diff --git a/CHANGES.rst b/CHANGES.rst
index df64f70..ce39d76 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -2,6 +2,12 @@
  CHANGES
 =========
 
+4.4.1 (unreleased)
+==================
+
+- Nothing changed yet.
+
+
 4.4.0 (2020-10-16)
 ==================
 
diff --git a/setup.py b/setup.py
index 22f0b89..9e77d98 100644
--- a/setup.py
+++ b/setup.py
@@ -33,7 +33,7 @@ def read(*rnames):
 ]
 
 setup(name='zope.session',
-      version='4.4.0',
+      version='4.4.1.dev0',
       author='Zope Foundation and Contributors',
       author_email='zope-dev@zope.org',
       description='Client identification and sessions for Zope',