google-auth >= 1.1.0
google-cloud-core[grpc] >= 0.28.0, < 0.29dev
google-api-core >= 0.1.1, < 0.2.0dev
google-gax >= 0.15.15, < 0.16dev
grpc-google-iam-v1 >= 0.11.4, < 0.12dev
requests >= 2.18.4, < 3.0dev
