As long as it's an E-85 rated engine, you can use 87 and higher.
Your owner's manual should explain that.
Don't believe anything you are told on the internet, including what I tell you, without verifying in the manual. In fact, you could save time by checking the manual first.
You can download the latest manual at Jeep.com . It is easier to search for things with the digital version than with the paper version.