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I just updated the mime-types gem with gem update mime-types. gem list displayed mime-types (1.16) prior to updating. After the update gem list shows mime-types (1.17.2, 1.16). Why are two version displayed?
More info: I have other Rails projects on the same computer. I have not updated the mime-types gem in any other projects. Running gem list from another project’s directory (where mime-types has not been updated) displays mime-types (1.16).
You have both versions installed. If you want to delete old versions (which will not always will be possible due to dependencies) use
gem cleanup.