diff --git a/example/restful_flask_example_with_sinon/requirement.txt b/example/restful_flask_example_with_sinon/requirement.txt
index 34574bd..318769e 100644
--- a/example/restful_flask_example_with_sinon/requirement.txt
+++ b/example/restful_flask_example_with_sinon/requirement.txt
@@ -12,4 +12,4 @@ python-dateutil==2.6.0
 pytz==2016.10
 sinon==0.1.1
 six==1.10.0
-Werkzeug==0.11.15
+Werkzeug==0.15.5