Apple today seeded the fourth beta of OS X 10.11.5 to developers. This comes one week after the last update. 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.
To get this update, developers can go to the Mac App Store and get the latest build. If 10.11.5 isn’t installed, it can be downloaded from the Apple Developer Center.