diff --git a/requirements.txt b/requirements.txt
index abdedbd..3bcc5ad 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -160,7 +160,7 @@ traitlets==4.2.2
 unicodecsv==0.14.1
 virtualenv==15.0.3
 wcwidth==0.1.7
-Werkzeug==0.11.4
+Werkzeug==0.15.5
 xlrd==0.9.4
 XlsxWriter==0.8.4
 xlwings==0.7.0