diff --git a/CHANGES.rst b/CHANGES.rst
index 95d1840..4f196fa 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,8 +1,8 @@
 Changelog
 =========
 
-2.4.21 (unreleased)
--------------------
+3.0.0 (unreleased)
+------------------
 
 Breaking changes:
 
diff --git a/setup.py b/setup.py
index 4d2cf5e..e26cb03 100644
--- a/setup.py
+++ b/setup.py
@@ -1,7 +1,7 @@
 from setuptools import find_packages
 from setuptools import setup
 
-version = '2.4.21.dev0'
+version = '3.0.0.dev0'
 
 install_requires = [
     'setuptools',