Apple today seeded the third beta of an upcoming macOS Sierra 10.12.5 update to developers, one week after seeding the second beta and three weeks after releasing macOS Sierra 10.12.4, which introduced Night Shift for the Mac.

The third beta of macOS Sierra 10.12.5 can be downloaded through the Apple Developer Center or through the Software Update mechanism in the Mac App Store.

According to the release notes accompanying the beta, the update "improves the stability, compatibility, and security of your Mac."

Apple's release notes don't often provide a lot of insight into what's included in new beta software, so we don't know what features or bug fixes might be included in the 10.12.5 update.

No notable changes or major bug fixes were discovered in the first two betas, but should anything pop up in the third macOS Sierra 10.12.5 beta, we'll update this post.

Update: Beta 3 is also out for public beta testers.