diff --git a/CHANGES.txt b/CHANGES.txt
index 3eefd576a..d269dfa43 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,8 +1,8 @@
 CHANGES
 =======
 
-Unreleased
-----------
+4.0.0 (2013-08-18)
+------------------
 
 - Avoid reading excess random bytes when setting up an auth_digest session.
 
diff --git a/setup.py b/setup.py
index 3ff3c464e..147490300 100644
--- a/setup.py
+++ b/setup.py
@@ -13,6 +13,7 @@
 ##############################################################################
 """Setup
 """
+version = '4.0.0'
 from setuptools import setup, find_packages
 import os
 import sys
@@ -98,7 +99,7 @@ def emit(self, record):
     open('CHANGES.txt').read()
     )
 setup(name="ZEO",
-      version='4.0.0b1',
+      version=version,
       description = long_description.split('\n', 2)[1],
       long_description = long_description,
       url = 'https://pypi.python.org/pypi/ZEO',