1 files changed, 5 insertions, 0 deletions
diff --git a/lib/rubygems/psych_tree.rb b/lib/rubygems/psych_tree.rb
index b90f9f7d1d..24857adb9d 100644
--- a/lib/rubygems/psych_tree.rb
+++ b/lib/rubygems/psych_tree.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 module Gem
   if defined? ::Psych::Visitors
     class NoAliasYAMLTree < Psych::Visitors::YAMLTree
@@ -13,6 +14,10 @@ module Gem
         @emitter.scalar str, nil, nil, false, true, quote
       end
 
+      def visit_Hash(o)
+        super(o.compact)
+      end
+
       # Noop this out so there are no anchors
       def register(target, obj)
       end