iOS 9.2.1 and OS X 10.11.3 are now available

Apple on Tuesday released updates for iOS and OS X. Both updates are minor; Apple says that both contain security updates and bug fixes.
iOS 9.2.1 also fixes a problem “that could prevent the completion of app installation when using an MDM server.”
Before installing the updates, back up the data on your Mac and iOS device.iOS 9.2.1To install the iOS update on your device through a Wi-Fi or mobile connection:Open the Settings app.
Tap General > Software Update.
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