macOS 10.13.6 was an update to macOS 10.13 (High Sierra) released on August 12, 2018.
- Adds AirPlay 2 multiroom audio support for iTunes and improves the stability and security of your Mac.
- Control your home audio system and AirPlay 2-enabled speakers throughout your house.
- Play music at the same time on multiple AirPlay 2-enabled speakers in your house, all in sync.
Other improvements and fixes:
- Fixes an issue that may prevent Photos from recognizing AVCHD media from some cameras.
- Fixes an issue that may prevent Mail users from moving a message from Gmail to another account.
See Apple Security Updates for detailed information about the security content of this update.
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