diff --git a/requirements.txt b/requirements.txt
index a94503c..29ace45 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,4 +20,4 @@ simplegeneric==0.8.1
 six==1.10.0
 traitlets==4.3.2
 wcwidth==0.1.7
-Werkzeug==0.15.3
+Werkzeug==0.15.5