[Game Client] In-game UI elements not correctly sized on high resolution display

I recently upgraded to a 4k monitor, and obviously the first thing I did was try to play League on it. In general the game holds up really well. The characters and environment are all sized correctly. However, a lot of the in-game UI elements (health bars, icons on the map, store and main menus, etc.) are incorrectly sized. It's most likely that they're using pixels and as such do not scale properly when displayed on a high resolution/DPI monitor.

I've attached a few screenshots for reference. It won't let me upload them at the full resolution, so I've downscaled them to 1920x1080. The small HUD elements should still be clearly visible.