diff --git a/requirements.txt b/requirements.txt
index d2f8aee..a9abc87 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ Flask-Cors==3.0.9
 flask-nav==0.6
 Flask-RESTful==0.3.7
 Flask-WTF==0.14.2
-gunicorn==19.9.0
+gunicorn==21.2.0
 idna==2.8
 itsdangerous==1.1.0
 Jinja2>=2.10.1