diff --git a/requirements.txt b/requirements.txt
index f07fb6d81..92612e533 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,7 +25,7 @@ Flask-Script==2.0.5
 Flask-Security==3.0.0
 Flask-SQLAlchemy==2.3.2
 Flask-WTF==1.0.0
-gunicorn==20.1.0
+gunicorn==21.1.0
 gevent==1.4.0
 greenlet==0.4.17
 htmlmin==0.1.12