # If this step fails, then you should remove it and run the build manually (see below)
      - name: Autobuild
-        uses: github/codeql-action/autobuild@5595ccaf912efad79be6eef63a5619ff05969be3 # v4.37.6
+        uses: github/codeql-action/autobuild@1c5b675653bb5c22dbe9b12b556ec555138e09fd # v4.38.1

      # ℹ️ Command-line programs to run using the OS shell.
      # 📚 https://git.io/JvXDl
@@ -73,4 +73,4 @@ jobs:
      #   make release

      - name: Perform CodeQL Analysis
-        uses: github/codeql-action/analyze@5595ccaf912efad79be6eef63a5619ff05969be3 # v4.37.6
+        uses: github/codeql-action/analyze@1c5b675653bb5c22dbe9b12b556ec555138e09fd # v4.38.1
@@ -116,7 +116,7 @@ jobs:
    name: Update docs
    needs:
      - release
-    uses: ./.github/workflows/update-docs.yml
+    uses: $/.github/workflows/update-docs.yml
    permissions:
      contents: write
      pull-requests: write
@@ -27,13 +27,15 @@ jobs:
      - name: Actionlint
        uses: eifinger/actionlint-action@1fc89649be682d16ec5cf65ea16e269eb88d3982 # v1.10.2
      - name: Run zizmor
-        uses: zizmorcore/zizmor-action@3dc1ecc9bcb9e94e9b2c709687979e1298497054 # v0.6.2
+        uses: zizmorcore/zizmor-action@cc914d7f3750a2d13d75c7f184a1060aa0e9d482 # v0.6.4
      - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
        with:
          node-version-file: .nvmrc
          cache: npm
      - run: |
          npm ci --ignore-scripts
+      - name: Verify npm package signatures
+        run: npm audit signatures
      - run: |
          npm run all
      - name: Check all jobs are in all-tests-passed.needs
@@ -49,14 +51,14 @@ jobs:
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
-        os: [ubuntu-latest, macos-latest, macos-14, windows-latest]
+        os: [ubuntu-latest, macos-latest, macos-15, windows-latest]
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          persist-credentials: false
      - name: Install latest version
        id: setup-uv
-        uses: ./
+        uses: $/
      - run: uv sync
        working-directory: __tests__/fixtures/uv-project
        shell: bash
@@ -81,7 +83,7 @@ jobs:
          persist-credentials: false
      - name: Install with UV_NO_MODIFY_PATH set
        id: setup-uv
-        uses: ./
+        uses: $/
        env:
          UV_NO_MODIFY_PATH: 1
      - run: |
@@ -130,7 +132,7 @@ jobs:
          persist-credentials: false
      - name: Install version ${{ matrix.input.version-input }} with strategy ${{ matrix.input.resolution-strategy || 'highest' }}
        id: setup-uv
-        uses: ./
+        uses: $/
        with:
          version: ${{ matrix.input.version-input }}
          resolution-strategy: ${{ matrix.input.resolution-strategy || 'highest' }}
@@ -154,11 +156,8 @@ jobs:
      matrix:
        version-input: ["latest", ">=0.8"]
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-        with:
-          persist-credentials: false
      - name: Install version ${{ matrix.version-input }}
-        uses: ./
+        uses: $/
        with:
          version: ${{ matrix.version-input }}
      - name: Latest version gets installed
@@ -198,7 +197,7 @@ jobs:
        with:
          persist-credentials: false
      - name: Install version from ${{ matrix.input.working-directory }}
-        uses: ./
+        uses: $/
        with:
          working-directory: ${{ matrix.input.working-directory }}
      - name: Correct version gets installed
@@ -224,7 +223,7 @@ jobs:
        with:
          persist-credentials: false
      - name: Install version from ${{ matrix.input.version-file }}
-        uses: ./
+        uses: $/
        with:
          version-file: ${{ matrix.input.version-file }}
      - name: Correct version gets installed
@@ -242,7 +241,7 @@ jobs:
          persist-credentials: false
      - name: Install versions from .tool-versions
        id: setup-uv
-        uses: ./
+        uses: $/
        with:
          version-file: "__tests__/fixtures/.tool-versions"
      - name: Verify Python version from .tool-versions
@@ -267,7 +266,7 @@ jobs:
          persist-credentials: false
      - name: Install using malformed pyproject.toml
        id: setup-uv
-        uses: ./
+        uses: $/
        with:
          working-directory: "__tests__/fixtures/malformed-pyproject-toml-project"
      - run: uv --help
@@ -286,7 +285,7 @@ jobs:
        with:
          persist-credentials: false
      - name: Checksum matches expected
-        uses: ./
+        uses: $/
        with:
          version: "0.3.2"
          checksum: ${{ matrix.inputs.checksum }}
@@ -300,7 +299,7 @@ jobs:
        with:
          persist-credentials: false
      - name: Install default version
-        uses: ./
+        uses: $/
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
      - run: uv sync
@@ -309,25 +308,19 @@ jobs:
  test-uvx:
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-        with:
-          persist-credentials: false
      - name: Install default version
-        uses: ./
-      - run: uvx ruff --version
+        uses: $/
+      - run: uvx ruff@0.14.10 --version

  test-tool-install:
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
-        os: [ubuntu-latest, macos-latest, macos-14, windows-latest]
+        os: [ubuntu-latest, macos-latest, macos-15, windows-latest]
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-        with:
-          persist-credentials: false
      - name: Install default version
-        uses: ./
-      - run: uv tool install ruff
+        uses: $/
+      - run: uv tool install ruff==0.14.10
      - run: ruff --version

  test-python-version:
@@ -341,7 +334,7 @@ jobs:
          persist-credentials: false
      - name: Install latest version
        id: setup-uv
-        uses: ./
+        uses: $/
        with:
          python-version: 3.13.1t
      - name: Verify UV_PYTHON is set to correct version
@@ -356,9 +349,14 @@ jobs:
          if [ "$PYTHON_VERSION" != "3.13.1t" ]; then
            exit 1
          fi
+          if [ -n "$PYTHON_RUNTIME_ID" ]; then
+            echo "python-runtime-id should be empty without environment activation"
+            exit 1
+          fi
        shell: bash
        env:
          PYTHON_VERSION: ${{ steps.setup-uv.outputs.python-version }}
+          PYTHON_RUNTIME_ID: ${{ steps.setup-uv.outputs.python-runtime-id }}
      - run: uv sync
        working-directory: __tests__/fixtures/uv-project

@@ -368,12 +366,9 @@ jobs:
      matrix:
        os: [ubuntu-latest, macos-latest, windows-latest]
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-        with:
-          persist-credentials: false
      - name: Install latest version
        id: setup-uv
-        uses: ./
+        uses: $/
        with:
          python-version: 3.13.1t
          activate-environment: true
@@ -407,12 +402,9 @@ jobs:
      matrix:
        os: [ubuntu-latest, macos-latest, windows-latest]
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-        with:
-          persist-credentials: false
      - name: Install latest version
        id: setup-uv
-        uses: ./
+        uses: $/
        with:
          python-version: 3.13.1t
          activate-environment: true
@@ -454,13 +446,19 @@ jobs:
              raise SystemExit(f"Python is not running from custom venv: {sys.executable}")
          PY
        shell: bash
+      - name: Verify Python runtime ID from custom venv
+        run: |
+          case "$PYTHON_RUNTIME_ID" in
+            cpython-3.13.1+freethreaded-*) ;;
+            *) echo "Wrong Python runtime ID: $PYTHON_RUNTIME_ID"; exit 1 ;;
+          esac
+        shell: bash
+        env:
+          PYTHON_RUNTIME_ID: ${{ steps.setup-uv.outputs.python-runtime-id }}

  test-activate-environment-no-project:
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-        with:
-          persist-credentials: false
      - name: Create incompatible pyproject.toml
        run: |
          cat > pyproject.toml <<'EOF'
@@ -476,7 +474,7 @@ jobs:
        shell: bash
      - name: Install latest version with no-project
        id: setup-uv
-        uses: ./
+        uses: $/
        with:
          python-version: 3.13.1t
          activate-environment: true
@@ -506,7 +504,7 @@ jobs:
        with:
          persist-credentials: false
      - name: Install latest version
-        uses: ./
+        uses: $/
        with:
          enable-cache: true
      - run: uv sync
@@ -521,7 +519,7 @@ jobs:
          persist-credentials: false
      - name: Install latest version
        id: setup-uv
-        uses: ./
+        uses: $/
        with:
          enable-cache: true
      - name: Verify cache key contains alpine
@@ -546,8 +544,6 @@ jobs:
            expected-os: "ubuntu-22.04"
          - os: ubuntu-24.04
            expected-os: "ubuntu-24.04"
-          - os: macos-14
-            expected-os: "macos-14"
          - os: macos-15
            expected-os: "macos-15"
          - os: windows-2022
@@ -555,12 +551,9 @@ jobs:
          - os: windows-2025
            expected-os: "windows-2025"
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-        with:
-          persist-credentials: false
      - name: Setup uv
        id: setup-uv
-        uses: ./
+        uses: $/
        with:
          enable-cache: true
      - name: Verify cache key contains OS version
@@ -585,7 +578,7 @@ jobs:
        with:
          persist-credentials: false
      - name: Setup with cache
-        uses: ./
+        uses: $/
        with:
          enable-cache: ${{ matrix.enable-cache }}
          cache-suffix: ${{ github.run_id }}-${{ github.run_attempt }}-test-setup-cache-${{ matrix.os }}-${{ matrix.enable-cache }}
@@ -605,7 +598,7 @@ jobs:
          persist-credentials: false
      - name: Restore with cache
        id: restore
-        uses: ./
+        uses: $/
        with:
          enable-cache: ${{ matrix.enable-cache }}
          cache-suffix: ${{ github.run_id }}-${{ github.run_attempt }}-test-setup-cache-${{ matrix.os }}-${{ matrix.enable-cache }}
@@ -638,7 +631,7 @@ jobs:
        with:
          persist-credentials: false
      - name: Setup with cache
-        uses: ./
+        uses: $/
        with:
          enable-cache: true
          cache-suffix: ${{ github.run_id }}-${{ github.run_attempt }}-test-setup-cache-requirements-txt
@@ -655,7 +648,7 @@ jobs:
          persist-credentials: false
      - name: Restore with cache
        id: restore
-        uses: ./
+        uses: $/
        with:
          enable-cache: true
          cache-suffix: ${{ github.run_id }}-${{ github.run_attempt }}-test-setup-cache-requirements-txt
@@ -678,7 +671,7 @@ jobs:
        with:
          persist-credentials: false
      - name: Setup with cache
-        uses: ./
+        uses: $/
        with:
          enable-cache: true
          cache-dependency-glob: |
@@ -700,7 +693,7 @@ jobs:
          echo 'dev-dependencies = []' >> __tests__/fixtures/uv-project/pyproject.toml
      - name: Restore with cache
        id: restore
-        uses: ./
+        uses: $/
        with:
          enable-cache: true
          cache-dependency-glob: |
@@ -723,7 +716,7 @@ jobs:
        with:
          persist-credentials: false
      - name: Setup with cache
-        uses: ./
+        uses: $/
        with:
          enable-cache: true
          save-cache: false
@@ -740,7 +733,7 @@ jobs:
          persist-credentials: false
      - name: Restore with cache
        id: restore
-        uses: ./
+        uses: $/
        with:
          enable-cache: true
          cache-suffix: ${{ github.run_id }}-${{ github.run_attempt }}-test-setup-cache-save-cache-false
@@ -759,7 +752,7 @@ jobs:
        with:
          persist-credentials: false
      - name: Setup with cache
-        uses: ./
+        uses: $/
        with:
          enable-cache: true
          cache-suffix: ${{ github.run_id }}-${{ github.run_attempt }}-test-setup-cache-restore-cache-false
@@ -775,7 +768,7 @@ jobs:
          persist-credentials: false
      - name: Restore with cache
        id: restore
-        uses: ./
+        uses: $/
        with:
          enable-cache: true
          restore-cache: false
@@ -798,11 +791,8 @@ jobs:
            expected-cache-dir: "D:\\a\\_temp\\setup-uv-cache"
    runs-on: ${{ matrix.inputs.os }}
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-        with:
-          persist-credentials: false
      - name: Setup with cache
-        uses: ./
+        uses: $/
        with:
          enable-cache: true
          cache-suffix: ${{ github.run_id }}-${{ github.run_attempt }}-test-cache-local
@@ -816,11 +806,8 @@ jobs:
  test-cache-local-cache-disabled:
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-        with:
-          persist-credentials: false
      - name: Setup without cache
-        uses: ./
+        uses: $/
        with:
          enable-cache: false

