diff --git a/samples/api-client/manager/requirements.txt b/samples/api-client/manager/requirements.txt
index 15b1e891..63856825 100644
--- a/samples/api-client/manager/requirements.txt
+++ b/samples/api-client/manager/requirements.txt
@@ -4,6 +4,6 @@ google-api-python-client==1.8.2
 google-auth-httplib2==0.0.3
 google-auth==1.14.2
 google-cloud-iot==1.0.0
-google-cloud-pubsub==1.4.2
+google-cloud-pubsub==1.4.3
 paho-mqtt==1.5.0
 pyjwt==1.7.1