diff --git a/CHANGELOG b/CHANGELOG
index c4e2647..bcc307e 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,4 @@
+Version 4.0.0 - 2016-05-03
 Version 3.4.0 - 2014-11-05
 
 Version 2.6.0 - 2012-10-30
diff --git a/tryton.cfg b/tryton.cfg
index 0e50a84..40c22a8 100644
--- a/tryton.cfg
+++ b/tryton.cfg
@@ -1,5 +1,5 @@
 [tryton]
-version=3.9.0
+version=4.0.0
 depends:
     ir
     res