An update of Rubocop was merged, as Hound gained support that version recently.
Some of the existing cops find more issues now, so your plugin rubocop runs might break. Usually this should be fixed easily by running rubocop --auto-correct , at least in a setup similar to the one we run on the CI (which means, the plugin re-uses the core config).
Also, some cops got renamed.
Please make sure your plugin is updated to match the core rubocop version.