diff --git a/CHANGELOG.md b/CHANGELOG.md
index 22c8d1559..74a37466f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,13 @@ All notable changes to this package will be documented in this file.
 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).
 
+## [2.4.0-exp] - 2023-09-08
+- fix: improvements to light color and value export
+- fix: light import color space
+- fix: sanitize alpha cutoff value before writing
+- fix: convert light and material color spaces when exporting for animation
+- add: allow choice between implicit and explicit queue and surface type control (experimental)
+
 ## [2.3.1-exp] - 2023-08-26
 - fix: restore ShouldExportTransform functionality on latest dev branch
 
diff --git a/package.json b/package.json
index 51114346b..7e83b9357 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "org.khronos.unitygltf",
   "displayName": "UnityGLTF",
-  "version": "2.3.1-exp",
+  "version": "2.4.0-exp",
   "unity": "2020.3",
   "description": "Unity3D library for importing and exporting GLTF 2.0 assets. https://github.com/KhronosGroup/UnityGLTF",
   "repository": {