Besides the stem riser adapter mentioned above, there are also these options.

1. A higher rise stem. The couple pics I saw in google search seem to be sporting 10 degree stem so you could put a 35° on there or something like that. Just need to get one with a 1 1/8 steerer clamp and a bar clamp diameter to match your bars. I'll post a chart below that shows how much stem angle changes rise.

2. A (higher) rise bar. Just need to determine the clamp diameter of your bar. (25.4 or 31.8mm). 75mm (or so) rise bars are readily available. Even higher rise can be found here and there.

Here's the stem angle, reach and rise chart from Habanero: