diff --git a/requirements.txt b/requirements.txt
index 05386e93b..7c251e848 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,5 +5,6 @@ setuptools>=21.0.0  # PSF/ZPL
 urllib3>=1.19.1,!=1.21  # MIT
 pyyaml>=3.12  # MIT
 oauth2client>=4.0.0  # Apache-2.0
+google-auth>=1.0.1  # Apache-2.0
 ipaddress>=1.0.17  # PSF
 websocket-client>=0.32.0 # LGPLv2+