macOS Sierra 10.12.1
The macOS Sierra 10.12.1 update improves the stability, compatibility, and security of your Mac, and is recommended for all users.
Security & Development
The macOS Sierra 10.12.1 update improves the stability, compatibility, and security of your Mac, and is recommended for all users.
This update includes stability and performance improvements.
Yesterday DomainTools experienced a high volume user email harvesting campaign which abused a flaw in our individual membership email update processes.
From Apple