diff --git a/demo-app/requirements.txt b/demo-app/requirements.txt
index 30fa51c..25cd3a4 100644
--- a/demo-app/requirements.txt
+++ b/demo-app/requirements.txt
@@ -3,4 +3,4 @@ google-cloud-pubsub==0.42.1
 google-cloud-trace==0.21.0
 gunicorn==19.9.0
 opencensus==0.6.0
-Flask==1.1.0
+Flask==1.1.1