@@ -835,11 +822,8 @@ jobs:
  test-cache-local-cache-disabled-but-explicit-path:
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-        with:
-          persist-credentials: false
      - name: Setup without cache
-        uses: ./
+        uses: $/
        with:
          enable-cache: false
          cache-local-path: /tmp/uv-cache-disabled
@@ -861,7 +845,7 @@ jobs:
      - name: Fake pyproject.toml at root
        run: cp __tests__/fixtures/old-python-constraint-project/pyproject.toml pyproject.toml
      - name: Setup with cache
-        uses: ./
+        uses: $/
        with:
          enable-cache: true
      - run: uv sync
@@ -874,7 +858,7 @@ jobs:
        with:
          persist-credentials: false
      - name: Install from custom manifest file
-        uses: ./
+        uses: $/
        with:
          manifest-file: "https://raw.githubusercontent.com/astral-sh/setup-uv/${{ github.ref }}/__tests__/download/custom-manifest.ndjson"
      - run: uv sync
@@ -889,12 +873,9 @@ jobs:
  test-download-from-astral-mirror-false:
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-        with:
-          persist-credentials: false
      - name: Install with download-from-astral-mirror disabled
        id: setup-uv
-        uses: ./
+        uses: $/
        with:
          download-from-astral-mirror: false
      - name: Verify uv is installed
@@ -903,14 +884,11 @@ jobs:
  test-absolute-path:
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-        with:
-          persist-credentials: false
      - name: Create requirements.txt
        run: echo "uv==0.6.17" > /tmp/setup-uv-requirements.txt
      - name: Install from requirements file
        id: setup-uv
-        uses: ./
+        uses: $/
        with:
          version-file: "/tmp/setup-uv-requirements.txt"
      - name: Correct version gets installed
@@ -923,16 +901,13 @@ jobs:
  test-relative-path:
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-        with:
-          persist-credentials: false
      - name: mkdir
        run: mkdir -p /tmp/setup-uv-test-relative-path
      - name: Create requirements.txt
        run: echo "uv==0.6.17" > /tmp/setup-uv-test-relative-path/setup-uv-requirements.txt
      - name: Install from requirements file
        id: setup-uv
-        uses: ./
+        uses: $/
        with:
          version-file: "./setup-uv-requirements.txt"
          working-directory: "/tmp/setup-uv-test-relative-path"
@@ -951,7 +926,7 @@ jobs:
        with:
          persist-credentials: false
      - name: Setup uv
-        uses: ./
+        uses: $/
        with:
          cache-suffix: ${{ github.run_id }}-${{ github.run_attempt }}-test-cache-prune-force
      - name: Create long running python script
@@ -974,7 +949,7 @@ jobs:
            exit 1
          fi
      - name: Setup uv
-        uses: ./
+        uses: $/
        with:
          working-directory: __tests__/fixtures/cache-dir-defined-project
      - run: uv sync
@@ -995,7 +970,7 @@ jobs:
        with:
          persist-credentials: false
      - name: Setup uv with cache and python cache enabled
-        uses: ./
+        uses: $/
        with:
          enable-cache: true
          cache-python: true
@@ -1022,7 +997,7 @@ jobs:
            exit 1
          fi
      - name: Setup uv with cache
-        uses: ./
+        uses: $/
        with:
          enable-cache: true
          cache-python: true
@@ -1050,7 +1025,7 @@ jobs:
          fi
      - name: Restore with cache
        id: restore
-        uses: ./
+        uses: $/
        with:
          enable-cache: true
          cache-python: true
@@ -1081,12 +1056,9 @@ jobs:
            expected-python-dir: "D:\\a\\_temp\\uv-python-dir"
    runs-on: ${{ matrix.inputs.os }}
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-        with:
-          persist-credentials: false
      - name: Install latest version
        id: setup-uv
-        uses: ./
+        uses: $/
      - name: Check Python dir is expected dir
        run: |
          if [ "$UV_PYTHON_INSTALL_DIR" != "${{ matrix.inputs.expected-python-dir }}" ]; then
@@ -1097,21 +1069,6 @@ jobs:
      - name: Install python works
        run: uv python install

-  test-act:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-        with:
-          persist-credentials: false
-      - name: Install act
-        run: gh extension install https://github.com/nektos/gh-act
-        env:
-          GH_TOKEN: ${{ github.token }}
-      - name: Run test-uvx with act
-        run: gh act -j test-uvx -P ubuntu-latest=catthehacker/ubuntu:act-latest
-        env:
-          GH_TOKEN: ${{ github.token }}
-
  test-workflow-run:
    runs-on: ubuntu-latest
    steps:
@@ -1187,7 +1144,6 @@ jobs:
      - test-cache-python-installs
      - test-restore-python-installs
      - test-python-install-dir
-      - test-act
      - test-workflow-run
      - validate-typings
    if: always()
@@ -60,20 +60,8 @@ jobs:
          else
              echo "changes-exist=false" >> "$GITHUB_OUTPUT"
          fi
-      - name: Commit and push changes
-        if: ${{ steps.changes-exist.outputs.changes-exist == 'true' }}
-        id: commit-and-push
-        continue-on-error: true
-        run: |
-          git config user.name "$GITHUB_ACTOR"
-          git config user.email "$GITHUB_ACTOR@users.noreply.github.com"
-          git add .
-          git commit -m "docs: update version references to $NEW_VERSION"
-          git push origin HEAD:refs/heads/main
-        env:
-          NEW_VERSION: ${{ steps.tag-info.outputs.tag }}
      - name: Create Pull Request
-        if: ${{ steps.changes-exist.outputs.changes-exist == 'true' && steps.commit-and-push.outcome != 'success' }}
+        if: ${{ steps.changes-exist.outputs.changes-exist == 'true' }}
        uses: peter-evans/create-pull-request@5f6978faf089d4d20b00c7766989d076bb2fc7f1 # v8.1.1
        with:
          commit-message: "docs: update version references to ${{ steps.tag-info.outputs.tag }}"
@@ -26,7 +26,7 @@ jobs:
        id: update-known-checksums
        run:
          node dist/update-known-checksums/index.cjs
-          src/download/checksum/known-checksums.ts
+          src/download/checksum/known-checksums.json
      - name: Check for changes
        id: changes-exist
        run: |
@@ -38,22 +38,12 @@ jobs:
          fi
      - name: Compile changes
        if: ${{ steps.changes-exist.outputs.changes-exist == 'true' }}
-        run: npm ci --ignore-scripts && npm run all
-      - name: Commit and push changes
-        if: ${{ steps.changes-exist.outputs.changes-exist == 'true' }}
-        id: commit-and-push
-        continue-on-error: true
        run: |
-          git config user.name "$GITHUB_ACTOR"
-          git config user.email "$GITHUB_ACTOR@users.noreply.github.com"
-          git add .
-          git commit -m "chore: update known checksums for $LATEST_VERSION"
-          git push origin HEAD:refs/heads/main
-        env:
-          LATEST_VERSION: ${{ steps.update-known-checksums.outputs.latest-version }}
-
+          npm ci --ignore-scripts
+          npm audit signatures
+          npm run all
      - name: Create Pull Request
-        if: ${{ steps.changes-exist.outputs.changes-exist == 'true' && steps.commit-and-push.outcome != 'success' }}
+        if: ${{ steps.changes-exist.outputs.changes-exist == 'true' }}
        uses: peter-evans/create-pull-request@5f6978faf089d4d20b00c7766989d076bb2fc7f1 # v8.1.1
        with:
          commit-message: "chore: update known checksums"
@@ -0,0 +1,3 @@
+engine-strict = true
+ignore-scripts = true
+min-release-age = 7
@@ -1 +1 @@
-24
+24.19.0
@@ -15,6 +15,7 @@ Set up your GitHub Actions workflow with a specific version of [uv](https://docs
  - [Inputs](#inputs)
  - [Outputs](#outputs)
  - [Python version](#python-version)
+  - [Python architecture](#python-architecture)
  - [Working directory](#working-directory)
 - [Advanced Configuration](#advanced-configuration)
 - [How it works](#how-it-works)
@@ -26,7 +27,7 @@ Set up your GitHub Actions workflow with a specific version of [uv](https://docs

 ```yaml
 - name: Install the latest version of uv
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
 ```

 If you do not specify a version, this action will look for a [required-version](https://docs.astral.sh/uv/reference/settings/#required-version)
@@ -42,7 +43,7 @@ Have a look under [Advanced Configuration](#advanced-configuration) for detailed

 ```yaml
 - name: Install uv with all available options
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    # The version of uv to install, e.g., "0.5.0", "latest", or "latest-known" (default: searches for version in config files, then latest)
    version: ""
@@ -56,6 +57,9 @@ Have a look under [Advanced Configuration](#advanced-configuration) for detailed
    # The version of Python to set UV_PYTHON to (overrides the Python version from .tool-versions)
    python-version: ""

+    # The Python architecture to set UV_PYTHON_ARCH to, e.g., x86_64 or aarch64
+    python-arch: ""
+
    # Use uv venv to activate a venv ready to be used by later steps
    activate-environment: "false"

@@ -77,7 +81,7 @@ Have a look under [Advanced Configuration](#advanced-configuration) for detailed
    # Enable the GitHub Actions cache for uv: true, false, or auto (enabled on GitHub-hosted runners except for release, tag push, pull_request_target, and workflow_run events; disabled on self-hosted runners)
    enable-cache: "auto"

-    # Glob pattern to match files relative to the repository root to control the cache
+    # Glob pattern to match files relative to the working directory to control the cache
    cache-dependency-glob: |
      **/*requirements*.txt
      **/*requirements*.in
@@ -90,8 +94,8 @@ Have a look under [Advanced Configuration](#advanced-configuration) for detailed
    # Whether to restore the cache if found
    restore-cache: "true"

-    # Whether to save the cache after the run
-    save-cache: "true"
+    # Whether to save the cache after the run: true, false, or auto (disabled for merge_group events)
+    save-cache: "auto"

    # Suffix for the cache key
    cache-suffix: ""
@@ -138,6 +142,7 @@ Have a look under [Advanced Configuration](#advanced-configuration) for detailed
 - `cache-hit`: A boolean value to indicate a cache entry was found.
 - `venv`: Path to the activated venv if activate-environment is true.
 - `python-version`: The Python version that was set.
+- `python-runtime-id`: An opaque identifier reported by uv for the activated venv's Python runtime. Empty when `activate-environment` is false.
 - `python-cache-hit`: A boolean value to indicate the Python cache entry was found.

 ### Python version
@@ -156,7 +161,7 @@ python 3.13
 ```

 ```yaml
- uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+- uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    version-file: ".tool-versions"
 ```
@@ -167,7 +172,7 @@ a warning.

 ```yaml
 - name: Install the latest version of uv and set the python version to 3.13t
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    python-version: 3.13t
 - run: uv pip install --python=3.13t pip
@@ -185,13 +190,32 @@ jobs:
    steps:
      - uses: actions/checkout@v5
      - name: Install the latest version of uv and set the python version
-        uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+        uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
        with:
          python-version: ${{ matrix.python-version }}
      - name: Test with python ${{ matrix.python-version }}
        run: uv run --frozen pytest
 ```

+### Python architecture
+
+Use `python-arch` to set `UV_PYTHON_ARCH` for the rest of the job. This selects the Python
+architecture independently of the version, including versions requested by `.python-version`.
+An explicit architecture or interpreter path in a Python request takes precedence.
+
+```yaml
+- uses: astral-sh/setup-uv@main
+  with:
+    python-version: "3.14"
+    python-arch: x86_64
+- run: uv run --frozen pytest
+```
+
+The input overrides an existing `UV_PYTHON_ARCH` value. When it is omitted, the action respects
+`UV_PYTHON_ARCH` from the environment. Both forms require a uv version that supports the variable;
+the action reports an error if the installed version does not support it. The selected architecture
+is included in the [cache key](docs/caching.md#cache-key).
+
 ### Working directory

