diff --git a/app-engine-lab/requirements.txt b/app-engine-lab/requirements.txt
index 635abc2..7c6f9c2 100644
--- a/app-engine-lab/requirements.txt
+++ b/app-engine-lab/requirements.txt
@@ -1,7 +1,7 @@
 Flask>=1.0.0
 google-cloud-datastore==1.4.0
 google-cloud-storage==1.7.0
-gunicorn==19.7.1
+gunicorn==22.0.0
 oauth2client==4.1.2
 Flask-SQLAlchemy==2.3.2
 PyMySQL==0.8.0