diff --git a/requirements.txt b/requirements.txt
index 5176b4514..487c726e3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ Pygments==2.13.0
 pymdown-extensions==10.0
 pyparsing==3.0.9
 python-dateutil==2.8.2
-PyYAML==5.4
+PyYAML==5.3.1
 pyyaml_env_tag==0.1
 requests==2.28.1
 six==1.16.0