Apple on Tuesday released an update for macOS High Sierra. According to Apple’s release notes, macOS High Sierra 10.13.3 fixes a problem in Messages where your conversation is listed out of order. It also has a fix for an issue that causes your Mac to stop responding when connected to an SMB server.
Version 10.13.3 is available through the Mac App Store; when you launch the App Store app, click on the Updates tab at the top of the app. You can press Command-R or select Store > Reload Page if you don’t see the update. The installation will require you Mac to restart.
macOS High Sierra 10.13.3 also includes several important security updates, which are detailed here. Of note are more fixes for the Meltdown and Spectre bugs in Intel processors that were reported earlier. Apple initally released Meltdown and Spectre fixes in macOS High Sierra 10.13.2.
Apple also released an update to iTunes for the Mac. Version 12.7.3 is now available through the App Store. Based on the release notes, you may not need to rush to install this update; Apple says it includes support fro the HomePod, which doesn't go on sale until this Friday and won't ship until February 9.