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Any way to update the software in Raspian without updating the OS?

So, I've had a Raspberry Pi 4 sitting brand new in a box for a few years, and decided to install BirdNetPi on it yesterday.

It's working like a champ, but because BirdNetPi needed a legacy version of Raspian, it's got old software on it.

Is there any way to update the software (i.e. RealVNC) without updating the OS? There is no built-in software updater, and I seem to very easily break Linux every time I make an attempt to use it. LOL