diff --git a/caldav/__init__.py b/caldav/__init__.py
index 20fead76..9d7ffb5f 100644
--- a/caldav/__init__.py
+++ b/caldav/__init__.py
@@ -3,7 +3,7 @@
 
 import vobject.icalendar
 
-__version__ = "0.12.0.dev0"
+__version__ = "1.0.0.dev0"
 
 from .davclient import DAVClient
 from .objects import *