 You can set the working directory with the `working-directory` input.
@@ -202,7 +226,7 @@ It also controls where [the venv gets created](#activate-environment), unless `v

 ```yaml
 - name: Install uv based on the config files in the working-directory
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    working-directory: my/subproject/dir
 ```
@@ -244,7 +268,7 @@ For example:
 - name: Checkout the repository
  uses: actions/checkout@main
 - name: Install the latest version of uv
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    enable-cache: true
 - name: Test
@@ -256,7 +280,7 @@ To install a specific version of Python, use

 ```yaml
 - name: Install the latest version of uv
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    enable-cache: true
 - name: Install Python 3.12
@@ -275,7 +299,7 @@ output:
  uses: actions/checkout@main
 - name: Install the default version of uv
  id: setup-uv
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
 - name: Print the installed version
  run: echo "Installed uv version is ${{ steps.setup-uv.outputs.uv-version }}"
 ```
@@ -4,6 +4,9 @@ import { createSetupInputs } from "../helpers/setup-inputs";
 const mockRestoreCache = jest.fn();
 const mockSaveState = jest.fn();
 const mockSetOutput = jest.fn();
+const mockGetArch = jest.fn(() => "x86_64");
+const mockGetOSNameVersion = jest.fn(() => "ubuntu-24.04");
+const mockGetPlatform = jest.fn(async () => "unknown-linux-gnu");

 jest.unstable_mockModule("@actions/cache", () => ({
  restoreCache: mockRestoreCache,
@@ -24,9 +27,9 @@ jest.unstable_mockModule("../../src/utils/logging", () => ({
 }));

 jest.unstable_mockModule("../../src/utils/platforms", () => ({
-  getArch: jest.fn(() => "x86_64"),
-  getOSNameVersion: jest.fn(() => "ubuntu-24.04"),
-  getPlatform: jest.fn(async () => "unknown-linux-gnu"),
+  getArch: mockGetArch,
+  getOSNameVersion: mockGetOSNameVersion,
+  getPlatform: mockGetPlatform,
 }));

 const { restoreCache } = await import("../../src/cache/restore-cache");
@@ -39,6 +42,9 @@ function cacheKeyOutput(): string {

 beforeEach(() => {
  jest.clearAllMocks();
+  mockGetArch.mockReturnValue("x86_64");
+  mockGetOSNameVersion.mockReturnValue("ubuntu-24.04");
+  mockGetPlatform.mockResolvedValue("unknown-linux-gnu");
 });

 describe("restoreCache", () => {
@@ -71,4 +77,39 @@ describe("restoreCache", () => {
      "setup-uv-2-x86_64-unknown-linux-gnu-ubuntu-24.04-3.11-dependencyhash-tests-3.11",
    );
  });
+
+  it("includes the resolved Python architecture in the cache key", async () => {
+    const inputs = createSetupInputs({ pythonArch: "aarch64" });
+
+    await restoreCache(inputs, "3.14");
+
+    expect(cacheKeyOutput()).toContain("-3.14-python-aarch64-");
+  });
+
+  it.each(["aarch64", "x86_64"])(
+    "separates %s Python caches on a Windows ARM64 runner",
+    async (pythonArch) => {
+      mockGetArch.mockReturnValue("aarch64");
+      mockGetOSNameVersion.mockReturnValue("windows-11");
+      mockGetPlatform.mockResolvedValue("pc-windows-msvc");
+      const inputs = createSetupInputs({
+        cachePython: true,
+        pythonArch,
+        restoreCache: true,
+      });
+
+      await restoreCache(inputs, "3.14");
+
+      const cacheKey = `setup-uv-2-aarch64-pc-windows-msvc-windows-11-3.14-python-${pythonArch}-py-dependencyhash`;
+      expect(cacheKeyOutput()).toBe(cacheKey);
+      expect(mockRestoreCache).toHaveBeenCalledWith(
+        [inputs.cacheLocalPath?.path],
+        cacheKey,
+      );
+      expect(mockRestoreCache).toHaveBeenCalledWith(
+        [inputs.pythonDir],
+        `${cacheKey}-python`,
+      );
+    },
+  );
 });
@@ -0,0 +1,33 @@
+import { readFileSync } from "node:fs";
+import { runInNewContext } from "node:vm";
+import { expect, it } from "@jest/globals";
+
+const saveCacheBundle = readFileSync(
+  new URL("../../dist/save-cache/index.cjs", import.meta.url),
+  "utf8",
+);
+
+function bundledErrorClass(name: string): new (message: string) => Error {
+  const start = saveCacheBundle.indexOf(`var ${name} = class`);
+  expect(start).toBeGreaterThanOrEqual(0);
+
+  const end = saveCacheBundle.indexOf("\n};", start);
+  expect(end).toBeGreaterThan(start);
+
+  const declaration = saveCacheBundle.slice(start, end + 3);
+  return runInNewContext(`${declaration}; ${name}`, {
+    __name: (target: object, value: string) =>
+      Object.defineProperty(target, "name", { configurable: true, value }),
+  }) as new (
+    message: string,
+  ) => Error;
+}
+
+it.each(["ValidationError", "ReserveCacheError", "FinalizeCacheError"])(
+  "preserves the %s name in the save-cache bundle",
+  (name) => {
+    const ErrorClass = bundledErrorClass(name);
+
+    expect(new ErrorClass("test").name).toBe(ErrorClass.name);
+  },
+);
@@ -26,9 +26,49 @@ test("provided checksum beats known checksums", async () => {
    "x86_64",
    "unknown-linux-gnu",
    "0.3.0",
+    "incorrect-manifest-checksum",
  );
 });

+test("known checksums beat manifest checksums", async () => {
+  await expect(
+    validateChecksum(
+      undefined,
+      filePath,
+      "x86_64",
+      "unknown-linux-gnu",
+      "0.3.0",
+      validChecksum,
+    ),
+  ).rejects.toThrow("did not match");
+});
+
+test("manifest checksums are used when no known checksum exists", async () => {
+  await expect(
+    validateChecksum(
+      undefined,
+      filePath,
+      "aarch64",
+      "pc-windows-msvc",
+      "1.2.3",
+      "incorrect-manifest-checksum",
+    ),
+  ).rejects.toThrow("did not match");
+});
+
+test("empty manifest checksums are rejected", async () => {
+  await expect(
+    validateChecksum(
+      undefined,
+      filePath,
+      "aarch64",
+      "pc-windows-msvc",
+      "1.2.3",
+      "",
+    ),
+  ).rejects.toThrow("No checksum found");
+});
+
 type KnownVersionFixture = { version: string; known: boolean };

 it.each<KnownVersionFixture>([
@@ -0,0 +1,27 @@
+import { promises as fs } from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { expect, test } from "@jest/globals";
+import { updateChecksums } from "../../../src/download/checksum/update-known-checksums";
+
+test("serializes checksum entries as JSON data", async () => {
+  const tempDirectory = await fs.mkdtemp(
+    path.join(os.tmpdir(), "setup-uv-checksums-test-"),
+  );
+  const outputPath = path.join(tempDirectory, "known-checksums.json");
+  const key = 'platform-1.0.0"\n};\nglobalThis.compromised = true;';
+  const checksum = 'checksum"\\\nvalue';
+
+  try {
+    await updateChecksums(outputPath, [
+      { checksum, key },
+      { checksum: "duplicate", key },
+    ]);
+
+    const content = await fs.readFile(outputPath, "utf8");
+    expect(JSON.parse(content)).toEqual({ [key]: checksum });
+    expect(content.endsWith("\n")).toBe(true);
+  } finally {
+    await fs.rm(tempDirectory, { force: true, recursive: true });
+  }
+});
@@ -227,10 +227,10 @@ describe("download-version", () => {
      expect(mockValidateChecksum).not.toHaveBeenCalled();
    });

-    it("uses built-in checksums for default manifest downloads", async () => {
+    it("uses the default manifest checksum as a fallback", async () => {
      mockGetArtifact.mockResolvedValue({
        archiveFormat: "tar.gz",
-        checksum: "manifest-checksum-that-should-be-ignored",
+        checksum: "manifest-checksum",
        downloadUrl: "https://example.com/uv.tar.gz",
      });

@@ -248,6 +248,7 @@ describe("download-version", () => {
        "x86_64",
        "unknown-linux-gnu",
        "0.9.26",
+        "manifest-checksum",
      );
    });

@@ -400,6 +401,7 @@ describe("download-version", () => {
        "x86_64",
        "unknown-linux-gnu",
        "0.9.26",
+        "manifest-checksum",
      );
    });

@@ -425,6 +427,7 @@ describe("download-version", () => {
        "x86_64",
        "unknown-linux-gnu",
        "0.9.26",
+        "manifest-checksum",
      );
    });

@@ -16,11 +16,13 @@ export function createSetupInputs(
    checksum: "",
    downloadFromAstralMirror: false,
    enableCache: true,
+    exportPythonArch: false,
    githubToken: "",
    ignoreEmptyWorkdir: false,
    ignoreNothingToCache: false,
    noProject: false,
    pruneCache: false,
+    pythonArch: "",
    pythonDir: "/tmp/uv-python-dir",
    pythonVersion: "",
    quiet: false,
@@ -19,6 +19,7 @@ const ORIGINAL_RUNNER_ENVIRONMENT = process.env.RUNNER_ENVIRONMENT;
 const ORIGINAL_RUNNER_TEMP = process.env.RUNNER_TEMP;
 const ORIGINAL_UV_CACHE_DIR = process.env.UV_CACHE_DIR;
 const ORIGINAL_UV_PYTHON = process.env.UV_PYTHON;
+const ORIGINAL_UV_PYTHON_ARCH = process.env.UV_PYTHON_ARCH;
 const ORIGINAL_UV_PYTHON_INSTALL_DIR = process.env.UV_PYTHON_INSTALL_DIR;

 const mockDebug = jest.fn();
@@ -62,6 +63,7 @@ function resetEnvironment(): void {
  delete process.env.RUNNER_TEMP;
  delete process.env.UV_CACHE_DIR;
  delete process.env.UV_PYTHON;
+  delete process.env.UV_PYTHON_ARCH;
  delete process.env.UV_PYTHON_INSTALL_DIR;
 }

@@ -77,6 +79,11 @@ function restoreEnvironment(): void {
  process.env.RUNNER_TEMP = ORIGINAL_RUNNER_TEMP;
  process.env.UV_CACHE_DIR = ORIGINAL_UV_CACHE_DIR;
  process.env.UV_PYTHON = ORIGINAL_UV_PYTHON;
+  if (ORIGINAL_UV_PYTHON_ARCH === undefined) {
+    delete process.env.UV_PYTHON_ARCH;
+  } else {
+    process.env.UV_PYTHON_ARCH = ORIGINAL_UV_PYTHON_ARCH;
+  }
  process.env.UV_PYTHON_INSTALL_DIR = ORIGINAL_UV_PYTHON_INSTALL_DIR;
 }

@@ -98,6 +105,8 @@ describe("loadInputs", () => {
      source: CacheLocalSource.Default,
    });
    expect(inputs.pythonDir).toBe("/runner-temp/uv-python-dir");
+    expect(inputs.pythonArch).toBe("");
+    expect(inputs.exportPythonArch).toBe(false);
    expect(inputs.venvPath).toBe("/workspace/.venv");
    expect(inputs.manifestFile).toBeUndefined();
    expect(inputs.resolutionStrategy).toBe("highest");
@@ -149,6 +158,28 @@ describe("loadInputs", () => {
    expect(inputs.pythonVersion).toBe("");
  });

+  it("prefers the python-arch input over UV_PYTHON_ARCH", () => {
+    mockInputs["working-directory"] = "/workspace";
+    mockInputs["python-arch"] = "x86_64";
+    process.env.UV_PYTHON_ARCH = "aarch64";
+
+    const inputs = loadInputs();
+    expect(inputs.pythonArch).toBe("x86_64");
+    expect(inputs.exportPythonArch).toBe(true);
+  });
+
+  it.each(["aarch64", "x86_64_v3", ""])(
+    "uses UV_PYTHON_ARCH when python-arch is omitted: %s",
+    (pythonArch) => {
+      mockInputs["working-directory"] = "/workspace";
+      process.env.UV_PYTHON_ARCH = pythonArch;
+
+      const inputs = loadInputs();
+      expect(inputs.pythonArch).toBe(pythonArch);
+      expect(inputs.exportPythonArch).toBe(false);
+    },
+  );
+
  it.each(["pull_request_target", "workflow_run", "release"])(
    "disables automatic caching for the %s event",
    (eventName) => {
@@ -206,6 +237,51 @@ describe("loadInputs", () => {
    expect(inputs.enableCache).toBe(true);
  });

