[stormbrew]

We don't really update it for each new monarch, it's just a set of rules. They were last changed fairly recently, to remove male primogeniture in case Prince William had a daughter as his first child (though he didn't). Every single Commonwealth country had to pass its own individual bill amending the Act of Succession, and it finished in 2015[1]. It's pretty unlikely they'll change again any time soon, the only thing that's still up for much debate is the requirement that the person sitting on the throne isn't Catholic.

It'd be a hell of a scandal if these laws got out of sync, and yet it would be one of the stupidest scandals in history.

[1] https://en.wikipedia.org/wiki/Perth_Agreement