Beta testers who have signed up for Apple's Beta testing program will receive the 10.12.5 macOS Sierra Beta through the Software Update mechanism in the Mac App Store.
Those who want to be a part of Apple's Beta testing program can sign up to participate through the beta testing website, which gives users access to both iOS and macOS Sierra betas. Betas should **t be installed on a primary machine due to the potential for instability.
The release **tes accompanying the developer Beta say the update "improves the stability, compatibility, and security of your Mac."
There's **t much to glean from Apple's release **tes, so it is **t clear what mi**r feature tweaks or bug fixes might be included in 10.12.5. **thing **table has been discovered in the developer betas thus far.