diff --git a/CHANGES.rst b/CHANGES.rst
index f66f657..eaa17aa 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,22 @@
 Changelog
 =========
 
+2.4.21 (unreleased)
+-------------------
+
+Breaking changes:
+
+- *add item here*
+
+New features:
+
+- *add item here*
+
+Bug fixes:
+
+- *add item here*
+
+
 2.4.20 (2017-01-17)
 -------------------
 
diff --git a/setup.py b/setup.py
index a40b9c7..4d2cf5e 100644
--- a/setup.py
+++ b/setup.py
@@ -1,7 +1,7 @@
 from setuptools import find_packages
 from setuptools import setup
 
-version = '2.4.20'
+version = '2.4.21.dev0'
 
 install_requires = [
     'setuptools',