diff --git a/modules/sync/requirements.txt b/modules/sync/requirements.txt
index 74333499..f757cdaa 100644
--- a/modules/sync/requirements.txt
+++ b/modules/sync/requirements.txt
@@ -5,7 +5,7 @@ Pillow==8.1.1
 pymongo==3.3.0
 PyPDF2==1.26.0
 python-frontmatter==0.3.1
-PyYAML==5.1
+PyYAML==5.4
 requests==2.20.0
 six==1.10.0
 smartcrop==0.1