bundle install failing because of dependency on deprecated mimemagic 0.3.5

Hello, i'm installing schleuder-web from the ansible automation script suggested in the docs.

Install is failing at the task where it bundle installs schleuder-web because it depends on mimemagic 0.3.5 which is no longer available.

Your bundle is locked to mimemagic (0.3.5) from rubygems repository
https://rubygems.org/ or installed locally, but that version can no longer be
found in that source. That means the author of mimemagic (0.3.5) has removed it.
You'll need to update your bundle to a version other than mimemagic (0.3.5) that
hasn't been removed in order to install

Looking at the gem here, I suspect it to be the dependency of a dependency. So please help me find out where is it to be updated Thanks