Could not find mime-types-1.25.1 in any of the sources (Bundler::GemNotFound)

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When deploying app to the production server, I navigate to the URL and get the error Could not find mime-types-1.25.1 in any of the sources (Bundler::GemNotFound).

The gem is most certainly there but it's still not found.

$ bundle show mime-types
/usr/local/rvm/gems/ruby-1.9.3-p484/gems/mime-types-1.25.1

As explained here Heroku push rejected: can't find jquery-rails-2.0.0 in sources Deleting the Gemfile.lock is the wrong thing to do, and this version of mime-types is the latest.

ruby-on-railsbundler
Could you add information about your production server? Are you using Apache and Passenger, or Unicorn, or Puma, etc? Is it possible that the server is running with a different version of Ruby? – Tim Moore
@TimMoore It was that my version of ruby had somehow got upgraded on the server. Thanks! – Matt Storm
Matt, can you write up what happened as an answer to your question and then accept that answer. It can be helpful for people who end up in a similar scenario, – ghayes
Please tell me how you fixed it? I'm having the same problem – FastSolutions