last update on MacBook air 2017 is High Sierra 10.13.6
MacBook Air is 2017 and last update was High Sierra 10.13.6. Is there another update available.
MacBook Air 13″, macOS 10.12
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On Macs, Apple uses Update to mean minor updates of the same version (e.g., 10.13.5 to 10.13.6) and upgrade to mean for example, 10.13.6 to macOS 11.
An early 2015 and a 2017 MacBook Air can be upgraded to the latest version of Monterey macOS 12. See: How to download macOS - Apple Support
A 2018 or later MacBook Air can be upgraded to the current version of Ventura macOS 13. See: How to upgrade to macOS Ventura - Apple Support
Be aware that if you upgrade to Catalina 10.15.7 or later you will also need to update any non-Apple 32-bit apps if you have any. See the following for more information: https://www.macworld.com/article/232735/how-to-check-if-mac-software-is-32-or-64-bit.html