diff --git a/CHANGES.rst b/CHANGES.rst
index 1fc9a62..0c20f13 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,9 @@
 CHANGES
 =======
 
+master (unreleased)
+-------------------
+
 2.3.1 (2015-07-20)
 ------------------
 
diff --git a/model_utils/__init__.py b/model_utils/__init__.py
index 272f4ca..cb60d23 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__ = '2.3.1'
+__version__ = '2.4a2'