diff --git a/CHANGES.rst b/CHANGES.rst
index 4c844c7..a19b433 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,22 @@
 Changelog
 =========
 
+4.0.6 (unreleased)
+------------------
+
+Breaking changes:
+
+- *add item here*
+
+New features:
+
+- *add item here*
+
+Bug fixes:
+
+- *add item here*
+
+
 4.0.5 (2020-03-21)
 ------------------
 
diff --git a/src/icalendar/__init__.py b/src/icalendar/__init__.py
index 3d22398..0cc5e7f 100644
--- a/src/icalendar/__init__.py
+++ b/src/icalendar/__init__.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-__version__ = '4.0.5'
+__version__ = '4.0.6.dev0'
 
 from icalendar.cal import (
     Calendar,