Merge pull request #6188 from Textualize/bump640

bump

Author: willmcgugan

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
-## [Unreleased]
+## [6.4.0] - 2025-10-22
 
 ### Fixed
 
@@ -3161,6 +3161,7 @@ https://textual.textualize.io/blog/2022/11/08/version-040/#version-040
 - New handler system for messages that doesn't require inheritance
 - Improved traceback handling
 
+[6.4.0]: https://github.com/Textualize/textual/compare/v6.3.0...v6.4.0
 [6.3.0]: https://github.com/Textualize/textual/compare/v6.2.1...v6.3.0
 [6.2.1]: https://github.com/Textualize/textual/compare/v6.2.0...v6.2.1
 [6.2.0]: https://github.com/Textualize/textual/compare/v6.1.0...v6.2.0