diff --git a/requirements.txt b/requirements.txt
index 544fbe9..81893e6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,4 +18,4 @@ pycodestyle==2.3.1        # via flake8
 pyflakes==1.6.0
 requests==2.18.4
 urllib3==1.22
-werkzeug==0.13            # via flask
+werkzeug==0.15.3          # via flask