diff --git a/python/vmaf/__init__.py b/python/vmaf/__init__.py
index 54ccbac39..3fc7a0d20 100644
--- a/python/vmaf/__init__.py
+++ b/python/vmaf/__init__.py
@@ -4,7 +4,7 @@
 
 __copyright__ = "Copyright 2016-2020, Netflix, Inc."
 __license__ = "BSD+Patent"
-__version__ = "3.0.0"
+__version__ = "4.0.0"
 
 logging.basicConfig()
 logger = logging.getLogger(os.path.splitext(os.path.basename(__file__))[0])