Apple releases security updates for El Capitan 10.11.3, Yosemite and Mavericks on Jan. 19, as well as iOS 9.2.1. An update to tvOS 9.1.1 was released on Jan. 2, 2016. Use your device's update software to get these necessary security patches. You may also get a combo update for El Capitan 10.11.3.