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railsを5.2.3から6.0,rubyを2.5.1から2.6.4にあげてみた

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bundle installをしたら、下記のエラー

Bundler could not find compatible versions for gem "railties":
  In Gemfile:
    railties (>= 6.0.0)

    rails (~> 6.0.0) was resolved to 6.0.0, which depends on
      railties (= 6.0.0)

railtiesのバージョンアップが必要だったので、Gemfileに下記を追加。

gem 'railties', '>= 6.0.0
$ rails s

起動してみると、ワーニングがでた。

/Users/ユーザー名/.rbenv/versions/2.6.4/lib/ruby/2.6.0/fileutils/version.rb:4: warning: already initialized constant FileUtils::VERSION
$ gem uninstall fileutils
$ gem update --default

上記コマンドで解消。

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