diff --git a/requirements.txt b/requirements.txt
index 922f869..97cc8ff 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -48,5 +48,5 @@ tornado==4.5.1
 traitlets==4.3.2
 wcwidth==0.1.7
 webencodings==0.5.1
-Werkzeug==0.12.1
+Werkzeug==0.15.3
 widgetsnbextension==2.0.0