diff --git a/blogs/endpointslambda/aeflex-endpoints/requirements.txt b/blogs/endpointslambda/aeflex-endpoints/requirements.txt
index 79e196c6..720891ae 100644
--- a/blogs/endpointslambda/aeflex-endpoints/requirements.txt
+++ b/blogs/endpointslambda/aeflex-endpoints/requirements.txt
@@ -2,5 +2,5 @@ Flask==0.12
 flask-cors==3.0.2
 gunicorn==19.6.0
 six==1.10.0
-pyyaml==3.12
+pyyaml==5.4
 requests==2.13.0