diff --git a/CHANGES.rst b/CHANGES.rst
index 4bc3b65..fb7a3d9 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,10 @@
 CHANGES
 =======
 
+4.0.1 (unreleased)
+------------------
+- No changes yet
+
 4.0.0 (2019-12-11)
 ------------------
 - Remove hacks for previously supported Django versions. (Fixes GH-390)
diff --git a/model_utils/__init__.py b/model_utils/__init__.py
index 5661ac1..0275e64 100644
--- a/model_utils/__init__.py
+++ b/model_utils/__init__.py
@@ -1,4 +1,4 @@
 from .choices import Choices  # noqa:F401
 from .tracker import FieldTracker, ModelTracker  # noqa:F401
 
-__version__ = '4.0.0'
+__version__ = '4.0.1'