diff --git a/requirements.txt b/requirements.txt
index 7aa62515..d34fe5e4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -24,4 +24,4 @@ boto3==1.7.8
 botocore==1.10.8
 Jinja2==2.10
 requests==2.24.0
-PyYAML==5.4
+PyYAML==5.3.1