macOS Sierra 10.12.5 is a free update for all customers who have a compatible machine. The update can be downloaded using the Software Update function in the Mac App Store.
No feature additions, bug fixes, or other changes were found in macOS Sierra 10.12.5 during the beta testing process, and developers and public beta testers were only told that the update “improves the stability, compatibility, and security of your Mac.” According to Apple’s release notes, the following bug fixes and enhancements are included:
– Fixes an issue where audio may stutter when played through USB headphones
– Enhances compatibility of the Mac App Store with future software updates
– Adds support for media-free installation of Windows 10 Creators Update using Boot Camp
macOS Sierra 10.12.5 will soon be followed by a new version of macOS, which we expect to see introduced at Apple’s June Worldwide Developers Conference. The new version of macOS will be in testing for several months, however, so Apple is likely to continue updating macOS Sierra.