diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 5674c5a..0626f54 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,4 +1,10 @@
 
+0.5.0 (unreleased)
+------------------
+
+- Nothing changed yet.
+
+
 0.4.2 (2017-03-01)
 ------------------
 
diff --git a/setup.py b/setup.py
index 1bc74b1..b44df5f 100644
--- a/setup.py
+++ b/setup.py
@@ -10,7 +10,7 @@
 with open(path.join(here, 'README.rst'), encoding='utf-8') as f:
     long_description = f.read()
 
-version = '0.4.2'
+version = '0.5.0.dev0'
 
 setup(
     name='mariobros',