diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8c2b64f8..baf2a28d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,7 +3,7 @@ All notable changes to **DecaLog** are documented in this *changelog*.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and **DecaLog** adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [4.0.0] - Not Yet Released
+## [4.0.0] - 2024-05-13
 
 > **Important note about this version:**
 > - **DecaLog 4 is a transition version to prepare DecaLog 5.**
diff --git a/decalog.php b/decalog.php
index 21f207f5..9519dbbf 100644
--- a/decalog.php
+++ b/decalog.php
@@ -10,7 +10,7 @@
  * Plugin Name:       DecaLog
  * Plugin URI:        https://perfops.one/decalog
  * Description:       Capture and log events, metrics and traces on your site. Make WordPress observable – finally!
- * Version:           3.10.0
+ * Version:           4.0.0
  * Requires at least: 6.2
  * Requires PHP:      8.1
  * Author:            Pierre Lannoy / PerfOps One
diff --git a/init.php b/init.php
index c35aec66..fd69c582 100644
--- a/init.php
+++ b/init.php
@@ -12,7 +12,7 @@
 define( 'DECALOG_PRODUCT_SHORTNAME', 'DecaLog' );
 define( 'DECALOG_PRODUCT_ABBREVIATION', 'decalog' );
 define( 'DECALOG_SLUG', 'decalog' );
-define( 'DECALOG_VERSION', '4.0.0-dev9' );
+define( 'DECALOG_VERSION', '4.0.0' );
 define( 'DECALOG_API_VERSION', '3' );
 define( 'DECALOG_MONOLOG_VERSION', '2.9.3' );
 define( 'DECALOG_CODENAME', '"-"' );
diff --git a/readme.txt b/readme.txt
index 528037af..55cbdc57 100644
--- a/readme.txt
+++ b/readme.txt
@@ -4,7 +4,7 @@ Tags: logs, error reporting, monitoring, tracing, logging
 Requires at least: 6.2
 Requires PHP: 8.1
 Tested up to: 6.5
-Stable tag: 3.10.0
+Stable tag: 4.0.0
 License: GPLv3
 License URI: https://www.gnu.org/licenses/gpl-3.0.html