diff --git a/requirements.txt b/requirements.txt
index d5f92bc..9ec2b55 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 Flask==1.0.2
-werkzeug==0.15.3
+werkzeug==0.15.5
 
 # Application server for both development and production.
 gunicorn==19.7.0