diff --git a/app-engine-demo/requirements.txt b/app-engine-demo/requirements.txt
old mode 100755
new mode 100644
index ddee779..15dd1bf
--- a/app-engine-demo/requirements.txt
+++ b/app-engine-demo/requirements.txt
@@ -1,4 +1,4 @@
 flask>=0.12.3
 GoogleAppEngineCloudStorageClient==1.9.22.1
-gunicorn==19.6.0
+gunicorn==22.0.0
 six==1.10.0