When you get an error like this:

Invalid gemspec in [/opt/www/foo-project.makandra.de/shared/bundle/ruby/1.8/specifications/carrierwave-0.6.2.gemspec]: Illformed requirement ["#<YAML::Syck::DefaultKey:0x7fda6f84d2e8> 1.1.4"]

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... the machine's Rubygems needs to be updated.

If that happens on your local machine

• Manually remove the offending's gem files and specifications. The paths will be something like /usr/lib/ruby/gems/1.8/gems/your-broken-gem and /usr/lib/ruby/gems/1.8/specifications/your-broken-gem
• Update Rubygems or Slimgems by running gem update --system
• Run bundler on your project to reinstall the offending gem.

If this happens to your during deployment

• Ask your operations team to do it.
• After the update, log onto the server and remove the broken Bundler cache directories like (e. g. shared/bundle)
• Then redeploy.