diff --git a/samples/api-client/manager/requirements.txt b/samples/api-client/manager/requirements.txt
index c190af9d..6754642c 100644
--- a/samples/api-client/manager/requirements.txt
+++ b/samples/api-client/manager/requirements.txt
@@ -1,4 +1,4 @@
-google-api-python-client==1.6.5
+google-api-python-client==1.6.6
 google-auth-httplib2==0.0.3
 google-auth==1.4.1
 google-cloud==0.32.0