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by Rafert 3776 days ago
Its the other way around actually: ActionMailer 4.2 depends on mail ~> 2.5, >= 2.5.4, so you'll get 2.6.3 now. That version depends on mime-types <3, >= 1.16, so you'll get 2.99.

The big change in mime-types 3 is using the columnar store by default, which is where the memory savings come from. It's opt-in from mime-types 2.6 onwards because it's a breaking change. Mail and afaik most other gems have opted in already.