diff --git a/requirements.txt b/requirements.txt
index b641a9b..2d2e4bf 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-PyYaml==5.3
+PyYaml==5.3.1
 azure-common==1.1.24
 azure-mgmt-dns==3.0.0
 boto3==1.12.11