diff --git a/requirements.txt b/requirements.txt
index f4666b4..99947da 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 Babel==2.2.0
 PyYAML==3.11
-Werkzeug==0.9.4
+Werkzeug==0.15.3
 argparse==1.4.0
 ashes==15.0.1
 boltons==15.1.1