diff --git a/docs/HISTORY.txt b/docs/HISTORY.txt
index d9f9747..3bc4a85 100644
--- a/docs/HISTORY.txt
+++ b/docs/HISTORY.txt
@@ -1,6 +1,12 @@
 Changelog
 =========
 
+2.1 (unreleased)
+----------------
+
+- Nothing changed yet.
+
+
 2.1 (2013-01-01)
 ----------------
 
diff --git a/setup.py b/setup.py
index 4f8f221..fd447ee 100644
--- a/setup.py
+++ b/setup.py
@@ -1,7 +1,7 @@
 from setuptools import setup, find_packages
 import os
 
-version = '2.1'
+version = '2.1.dev0'
 
 setup(name='plone.dexterity',
       version=version,