Windows Update, Windows Store Updates, iOS Software Update, iOS App Store Updates, Android OS Updates, Google Play App Updates, macOS Software Update, Mac App Store Updates, Chrome OS Updates, Chrome Updates, Firefox Updates, etc.
Do your updates! All of them, as often as possible!
If you’re worried about something breaking, take backups before you run the update.
It is better to get the update to fix security issues and risk some breakage than to continue running with the security issue.
If the device is considered obsolete or “End of Life”, you’ll no longer continue to receive security updates. You should stop using the device immediately, and upgrade to a device that has the latest security fixes. It is not safe to run an out of date/insecure device on the Internet!