+  it("restores but does not save cache automatically for merge groups", () => {
+    mockInputs["working-directory"] = "/workspace";
+    mockInputs["enable-cache"] = "auto";
+    mockInputs["restore-cache"] = "true";
+    mockInputs["save-cache"] = "auto";
+    process.env.RUNNER_ENVIRONMENT = "github-hosted";
+    process.env.RUNNER_TEMP = "/runner-temp";
+    process.env.GITHUB_EVENT_NAME = "merge_group";
+
+    const inputs = loadInputs();
+
+    expect(inputs.enableCache).toBe(true);
+    expect(inputs.restoreCache).toBe(true);
+    expect(inputs.saveCache).toBe(false);
+    expect(mockInfo).toHaveBeenCalledWith(
+      "Cache saving is disabled for the merge_group event",
+    );
+  });
+
+  it.each([
+    ["true", true],
+    ["false", false],
+  ])("honors save-cache %s for merge groups", (saveCacheInput, expected) => {
+    mockInputs["working-directory"] = "/workspace";
+    mockInputs["save-cache"] = saveCacheInput;
+    process.env.GITHUB_EVENT_NAME = "merge_group";
+
+    const inputs = loadInputs();
+
+    expect(inputs.saveCache).toBe(expected);
+    expect(mockInfo).not.toHaveBeenCalledWith(
+      "Cache saving is disabled for the merge_group event",
+    );
+  });
+
+  it("automatically saves cache for other events", () => {
+    mockInputs["working-directory"] = "/workspace";
+    mockInputs["save-cache"] = "auto";
+    process.env.GITHUB_EVENT_NAME = "push";
+
+    const inputs = loadInputs();
+
+    expect(inputs.saveCache).toBe(true);
+  });
+
  it("uses cache-dir from pyproject.toml when present", () => {
    mockInputs["working-directory"] = createTempProject({
      "pyproject.toml": `[project]
@@ -0,0 +1,152 @@
+import { promisify } from "node:util";
+import {
+  afterEach,
+  beforeEach,
+  describe,
+  expect,
+  it,
+  jest,
+} from "@jest/globals";
+
+const ORIGINAL_UV_PYTHON_ARCH = process.env.UV_PYTHON_ARCH;
+
+const mockExecFile =
+  jest.fn<
+    (...args: unknown[]) => Promise<{
+      stdout: string;
+      stderr: string;
+    }>
+  >();
+const mockExportVariable = jest.fn();
+
+jest.unstable_mockModule("node:child_process", () => ({
+  execFile: Object.assign(mockExecFile, { [promisify.custom]: mockExecFile }),
+}));
+jest.unstable_mockModule("@actions/core", () => ({
+  exportVariable: mockExportVariable,
+}));
+jest.unstable_mockModule("../../src/utils/logging", () => ({
+  info: jest.fn(),
+}));
+
+const { setupPythonArch } = await import("../../src/utils/python-arch");
+
+const supportedProbe = Object.assign(new Error("uv exited with code 2"), {
+  code: 2,
+  stderr:
+    "error: Failed to parse environment variable `UV_PYTHON_ARCH` with invalid value `setup-uv-probe`: Unknown architecture: setup-uv-probe\n",
+});
+const success = { stderr: "", stdout: "/cache\n" };
+
+beforeEach(() => {
+  delete process.env.UV_PYTHON_ARCH;
+  jest.clearAllMocks();
+  mockExecFile
+    .mockReset()
+    .mockRejectedValueOnce(supportedProbe)
+    .mockResolvedValueOnce(success);
+});
+
+afterEach(() => {
+  if (ORIGINAL_UV_PYTHON_ARCH === undefined) {
+    delete process.env.UV_PYTHON_ARCH;
+  } else {
+    process.env.UV_PYTHON_ARCH = ORIGINAL_UV_PYTHON_ARCH;
+  }
+});
+
+describe("setupPythonArch", () => {
+  it("leaves Python selection alone without an architecture", async () => {
+    await setupPythonArch("/tools/uv", "", false);
+
+    expect(mockExecFile).not.toHaveBeenCalled();
+    expect(mockExportVariable).not.toHaveBeenCalled();
+  });
+
+  it("validates a resolved environment architecture without exporting it", async () => {
+    process.env.UV_PYTHON_ARCH = "aarch64";
+
+    await setupPythonArch("/tools/uv", "aarch64", false);
+
+    expect(mockExecFile).toHaveBeenNthCalledWith(
+      2,
+      "/tools/uv",
+      ["--no-config", "cache", "dir"],
+      expect.objectContaining({
+        env: expect.objectContaining({ UV_PYTHON_ARCH: "aarch64" }),
+      }),
+    );
+    expect(mockExportVariable).not.toHaveBeenCalled();
+    expect(process.env.UV_PYTHON_ARCH).toBe("aarch64");
+  });
+
+  it.each(["/runner temp/uv", "C:\\runner temp\\uv.exe"])(
+    "validates and exports the architecture using the installed uv: %s",
+    async (uvPath) => {
+      await setupPythonArch(uvPath, "x86_64", true);
+
+      expect(mockExecFile).toHaveBeenNthCalledWith(
+        1,
+        uvPath,
+        ["--no-config", "cache", "dir"],
+        expect.objectContaining({
+          encoding: "utf8",
+          env: expect.objectContaining({ UV_PYTHON_ARCH: "setup-uv-probe" }),
+        }),
+      );
+      expect(mockExecFile).toHaveBeenNthCalledWith(
+        2,
+        uvPath,
+        ["--no-config", "cache", "dir"],
+        expect.objectContaining({
+          env: expect.objectContaining({ UV_PYTHON_ARCH: "x86_64" }),
+        }),
+      );
+      expect(mockExportVariable).toHaveBeenCalledWith(
+        "UV_PYTHON_ARCH",
+        "x86_64",
+      );
+    },
+  );
+
+  it("rejects uv versions that ignore UV_PYTHON_ARCH", async () => {
+    mockExecFile.mockReset().mockResolvedValue(success);
+
+    await expect(setupPythonArch("/tools/uv", "x86_64", true)).rejects.toThrow(
+      "The installed version of uv does not support UV_PYTHON_ARCH",
+    );
+    expect(mockExecFile).toHaveBeenCalledTimes(1);
+    expect(mockExportVariable).not.toHaveBeenCalled();
+  });
+
+  it("reports unexpected probe failures", async () => {
+    mockExecFile.mockReset().mockRejectedValue(
+      Object.assign(new Error("uv exited with code 2"), {
+        code: 2,
+        stderr: "error: unrelated configuration error\n",
+      }),
+    );
+
+    await expect(setupPythonArch("/tools/uv", "x86_64", true)).rejects.toThrow(
+      "Failed to check uv's support for UV_PYTHON_ARCH: error: unrelated configuration error",
+    );
+    expect(mockExportVariable).not.toHaveBeenCalled();
+  });
+
+  it("reports invalid architectures before exporting them", async () => {
+    mockExecFile
+      .mockReset()
+      .mockRejectedValueOnce(supportedProbe)
+      .mockRejectedValueOnce(
+        Object.assign(new Error("uv exited with code 2"), {
+          code: 2,
+          stderr: "error: Unknown architecture: invalid\n",
+        }),
+      );
+
+    await expect(setupPythonArch("/tools/uv", "invalid", true)).rejects.toThrow(
+      "Failed to set Python architecture to invalid: error: Unknown architecture: invalid",
+    );
+    expect(mockExportVariable).not.toHaveBeenCalled();
+  });
+});
@@ -0,0 +1,86 @@
+import { promisify } from "node:util";
+import { beforeEach, expect, it, jest } from "@jest/globals";
+import { createSetupInputs } from "../helpers/setup-inputs";
+
+const mockExecFile =
+  jest.fn<
+    (...args: unknown[]) => Promise<{ stdout: string; stderr: string }>
+  >();
+const inputs = createSetupInputs({
+  activateEnvironment: true,
+  pythonVersion: "3.15t",
+});
+
+jest.unstable_mockModule("node:child_process", () => ({
+  // execFile's custom promisifier returns both stdout and stderr.
+  execFile: Object.assign(mockExecFile, { [promisify.custom]: mockExecFile }),
+}));
+
+const { getPythonRuntimeId } = await import("../../src/utils/python-runtime");
+
+beforeEach(() => {
+  mockExecFile.mockReset();
+  mockExecFile.mockResolvedValue({
+    stderr: "",
+    stdout: '[{"key":"cpython-3.13.1-linux-x86_64-gnu"}]\r\n',
+  });
+});
+
+it("does not query uv without environment activation", async () => {
+  expect(
+    await getPythonRuntimeId({ ...inputs, activateEnvironment: false }),
+  ).toBe("");
+  expect(mockExecFile).not.toHaveBeenCalled();
+});
+
+it.each([
+  "cpython-3.13.1-linux-x86_64-gnu",
+  "cpython-3.15.0rc1+freethreaded-macos-aarch64-none",
+  "cpython-3.15.0rc2+freethreaded-windows-x86_64-none",
+  "pypy-3.11.15-linux-x86_64-gnu",
+])("returns uv's opaque runtime key unchanged: %s", async (key) => {
+  mockExecFile.mockResolvedValue({
+    stderr: "",
+    stdout: `${JSON.stringify([{ key }])}\r\n`,
+  });
+  expect(await getPythonRuntimeId(inputs)).toBe(key);
+});
+
+it.each(['/runner temp/a "quoted" venv', "C:\\runner temp\\custom venv"])(
+  "queries the exact venv directory: %s",
+  async (venvPath) => {
+    await getPythonRuntimeId({ ...inputs, venvPath });
+    expect(mockExecFile).toHaveBeenCalledWith(
+      "uv",
+      [
+        "python",
+        "list",
+        venvPath,
+        "--only-installed",
+        "--output-format",
+        "json",
+      ],
+      { encoding: "utf8" },
+    );
+  },
+);
+
+it.each([
+  new Error("uv failed"),
+  "not JSON",
+  "null",
+  "{}",
+  "[]",
+  '[{"key":""}]',
+  '[{"key":123}]',
+  '[{"key":"first"},{"key":"second"}]',
+])("rejects uv failure or invalid results: %s", async (result) => {
+  if (result instanceof Error) {
+    mockExecFile.mockRejectedValue(result);
+  } else {
+    mockExecFile.mockResolvedValue({ stderr: "", stdout: result });
+  }
+  await expect(getPythonRuntimeId(inputs)).rejects.toThrow(
+    "Failed to identify the activated environment's Python runtime:",
+  );
+});
@@ -7,6 +7,8 @@ inputs:
    type: string
  python-version:
    type: string
+  python-arch:
+    type: string
  activate-environment:
    type: boolean
  venv-path:
@@ -33,7 +35,11 @@ inputs:
  restore-cache:
    type: boolean
  save-cache:
-    type: boolean
+    type: enum
+    allowed-values:
+      - "true"
+      - "false"
+      - auto
  cache-suffix:
    type: string
  cache-local-path:
@@ -79,5 +85,7 @@ outputs:
    type: string
  python-version:
    type: string
+  python-runtime-id:
+    type: string
  python-cache-hit:
    type: boolean
@@ -12,6 +12,9 @@ inputs:
  python-version:
    description: "The version of Python to set UV_PYTHON to. Overrides the Python version from .tool-versions."
    required: false
+  python-arch:
+    description: "The Python architecture to set UV_PYTHON_ARCH to, e.g., x86_64 or aarch64. Overrides UV_PYTHON_ARCH."
+    required: false
  activate-environment:
    description: "Use uv venv to activate a venv ready to be used by later steps. "
    default: "false"
@@ -51,8 +54,8 @@ inputs:
    description: "Whether to restore the cache if found."
    default: "true"
  save-cache:
-    description: "Whether to save the cache after the run."
-    default: "true"
+    description: "Whether to save the cache after the run. 'auto' disables saving for merge_group events."
+    default: "auto"
  cache-suffix:
    description: "Suffix for the cache key"
    required: false
@@ -107,6 +110,8 @@ outputs:
    description: "Path to the activated venv if activate-environment is true"
  python-version:
    description: "The Python version that was set."
+  python-runtime-id:
+    description: "An opaque identifier reported by uv for the activated venv's Python runtime. Empty when activate-environment is false."
  python-cache-hit:
    description: "A boolean value to indicate the Python cache entry was found"
 runs:
@@ -1,5 +1,5 @@
 {
-  "$schema": "https://biomejs.dev/schemas/2.5.7/schema.json",
+  "$schema": "https://biomejs.dev/schemas/2.5.11/schema.json",
  "assist": {
    "actions": {
      "source": {
@@ -8542,7 +8542,7 @@ var require_proxy_agent = __commonJS({
        return this.#client.destroy(err);
      }
    };
-    var ProxyAgent3 = class extends DispatcherBase {
+    var ProxyAgent2 = class extends DispatcherBase {
      constructor(opts) {
        super();
        if (!opts || typeof opts === "object" && !(opts instanceof URL2) && !opts.uri) {
@@ -8683,7 +8683,7 @@ var require_proxy_agent = __commonJS({
        throw new InvalidArgumentError("Proxy-Authorization should be sent in ProxyAgent constructor");
      }
    }
-    module2.exports = ProxyAgent3;
+    module2.exports = ProxyAgent2;
  }
 });

