diff --git a/requirements.txt b/requirements.txt
index 5dd93f9..1846efd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -72,7 +72,7 @@ typed-ast==1.1.0
 urllib3==1.22
 wcwidth==0.1.7
 webencodings==0.5.1
-Werkzeug==0.14.1
+Werkzeug==0.15.3
 widgetsnbextension==3.0.8
 wiktionaryparser==0.0.97
 wrapt==1.10.11