diff --git a/homeassistant/const.py b/homeassistant/const.py
index 3688aa0dc17..4109b32a263 100644
--- a/homeassistant/const.py
+++ b/homeassistant/const.py
@@ -1,7 +1,7 @@
 # coding: utf-8
 """ Constants used by Home Assistant components. """
 
-__version__ = "0.12.0"
+__version__ = "0.13.0.dev0"
 
 # Can be used to specify a catch all when registering state or event listeners.
 MATCH_ALL = '*'