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We should double-check the list of Gems which were promoted and deprecated
Anything that depends on Rails 6.0.0 requires a version of active-model which requires Ruby 2.5
As a result, updating active-fedora to support Rails 6.0.0 does not permit Ruby 2.4 to be used in the builds
Support for future releases:
With the Rails release of 6.1.0, we will only release versions 6.0.Z and 5.2.Z
Blacklight still does not support Rails 6.0.0