diff --git a/requirements.txt b/requirements.txt
index ad1c9de36..4441358aa 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ filelock
 google-api-core
 google-cloud-datastore
 google-api-python-client
-google-cloud-pubsub==1.4.2
+google-cloud-pubsub
 google-cloud-storage
 google-cloud-core
 oauth2client