diff --git a/requirements.txt b/requirements.txt
index e404f38..06f731e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ defusedxml==0.5.0
 Django==2.1.2
 django-bootstrap4==0.0.6
 django-sslserver==0.20
-gunicorn==19.9.0
+gunicorn==21.2.0
 idna==2.7
 oauthlib==2.1.0
 psycopg2==2.7.5