diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 4246558a..75c1ed35 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -3,6 +3,12 @@ Changelog
 
 This document describes changes between each past release.
 
+4.1 (unreleased)
+----------------
+
+- Nothing changed yet.
+
+
 4.0 (2019-01-24)
 ----------------
 
diff --git a/setup.py b/setup.py
index aadefcfc..ea1c668c 100644
--- a/setup.py
+++ b/setup.py
@@ -34,7 +34,7 @@ ENTRY_POINTS = {
 
 
 setup(name='ihatemoney',
-      version='4.0',
+      version='4.1.dev0',
       description='A simple shared budget manager web application.',
       long_description="{}\n\n{}".format(README.encode('utf-8'), CHANGELOG.encode('utf-8')),
       license='Custom BSD Beerware',