@@ -8693,14 +8693,14 @@ var require_env_http_proxy_agent = __commonJS({
    "use strict";
    var DispatcherBase = require_dispatcher_base();
    var { kClose, kDestroy, kClosed, kDestroyed, kDispatch, kNoProxyAgent, kHttpProxyAgent, kHttpsProxyAgent } = require_symbols();
-    var ProxyAgent3 = require_proxy_agent();
+    var ProxyAgent2 = require_proxy_agent();
    var Agent = require_agent();
    var DEFAULT_PORTS = {
      "http:": 80,
      "https:": 443
    };
    var experimentalWarned = false;
-    var EnvHttpProxyAgent = class extends DispatcherBase {
+    var EnvHttpProxyAgent2 = class extends DispatcherBase {
      #noProxyValue = null;
      #noProxyEntries = null;
      #opts = null;
@@ -8717,13 +8717,13 @@ var require_env_http_proxy_agent = __commonJS({
        this[kNoProxyAgent] = new Agent(agentOpts);
        const HTTP_PROXY = httpProxy ?? process.env.http_proxy ?? process.env.HTTP_PROXY;
        if (HTTP_PROXY) {
-          this[kHttpProxyAgent] = new ProxyAgent3({ ...agentOpts, uri: HTTP_PROXY });
+          this[kHttpProxyAgent] = new ProxyAgent2({ ...agentOpts, uri: HTTP_PROXY });
        } else {
          this[kHttpProxyAgent] = this[kNoProxyAgent];
        }
        const HTTPS_PROXY = httpsProxy ?? process.env.https_proxy ?? process.env.HTTPS_PROXY;
        if (HTTPS_PROXY) {
-          this[kHttpsProxyAgent] = new ProxyAgent3({ ...agentOpts, uri: HTTPS_PROXY });
+          this[kHttpsProxyAgent] = new ProxyAgent2({ ...agentOpts, uri: HTTPS_PROXY });
        } else {
          this[kHttpsProxyAgent] = this[kHttpProxyAgent];
        }
@@ -8819,7 +8819,7 @@ var require_env_http_proxy_agent = __commonJS({
        return process.env.no_proxy ?? process.env.NO_PROXY ?? "";
      }
    };
-    module2.exports = EnvHttpProxyAgent;
+    module2.exports = EnvHttpProxyAgent2;
  }
 });

@@ -18454,8 +18454,8 @@ var require_undici = __commonJS({
    var Pool = require_pool();
    var BalancedPool = require_balanced_pool();
    var Agent = require_agent();
-    var ProxyAgent3 = require_proxy_agent();
-    var EnvHttpProxyAgent = require_env_http_proxy_agent();
+    var ProxyAgent2 = require_proxy_agent();
+    var EnvHttpProxyAgent2 = require_env_http_proxy_agent();
    var RetryAgent = require_retry_agent();
    var errors = require_errors();
    var util = require_util();
@@ -18477,8 +18477,8 @@ var require_undici = __commonJS({
    module2.exports.Pool = Pool;
    module2.exports.BalancedPool = BalancedPool;
    module2.exports.Agent = Agent;
-    module2.exports.ProxyAgent = ProxyAgent3;
-    module2.exports.EnvHttpProxyAgent = EnvHttpProxyAgent;
+    module2.exports.ProxyAgent = ProxyAgent2;
+    module2.exports.EnvHttpProxyAgent = EnvHttpProxyAgent2;
    module2.exports.RetryAgent = RetryAgent;
    module2.exports.RetryHandler = RetryHandler;
    module2.exports.DecoratorHandler = DecoratorHandler;
@@ -31050,7 +31050,7 @@ var require_proxy_agent2 = __commonJS({
        return this.#client.destroy(err);
      }
    };
-    var ProxyAgent3 = class extends DispatcherBase {
+    var ProxyAgent2 = class extends DispatcherBase {
      constructor(opts) {
        if (!opts || typeof opts === "object" && !(opts instanceof URL) && !opts.uri) {
          throw new InvalidArgumentError("Proxy uri is mandatory");
@@ -31249,7 +31249,7 @@ var require_proxy_agent2 = __commonJS({
    function throwProxyAuthError() {
      throw new InvalidArgumentError("Proxy-Authorization should be sent in ProxyAgent constructor");
    }
-    module2.exports = ProxyAgent3;
+    module2.exports = ProxyAgent2;
  }
 });

@@ -31259,13 +31259,13 @@ var require_env_http_proxy_agent2 = __commonJS({
    "use strict";
    var DispatcherBase = require_dispatcher_base2();
    var { kClose, kDestroy, kClosed, kDestroyed, kDispatch, kNoProxyAgent, kHttpProxyAgent, kHttpsProxyAgent } = require_symbols6();
-    var ProxyAgent3 = require_proxy_agent2();
+    var ProxyAgent2 = require_proxy_agent2();
    var Agent = require_agent2();
    var DEFAULT_PORTS = {
      "http:": 80,
      "https:": 443
    };
-    var EnvHttpProxyAgent = class extends DispatcherBase {
+    var EnvHttpProxyAgent2 = class extends DispatcherBase {
      #noProxyValue = null;
      #noProxyEntries = null;
      #opts = null;
@@ -31276,13 +31276,13 @@ var require_env_http_proxy_agent2 = __commonJS({
        this[kNoProxyAgent] = new Agent(agentOpts);
        const HTTP_PROXY = httpProxy ?? process.env.http_proxy ?? process.env.HTTP_PROXY;
        if (HTTP_PROXY) {
-          this[kHttpProxyAgent] = new ProxyAgent3({ ...agentOpts, uri: HTTP_PROXY });
+          this[kHttpProxyAgent] = new ProxyAgent2({ ...agentOpts, uri: HTTP_PROXY });
        } else {
          this[kHttpProxyAgent] = this[kNoProxyAgent];
        }
        const HTTPS_PROXY = httpsProxy ?? process.env.https_proxy ?? process.env.HTTPS_PROXY;
        if (HTTPS_PROXY) {
-          this[kHttpsProxyAgent] = new ProxyAgent3({ ...agentOpts, uri: HTTPS_PROXY });
+          this[kHttpsProxyAgent] = new ProxyAgent2({ ...agentOpts, uri: HTTPS_PROXY });
        } else {
          this[kHttpsProxyAgent] = this[kHttpProxyAgent];
        }
@@ -31383,7 +31383,7 @@ var require_env_http_proxy_agent2 = __commonJS({
        return process.env.no_proxy ?? process.env.NO_PROXY ?? "";
      }
    };
-    module2.exports = EnvHttpProxyAgent;
+    module2.exports = EnvHttpProxyAgent2;
  }
 });

@@ -46513,9 +46513,9 @@ var require_undici2 = __commonJS({
    var RoundRobinPool = require_round_robin_pool();
    var Agent = require_agent2();
    var Dispatcher1Wrapper = require_dispatcher1_wrapper();
-    var ProxyAgent3 = require_proxy_agent2();
+    var ProxyAgent2 = require_proxy_agent2();
    var Socks5ProxyAgent = require_socks5_proxy_agent();
-    var EnvHttpProxyAgent = require_env_http_proxy_agent2();
+    var EnvHttpProxyAgent2 = require_env_http_proxy_agent2();
    var RetryAgent = require_retry_agent2();
    var H2CClient = require_h2c_client();
    var errors = require_errors2();
@@ -46541,9 +46541,9 @@ var require_undici2 = __commonJS({
    module2.exports.RoundRobinPool = RoundRobinPool;
    module2.exports.Agent = Agent;
    module2.exports.Dispatcher1Wrapper = Dispatcher1Wrapper;
-    module2.exports.ProxyAgent = ProxyAgent3;
+    module2.exports.ProxyAgent = ProxyAgent2;
    module2.exports.Socks5ProxyAgent = Socks5ProxyAgent;
-    module2.exports.EnvHttpProxyAgent = EnvHttpProxyAgent;
+    module2.exports.EnvHttpProxyAgent = EnvHttpProxyAgent2;
    module2.exports.RetryAgent = RetryAgent;
    module2.exports.H2CClient = H2CClient;
    module2.exports.RetryHandler = RetryHandler;
@@ -47180,8 +47180,476 @@ var semver2 = __toESM(require_semver(), 1);
 // src/download/checksum/known-version.ts
 var semver = __toESM(require_semver(), 1);

