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.
For more detailed information about this update, please visit: https://support.apple.com/kb/HT205356.
For detailed information about the security content of this update, please visit: https://support.apple.com/kb/HT201222.
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