diff --git a/src/calibre/constants.py b/src/calibre/constants.py
index 319b01f887..2a6736d58e 100644
--- a/src/calibre/constants.py
+++ b/src/calibre/constants.py
@@ -2,7 +2,7 @@ __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
 __docformat__ = 'restructuredtext en'
 __appname__   = 'calibre'
-__version__   = '0.6.0b3'
+__version__   = '0.6.0b4'
 __author__    = "Kovid Goyal <kovid@kovidgoyal.net>"
 
 import re