-// src/download/checksum/known-checksums.ts
-var KNOWN_CHECKSUMS = {
+// src/download/checksum/known-checksums.json
+var known_checksums_default = {
+  "aarch64-apple-darwin-0.13.5": "743f85035a1996ecb350659e01cd9faea9709829be09b1b4b03c73eaf3c9cd73",
+  "aarch64-pc-windows-msvc-0.13.5": "09f47edf90726084a70f9426f6e3ca4f46e9bf7cbf23b1716ec64d60b055fae3",
+  "aarch64-unknown-linux-gnu-0.13.5": "4bb69cf95ed13f23713bb7bc09f241896ea0c75b7c557e615a20604b82f9c403",
+  "aarch64-unknown-linux-musl-0.13.5": "7906c79adb21c81abd559841ba76bb1d9af9d791acac7a041b2972e03ae16538",
+  "arm-unknown-linux-musleabihf-0.13.5": "0ffc73aead06a19ed9b63fb7f81f6376d12146829d509dda1585a8bfa3256f5e",
+  "armv7-unknown-linux-gnueabihf-0.13.5": "fe6b5b1d30b28b9dec45cfd8f60fec38941e18a8f9b1e64530dd197aba68dd07",
+  "armv7-unknown-linux-musleabihf-0.13.5": "980649d802ee0c41127184f0d8c0461d1f0004e967246df9602bbb9ab983ca7f",
+  "i686-pc-windows-msvc-0.13.5": "96228420d0a89a64757afba59932c1e58c4977e4122f2cc9f8615a51ba2d3084",
+  "i686-unknown-linux-gnu-0.13.5": "f5713d6c05d77d01de9655270d713ba87ed45391752f489c80bbf1690bccc17c",
+  "i686-unknown-linux-musl-0.13.5": "ef427365b5e84790d3f807bd0dfda0d8ee89e78f47e0cfdf86378a5bd9b13894",
+  "powerpc64le-unknown-linux-gnu-0.13.5": "f891bc62de89832775d5104ad3b3332848122536a8dc8bac5775a18cce42b845",
+  "riscv64gc-unknown-linux-gnu-0.13.5": "5c2692ecbf3a9d2c5955c403b30e61740b3ea2fdcc9b6eb533eeda268bf2b56d",
+  "riscv64gc-unknown-linux-musl-0.13.5": "485ffd2d7623fd98f791cb6ab45aa967f1605e3f691666fc49713e3feb2362b9",
+  "s390x-unknown-linux-gnu-0.13.5": "b383e82d562f269fffbb69f44258ae278b6f4b45fbe7e572574669021b547e94",
+  "x86_64-apple-darwin-0.13.5": "b0f52b0e3945b4107d89024ea38e625683011fbfc05a0d98f9fa2d6dcee28c66",
+  "x86_64-pc-windows-msvc-0.13.5": "a38b8d1902b7cfbc76b423ba1bb456f623f42064cdc72628b6075b89afd1019a",
+  "x86_64-unknown-linux-gnu-0.13.5": "f68d291c75783122dad58ab77def0e13f3233f358731db5d6d7e8715603b928f",
+  "x86_64-unknown-linux-musl-0.13.5": "57ef9d9ccb01fb1bd998df995b0dd221b52f7d7841fbea93f2d4463bf61fb7a9",
+  "aarch64-apple-darwin-0.13.4": "e0b1d4743ce64c55d9f0f4a444afa6b81125680070ee04e853fcd0f6c1ebf8f1",
+  "aarch64-pc-windows-msvc-0.13.4": "c4bc5a9534b2bb6a12fe29ea748445e1a6f9cb7bb275211c4fb74c52ecf317a5",
+  "aarch64-unknown-linux-gnu-0.13.4": "1ae72b4718729e2ccc4f1ae2c6d1e531ca8467800e0546e9130b3886023a60ab",
+  "aarch64-unknown-linux-musl-0.13.4": "253a17cadcb659ae77a0fe3b9a2f1c14297528d480c421899e61e64d64f24e8f",
+  "arm-unknown-linux-musleabihf-0.13.4": "86df14c4dc6d98822b84c9fdf1ad626e2d4a81be60c49bd56a8840b9b70d9fdc",
+  "armv7-unknown-linux-gnueabihf-0.13.4": "9e52201e4502e349f27020879283736ca184185363ec8328554fd26596e61eb8",
+  "armv7-unknown-linux-musleabihf-0.13.4": "d69261a33fbfabf3ff811ccd1f964920919a4f45bbcbd867913369cbfb32d0e3",
+  "i686-pc-windows-msvc-0.13.4": "b450f623b34bf85322bbc656d5879915acd818dc5b05fc2d33e343da26799e37",
+  "i686-unknown-linux-gnu-0.13.4": "8c72700f224979886ab41003a46cbac5a8ba070ff5857717026a3b4b144c5686",
+  "i686-unknown-linux-musl-0.13.4": "985ef009e3bb182ce701c7911cd8d6296ccf2690b6dfd434972fbf64ff3f9057",
+  "powerpc64le-unknown-linux-gnu-0.13.4": "ae7320fcf963ed6ca19bacf436cf5d71cd5c9fbaf66450d614e7673c1f876be4",
+  "riscv64gc-unknown-linux-gnu-0.13.4": "0173f624fd99811a12c1e1d1b0c476d9e850b3408ab01b8d513028376fb1c9c0",
+  "riscv64gc-unknown-linux-musl-0.13.4": "250aa02f66cf080651f13c9696dece1023f1e38a825f9c9a8f21627ccb3a3ef2",
+  "s390x-unknown-linux-gnu-0.13.4": "e2ccfa8c19d340cd282c91f715dd37b7f0c5efa9b256c0a6c373fec3e01ec20d",
+  "x86_64-apple-darwin-0.13.4": "7be2dcd316122f4b3e5a0a7889f6248266c14425374e105ff7dc9779184603a6",
+  "x86_64-pc-windows-msvc-0.13.4": "ccec7508a07d9933d7cb1261880633efcf1f30d6e6eddab21823f1dae6f23225",
+  "x86_64-unknown-linux-gnu-0.13.4": "2b428396f12572d4429cf210ca234dd599a33b3af0958a4d5ed569d63e3f344f",
+  "x86_64-unknown-linux-musl-0.13.4": "28d4385f9f9d1d1c7654d85b3855e0e2615b2f6cc13136a2edff858bbdc16ff1",
+  "aarch64-apple-darwin-0.13.3": "bf1e4fb6f5f5079a2902ad3f3a9e2d337575b226a1378f2449d8404353650608",
+  "aarch64-pc-windows-msvc-0.13.3": "aeaca1a1b721c1686c09b4aa23d57f938df049bed1b8e534b5bf79a032b8b87b",
+  "aarch64-unknown-linux-gnu-0.13.3": "611ff684f193a84d2fdad29c5f12505d02ece94984c7c982cdde950eba5c95b9",
+  "aarch64-unknown-linux-musl-0.13.3": "4a58785768ab0577497ca7940be2f9fd5a34e48c3fd37923692fc0a81d71ac9f",
+  "arm-unknown-linux-musleabihf-0.13.3": "ad9f4041e97b723da4238295b531850e31fd007f807b60040dc82d982268220c",
+  "armv7-unknown-linux-gnueabihf-0.13.3": "51a2ba864b76824fc208a91c1e2da02caf475036e083268a2974af69024aa867",
+  "armv7-unknown-linux-musleabihf-0.13.3": "3cd65b49fe3e163d538b306b1eebdbbf80bd95bb498f863db917a2554f4fe5ec",
+  "i686-pc-windows-msvc-0.13.3": "887d05656858bb9402a9d094c371012e7a1227cde4ddb84898b3a940673d17dd",
+  "i686-unknown-linux-gnu-0.13.3": "91565a548a4b8b9ad78b5b6db534ca217cd9851b214419ca6d0af3e5d85a6e09",
+  "i686-unknown-linux-musl-0.13.3": "3df2a0dc3f309156740c0088022f26ea0aa121ce6bc27d6afeedce25026e35e8",
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+  "x86_64-unknown-linux-gnu-0.12.7": "788f18abea7c5f55d6216e4f5613fd89d4d59b631efeec117b2b07fe72f1da21",
+  "x86_64-unknown-linux-musl-0.12.7": "3d64d44ed67da7908dc7f5c4d64ebb44bad326fa17f8a0a52fc9a7793017bbe1",
+  "aarch64-apple-darwin-0.12.6": "14b459d51ea2e71eeba28c45a268c922bdf8607fc6455e3f40b4e082895d160d",
+  "aarch64-pc-windows-msvc-0.12.6": "6dda514fbbe3152d980758e0f6347116060114d7d24932fc0ea5d8063f8b253a",
+  "aarch64-unknown-linux-gnu-0.12.6": "d58030acd26159499ac82f32da12d1b3c12a3a1bfc414232d9082070c03e128d",
+  "aarch64-unknown-linux-musl-0.12.6": "3719891de9ab41c878a84331e55826d2a46421976a346a65326513a6795b089a",
+  "arm-unknown-linux-musleabihf-0.12.6": "917aa56d9318f8ad9509d941625feb49d2a444363c82143b7f79ebef0df7cecc",
+  "armv7-unknown-linux-gnueabihf-0.12.6": "2bde552a6288852ce4858e740d9434b64cd9edbba1956f6170c43ad93867a5ac",
+  "armv7-unknown-linux-musleabihf-0.12.6": "ad000efcd6e82ee76f01c523e5fdf267638625307d8d211fd73d6acaee7968e6",
+  "i686-pc-windows-msvc-0.12.6": "ddec1f1ca7b96fbd3822b5dff3fbade7add64a03afc334e2fd31d4820911f447",
+  "i686-unknown-linux-gnu-0.12.6": "2c93b0ef748675555a2af0cbc45a51f7b2e7014f9a0e34ae28d092e0293990d8",
+  "i686-unknown-linux-musl-0.12.6": "3cdda2dd5ad434399cd4788ae70d8057a4549e91f725135c07d2a09a6c4f1c5a",
+  "powerpc64le-unknown-linux-gnu-0.12.6": "474660a7d36d10ae156e0acfe3d1fac6ce9a684f6d6d92287c370d9b7a2f4173",
+  "riscv64gc-unknown-linux-gnu-0.12.6": "978541918503866f21863353570c702d981596210bd3b05a816f037a97897f31",
+  "riscv64gc-unknown-linux-musl-0.12.6": "83357df6b043c3e1f0d8e91cd90ccbe835ecc2f8bf4d6be6cb220b20b8b67a32",
+  "s390x-unknown-linux-gnu-0.12.6": "05a05615e8227bf89902301ea29a7bf424d8caef8d9dca682c149ad34df2d31a",
+  "x86_64-apple-darwin-0.12.6": "2a26ea71bbeff1c7e12c2cc40245c96a041deff276bc921e7038e304d5d3e04c",
+  "x86_64-pc-windows-msvc-0.12.6": "df7cb9f243eae1621400d4fcf5b1b3d90f20e264ece91b64deb3b0078abca6ef",
+  "x86_64-unknown-linux-gnu-0.12.6": "8681d8921e7d520fb368991dcf5f9c1905b80f5bf2a265a0ed085c8d8e342477",
+  "x86_64-unknown-linux-musl-0.12.6": "14e4172aace66a475062cebec7ca04f497d5619e95325dfcc9e4447b9c516846",
+  "aarch64-apple-darwin-0.12.5": "5bb0e5fe008a773c3dbcb97ff79cd89e1241464fe9d2f986d52ad8f1b037bd62",
+  "aarch64-pc-windows-msvc-0.12.5": "724279317fee6e5fa8ad1908e4eba2bbe764ef1ece5b3f4597927b62b1fe562a",
+  "aarch64-unknown-linux-gnu-0.12.5": "9bf43b4d1a07665bf64d4c4e710930b382321a785e0eb10aac07f46471f86a31",
+  "aarch64-unknown-linux-musl-0.12.5": "8767a0e77f2cd45436401b1b42bf7e9ed5a4a91a74a5305d6fe93249d0f6dbc5",
+  "arm-unknown-linux-musleabihf-0.12.5": "970f86ddcd1373120c1e7ee246b533c2e75366294098e1406f07ecf3bb55d260",
+  "armv7-unknown-linux-gnueabihf-0.12.5": "63f86f3cd92de223c2680dee5149ed3f317ad7aeac774fd7e6fe1f86f53e85da",
+  "armv7-unknown-linux-musleabihf-0.12.5": "62f838f29cad6fda061b1566168555978c544a4107697cd1967398b7f8efea84",
+  "i686-pc-windows-msvc-0.12.5": "a5993a7c2e75b418e60d5ed733204222330085b14e85269545b084c273c1629b",
+  "i686-unknown-linux-gnu-0.12.5": "4875a06092c3b0aa8ece5265a42b053dfef649adba26434b5e40eeb58c2a2aa5",
+  "i686-unknown-linux-musl-0.12.5": "b920f32f0910be363f770485117e08494eec0b09abb4f3f9f1f9b9f53a29394c",
+  "powerpc64le-unknown-linux-gnu-0.12.5": "af3f868fc8af2c3a688b1a202cbed507ec5bb32522876141f1b7f4200ed0395f",
+  "riscv64gc-unknown-linux-gnu-0.12.5": "2a6fe4a685225082d82f8afba169d038d669f85bf6cff7f5f733079a7b7282d5",
+  "riscv64gc-unknown-linux-musl-0.12.5": "c7fc653d16f0214eaaf2b3af537ec917af4861e3d00c0f10e0784fe4cbc1dcd6",
+  "s390x-unknown-linux-gnu-0.12.5": "858d51fd178fe99c69923cef568fbac3f297f3767c0e0d985aa172bc1f3e2274",
+  "x86_64-apple-darwin-0.12.5": "b3b2137477cf96c9686ebfb71524614cec780c673fd73e59bce099aef02e70e8",
+  "x86_64-pc-windows-msvc-0.12.5": "4c4d49d8738847d9b71ba319e49a5688c93eac0fe6204b1df24e98528dddf39a",
+  "x86_64-unknown-linux-gnu-0.12.5": "68a509da24b06b4223a1c0175fb5eb5bc79342b76cbeff0cfe51ac3f5b17b6b2",
+  "x86_64-unknown-linux-musl-0.12.5": "a4742988791c9aeae68c78150d6cba762062ad2a47e53738c2779d2b596bfcdb",
  "aarch64-apple-darwin-0.12.4": "99a913b606194867b43086404412c1afe079547fee72ecfb6af7e7b0dd54b0c6",
  "aarch64-pc-windows-msvc-0.12.4": "3290abffee78c30e3113f5113e26684fd057287e89124a588dcdcdd6ceec0fea",
  "aarch64-unknown-linux-gnu-0.12.4": "49d881b3403187e1f1789720881e77e4251ad4259d86c4844862657d2a35d13f",
@@ -52328,6 +52796,9 @@ var KNOWN_CHECKSUMS = {
  "x86_64-unknown-linux-musl-0.0.5": "705bbe04a93a9d4d9db5224c2f980a88bba272538a33a78ea2e966f46b4d5eb7"
 };

+// src/download/checksum/known-checksums.ts
+var KNOWN_CHECKSUMS = known_checksums_default;
+
 // src/download/checksum/known-version.ts
 var VERSION_IN_CHECKSUM_KEY_PATTERN = /-(\d+\.\d+\.\d+(?:[-+][0-9A-Za-z.-]+)?)$/;
 function getLatestKnownVersion() {
@@ -52355,9 +52826,8 @@ async function updateChecksums(filePath, checksumEntries) {
    }
    deduplicatedEntries.set(entry.key, entry.checksum);
  }
-  const body = [...deduplicatedEntries.entries()].map(([key, checksum]) => `  "${key}":
-    "${checksum}"`).join(",\n");
-  const content = "// AUTOGENERATED_DO_NOT_EDIT\nexport const KNOWN_CHECKSUMS: { [key: string]: string } = {\n" + body + (body === "" ? "" : ",\n") + "};\n";
+  const content = `${JSON.stringify(Object.fromEntries(deduplicatedEntries), null, 2)}
+`;
  await import_node_fs.promises.writeFile(filePath, content);
 }

@@ -52370,23 +52840,12 @@ var VERSIONS_MANIFEST_URL = "https://raw.githubusercontent.com/astral-sh/version

 // src/utils/fetch.ts
 var import_undici2 = __toESM(require_undici2(), 1);
-function getProxyAgent() {
-  const httpProxy = process.env.HTTP_PROXY || process.env.http_proxy;
-  if (httpProxy) {
-    return new import_undici2.ProxyAgent(httpProxy);
-  }
-  const httpsProxy = process.env.HTTPS_PROXY || process.env.https_proxy;
-  if (httpsProxy) {
-    return new import_undici2.ProxyAgent(httpsProxy);
-  }
-  return void 0;
-}
 var fetch = async (url, opts) => {
  const timeoutSignal = AbortSignal.timeout(5e3);
  const existingSignal = opts.signal;
  const mergedSignal = existingSignal ? AbortSignal.any([timeoutSignal, existingSignal]) : timeoutSignal;
  return await (0, import_undici2.fetch)(url, {
-    dispatcher: getProxyAgent(),
+    dispatcher: new import_undici2.EnvHttpProxyAgent(),
    ...opts,
    signal: mergedSignal
  });
@@ -6,7 +6,7 @@ This document covers advanced options for configuring which version of uv to ins

 ```yaml
 - name: Install the latest version of uv
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    version: "latest"
 ```
@@ -19,7 +19,7 @@ When `manifest-file` is set, `latest-known` still selects a version from setup-u

 ```yaml
 - name: Install the latest version of uv known to setup-uv
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    version: "latest-known"
 ```
@@ -28,7 +28,7 @@ When `manifest-file` is set, `latest-known` still selects a version from setup-u

 ```yaml
 - name: Install a specific version of uv
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    version: "0.4.4"
 ```
@@ -41,21 +41,21 @@ to install the latest version that satisfies the range.

 ```yaml
 - name: Install a semver range of uv
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    version: ">=0.4.0"
 ```

 ```yaml
 - name: Pinning a minor version of uv
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    version: "0.4.x"
 ```

 ```yaml
 - name: Install a pep440-specifier-satisfying version of uv
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    version: ">=0.4.25,<0.5"
 ```
@@ -67,7 +67,7 @@ You can change this behavior using the `resolution-strategy` input:

 ```yaml
 - name: Install the lowest compatible version of uv
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    version: ">=0.4.0"
    resolution-strategy: "lowest"
@@ -92,7 +92,7 @@ as `UV_PYTHON`. Only a single Python version is supported; multiple fallback ver

 ```yaml
 - name: Install uv based on the version defined in pyproject.toml
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    version-file: "pyproject.toml"
 ```
@@ -103,7 +103,7 @@ silently picking up a newer uv until the lockfile is updated.

