diff --git a/src/python/requirements.txt b/src/python/requirements.txt
index d32d436d3c4..43395df03b9 100644
--- a/src/python/requirements.txt
+++ b/src/python/requirements.txt
@@ -1,3 +1,3 @@
 enum34==1.0.4
 futures==2.2.0
-protobuf==3.0.0a2
+protobuf==3.0.0a3
diff --git a/src/python/src/setup.py b/src/python/src/setup.py
index dc655a70f91..5398b099360 100644
--- a/src/python/src/setup.py
+++ b/src/python/src/setup.py
@@ -86,13 +86,13 @@ _PACKAGE_DIRECTORIES = {
 
 setuptools.setup(
     name='grpcio',
-    version='0.9.0a0',
+    version='0.9.0a1',
     ext_modules=[_EXTENSION_MODULE],
     packages=list(_PACKAGES),
     package_dir=_PACKAGE_DIRECTORIES,
     install_requires=[
         'enum34==1.0.4',
         'futures==2.2.0',
-        'protobuf==3.0.0a2'
+        'protobuf==3.0.0a3'
     ]
 )