diff --git a/api/v2alpha1/python/setup.py b/api/v2alpha1/python/setup.py
index a6a98656cfa2..14be4897d94b 100644
--- a/api/v2alpha1/python/setup.py
+++ b/api/v2alpha1/python/setup.py
@@ -15,7 +15,7 @@
 import setuptools
 
 NAME = 'kfp-pipeline-spec'
-VERSION = '0.3.0'
+VERSION = '0.4.0'
 
 setuptools.setup(
     name=NAME,