diff --git a/CHANGES.rst b/CHANGES.rst
index d317659..b3f548a 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,12 @@
 zope.schema Changelog
 =====================
 
+4.3.3 (unreleased)
+------------------
+
+- Nothing changed yet.
+
+
 4.3.2 (2013-02-24)
 ------------------
 
diff --git a/setup.py b/setup.py
index 66ab66e..2fe464f 100644
--- a/setup.py
+++ b/setup.py
@@ -73,7 +73,7 @@ def emit(self, record):
 TESTS_REQUIRE = ['zope.testing']
 
 setup(name='zope.schema',
-      version='4.3.2',
+      version='4.3.3.dev0',
       url='http://pypi.python.org/pypi/zope.schema',
       license='ZPL 2.1',
       description='zope.interface extension for defining data schemas',