Apple Seeds Second OS X 10.11.6 El Capitan Beta to Developers
Apple today seeded the second beta of an upcoming OS X 10.11.6 El Capitan update to developers for testing purposes, two weeks after releasing the first OS X 10.11.6 beta and three weeks after the public release of OS X 10.11.5.
The OS X 10.11.6 update, build 15G12a, can be downloaded through the Apple Developer Center or the Software Update mechanism in the Mac App Store.

OS X 10.11.6, like OS X 10.11.5 and the El Capitan updates that came before it, appears to focus mainly on performance improvements and bug fixes. According to Apple's release notes for the first beta, OS X 10.11.6 improves the stability, compatibility, and security of Macs.
No outward-facing bug fixes or changes were found in the first beta but we'll update this post if any new features are discovered in the second beta.
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