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.

[29, 411, 366, 438, 162, 117, 121, 436, 351, 344, 357, 420, 32, 464, 289, 395, 187, 132, 258, 425]
[464, 411, 366, 438, 162, 117, 121, 436, 351, 344, 357, 420, 32, 29, 289, 395, 187, 132, 258, 425]