diff --git a/lib/github/markup/rdoc.rb b/lib/github/markup/rdoc.rb
index 8332e402..0d58f826 100644
--- a/lib/github/markup/rdoc.rb
+++ b/lib/github/markup/rdoc.rb
@@ -9,7 +9,11 @@ def initialize(content)
       end
 
       def to_html
-        h = ::RDoc::Markup::ToHtml.new
+        if Gem::Version.new(::RDoc::VERSION) < Gem::Version.new('4.0.0')
+          h = ::RDoc::Markup::ToHtml.new
+        else
+          h = ::RDoc::Markup::ToHtml.new(::RDoc::Options.new)
+        end
         h.convert(@content)
       end
     end