diff --git a/com.unity.ml-agents/CHANGELOG.md b/com.unity.ml-agents/CHANGELOG.md
index 48c9cccd39..85214a4356 100755
--- a/com.unity.ml-agents/CHANGELOG.md
+++ b/com.unity.ml-agents/CHANGELOG.md
@@ -6,7 +6,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to
 [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [4.0.0] - 2025-08-15
 ### Major Changes
 #### com.unity.ml-agents (C#)
 - Upgraded to Inference Engine 2.2.1 (#6212)
diff --git a/com.unity.ml-agents/Runtime/Academy.cs b/com.unity.ml-agents/Runtime/Academy.cs
index bebb7174e4..973b171ab3 100644
--- a/com.unity.ml-agents/Runtime/Academy.cs
+++ b/com.unity.ml-agents/Runtime/Academy.cs
@@ -107,7 +107,7 @@ public class Academy : IDisposable
         /// Unity package version of com.unity.ml-agents.
         /// This must match the version string in package.json and is checked in a unit test.
         /// </summary>
-        internal const string k_PackageVersion = "3.0.0";
+        internal const string k_PackageVersion = "4.0.0";
 
         const int k_EditorTrainingPort = 5004;
 
diff --git a/com.unity.ml-agents/package.json b/com.unity.ml-agents/package.json
index 012037d361..394fd72689 100755
--- a/com.unity.ml-agents/package.json
+++ b/com.unity.ml-agents/package.json
@@ -1,7 +1,7 @@
 {
   "name": "com.unity.ml-agents",
   "displayName": "ML Agents",
-  "version": "3.0.0",
+  "version": "4.0.0",
   "unity": "6000.0",
   "description": "Use state-of-the-art machine learning to create intelligent character behaviors in any Unity environment (games, robotics, film, etc.).",
   "dependencies": {