Apple today seeded the first beta of an upcoming OS X 10.11.5 beta to public beta testers, just a day after releasing the first OS X 10.11.5 beta to developers and two weeks after releasing OS X 10.11.4, the fourth update to the OS X 10.11 operating system.
The new beta is available through the Software Update mechanism in the Mac App Store for those who are enrolled in Apple's beta testing program. Those wishing to join the program can sign up on Apple's beta testing website.
Most of the updates to OS X 10.11 have been minor in scale, and OS X 10.11.5 is no exception. The update appears to focus on under-the-hood bug fixes, security enhancements, and performance improvements with no obvious outward-facing changes.