diff --git a/CHANGELOG.md b/CHANGELOG.md
index 65a01b30b..09898f9d8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,16 @@
 # Change Log
 All notable changes to this project will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org)
 
+## 4.0.0-dev -
+
+### Added
+
+- Support for PHP 8.4
+
+### Removed
+
+- Support for PHP versions prior to 8.2
+
 ## 3.6.1 - 2024-12-04
 
 ### Added
diff --git a/config/constants.yml b/config/constants.yml
index ab87d9127..0aad33370 100644
--- a/config/constants.yml
+++ b/config/constants.yml
@@ -7,7 +7,7 @@
 ---
 
 # App
-TERMINUS_VERSION: '3.6.1'
+TERMINUS_VERSION: '4.0.0-dev'
 
 # Connectivity
 TERMINUS_HOST:        'terminus.pantheon.io'