A description of what changes Homebrew needed to make to get working on macOS 11 Big Sur and what work we've done and are doing to support a new CPU architecture for the first time since Snow Leopard. Providing details of the biggest changes that Homebrew users have been excited about in the last year: support for Big Sur and the ongoing work for ARM. Provide technical details on what's required for us to support a new operating system from Apple and what the entire Homebrew ecosystem needs to do/change in order to support a new architecture. Nearer the time we'll also be able to provide a status report on how near we are to "official" support.