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gem update で SSL エラー (Windows)

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例によって Firefox のアップデートで Selenium Webdriver 周りでエラーが出るようになったので、gem update を久しぶりにしようとしたところ表題のエラーが発生していました。


>gem update
Updating installed gems
ERROR:  While executing gem ... (Gem::RemoteFetcher::FetchError)
    SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed (https://api.rubygems.org/specs.4.8.gz)

>gem --version
2.4.1 ※Windows だと 2.4 以上はバグがあるらしいのでそのうち対応せねば…

証明書をひとつ入れればよいようなので、下記手順にしたがって解決。

Workaround RubyGems' SSL errors on Ruby for Windows (RubyInstaller)

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