Spree Commerce 4.2 supportsRuby 3.0 and Rails 6.1
Spree Commerce 4.2 now supports Ruby 2.5, 2.6, 2.7, and, the recently released, 3.0. Rails 6.0 and 6.1 are supported out-of-the-box, so you don’t need to upgrade to Rails 6.1 straight away. You can first move to Spree Commerce 4.2 and later perform the Rails upgrade, minimizing the risk of any issues.
That might not mean much to those who are not well acquainted with the technical aspects of ecommerce development, but for developers, this opens up a new realm of possibilities.