diff --git a/CHANGES.rst b/CHANGES.rst
index cb2a32c..3425d41 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -2,7 +2,7 @@
  Changelog
 ===========
 
-4.0 (unreleased)
+4.0 (2024-05-30)
 ================
 
 - Drop support for Python 3.7.
diff --git a/setup.py b/setup.py
index 41ff5b9..8a7c70b 100644
--- a/setup.py
+++ b/setup.py
@@ -45,7 +45,7 @@ def read(fname):
 
 setup(
     name='zodbpickle',
-    version='3.4.dev0',
+    version='4.0',
     description='Fork of Python 3 pickle module.',
     author='Python and Zope Foundation',
     author_email='zodb-dev@zope.dev',
@@ -63,6 +63,7 @@ def read(fname):
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
+        'Programming Language :: Python :: 3.13',
         'Programming Language :: Python :: Implementation :: CPython',
         'Programming Language :: Python :: Implementation :: PyPy',
         'Framework :: ZODB',