あいざわです

> Gem::RemoteFetcher::FetchError: Errno::ETIMEDOUT: A connection attempt
> failed because the connected party did not
>
> properly respond after a period of time, or established connection failed
> because connected host has failed to respond.
>
> - connect(2) (http://r
> ubygems.org/quick/Marshal.4.8/builder-3.0.0.gemspec.rz)
> An error occured while installing builder (3.0.0), and Bundler cannot
> continue.
> Make sure that `gem install builder -v '3.0.0'` succeeds before bundling.

エラーメッセージに書いてある通りの対処をしてみてはいかがでしょうか

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Ayumu AIZAWA

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