The linked rbenv Show archive.org snapshot plugin rbenv-each Show archive.org snapshot is very helpful to keep QoL gems up to date that are not part of the Gemfile.

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For example, you can bump the geordi version for all your rubies with the following command:

rbenv each gem update geordi

Another useful example would be to bulk-update bundler or rubygems.

Note that rbenv-each hasn't been updated since 2018, but it is fully functional for me.