diff --git a/requirements.txt b/requirements.txt
index 7916c60..553c493 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -34,4 +34,4 @@ virtualenv==15.1.0
 waitress==1.0.1
 WebOb==1.7.1
 WebTest==2.0.24
-Werkzeug==0.11.15
+Werkzeug==0.15.5