Make ready for release 4.3.1
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 769e71c..e59ab4c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,7 @@
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/) and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [4.3.1] - 2025-07-11
 
 ### Changed