Apple has officially released OS X 10.11.6 El Capitan to the public, bringing along a number of bug fixes. Unfortunately, there's no detailed rundown of what's new just yet, with Apple simply referencing bug fixes and security improvements.
This update comes just two months following the last El Capitan release with OS X 10.11.5. If you'd like to update your Mac, you should be able to download OS X 10.11.6 now. Simply head to the "Updates" section of the Mac App Store now.
Update: Alongside OS X 10.11.6, Apple has also release iTune 12.4.2 with the following minor bug fix:
This update resolves a playback issue with short Apple Music songs in your Up Next queue.