Ruby 3.0.3を入れる方法
↓以下は自分用です。上の２つの記事を見ればできます。
バージョン確認
$ rbenv versions
$ brew update
$ brew upgrade rbenv ruby-build
Ruby 3.0.3が表示される
$ rbenv install -l
$ rbenv install 3.0.3
$ rbenv global 3.0.3
確認
$ rbenv versions
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