Apple releases OS X El Capitan 10.11.3, this upgrade has bug fixes, stability & security improvements for your Mac.
The OS X El Capitan 10.11.3 update improves the stability, compatibility, and security of your Mac. This update is recommended for all OS X El Capitan users.
Changes on OS X El Capitan 10.11.3:
• Fixes an issue that may prevent some Mac computers from waking from sleep when connected to certain 4K displays.
The update of OS X El Capitan 10.11.3 is available on the App Store of your Mac.