diff --git a/CHANGES.rst b/CHANGES.rst
index 61299de..27e72f8 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -2,7 +2,7 @@
  Changes
 =========
 
-6.3 (unreleased)
+6.3 (2024-04-12)
 ================
 
 - Add preliminary support for Python 3.13 as of 3.13a6.
diff --git a/setup.py b/setup.py
index 41e9b21..9f49ffb 100644
--- a/setup.py
+++ b/setup.py
@@ -100,7 +100,7 @@ def read(*rnames):
         )
 
 setup(name='zope.interface',
-      version='6.3.dev0',
+      version='6.3',
       url='https://github.com/zopefoundation/zope.interface',
       license='ZPL 2.1',
       description='Interfaces for Python',