diff --git a/src/python/src/setup.py b/src/python/src/setup.py
index 7149a9eb859..76750496776 100644
--- a/src/python/src/setup.py
+++ b/src/python/src/setup.py
@@ -86,7 +86,7 @@ _PACKAGE_DIRECTORIES = {
 
 setuptools.setup(
     name='grpcio',
-    version='0.5.0a0',
+    version='0.5.0a1',
     ext_modules=[_EXTENSION_MODULE],
     packages=list(_PACKAGES),
     package_dir=_PACKAGE_DIRECTORIES,