Issue #19843 has been updated by yahonda (Yasuo Honda). I'm going to open a pull request to Rails that inform that BigDecimal version added as add_dependency will be 3.1.4 or higher. If Ruby 2.7 and 3.0 users and want BigDecimal as their default gem, they can pin the BigDecimal version to the applications Gemfile. ---------------------------------------- Feature #19843: Promote bigdecimal as bundled gems at Ruby 3.4 https://bugs.ruby-lang.org/issues/19843#change-104397 * Author: hsbt (Hiroshi SHIBATA) * Status: Assigned * Priority: Normal ---------------------------------------- I triaged target list for bundled gems at https://bugs.ruby-lang.org/issues/19351. After that, I resolved bigdecimal dependency from our test suite at https://github.com/ruby/ruby/commit/3ef6364a988ab24ca7fdbb7d1b6840b2a40f1466 I propose to promote `bigdecimal` as bundled gems at Ruby 3.4. @mrkn Is it okay? I will add `bigdecimal` to `Gem::BUNDLED_GEMS::SINCE` for Ruby 3.3.0-preview2. -- https://bugs.ruby-lang.org/