Git -> error: unknown option 'prune-tags'

[MIKNOTAURO]

Details

I'm getting this error: unknown option `prune-tags' after build my docs.

I saw the code inside
vcs_support/backends/git.py

The fetch method has a flag '--prune-tag' which is not a valid flag in git.

I deleted that part and now everything works, but now I'm curious.

Did I miss something? or Am I wrong?

[dojutsu-user]

Can this be related to the git version (it should be >=2.17) ??
This error is same as this (comment).

[stsewd]

I'm guessing you are using a local installation, you need git >=2.17, see https://docs.readthedocs.io/en/latest/install.html#requirements