diff --git a/CHANGES.rst b/CHANGES.rst
index a336ded..ac0078e 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,9 +1,13 @@
 CHANGES
 =======
 
-2.5.1 (2016.08.03)
+master (unreleased)
 -------------------
 
+
+2.5.1 (2016.08.03)
+------------------
+
 * Fix `InheritanceQuerySet` raising an `AttributeError` exception
   under Django 1.9.
 
diff --git a/model_utils/__init__.py b/model_utils/__init__.py
index 68ca7d4..5cb8526 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__ = '2.5.1'
+__version__ = '2.5.2a1'