WordPress 4.9.3 is available and fixes 34 bugs. Customizer changesets, the visual editor, widgets, and compatibility for PHP 7.2 highlight this release. You can view all of the changes via the changelog or trac tickets. Most sites will update automatically. However, if you want to trigger the update ahead of time or manually update, visit your Dashboard, click the Updates link, and click Update Now.
Source: WP Tavern