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 detailed information about this update, please visit: https://support.apple.com/kb/HT208179
For detailed information about the security content of this update, please visit: https://support.apple.com/kb/HT201222
You can install the update by visiting the Updates tab in the Mac App Store.