diff --git a/doc/conf.py b/doc/conf.py
index 8acebdc7d5..7cd90a9035 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -46,9 +46,9 @@ copyright = u'2008-2011,  Anne Krings, Bertrand Chenal, Cédric Krier, \
 # built documents.
 #
 # The short X.Y version.
-version = '3.8'
+version = '3.9'
 # The full version, including alpha/beta/rc tags.
-release = '3.8'
+release = '3.9'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/tryton/__init__.py b/tryton/__init__.py
index 3b7287fed6..46c0db4841 100644
--- a/tryton/__init__.py
+++ b/tryton/__init__.py
@@ -1,3 +1,3 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
-__version__ = "3.8.0"
+__version__ = "3.9.0"