 ```yaml
 - name: Install uv based on the version locked in uv.lock
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    version-file: "uv.lock"
 ```
@@ -11,6 +11,7 @@ The cache key is automatically generated based on:
  `pc-windows-msvc`)
 - **OS version**: OS name and version (e.g., `ubuntu-22.04`, `macos-14`, `windows-2022`)
 - **Python version**: The Python version in use
+- **Python architecture**: The architecture selected by `python-arch` or `UV_PYTHON_ARCH`, when set
 - **Cache options**: Whether pruning and Python caching are enabled
 - **Dependency hash**: Hash of files matching `cache-dependency-glob`
 - **Suffix**: Optional `cache-suffix` if provided
@@ -23,7 +24,7 @@ The computed cache key is available as the `cache-key` output:
 ```yaml
 - name: Setup uv
  id: setup-uv
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    enable-cache: true
 - name: Print cache key
@@ -53,7 +54,7 @@ You can optionally define a custom cache key suffix.
 ```yaml
 - name: Enable caching and define a custom cache key suffix
  id: setup-uv
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    enable-cache: true
    cache-suffix: "optional-suffix"
@@ -92,7 +93,7 @@ changes. If you use relative paths, they are relative to the working directory.

 ```yaml
 - name: Define a cache dependency glob
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    enable-cache: true
    cache-dependency-glob: "**/pyproject.toml"
@@ -100,7 +101,7 @@ changes. If you use relative paths, they are relative to the working directory.

 ```yaml
 - name: Define a list of cache dependency globs
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    enable-cache: true
    cache-dependency-glob: |
@@ -110,7 +111,7 @@ changes. If you use relative paths, they are relative to the working directory.

 ```yaml
 - name: Define an absolute cache dependency glob
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    enable-cache: true
    cache-dependency-glob: "/tmp/my-folder/requirements*.txt"
@@ -118,7 +119,7 @@ changes. If you use relative paths, they are relative to the working directory.

 ```yaml
 - name: Never invalidate the cache
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    enable-cache: true
    cache-dependency-glob: ""
@@ -131,7 +132,7 @@ By default, the cache will be restored.

 ```yaml
 - name: Don't restore an existing cache
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    enable-cache: true
    restore-cache: false
@@ -139,13 +140,15 @@ By default, the cache will be restored.

 ## Save cache

-You can also disable saving the cache after the run with the `save-cache` input.
+You can control saving the cache after the run with the `save-cache` input.
 This can be useful to save cache storage when you know you will not use the cache of the run again.
-By default, the cache will be saved.
+By default, `save-cache: auto` saves the cache except for `merge_group` events, where caches created
+for temporary merge queue refs are unlikely to be reused. Cache restoration remains enabled for
+these events. Set `save-cache: true` to save the cache for all events.

 ```yaml
 - name: Don't save the cache after the run
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    enable-cache: true
    save-cache: false
@@ -171,7 +174,7 @@ It defaults to `setup-uv-cache` in the `TMP` dir, `D:\a\_temp\setup-uv-cache` on

 ```yaml
 - name: Define a custom uv cache path
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    cache-local-path: "/path/to/cache"
 ```
@@ -188,7 +191,7 @@ If you want to prune the cache before saving it, enable cache pruning with the `

 ```yaml
 - name: Prune the cache before saving it
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    enable-cache: true
    prune-cache: true
@@ -207,7 +210,7 @@ To force managed Python installs, set `UV_PYTHON_PREFERENCE=only-managed`.

 ```yaml
 - name: Cache Python installs
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    enable-cache: true
    cache-python: true
@@ -225,7 +228,7 @@ If you want to ignore this, set the `ignore-nothing-to-cache` input to `true`.

 ```yaml
 - name: Ignore nothing to cache
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    enable-cache: true
    ignore-nothing-to-cache: true
@@ -4,13 +4,14 @@ This document covers advanced customization options including checksum validatio

 ## Validate checksum

-You can specify a checksum to validate the downloaded executable. Checksums up to the default version
-are automatically verified by this action. The sha256 hashes can be found on the
+Downloaded executables are automatically verified using checksums bundled with this action or,
+for newer, not yet bundled versions, the checksum from [`astral-sh/versions`](https://github.com/astral-sh/versions).
+You can specify a checksum to override those values. The sha256 hashes can also be found on the
 [releases page](https://github.com/astral-sh/uv/releases) of the uv repo.

 ```yaml
 - name: Install a specific version and validate the checksum
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    version: "0.3.1"
    checksum: "e11b01402ab645392c7ad6044db63d37e4fd1e745e015306993b07695ea5f9f8"
@@ -39,7 +40,7 @@ The `archive_format` field is currently ignored.

 ```yaml
 - name: Use a custom manifest file
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    manifest-file: "https://example.com/my-custom-manifest.ndjson"
 ```
@@ -58,7 +59,7 @@ You can disable this by setting the `add-problem-matchers` input to `false`.

 ```yaml
 - name: Install the latest version of uv without problem matchers
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    add-problem-matchers: false
 ```
@@ -9,7 +9,7 @@ This allows directly using it in later steps:

 ```yaml
 - name: Install the latest version of uv and activate the environment
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    activate-environment: true
 - run: uv pip install pip
@@ -17,10 +17,22 @@ This allows directly using it in later steps:

 By default, the venv is created at `.venv` inside the `working-directory`.

+With `activate-environment: true`, the `python-runtime-id` output identifies the
+venv's Python runtime as reported by uv. This is an opaque identifier that users of the action
+can use as a cache key if necessary; users should not assume anything about
+the stability or structure of the identifier itself.
+
+For example, you can combine it with the platform and dependency information relevant to
+your cache with `id: setup-uv` on the setup step:
+
+```yaml
+key: build-${{ runner.os }}-${{ runner.arch }}-${{ steps.setup-uv.outputs.python-runtime-id }}-${{ hashFiles('uv.lock') }}
+```
+
 You can customize the venv location with `venv-path`, for example to place it in the runner temp directory:

 ```yaml
- uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+- uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    activate-environment: true
    venv-path: ${{ runner.temp }}/custom-venv
@@ -51,7 +63,7 @@ are not sufficient, you can provide a custom GitHub token with the necessary per

 ```yaml
 - name: Install the latest version of uv with a custom GitHub token
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    github-token: ${{ secrets.CUSTOM_GITHUB_TOKEN }}
 ```
@@ -69,7 +81,7 @@ input:

 ```yaml
 - name: Install the latest version of uv with a custom tool dir
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    tool-dir: "/path/to/tool/dir"
 ```
@@ -88,7 +100,7 @@ If you want to change this behaviour (especially on self-hosted runners) you can

 ```yaml
 - name: Install the latest version of uv with a custom tool bin dir
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    tool-bin-dir: "/path/to/tool-bin/dir"
 ```
@@ -105,7 +117,7 @@ This action supports expanding the `~` character to the user's home directory fo

 ```yaml
 - name: Expand the tilde character
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    cache-local-path: "~/path/to/cache"
    tool-dir: "~/path/to/tool/dir"
@@ -122,7 +134,7 @@ If you want to ignore this, set the `ignore-empty-workdir` input to `true`.

 ```yaml
 - name: Ignore empty workdir
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    ignore-empty-workdir: true
 ```
@@ -132,6 +144,7 @@ If you want to ignore this, set the `ignore-empty-workdir` input to `true`.
 This action sets several environment variables that influence uv's behavior and can be used by subsequent steps:

