Is My Apple Device Current?

Operating System Version Numbers, February 2017.

Across the past two months, Apple has released system updates for all devices:

os-version-table-february-2017

How To Check Your OS Version and Perform an Update

Mac
Click the  at the top left of the Finder and select About This Mac. Click the “Software Update” button.

iPhone/iPad
Open Settings and select General and then “Software Update.”

Apple TV
Open Settings and select General and “About.” To check for an update, open Settings, then System and choose “Software Updates.”

Watch
On your iPhone, open the Watch app and select General and “Software Update.”