Ruby 2.1.0 ist veraltet und wird nicht mehr betreut.
$ rvm install ruby 2.1.0
[...]
Install of ruby-2.1.0 - #complete
WARNING: Please be aware that you just installed a ruby that is no longer maintained (2017-04-01), for a list of maintained rubies visit:
http://bugs.ruby-lang.org/projects/ruby/wiki/ReleaseEngineering
Please consider upgrading to ruby-3.0.0 which will have all of the latest security patches.
Ruby 2.1.0 ist veraltet und wird nicht mehr betreut.
```
$ rvm install ruby 2.1.0
[...]
Install of ruby-2.1.0 - #complete
WARNING: Please be aware that you just installed a ruby that is no longer maintained (2017-04-01), for a list of maintained rubies visit:
http://bugs.ruby-lang.org/projects/ruby/wiki/ReleaseEngineering
Please consider upgrading to ruby-3.0.0 which will have all of the latest security patches.
```
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Ruby 2.1.0 ist veraltet und wird nicht mehr betreut.