Arriving a month after Tails 4.4, this release is the first to offer support for computers that have the Secure Boot security feature enabled in the BIOS. According to the Tails development team, Tails can now boot on computers with Secure Boot enabled, including Macs. But if you get the error ???Security settings do not allow this Mac to use an external startup disk??? you must change the settings of your Mac???s Startup Security Utility to authorize Tails.