Apple today seeded the second beta of an upcoming OS X 10.11.5 update to public beta testers, just one day after releasing the second OS X 10.11.5 beta to developers and a month after releasing OS X 10.11.4, the fourth update to the OS X 10.11 operating system.
The second beta of OS X 10.11.5 is available through the Software Update mechanism in the Mac App Store for those who are enrolled in Apple's beta testing program. Those who want 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 discovered in the first two developer betas.