Newb question. How to update plotman to new revisions

I am running plotman on Ubuntu 21.04. I installed a few weeks ago and it works and I’m getting roughly 36 plots per day. I am reading about the increased performance on plotman (at least I think it’s plotman referenced) for later revision/forks. Any ideas? plotman 0.3.1
Times below for reference. This is while running 16 parallel plots with 40 min staggers.

Time for phase 1 = 13375.259 seconds. CPU (158.360%) Wed Jun 9 09:21:15 2021
Time for phase 2 = 6519.859 seconds. CPU (83.570%) Wed Jun 9 11:09:55 2021
Time for phase 3 = 14910.020 seconds. CPU (83.310%) Wed Jun 9 15:18:25 2021
Time for phase 4 = 1093.257 seconds. CPU (82.550%) Wed Jun 9 15:36:38 2021
Total time = 35898.397 seconds. CPU (111.300%) Wed Jun 9 15:36:38 2021