diff --git a/CHANGELOG b/CHANGELOG
index 502f69d315..c6dc6454de 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,5 @@
+Version 4.0.0 - 2016-05-02
+* Bug fixes (see mercurial logs for details)
 * Add Python3 support
 
 Version 3.8.0 - 2015-11-02
diff --git a/COPYRIGHT b/COPYRIGHT
index 34d418767f..808b71b02c 100644
--- a/COPYRIGHT
+++ b/COPYRIGHT
@@ -1,6 +1,6 @@
-Copyright (C) 2008-2015 Cédric Krier.
+Copyright (C) 2008-2016 Cédric Krier.
 Copyright (C) 2008-2012 Bertrand Chenal.
-Copyright (C) 2008-2015 B2CK SPRL.
+Copyright (C) 2008-2016 B2CK SPRL.
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
diff --git a/tryton.cfg b/tryton.cfg
index 98e30f4aa9..d668d21981 100644
--- a/tryton.cfg
+++ b/tryton.cfg
@@ -1,5 +1,5 @@
 [tryton]
-version=3.9.0
+version=4.0.0
 depends:
     account_invoice
     ir