Given the task definition and input, reply with output. In this task, you are given a list of unique integers you need to swap the positions of maximum and minimum element in the list and return the updated list.

[207, 186, 244, 399, 290, 356, 338, 387, 150, 91, 271, 360, 362, 454, 99, 367, 129, 278, 398, 48]

[207, 186, 244, 399, 290, 356, 338, 387, 150, 91, 271, 360, 362, 48, 99, 367, 129, 278, 398, 454]