macOS High Sierra 10.13.2 Combo Update
The macOS High Sierra 10.13.2 update improves the stability, compatibility and security of your Mac, and is recommended for all users.
• Improves compatibility with certain third-party USB audio devices
• Improves VoiceOver navigation when viewing PDF documents in Preview
• Improves compatibility of Braille displays with Mail
For more information on the security content of Apple software updates, please visit this website: https://support.apple.com/en-us/HT201222