Automattic developers have just released the new version of WordPress 4.9.3: This version of the popular CMS (from the content management system) is a maintenance version and comes to fix 34 bugs of 4.9.
These include fixes to Customizer change settings, widgets, and the visual editor. The new version also offers compatibility with the new PHP 7.2.
WordPress 4.9.3 as mentioned above contains 34 bug fixes, which you can see in detail in the release notes.
Of course, as with any updates, you'll need to upgrade immediately, either by downloading it application from the official website, or from your admin panel in automatic mode.
Before proceeding with the upgrade, it would be a good idea to get a full backup.