About a year ago, I asked a question about Die2Nite asking if you could camp outdoors and survive. At the time, the answer was no. However, when Season 2 started (a few months after I originally asked the question), the answer changed to yes.
What should we do in cases like this where game patches or updates change the answer to a question?
If you own the question, then yx.'s advice is on the spot - unaccept the now-incorrect-answer and accept the now-correct-answer.
It's not unlike if, say, someone posts just a workaround or weak answer to the question that's sufficient, but not optimal. You accept because it works. Two months pass before someone shows up with exactly the answer you need. In this case, the other answer isn't invalidated or anything, but the new answer is more useful and is in fact what you've been looking for.
The scenario where the old answer is invalidated should play pretty much identically to the above.
