diff --git a/Gemfile b/Gemfile
index a7f4a9b5e..c0d72503b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -16,7 +16,7 @@ gem "json-schema"
 gem "goodcheck"
 gem 'digest'
 gem 'tempfile'
-gem "rdoc", "~> 6.11.0"
+gem "rdoc"
 gem "fileutils"
 gem "raap"
 gem "activesupport", "~> 7.0"
diff --git a/Gemfile.lock b/Gemfile.lock
index a3f0d3b90..780bc67c9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -95,7 +95,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rdoc (6.11.0)
+    rdoc (6.13.1)
       psych (>= 4.0.0)
     regexp_parser (2.10.0)
     rspec (3.13.0)
@@ -202,7 +202,7 @@ DEPENDENCIES
   rake-compiler
   rbs!
   rbs-amber!
-  rdoc (~> 6.11.0)
+  rdoc
   rspec
   rubocop
   rubocop-on-rbs
diff --git a/lib/rbs/annotate/formatter.rb b/lib/rbs/annotate/formatter.rb
index ae1ae3c54..c53124e27 100644
--- a/lib/rbs/annotate/formatter.rb
+++ b/lib/rbs/annotate/formatter.rb
@@ -59,20 +59,10 @@ def format(newline_at_end:)
 
       def self.each_part(doc, &block)
         if block
-          document =
-            case doc
-            when String
-              raise
-            when RDoc::Comment
-              document = doc.parse
-            when RDoc::Markup::Document
-              document = doc
-            end
-
-          if document.file
-            yield document
+          if doc.file
+            yield doc
           else
-            document.each do |d|
+            doc.each do |d|
               each_part(d, &block)
             end
           end
diff --git a/lib/rbs/annotate/rdoc_annotator.rb b/lib/rbs/annotate/rdoc_annotator.rb
index 68c06241b..06958998f 100644
--- a/lib/rbs/annotate/rdoc_annotator.rb
+++ b/lib/rbs/annotate/rdoc_annotator.rb
@@ -39,7 +39,9 @@ def annotate_decls(decls, outer: [])
       def each_part(subjects, tester:)
         if block_given?
           subjects.each do |subject, docs|
-            Formatter.each_part(subject.comment) do |doc|
+            comment = subject.comment
+            raise if comment.is_a?(String)
+            Formatter.each_part(comment.parse) do |doc|
               if tester.test_path(doc.file || raise)
                 yield [doc, subject]
               end
diff --git a/lib/rbs/annotate/rdoc_source.rb b/lib/rbs/annotate/rdoc_source.rb
index f47f212fa..f4ba46dfa 100644
--- a/lib/rbs/annotate/rdoc_source.rb
+++ b/lib/rbs/annotate/rdoc_source.rb
@@ -23,7 +23,7 @@ def load
         @stores.clear()
 
         RDoc::RI::Paths.each(with_system_dir, with_site_dir, with_home_dir, with_gems_dir ? :latest : false, *extra_dirs.map(&:to_s)) do |path, type|
-          store = RDoc::Store.new(path, type)
+          store = RDoc::Store.new(RDoc::Options.new, path:, type:)
           store.load_all
 
           @stores << store
diff --git a/lib/rdoc/discover.rb b/lib/rdoc/discover.rb
index c5f4a3b50..f6816143f 100644
--- a/lib/rdoc/discover.rb
+++ b/lib/rdoc/discover.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 begin
-  gem 'rdoc', '~> 6.4'
+  gem 'rdoc', '~> 6.13'
   require 'rdoc_plugin/parser'
   module RDoc
     class Parser
diff --git a/lib/rdoc_plugin/parser.rb b/lib/rdoc_plugin/parser.rb
index 2b78fada3..eb09dafd0 100644
--- a/lib/rdoc_plugin/parser.rb
+++ b/lib/rdoc_plugin/parser.rb
@@ -86,7 +86,7 @@ def parse_method_decl(decl:, context:, outer_name: nil)
       end
 
       def parse_method_alias_decl(decl:, context:, outer_name: nil)
-        alias_def = RDoc::Alias.new(nil, decl.old_name.to_s, decl.new_name.to_s, nil, decl.kind == :singleton)
+        alias_def = RDoc::Alias.new(nil, decl.old_name.to_s, decl.new_name.to_s, nil, singleton: decl.kind == :singleton)
         alias_def.comment = construct_comment(context: context, comment: comment_string(decl)) if decl.comment
         context.add_alias(alias_def)
       end
@@ -100,7 +100,7 @@ def parse_attr_decl(decl:, context:, outer_name: nil)
              when ::RBS::AST::Members::AttrAccessor
                'RW'
              end
-        attribute = RDoc::Attr.new(nil, decl.name.to_s, rw, nil, decl.kind == :singleton)
+        attribute = RDoc::Attr.new(nil, decl.name.to_s, rw, nil, singleton: decl.kind == :singleton)
         attribute.visibility = decl.visibility
         attribute.comment = construct_comment(context: context, comment: comment_string(decl)) if decl.comment
         context.add_attribute(attribute)
diff --git a/sig/annotate/formatter.rbs b/sig/annotate/formatter.rbs
index 0464658b7..1fb31f079 100644
--- a/sig/annotate/formatter.rbs
+++ b/sig/annotate/formatter.rbs
@@ -17,8 +17,8 @@ module RBS
 
       def self.translate: (RDoc::Markup::Document) -> String?
 
