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More than 5 years have passed since last update.

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updated at

RubyGems 自体のバージョンをアップデートする

$ gem update --system
Updating rubygems-update
Fetching: rubygems-update-2.6.8.gem (100%)
Successfully installed rubygems-update-2.6.8
Parsing documentation for rubygems-update-2.6.8
Installing ri documentation for rubygems-update-2.6.8
Installing darkfish documentation for rubygems-update-2.6.8
Done installing documentation for rubygems-update after 33 seconds
Parsing documentation for rubygems-update-2.6.8
Done installing documentation for rubygems-update after 0 seconds
Installing RubyGems 2.6.8
RubyGems 2.6.8 installed
Parsing documentation for rubygems-2.6.8
Installing ri documentation for rubygems-2.6.8

Special thanks to @kubo39 :bow:

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