diff --git a/CHANGELOG b/CHANGELOG
index 22d35272f5..93356a46be 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,5 @@
+Version 4.0.0 - 2016-05-02
+* Bug fixes (see mercurial logs for details)
 * Add sendmail module to send transactional email
 * Support Two-Phase Commit in Transaction
 * Allow Report to generate text plain, XML, HTML and XHTML
diff --git a/COPYRIGHT b/COPYRIGHT
index f778918e33..dea04624a6 100644
--- a/COPYRIGHT
+++ b/COPYRIGHT
@@ -1,7 +1,7 @@
 Copyright (C) 2004-2008 Tiny SPRL.
-Copyright (C) 2007-2015 Cédric Krier.
+Copyright (C) 2007-2016 Cédric Krier.
 Copyright (C) 2007-2013 Bertrand Chenal.
-Copyright (C) 2008-2015 B2CK SPRL.
+Copyright (C) 2008-2016 B2CK SPRL.
 Copyright (C) 2011 Openlabs Technologies & Consulting (P) Ltd.
 Copyright (C) 2011-2016 Nicolas Évrard.
 
diff --git a/doc/conf.py b/doc/conf.py
index cac3f2a6cf..520e241ad5 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 = '3.9'
+version = '4.0'
 # The full version, including alpha/beta/rc tags.
-release = '3.9'
+release = '4.0'
 
 # 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 cc8c45be19..44be7275df 100644
--- a/trytond/__init__.py
+++ b/trytond/__init__.py
@@ -5,7 +5,7 @@ import time
 import logging
 from email import charset
 
-__version__ = "3.9.0"
+__version__ = "4.0.0"
 logger = logging.getLogger(__name__)
 
 os.environ['TZ'] = 'UTC'