+ gem install chef:13.8.5 berkshelf:6.3.1 io-console:0.4.6 etc webrick --no-document
ERROR:  Error installing chef:
        The last version of public_suffix (< 6.0, >= 2.0.2) to support your Ruby & RubyGems was 4.0.7. Try installing it with `gem install public_suffix -v 4.0.7` and then running the current command again
        public_suffix requires Ruby version >= 2.6. The current ruby version is 2.5.0.
ERROR:  Error installing berkshelf:
        The last version of public_suffix (< 6.0, >= 2.0.2) to support your Ruby & RubyGems was 4.0.7. Try installing it with `gem install public_suffix -v 4.0.7` and then running the current command again
        public_suffix requires Ruby version >= 2.6. The current ruby version is 2.5.0.