 - `UV_PYTHON`: Set when `python-version` is specified or the selected `.tool-versions` file contains a supported `python` entry. Controls which Python version uv uses.
+- `UV_PYTHON_ARCH`: Set when `python-arch` is specified. Controls the architecture of Python requests that do not specify one.
 - `UV_CACHE_DIR`: Set when caching is enabled (unless already configured in uv config files). Controls where uv stores its cache.
 - `UV_TOOL_DIR`: Set when `tool-dir` input is specified. Controls where uv installs tool environments.
 - `UV_TOOL_BIN_DIR`: Set when `tool-bin-dir` input is specified. Controls where uv installs tool binaries.
@@ -143,10 +156,11 @@ This action sets several environment variables that influence uv's behavior and
 - `UV_NO_MODIFY_PATH`: If set, prevents the action from modifying PATH. Cannot be used with `activate-environment`.
 - `UV_CACHE_DIR`: If already set, the action will respect it instead of setting its own cache directory.
 - `UV_PYTHON`: If already set and `python-version` is not specified, the action will respect it instead of using the `python` entry from `.tool-versions`.
+- `UV_PYTHON_ARCH`: If already set and `python-arch` is not specified, the action will use it and include it in the cache key. Requires a uv version that supports `UV_PYTHON_ARCH`.

 ```yaml
 - name: Example using environment variables
-  uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d # v10.0.0
+  uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
  with:
    python-version: "3.12"
    tool-dir: "/custom/tool/dir"
@@ -5,6 +5,16 @@
  "type": "module",
  "description": "Set up your GitHub Actions workflow with a specific version of uv",
  "main": "dist/setup/index.cjs",
+  "engines": {
+    "npm": ">=11.10.0"
+  },
+  "devEngines": {
+    "packageManager": {
+      "name": "npm",
+      "version": ">=11.10.0",
+      "onFail": "error"
+    }
+  },
  "scripts": {
    "build": "tsc --noEmit",
    "check": "biome check --write",
@@ -12,7 +22,7 @@
    "test:unit": "node --experimental-vm-modules ./node_modules/jest/bin/jest.js",
    "test": "npm run build && npm run test:unit",
    "act": "act pull_request -W .github/workflows/test.yml --container-architecture linux/amd64 -s GITHUB_TOKEN=\"$(gh auth token)\"",
-    "update-known-checksums": "RUNNER_TEMP=known_versions node dist/update-known-checksums/index.cjs src/download/checksum/known-checksums.ts",
+    "update-known-checksums": "RUNNER_TEMP=known_versions node dist/update-known-checksums/index.cjs src/download/checksum/known-checksums.json",
    "all": "npm run build && npm run check && npm run package && npm run test:unit"
  },
  "repository": {
@@ -35,18 +45,18 @@
    "@actions/io": "^3.0.2",
    "@actions/tool-cache": "^4.0.0",
    "@renovatebot/pep440": "^5.0.0",
-    "smol-toml": "^1.7.1",
+    "smol-toml": "^1.8.0",
    "undici": "^8.10.0"
  },
  "devDependencies": {
-    "@biomejs/biome": "^2.5.7",
+    "@biomejs/biome": "^2.5.11",
    "@types/js-yaml": "^4.0.9",
-    "@types/node": "^26.1.2",
+    "@types/node": "^26.4.0",
    "@types/semver": "^7.8.0",
-    "@vercel/ncc": "^0.44.1",
-    "esbuild": "^0.28.1",
-    "jest": "^30.4.2",
-    "js-yaml": "^5.2.3",
+    "@vercel/ncc": "^0.45.0",
+    "esbuild": "^0.28.2",
+    "jest": "^30.5.0",
+    "js-yaml": "^5.4.1",
    "ts-jest": "^29.4.11",
    "typescript": "^6.0.3"
  }
@@ -9,6 +9,8 @@ const builds = [
  },
  {
    entryPoints: ["src/save-cache.ts"],
+    // @actions/cache compares error.name to the error constructor's name.
+    keepNames: true,
    outfile: "dist/save-cache/index.cjs",
    staleOutfiles: ["dist/save-cache/index.mjs"],
  },
@@ -98,11 +98,14 @@ async function computeKeys(
    ? `-${encodeURIComponent(inputs.cacheSuffix)}`
    : "";
  const version = encodeURIComponent(pythonVersion ?? "unknown");
+  const pythonArchKey = inputs.pythonArch
+    ? `-python-${encodeURIComponent(inputs.pythonArch)}`
+    : "";
  const platform = await getPlatform();
  const osNameVersion = getOSNameVersion();
  const pruned = inputs.pruneCache ? "-pruned" : "";
  const python = inputs.cachePython ? "-py" : "";
-  return `setup-uv-${CACHE_VERSION}-${getArch()}-${platform}-${osNameVersion}-${version}${pruned}${python}${cacheDependencyPathHash}${suffix}`;
+  return `setup-uv-${CACHE_VERSION}-${getArch()}-${platform}-${osNameVersion}-${version}${pythonArchKey}${pruned}${python}${cacheDependencyPathHash}${suffix}`;
 }

 function handleMatchResult(
@@ -11,19 +11,30 @@ export async function validateChecksum(
  arch: Architecture,
  platform: Platform,
  version: string,
+  manifestChecksum?: string,
 ): Promise<void> {
  const key = `${arch}-${platform}-${version}`;
  const hasProvidedChecksum = checksum !== undefined && checksum !== "";
-  const checksumToUse = hasProvidedChecksum ? checksum : KNOWN_CHECKSUMS[key];
+  const knownChecksum = KNOWN_CHECKSUMS[key];
+  const hasManifestChecksum =
+    manifestChecksum !== undefined && manifestChecksum !== "";
+  const checksumToUse = hasProvidedChecksum
+    ? checksum
+    : (knownChecksum ?? (hasManifestChecksum ? manifestChecksum : undefined));

  if (checksumToUse === undefined) {
+    if (manifestChecksum !== undefined) {
+      throw new Error(`No checksum found for ${key} in manifest.`);
+    }
    core.debug(`No checksum found for ${key}.`);
    return;
  }

  const checksumSource = hasProvidedChecksum
    ? "provided checksum"
-    : `KNOWN_CHECKSUMS entry for ${key}`;
+    : knownChecksum !== undefined
+      ? `KNOWN_CHECKSUMS entry for ${key}`
+      : "manifest checksum";

  core.debug(`Validating checksum using ${checksumSource}.`);
  const isValid = await validateFileCheckSum(downloadPath, checksumToUse);
@@ -19,16 +19,7 @@ export async function updateChecksums(
    deduplicatedEntries.set(entry.key, entry.checksum);
  }

-  const body = [...deduplicatedEntries.entries()]
-    .map(([key, checksum]) => `  "${key}":\n    "${checksum}"`)
-    .join(",\n");
-
-  const content =
-    "// AUTOGENERATED_DO_NOT_EDIT\n" +
-    "export const KNOWN_CHECKSUMS: { [key: string]: string } = {\n" +
-    body +
-    (body === "" ? "" : ",\n") +
-    "};\n";
+  const content = `${JSON.stringify(Object.fromEntries(deduplicatedEntries), null, 2)}\n`;

  await fs.writeFile(filePath, content);
 }
@@ -47,12 +47,14 @@ export async function downloadVersion(
    );
  }

-  // For the default astral-sh/versions source, checksum validation relies on
-  // user input or the built-in KNOWN_CHECKSUMS table, not manifest sha256 values.
+  // Custom manifests are explicitly selected by the user, so their checksum
+  // takes precedence over the built-in table. For the default manifest, pass
+  // its checksum as a fallback after user input and KNOWN_CHECKSUMS.
  const resolvedChecksum =
    manifestUrl === undefined
      ? checksum
      : resolveChecksum(checksum, artifact.checksum);
+  const manifestChecksum = artifact.checksum;

  const mirrorUrl = downloadFromAstralMirror
    ? rewriteToMirror(artifact.downloadUrl)
@@ -67,6 +69,7 @@ export async function downloadVersion(
      arch,
      version,
      resolvedChecksum,
+      manifestChecksum,
      githubTokenForUrl(downloadUrl, githubToken),
    );
  } catch (err) {
@@ -85,6 +88,7 @@ export async function downloadVersion(
      arch,
      version,
      resolvedChecksum,
+      manifestChecksum,
      githubTokenForUrl(artifact.downloadUrl, githubToken),
    );
  }
@@ -122,6 +126,7 @@ async function downloadArtifact(
  arch: Architecture,
  version: string,
  checksum: string | undefined,
+  manifestChecksum: string | undefined,
  githubToken: string | undefined,
 ): Promise<{ version: string; cachedToolDir: string }> {
  log.info(`Downloading uv from "${downloadUrl}" ...`);
@@ -130,7 +135,14 @@ async function downloadArtifact(
    undefined,
    githubToken,
  );
-  await validateChecksum(checksum, downloadPath, arch, platform, version);
+  await validateChecksum(
+    checksum,
+    downloadPath,
+    arch,
+    platform,
+    version,
+    manifestChecksum,
+  );

  let uvDir: string;
  if (platform === "pc-windows-msvc") {
@@ -16,6 +16,8 @@ import {
  getPlatform,
  type Platform,
 } from "./utils/platforms";
+import { setupPythonArch } from "./utils/python-arch";
+import { getPythonRuntimeId } from "./utils/python-runtime";
 import { resolveUvVersion } from "./version/resolve";

 const sourceDir = __dirname;
@@ -85,6 +87,11 @@ async function run(): Promise<void> {
      throw new Error(`Unsupported architecture: ${process.arch}`);
    }
    const setupResult = await setupUv(inputs, platform, arch);
+    const uvPath = path.join(
+      setupResult.uvDir,
+      process.platform === "win32" ? "uv.exe" : "uv",
+    );
+    await setupPythonArch(uvPath, inputs.pythonArch, inputs.exportPythonArch);

    addToolBinToPath(inputs);
    addUvToPathAndOutput(setupResult.uvDir);
@@ -101,6 +108,7 @@ async function run(): Promise<void> {

    const detectedPythonVersion = await getPythonVersion(inputs);
    core.setOutput("python-version", detectedPythonVersion);
+    core.setOutput("python-runtime-id", await getPythonRuntimeId(inputs));

    if (inputs.enableCache) {
      await restoreCache(inputs, detectedPythonVersion);
@@ -1,18 +1,8 @@
-import { ProxyAgent, type RequestInit, fetch as undiciFetch } from "undici";
-
-export function getProxyAgent() {
-  const httpProxy = process.env.HTTP_PROXY || process.env.http_proxy;
-  if (httpProxy) {
-    return new ProxyAgent(httpProxy);
-  }
-
-  const httpsProxy = process.env.HTTPS_PROXY || process.env.https_proxy;
-  if (httpsProxy) {
-    return new ProxyAgent(httpsProxy);
-  }
-
-  return undefined;
-}
+import {
+  EnvHttpProxyAgent,
+  type RequestInit,
+  fetch as undiciFetch,
+} from "undici";

 export const fetch = async (url: string, opts: RequestInit) => {
  // Merge timeout signal with any existing signal from opts
@@ -23,7 +13,7 @@ export const fetch = async (url: string, opts: RequestInit) => {
    : timeoutSignal;

  return await undiciFetch(url, {
-    dispatcher: getProxyAgent(),
+    dispatcher: new EnvHttpProxyAgent(),
    ...opts,
    signal: mergedSignal,
  });
@@ -24,6 +24,8 @@ export interface SetupInputs {
  version: string;
  versionFile: string;
  pythonVersion: string;
+  pythonArch: string;
+  exportPythonArch: boolean;
  activateEnvironment: boolean;
  noProject: boolean;
  venvPath: string;
@@ -54,13 +56,16 @@ export function loadInputs(): SetupInputs {
  const version = core.getInput("version");
  const versionFile = getVersionFile(workingDirectory);
  const pythonVersion = getPythonVersion(versionFile);
+  const pythonArchInput = core.getInput("python-arch");
+  const pythonArch = pythonArchInput || process.env.UV_PYTHON_ARCH || "";
+  const exportPythonArch = pythonArchInput !== "";
  const activateEnvironment = core.getBooleanInput("activate-environment");
  const noProject = core.getBooleanInput("no-project");
  const venvPath = getVenvPath(workingDirectory, activateEnvironment);
  const checksum = core.getInput("checksum");
  const enableCache = getEnableCache();
  const restoreCache = core.getInput("restore-cache") === "true";
-  const saveCache = core.getInput("save-cache") === "true";
+  const saveCache = getSaveCache();
  const cacheSuffix = core.getInput("cache-suffix") || "";
  const cacheLocalPath = getCacheLocalPath(
    workingDirectory,
@@ -94,12 +99,14 @@ export function loadInputs(): SetupInputs {
    checksum,
    downloadFromAstralMirror,
    enableCache,
+    exportPythonArch,
    githubToken,
    ignoreEmptyWorkdir,
    ignoreNothingToCache,
    manifestFile,
    noProject,
    pruneCache,
+    pythonArch,
    pythonDir,
    pythonVersion,
    quiet,
@@ -189,6 +196,18 @@ function getEnableCache(): boolean {
  return enableCacheInput === "true";
 }

+function getSaveCache(): boolean {
+  const saveCacheInput = core.getInput("save-cache");
+  if (saveCacheInput === "auto") {
+    if (process.env.GITHUB_EVENT_NAME === "merge_group") {
+      log.info("Cache saving is disabled for the merge_group event");
+      return false;
+    }
+    return true;
+  }
+  return saveCacheInput === "true";
+}
+
 function getToolBinDir(workingDirectory: string): string | undefined {
  const toolBinDirInput = core.getInput("tool-bin-dir");
  if (toolBinDirInput !== "") {
@@ -0,0 +1,75 @@
+import { execFile } from "node:child_process";
+import { promisify } from "node:util";
+import * as core from "@actions/core";
+import * as log from "./logging";
+
+const execFileAsync = promisify(execFile);
+const PROBE_ARCH = "setup-uv-probe";
+
+export async function setupPythonArch(
+  uvPath: string,
+  pythonArch: string,
+  exportPythonArch: boolean,
+): Promise<void> {
+  if (pythonArch === "") {
+    return;
+  }
+
+  // Older uv releases ignore unknown environment variables. An invalid architecture
+  // confirms that uv recognizes UV_PYTHON_ARCH without finding or downloading Python.
+  const probe = await queryPythonArch(uvPath, PROBE_ARCH);
+  if (probe.exitCode === 0) {
+    throw new Error(
+      "The installed version of uv does not support UV_PYTHON_ARCH. Select a newer uv version or use an architecture-qualified python-version.",
+    );
+  }
+  if (
+    !probe.stderr.includes(
+      `environment variable \`UV_PYTHON_ARCH\` with invalid value \`${PROBE_ARCH}\``,
+    )
+  ) {
+    throw new Error(
+      `Failed to check uv's support for UV_PYTHON_ARCH: ${probe.stderr.trim() || `uv exited with code ${probe.exitCode}`}`,
+    );
+  }
+
+  const selected = await queryPythonArch(uvPath, pythonArch);
+  if (selected.exitCode !== 0) {
+    throw new Error(
+      `Failed to set Python architecture to ${pythonArch}: ${selected.stderr.trim() || `uv exited with code ${selected.exitCode}`}`,
+    );
+  }
+
+  if (exportPythonArch) {
+    core.exportVariable("UV_PYTHON_ARCH", pythonArch);
+    log.info(`Set UV_PYTHON_ARCH to ${pythonArch}`);
+  }
+}
+
+async function queryPythonArch(
+  uvPath: string,
+  pythonArch: string,
+): Promise<{ exitCode: number; stderr: string }> {
+  try {
+    const { stderr } = await execFileAsync(
+      uvPath,
+      ["--no-config", "cache", "dir"],
+      {
+        encoding: "utf8",
+        env: { ...process.env, NO_COLOR: "1", UV_PYTHON_ARCH: pythonArch },
+      },
+    );
+    return { exitCode: 0, stderr };
+  } catch (error) {
+    if (
+      error instanceof Error &&
+      "code" in error &&
+      typeof error.code === "number" &&
+      "stderr" in error &&
+      typeof error.stderr === "string"
+    ) {
+      return { exitCode: error.code, stderr: error.stderr };
+    }
+    throw error;
+  }
+}
@@ -0,0 +1,43 @@
+import { execFile } from "node:child_process";
+import { promisify } from "node:util";
+import type { SetupInputs } from "./inputs";
+
+const execFileAsync = promisify(execFile);
+
+export async function getPythonRuntimeId(inputs: SetupInputs): Promise<string> {
+  if (!inputs.activateEnvironment) {
+    return "";
+  }
+
+  try {
+    // The venv path restricts results to this invocation's runtime, even if
+    // earlier setup-uv calls installed other Python versions in the same job.
+    const { stdout } = await execFileAsync(
+      "uv",
+      [
+        "python",
+        "list",
+        inputs.venvPath,
+        "--only-installed",
+        "--output-format",
+        "json",
+      ],
+      { encoding: "utf8" },
+    );
+    const pythons = JSON.parse(stdout);
+    if (
+      !Array.isArray(pythons) ||
+      pythons.length !== 1 ||
+      typeof pythons[0]?.key !== "string" ||
+      pythons[0].key === ""
+    ) {
+      throw new Error("Expected one installed Python with a runtime key");
+    }
+    return pythons[0].key;
+  } catch (error) {
+    throw new Error(
+      `Failed to identify the activated environment's Python runtime: ${error instanceof Error ? error.message : String(error)}`,
+      { cause: error },
+    );
+  }
+}
@@ -5,6 +5,7 @@
    "module": "esnext",
    "moduleResolution": "bundler",
    "noImplicitAny": true,
+    "resolveJsonModule": true,
    "strict": true,
    "target": "ES2022"
  },
@@ -1 +1 @@
 
 .19.0