diff --git a/requirements.txt b/requirements.txt
index 5a207d0..4aa31e9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -63,5 +63,5 @@ tornado==6.0.1
 traitlets==4.3.2
 wcwidth==0.1.7
 webencodings==0.5.1
-Werkzeug==0.15.3
+Werkzeug==0.15.5
 widgetsnbextension==3.4.2