Rails 5.2.5, 6.0.3.6 and 6.1.3.1 were released with the updated dependencies. https://weblog.rubyonrails.org/2021/3/26/marcel-upgrade-releases/ https://weblog.

Rails 5.2.5, 6.0.3.6 and 6.1.3.1 were released with the updated dependencies. https://weblog.rubyonrails.org/2021/3/26/marcel-upgrade-releases/ https://weblog.rubyonrails.org/2021/3/26/marcel-upgrade-rele... From the release: "Before 1.0.0, Marcel—which is distributed under the terms of the MIT License, like Rails—indirectly depended on MIME type data released under the incompatible GNU General Public License. Marcel 1.0.0 instead directly packages MIME type data adapted from Apache Tika, released under the permissive and compatible Apache License 2.0."