diff --git a/setup.py b/setup.py
index 700c70d..e679649 100755
--- a/setup.py
+++ b/setup.py
@@ -36,7 +36,7 @@
         "mdx-foldouts==1.0.0",
         "python-frontmatter==0.2.1",
         "pygments==2.4.0",
-        "PyYAML==6.0",
+        "PyYAML==6.0.3",
         "beautifulsoup4==4.11.1",
         "markdown_urlize==0.2.0",
         "markupsafe==2.0.1",