diff --git a/CHANGES.rst b/CHANGES.rst
index 32e4f94b..ef755a75 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -2,6 +2,12 @@
  Changes
 =========
 
+6.3 (unreleased)
+================
+
+- Nothing changed yet.
+
+
 6.2 (2024-02-16)
 ================
 
diff --git a/setup.py b/setup.py
index 2ecc5740..41e9b21d 100644
--- a/setup.py
+++ b/setup.py
@@ -100,7 +100,7 @@ def read(*rnames):
         )
 
 setup(name='zope.interface',
-      version='6.2',
+      version='6.3.dev0',
       url='https://github.com/zopefoundation/zope.interface',
       license='ZPL 2.1',
       description='Interfaces for Python',