Apple Silicon support in the Buildkite Agent

Apple machines with the new ARM-based M1 chip are being delivered to Buildkite customers, and starting from agent 3.26.0 we have an experimental binary that will run natively on these systems.

Users with M1 based hardware can install the native binary by:

• Using Homebrew
• Running our curl install script
• Downloading the darwin-arm64 binary directly from GitHub