diff --git a/CHANGES.rst b/CHANGES.rst
index d2a8f5b..04b0d17 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,9 @@
 CHANGES
 =======
 
+master (unreleased)
+-------------------
+
 2.2 (2014.07.31)
 ----------------
 
diff --git a/model_utils/__init__.py b/model_utils/__init__.py
index 15f1a77..6161543 100644
--- a/model_utils/__init__.py
+++ b/model_utils/__init__.py
@@ -1,4 +1,4 @@
 from .choices import Choices
 from .tracker import FieldTracker, ModelTracker
 
-__version__ = '2.2'
+__version__ = '2.3a1'