diff --git a/requirements.txt b/requirements.txt
index 035f3f7..0d5aa02 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -53,5 +53,5 @@ tornado==6.0.2
 traitlets==4.3.2
 wcwidth==0.1.7
 webencodings==0.5.1
-Werkzeug==0.15.4
+Werkzeug==0.15.5
 widgetsnbextension==3.4.2