If you look at the source [1], you'll see what it's doing is very simple (the file I linked is basically the whole library, everything else is Gem-specific things and tests). You can even skip the gem and implement it yourself, not a big dependency at all, so no need for constant maintenance in this case :p

[1] https://github.com/vigetlabs/olive_branch/blob/main/lib/oliv...

I don't understand the issue with it not being updated for 3 years. Perhaps it's stable and requires no updates?

If the author says it's no longer maintained, then that's something different.