The build log mentions installing both ruby2.7 and ruby3.0, and rspec is installed for ruby2.7: [ 130s] [255/259] cumulate ruby2.7-rubygem-rspec-3.10.0-2.2 So my guess is that the Ruby RPM macros are not set properly in the openSUSE:Factory:zSystems project. See https://build.opensuse.org/projects/openSUSE:Factory/prjconf