diff --git a/ruby.yaml b/ruby.yaml
index dff0f89..58445d3 100644
--- a/ruby.yaml
+++ b/ruby.yaml
@@ -75,10 +75,12 @@ data:
             - ruby
             - ruby-devel
             - ruby-libs
+            - ruby-default-gems
             - rubygems
             - rubygems-devel
             - rubygem-bigdecimal
             - rubygem-bundler
+            # It's used in Ruby 2.6 on f31.
             - rubygem-did_you_mean
             - rubygem-io-console
             - rubygem-irb