diff --git a/samples/api-client/manager/requirements.txt b/samples/api-client/manager/requirements.txt
index 042e9137..67de39bd 100644
--- a/samples/api-client/manager/requirements.txt
+++ b/samples/api-client/manager/requirements.txt
@@ -2,7 +2,7 @@ cryptography==2.9.2
 flaky==3.7.0
 google-api-python-client==1.9.3
 google-auth-httplib2==0.0.4
-google-auth==1.18.0
+google-auth==1.19.0
 google-cloud-iot==1.0.0
 google-cloud-pubsub==1.6.1
 paho-mqtt==1.5.0