diff --git a/websocket_server/requirements.txt b/websocket_server/requirements.txt
index d343437..3078139 100644
--- a/websocket_server/requirements.txt
+++ b/websocket_server/requirements.txt
@@ -18,7 +18,7 @@ gunicorn==20.0.4
 httplib2==0.18.0
 idna==2.9
 itsdangerous==1.1.0
-Jinja2==2.11.2
+Jinja2==2.11.3
 MarkupSafe==1.1.1
 numpy==1.14.5
 oauth2client==4.1.3