Apple has released macOS High Sierra 10.13.5 as a free upgrade for the Mac. This comes after the software was in beta stages for a few weeks.
As far as what’s new, macOS 10.13.5 includes support for Messages in iCloud that lets you store all of your messages in the app and sync them across your devices. There’s also multiple bug and stability fixes.
To install the upgrade, head over to the “Updates” tab in the App Store and check for updates. There, you’ll find the new build ready to install. Just click the “Update” button next to the macOS High Sierra 10.13.5 listing and restart your Mac. The process may take a little while, so be patient and don’t turn off your Mac manually if you don’t have to.