I agree with all the above, assuming these caps are doing power supply filtering. If they are in an RC circuit of some sort, controlling timing, then you should replace with the same uf rating.
Going higher in voltage is ok, as long as you don't go freakishly high. IIRC, if you replace a 10V with, say, a 10,000V, you would run into wierd leakage issues. But tech school was 30 years ago...
donjagra is right in that the little ceramic bypass caps seldom go bad. The electrolytics have a liquid in them that may leak out or dry up. That's usually why they fail.
And as pinballhelp says, watch your polarity! Get them in backwards, and they could actually explode.
HTH's