Mac OS X 10.11.3 was an update to Mac OS X 10.11 released on January 19, 2016. This update includes the following: * Fixes an issue that may prevent some Mac computers from waking from sleep when connected to certain 4K displays. Enterprise content: * Third-party .pkg file receipts stored in /var/db/receipts are now retained when upgrading from OS X Yosemite. For detailed information about the security content of this update, see Apple Security Updates.