diff --git a/doc/conf.py b/doc/conf.py
index 5dd564e66b..4b361dee6e 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -48,9 +48,9 @@ copyright = (u'2008-2011, Bertrand Chenal, Cédric Krier, Ian Wilson, '
 # built documents.
 #
 # The short X.Y version.
-version = '4.8'
+version = '4.9'
 # The full version, including alpha/beta/rc tags.
-release = '4.8'
+release = '4.9'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/trytond/__init__.py b/trytond/__init__.py
index 4f76a14bc6..8c1def00eb 100644
--- a/trytond/__init__.py
+++ b/trytond/__init__.py
@@ -5,7 +5,7 @@ import time
 import warnings
 from email import charset
 
-__version__ = "4.8.0"
+__version__ = "4.9.0"
 
 os.environ['TZ'] = 'UTC'
 if hasattr(time, 'tzset'):