diff --git a/README.rst b/README.rst
index 3a7d0dd..47e8312 100644
--- a/README.rst
+++ b/README.rst
@@ -1,7 +1,7 @@
 ========
 billiard
 ========
-:version: 3.6.4.0
+:version: 4.0.0
 
 |build-status-lin| |build-status-win| |license| |wheel| |pyversion| |pyimp|
 
diff --git a/billiard/__init__.py b/billiard/__init__.py
index 23e1894..ef5b13c 100644
--- a/billiard/__init__.py
+++ b/billiard/__init__.py
@@ -21,7 +21,7 @@
 import sys
 from . import context
 
-VERSION = (3, 6, 4, 0)
+VERSION = (4, 0, 0)
 __version__ = '.'.join(map(str, VERSION[0:4])) + "".join(VERSION[4:])
 __author__ = 'R Oudkerk / Python Software Foundation'
 __author_email__ = 'python-dev@python.org'