How much risk with this are you willing to take?
This is money you must, absolutely, have available to you by April 15 of next year -- whether this exact money or an equivalent amount. If you aren't sure you can replace it if you lose it, I'd say an 11 month CD - get what little you can, for sure, but don't take any risk with it.
Otherwise, how much risk are you willing to take? If you lose, say, 10% of the value seeking a higher yield, are you fine with making up for that out of pocket? If so, there are various sliding scales: anything from a short-term bond fund to a stock mutual fund (the latter of which could potentially lose a lot more than 10%!).