How to update Jailmaker?

Version v2.0.0 was released a few days ago, but there is not yet the procedure to update it spelled out on the docs. There is only a mention to download the python script and run it.

I'm also a little traumatized of updating anything on my machine that messes with the base OS (like systemd in this case). And could use some words of wisdom now.

What is the proper procedure to update JailMaker without losing my jails, and their configs?