diff --git a/ws2812b_heroku/server/requirements.txt b/ws2812b_heroku/server/requirements.txt
index b97d442..842d006 100644
--- a/ws2812b_heroku/server/requirements.txt
+++ b/ws2812b_heroku/server/requirements.txt
@@ -6,6 +6,6 @@ gevent-websocket==0.10.1
 greenlet==0.4.15
 gunicorn==19.9.0
 ItsDangerous==1.0.0
-Jinja2==2.10.1
+Jinja2==2.11.3
 MarkupSafe==1.0
 Werkzeug==0.16.0