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Rails has evolved to include many features that were previously provided by external gems. Five gems that can be removed from modern Rails applications include: aasm (replaced by Rails enums since 4.1), activerecord-import (replaced by insert_all/upsert_all in Rails 6.0), timecop (replaced by ActiveSupport::Testing::TimeHelpers since 4.1), marginalia (replaced by built-in query logs in Rails 7.0), and attr_encrypted (replaced by ActiveRecord encryption in Rails 7.0). Removing these dependencies simplifies Rails upgrades and reduces maintenance complexity.

5 gems you no longer need with Rails