How can I update my iPad air to latest version of IOS?
I do not see any other version available under automatic updates. Last update was for 12.5.7 and says it is up to date.
iPad Air, iOS 12
If you have an original iPad Air, it cannot be upgraded past your current hardware level due to its hardware limitations. That mode was discontinued almost eight years ago.
To run the current iPadOS version your need one of these iPads: