rolling this back didn't seem to work...I wonder if I should just uninstall everything ruby-related:

[root@dwhitfield-foreman ~]# foreman-installer --scenario katello --help
Traceback (most recent call last):
13: from /usr/sbin/foreman-installer:3:in `<main>'
12: from /opt/rh/rh-ruby25/root/usr/share/rubygems/rubygems/core_ext/kernel_require.rb:39:in `require'
11: from /opt/rh/rh-ruby25/root/usr/share/rubygems/rubygems/core_ext/kernel_require.rb:128:in `rescue in require'
10: from /opt/rh/rh-ruby25/root/usr/share/rubygems/rubygems.rb:217:in `try_activate'
9: from /opt/rh/rh-ruby25/root/usr/share/rubygems/rubygems.rb:224:in `rescue in try_activate'
8: from /opt/rh/rh-ruby25/root/usr/share/rubygems/rubygems/specification.rb:1440:in `activate'
7: from /opt/rh/rh-ruby25/root/usr/share/rubygems/rubygems/specification.rb:1458:in `activate_dependencies'
6: from /opt/rh/rh-ruby25/root/usr/share/rubygems/rubygems/specification.rb:1458:in `each'
5: from /opt/rh/rh-ruby25/root/usr/share/rubygems/rubygems/specification.rb:1472:in `block in activate_dependencies'
4: from /opt/rh/rh-ruby25/root/usr/share/rubygems/rubygems/specification.rb:1440:in `activate'
3: from /opt/rh/rh-ruby25/root/usr/share/rubygems/rubygems/specification.rb:1458:in `activate_dependencies'
2: from /opt/rh/rh-ruby25/root/usr/share/rubygems/rubygems/specification.rb:1458:in `each'
1: from /opt/rh/rh-ruby25/root/usr/share/rubygems/rubygems/specification.rb:1469:in `block in activate_dependencies'
/opt/rh/rh-ruby25/root/usr/share/rubygems/rubygems/dependency.rb:310:in `to_specs': Could not find 'multi_json' (~> 1.10) among 175 total gem(s) (Gem::MissingSpecError)
Checked in 'GEM_PATH=/opt/theforeman/tfm/root/usr/share/gems:/root/.gem/ruby:/opt/rh/rh-ruby25/root/usr/share/gems:/opt/rh/rh-ruby25/root/usr/local/share/gems', execute `gem env` for more information