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After installing the mollie-api-ruby gem I was not able to use the API, due to an "undefined method `[]' for #<Set: {#<MIME::Type: application/json>}>" error. I found out it was because of my version of mime-types (3.1).
This fix forces the use of mime-types < v3
See also: https://twitter.com/RogiervdBerg/status/768184731284414466
Version 2.99 of mime-types is still supported as 2.99.x, receiving quarterly updates of the IANA registry and security updates for two years. It will reach full end of life on 2017-11-21.