diff --git a/CHANGES.rst b/CHANGES.rst
index 319e236..25150f9 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,12 @@
 Changelog
 =========
 
+2.3.1 (unreleased)
+------------------
+
+- Nothing changed yet.
+
+
 2.3.0 (2014-02-22)
 ------------------
 
diff --git a/setup.py b/setup.py
index 73597bc..fe1ab01 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,6 @@
 from setuptools import setup, find_packages
 
-version = '2.3.0'
+version = '2.3.1.dev0'
 
 install_requires = [
     'setuptools',