diff --git a/app/requirements.txt b/app/requirements.txt
index 941ae90..176752e 100644
--- a/app/requirements.txt
+++ b/app/requirements.txt
@@ -9,7 +9,7 @@ click==6.7
 docutils==0.13.1
 enum34==1.1.6
 Flask==0.12
-gunicorn==19.6.0
+gunicorn==22.0.0
 imagesize==0.7.1
 itsdangerous==0.24
 Jinja2==2.9.5