diff --git a/homeassistant/const.py b/homeassistant/const.py
index a720c989907..ce46c62850b 100644
--- a/homeassistant/const.py
+++ b/homeassistant/const.py
@@ -1,7 +1,7 @@
 # coding: utf-8
 """Constants used by Home Assistant components."""
 
-__version__ = '0.27.1'
+__version__ = '0.28.0.dev0'
 REQUIRED_PYTHON_VER = (3, 4)
 
 PLATFORM_FORMAT = '{}.{}'