diff --git a/CHANGES.rst b/CHANGES.rst
index c1cb844..ac3ed22 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,12 @@
 Changelog
 =========
 
+2.4.3 (unreleased)
+------------------
+
+- Nothing changed yet.
+
+
 2.4.2 (2015-05-04)
 ------------------
 
diff --git a/setup.py b/setup.py
index 3566c5a..c41cfbd 100644
--- a/setup.py
+++ b/setup.py
@@ -1,7 +1,7 @@
 from setuptools import find_packages
 from setuptools import setup
 
-version = '2.4.2'
+version = '2.4.3.dev0'
 
 install_requires = [
     'setuptools',