diff --git a/CHANGELOG.md b/CHANGELOG.md
index 145f9e7..7630adb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,7 @@
 ## Unreleased
 
+## 4.0.0
+
 * Removal: `Scalingo::Client#agora_fr1` had been removed since the region no longer exists.
 * New: Add `addons#authenticate!` endpoint
 * New API: database API
diff --git a/lib/scalingo/version.rb b/lib/scalingo/version.rb
index 1237e05..52e4d95 100644
--- a/lib/scalingo/version.rb
+++ b/lib/scalingo/version.rb
@@ -1,3 +1,3 @@
 module Scalingo
-  VERSION = "3.1.0"
+  VERSION = "4.0.0"
 end