u/Hot-Cockroach-1231

I’m traveling to Japan and my flight is XNA to ORD then to HND. I have a 40 minute layover in ORD but am nervous that this won’t be enough time to board for my flight to Japan. I booked through my credit card and called them to try and change only the XNA to ORD leg of the flight, but they said they couldn’t do that. Called the airline and they said I would have to check with international booking. I don’t want to change any of the rest of my flights - is there a way I can do that? Will I have to go through security again at ORD for international flight? Any advice is welcome - I’m really nervous I’ll miss the flight to Japan.