diff --git a/testapps/flask/requirements.txt b/testapps/flask/requirements.txt
index 47e8a88..bb5516e 100644
--- a/testapps/flask/requirements.txt
+++ b/testapps/flask/requirements.txt
@@ -4,4 +4,4 @@ itsdangerous==0.24
 Jinja2==2.10
 MarkupSafe==1.0
 pkg-resources==0.0.0
-Werkzeug==0.14.1
+Werkzeug==0.15.3