Changelog update

Author: puzrin

CHANGELOG.md

@@ -5,6 +5,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## 4.3.0, 3.15.0 - 2026-06-27
+### Security
+- Backported `maxTotalMergeKeys` option.
+
 
 ## [5.2.0] - 2026-06-26
 ### Added