diff --git a/requirements.txt b/requirements.txt
index d56a228..290945b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,4 +20,4 @@ six==1.10.0
 traceback2==1.4.0
 twilio==6.9.0
 unittest2==1.1.0
-Werkzeug==0.11.2
+Werkzeug==0.15.5