diff --git a/CHANGES.rst b/CHANGES.rst
index 487b24e..461e409 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -3,6 +3,12 @@
  Changes
 =========
 
+5.0.1 (unreleased)
+==================
+
+- Nothing changed yet.
+
+
 5.0.0 (2024-06-11)
 ==================
 
diff --git a/setup.py b/setup.py
index 3cdb5b9..3a1e573 100755
--- a/setup.py
+++ b/setup.py
@@ -1,7 +1,7 @@
 import codecs
 from setuptools import setup, find_packages
 
-version = '5.0.0'
+version = '5.0.1.dev0'
 
 entry_points = {
     'console_scripts': [