diff --git a/wordcloud_demo/requirements.txt b/wordcloud_demo/requirements.txt
index 8bc10c9..a1a6739 100644
--- a/wordcloud_demo/requirements.txt
+++ b/wordcloud_demo/requirements.txt
@@ -88,7 +88,7 @@ urllib3==1.22
 virtualenv==15.1.0
 wcwidth==0.1.7
 webencodings==0.5.1
-Werkzeug==0.12.2
+Werkzeug==0.15.3
 win-unicode-console==0.5
 wordcloud==1.3.2
 wrapt==1.10.10