4 files changed, 4 insertions, 4 deletions
diff --git a/src/python/grpcio_health_checking/setup.py b/src/python/grpcio_health_checking/setup.py
index 35c09827ba..db2edae2ce 100644
--- a/src/python/grpcio_health_checking/setup.py
+++ b/src/python/grpcio_health_checking/setup.py
@@ -57,7 +57,7 @@ PACKAGE_DIRECTORIES = {
 }
 
 INSTALL_REQUIRES = (
-    'protobuf>=3.5.2.post1',
+    'protobuf>=3.6.0',
     'grpcio>={version}'.format(version=grpc_version.VERSION),
 )
 
diff --git a/src/python/grpcio_reflection/setup.py b/src/python/grpcio_reflection/setup.py
index 589d0ff556..b4087d87b4 100644
--- a/src/python/grpcio_reflection/setup.py
+++ b/src/python/grpcio_reflection/setup.py
@@ -58,7 +58,7 @@ PACKAGE_DIRECTORIES = {
 }
 
 INSTALL_REQUIRES = (
-    'protobuf>=3.5.2.post1',
+    'protobuf>=3.6.0',
     'grpcio>={version}'.format(version=grpc_version.VERSION),
 )
 
diff --git a/src/python/grpcio_testing/setup.py b/src/python/grpcio_testing/setup.py
index eb480a5464..6ceb1fc5c9 100644
--- a/src/python/grpcio_testing/setup.py
+++ b/src/python/grpcio_testing/setup.py
@@ -29,7 +29,7 @@ PACKAGE_DIRECTORIES = {
 }
 
 INSTALL_REQUIRES = (
-    'protobuf>=3.5.2.post1',
+    'protobuf>=3.6.0',
     'grpcio>={version}'.format(version=grpc_version.VERSION),
 )
 
diff --git a/src/python/grpcio_tests/setup.py b/src/python/grpcio_tests/setup.py
index 1262e48571..74c7705c97 100644
--- a/src/python/grpcio_tests/setup.py
+++ b/src/python/grpcio_tests/setup.py
@@ -41,7 +41,7 @@ INSTALL_REQUIRES = (
     'grpcio>={version}'.format(version=grpc_version.VERSION),
     'grpcio-tools>={version}'.format(version=grpc_version.VERSION),
     'grpcio-health-checking>={version}'.format(version=grpc_version.VERSION),
-    'oauth2client>=1.4.7', 'protobuf>=3.5.2.post1', 'six>=1.10',
+    'oauth2client>=1.4.7', 'protobuf>=3.6.0', 'six>=1.10',
     'google-auth>=1.0.0', 'requests>=2.14.2')
 
 if not PY3: