diff --git a/requirements.txt b/requirements.txt
index 90313d0..30b23ae 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 dj-database-url==0.4.1
 Django==1.11.4
-gunicorn==19.6.0
+gunicorn==21.2.0
 whitenoise==2.0.6
 qrcode==5.3
 mailer==0.8.1