diff --git a/requirements.txt b/requirements.txt
index 70ff031..fd78759 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,6 +7,6 @@ mkdocs==1.0.4
 mkdocs-material==4.1.1
 Pygments==2.3.1
 pymdown-extensions==6.0
-PyYAML==5.1
+PyYAML==5.4
 six==1.12.0
 tornado==6.0.2