diff --git a/docs/CHANGES.rst b/docs/CHANGES.rst
index e6c873f..290ba09 100644
--- a/docs/CHANGES.rst
+++ b/docs/CHANGES.rst
@@ -1,6 +1,12 @@
 Change history
 **************
 
+0.21 (unreleased)
+=================
+
+- Nothing changed yet.
+
+
 0.20 (2015-10-06)
 =================
 
diff --git a/setup.py b/setup.py
index 89c84fe..d0df599 100644
--- a/setup.py
+++ b/setup.py
@@ -11,7 +11,7 @@
 def read(*rnames):
     return open(os.path.join(os.path.dirname(__file__), *rnames)).read()
 
-version = '0.20'
+version = '0.21.dev0'
 
 long_description = (
     read('README.rst') + '\n\n' +