Alongside iOS 9.2.1, Apple released today OS X 10.11.3. The release can be downloaded through the Software Update mechanism in the Mac App Store and it’s available to all OS X El Capitan users.
OS X 10.11.3 is a minor incremental update that aims to fix bugs discovered since the launch of OS X 10.11.2 and improve performance.
The OS X El Capitan 10.11.3 update improves the stability, compatibility, and security of your Mac.
This update contains bug fixes and security updates.