run bundle update --minor

[SethTisue]

I was unable to preview the site locally without doing this first

I used --minor because it's more conservative and seems sufficient to fix the errors I was getting

I was seeing:

Your bundle is locked to minitest (5.14.1) 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
minitest (5.14.1) has removed it. You'll need to update your bundle to a version other than minitest
(5.14.1) that hasn't been removed in order to install.

and

Your bundle is locked to listen (3.2.1) 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 listen
(3.2.1) has removed it. You'll need to update your bundle to a version other than listen (3.2.1)
that hasn't been removed in order to install.

[SethTisue]

as usual with Ruby stuff I have no real idea what I'm doing, but nobody else here seems to either, so, merging...