diff --git a/ClientServerTest/flaskapp/requirements.txt b/ClientServerTest/flaskapp/requirements.txt
index 3dcc092..9f2ad5f 100644
--- a/ClientServerTest/flaskapp/requirements.txt
+++ b/ClientServerTest/flaskapp/requirements.txt
@@ -36,7 +36,7 @@ pyasn1==0.4.8
 pylint==2.4.3
 python-dateutil==2.8.0
 pytz==2019.3
-PyYAML==3.13
+PyYAML==5.4
 requests==2.20.1
 rsa==3.4.2
 s3transfer==0.2.1