diff --git a/CHANGELOG b/CHANGELOG
index 24941a80c6..28a2d98bc6 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,6 @@
+Version 4.0.0 - 2016-05-02
+* Bug fixes (see mercurial logs for details)
+
 Version 3.8.0 - 2015-11-02
 * Bug fixes (see mercurial logs for details)
 
diff --git a/COPYRIGHT b/COPYRIGHT
index 1e8c07cdd9..458b81c4a9 100644
--- a/COPYRIGHT
+++ b/COPYRIGHT
@@ -1,6 +1,6 @@
-Copyright (C) 2006-2015 Cédric Krier.
+Copyright (C) 2006-2016 Cédric Krier.
 Copyright (C) 2009-2012 Bertrand Chenal.
-Copyright (C) 2009-2015 B2CK SPRL.
+Copyright (C) 2009-2016 B2CK SPRL.
 Copyright (C) 2008-2012 Udo Spallek.
 Copyright (C) 2008-2011 virtual things.
 
diff --git a/tryton.cfg b/tryton.cfg
index 42937d9718..dc77d03333 100644
--- a/tryton.cfg
+++ b/tryton.cfg
@@ -1,5 +1,5 @@
 [tryton]
-version=3.9.0
+version=4.0.0
 depends:
     ir
     res