diff --git a/CHANGES.rst b/CHANGES.rst
index 8b680e0..64da016 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,12 @@
 Products.CMFCore Changelog
 ==========================
 
+3.4 (unreleased)
+----------------
+
+- Nothing changed yet.
+
+
 3.3 (2024-01-23)
 ----------------
 
diff --git a/setup.py b/setup.py
index 041e9af..845d562 100644
--- a/setup.py
+++ b/setup.py
@@ -21,7 +21,7 @@ def _package_doc(name):
 ])
 
 setup(name='Products.%s' % NAME,
-      version='3.3',
+      version='3.4.dev0',
       description='Zope Content Management Framework core components',
       long_description=README,
       classifiers=[