diff --git a/run/pubsub/requirements.txt b/run/pubsub/requirements.txt
index 6f6ed83dd78..bba3ed2a150 100644
--- a/run/pubsub/requirements.txt
+++ b/run/pubsub/requirements.txt
@@ -1,3 +1,3 @@
 Flask==1.0.2
 pytest==4.3.1
-gunicorn==19.9.0
+gunicorn==22.0.0