diff --git a/requirements.txt b/requirements.txt
index 7f5ff64..4632051 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,4 +18,4 @@ markdown-emdash==0.1.0
 Pygments==2.7.4
 
 # Support frontmatter in YAML format
-PyYAML==5.3.1
+PyYAML==5.4