diff --git a/2013-05/requirements.txt b/2013-05/requirements.txt
index b3fe1f1..0306933 100644
--- a/2013-05/requirements.txt
+++ b/2013-05/requirements.txt
@@ -9,7 +9,7 @@ zope.interface==4.0.2
 Flask-Script==0.5.1
 Flask==0.9
 Jinja2==2.6
-Werkzeug==0.8.3
+Werkzeug==0.15.3
 path.py==2.4.1
 CherryPy==3.2.2
 python-ldap==2.4.10