diff --git a/CHANGES.rst b/CHANGES.rst
index f632e95..7444862 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -3,8 +3,8 @@ Changelog
 
 For changes before version 3.0, see ``HISTORY.rst``.
 
-4.0 (unreleased)
-----------------
+4.0a4 (2017-02-01)
+------------------
 
 - Use `@implementer` class decorator.
 
diff --git a/setup.py b/setup.py
index 2f8312e..e3fbcc4 100644
--- a/setup.py
+++ b/setup.py
@@ -38,7 +38,7 @@
                      join('include', 'Acquisition', 'Acquisition.h')]),
     ]
 
-__version__ = '4.0a4.dev0'
+__version__ = '4.0a4'
 
 setup(name='AccessControl',
       version=__version__,