Apple has seeded the fourth beta of OS X El Capitan 10.11.5 to developers. This follows the release of the fourth build of iOS 9.3.2 and the launch of the third beta of the software update for Macs which happened last week.
Apple hasn’t included any major user-facing changes in OS X 10.11.5, resulting in very small update packages. The usual bug fixes, security and speed improvements, and stability patches can, however, be found in the build.
Visiting the Mac App Store’s “Updates” tab will allow you to download the latest beta of OS X. We’ll update this post if there’s anything notably different in the build.