Apple today seeded the fourth beta of an upcoming OS X 10.11.5 El Capitan update to developers and public beta testers, one week after releasing the third OS X 10.11.5 beta and more than a month after releasing OS X 10.11.4, the fourth update to the El Capitan operating system. OS X 10.11.5 has been in testing since April 6.

The fourth beta of OS X 10.11.5 can be downloaded through the software update mechanism in the Mac App Store or through the Apple Developer Center (developers only).



OS X 10.11.5 focuses on security enhancements, performance improvements, and bug fixes to address problems that have surfaced since the release of OS X 10.11.4. As with prior betas, the changes appear to be minor in scope, and no obvious outward-facing tweaks have been discovered in the first three OS X 10.11.5 betas.

We'll update this post if any new features are found in the fourth beta.