このブログでも利用しているブログツール「WordPress」がバージョン4.5.3に自動アップデートされました。
WordPressはマイナーバージョンアップは自動で行われます。
そして例によって、その後、手動でバージョン4.5.3-jaにアップデートしました。
おもにセキュリティアップデートのようです。

WordPress 4.5.3 Maintenance and Security Release

WordPress 4.5.3 is now available. This is a security release for all previous versions and we strongly encourage you to update your sites immediately.

WordPress versions 4.5.2 and earlier are affected by several security issues: redirect bypass in the customizer, reported by Yassine Aboukir; two different XSS problems via attachment names, reported by Jouko Pynnönen and Divyesh Prajapati; revision history information disclosure, reported independently by John Blackbourn from the WordPress security team and by Dan Moen from the Wordfence Research Team; oEmbed denial of service reported by Jennifer Dodd from Automattic; unauthorized category removal from a post, reported by David Herrera from Alley Interactive; password change via stolen cookie, reported by Michael Adams from the WordPress security team; and some less secure sanitize_file_name edge cases reported by Peter Westwood of the WordPress security team.