Thankfully, this challenge's design makes it pretty easy to update for. It's so open-ended, allowing you to do whatever you want, that it's rare for me to need to restrict or clarify anything when new content gets added to the game, so this challenge should still be playable.
I'm in the process of hosting all my challenges on Google Docs. That way, I can just update the document once and not have to worry about updating the challenge on every single place I've posted it. Keep an eye on this thread for that because this challenge does have a few minor updates that will be in the doc when I transfer it over.