diff --git a/playground_flask/requirements.txt b/playground_flask/requirements.txt
index cfcf890..9cd0c63 100644
--- a/playground_flask/requirements.txt
+++ b/playground_flask/requirements.txt
@@ -11,7 +11,7 @@ Mako==0.9.1
 MarkupSafe==0.18
 SQLAlchemy==0.9.9
 WTForms==1.0.5
-Werkzeug==0.10.4
+Werkzeug==0.15.3
 alembic==0.6.2
 blinker==1.3
 itsdangerous==0.23