Is there something I can do to condition myself to be able to run uphill ?

I have been able to condition myself to run 2+ hours at a fast pace but for some reason running uphill always kicks my ***.
The most,I can run uphill is 200~300 meters before I become completely exhausted and need to stop.
Is there a type of training I can do so I can make it up the hill.
( *I’ve only been able to make it up the hill nonstop once)