diff --git a/explainer/requirements.txt b/explainer/requirements.txt
index 87a0f3e..9b0079a 100644
--- a/explainer/requirements.txt
+++ b/explainer/requirements.txt
@@ -84,6 +84,6 @@ traitlets==4.3.2
 typed-ast==1.4.0
 wcwidth==0.1.7
 webencodings==0.5.1
-Werkzeug==0.15.4
+Werkzeug==0.15.5
 widgetsnbextension==3.5.0
 wrapt==1.11.2