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Apple today seeded the first beta of an upcoming OS X 10.11.3 El Capitan update to developers for testing purposes



From MacRumors:
The new OS X 10.11.3 beta, build 15D9c, can be downloaded through the Apple Developer Center.

It is not known what improvements the third update to OS X El Capitan will bring, but like prior updates, it's likely to focus on security enhancements, performance improvements, and bug fixes to address issues have been discovered since the release of OS X 10.11.2.
  Apple Seeds First OS X 10.11.3 El Capitan Beta to Developers