Apple today seeded the third beta of an upcoming OS X 10.11.5 El Capitan update to developers, one week after releasing the second OS X 10.11.5 beta and a month after releasing OS X 10.11.4, the fourth update to the OS X El Capitan operating system. OS X 10.11.5 has been in testing since April 6.
OS X 10.11.5 beta 3 has a build number of 15F28b and can be downloaded through the software update mechanism in the Mac App Store or through the Apple Developer Center.
OS X 10.11.5, like prior OS X El Capitan updates, appears to focus on security enhancements, performance improvements, and bug fixes to address issues that have popped up since the release of OS X 10.11.4. No obvious outward-facing changes were discovered in the first two OS X 10.11.5 betas, but we’ll update this post if any new features are found in the third beta.
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Source: MAC ROUMORS