Merge branch 'master' of https://github.com/grpc/grpc into upmerge-from-v1.7

1 files changed, 1 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index 65aa02f4e1..821fda504a 100644
--- a/setup.py
+++ b/setup.py
@@ -237,7 +237,7 @@ INSTALL_REQUIRES = (
     'six>=1.5.2',
     # TODO(atash): eventually split the grpcio package into a metapackage
     # depending on protobuf and the runtime component (independent of protobuf)
-    'protobuf>=3.3.0',
+    'protobuf>=3.5.0.post1',
 )
 
 if not PY3: