I know there was a 4K Blu release, but I never saw a point in upgrading to it because, IMO, aside from the snow sequences in Romania, I didn't see the resolution and HDR bump improving anything. As it stands, this DVD upscales wonderfully onto my 4K screen; I mean, it honestly looks like a Blu-ray, to the point my wife actually asked me while we were watching it this week, "This is a DVD?!?"