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Step-by-step guide

1. $ gem install bundler
2. find where the bundle ruby gem is installed (e.g. /usr/local/share/gems/gems/bundler-1.13.1/ )
3. $ grep -R -i md5 *
   (this will search recursively for any file that has md5 [also case-insensitive] )
4. In .rb files,
   change any occurrence of digest/md5 to digest
   and change any occurrence of MD5 to SHA256
5. You should be good

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