-      def self.each_part: (RDoc::Markup::Document | RDoc::Comment | String) { (RDoc::Markup::Document) -> void } -> void
-                        | (RDoc::Markup::Document | RDoc::Comment | String) -> Enumerator[RDoc::Markup::Document, void]
+      def self.each_part: (RDoc::Markup::Document) { (RDoc::Markup::Document) -> void } -> void
+                        | (RDoc::Markup::Document) -> Enumerator[RDoc::Markup::Document, void]
     end
   end
 end
diff --git a/sig/annotate/rdoc_annotater.rbs b/sig/annotate/rdoc_annotater.rbs
index 872c38430..5cb4dc712 100644
--- a/sig/annotate/rdoc_annotater.rbs
+++ b/sig/annotate/rdoc_annotater.rbs
@@ -17,7 +17,7 @@ module RBS
       end
 
       interface _WithRDocComment
-        def comment: () -> (RDoc::Markup::Document | RDoc::Comment | String)
+        def comment: () -> (RDoc::Comment | String)
       end
 
       def each_part: (Array[Object & _WithRDocComment], tester: _PathTester) { ([RDoc::Markup::Document, Object & _WithRDocComment]) -> void } -> void
diff --git a/stdlib/rdoc/0/code_object.rbs b/stdlib/rdoc/0/code_object.rbs
index 2a9f37f3d..af7f631f7 100644
--- a/stdlib/rdoc/0/code_object.rbs
+++ b/stdlib/rdoc/0/code_object.rbs
@@ -30,7 +30,7 @@ module RDoc
     # <!-- rdoc-file=lib/rdoc/code_object.rb -->
     # Our comment
     #
-    attr_reader comment: Markup::Document | Comment | String
+    attr_reader comment: Comment | String
 
     # <!--
     #   rdoc-file=lib/rdoc/code_object.rb
@@ -46,6 +46,6 @@ module RDoc
     # -->
     # Replaces our comment with `comment`, unless it is empty.
     #
-    def comment=: (Markup::Document | Comment | String | nil) -> (Markup::Document | Comment | String)
+    def comment=: (Comment | String | nil) -> (Comment | String | nil)
   end
 end
diff --git a/stdlib/rdoc/0/comment.rbs b/stdlib/rdoc/0/comment.rbs
index 9eb9894a5..ee71bc82c 100644
--- a/stdlib/rdoc/0/comment.rbs
+++ b/stdlib/rdoc/0/comment.rbs
@@ -20,6 +20,8 @@ module RDoc
     #
     attr_accessor location: String
 
+    alias file location
+
     # <!--
     #   rdoc-file=lib/rdoc/comment.rb
     #   - new(text = nil, location = nil, language = nil)
diff --git a/stdlib/rdoc/0/options.rbs b/stdlib/rdoc/0/options.rbs
new file mode 100644
index 000000000..c656dfbd2
--- /dev/null
+++ b/stdlib/rdoc/0/options.rbs
@@ -0,0 +1,76 @@
+%a{annotate:rdoc:skip}
+module RDoc
+  # <!-- rdoc-file=lib/rdoc/options.rb -->
+  # RDoc::Options handles the parsing and storage of options
+  #
+  # ## Saved Options
+  #
+  # You can save some options like the markup format in the `.rdoc_options` file
+  # in your gem.  The easiest way to do this is:
+  #
+  #     rdoc --markup tomdoc --write-options
+  #
+  # Which will automatically create the file and fill it with the options you
+  # specified.
+  #
+  # The following options will not be saved since they interfere with the user's
+  # preferences or with the normal operation of RDoc:
+  #
+  # *   `--coverage-report`
+  # *   `--dry-run`
+  # *   `--encoding`
+  # *   `--force-update`
+  # *   `--format`
+  # *   `--pipe`
+  # *   `--quiet`
+  # *   `--template`
+  # *   `--verbose`
+  #
+  # ## Custom Options
+  #
+  # Generators can hook into RDoc::Options to add generator-specific command line
+  # options.
+  #
+  # When `--format` is encountered in ARGV, RDoc calls ::setup_options on the
+  # generator class to add extra options to the option parser.  Options for custom
+  # generators must occur after `--format`.  `rdoc --help` will list options for
+  # all installed generators.
+  #
+  # Example:
+  #
+  #     class RDoc::Generator::Spellcheck
+  #       RDoc::RDoc.add_generator self
+  #
+  #       def self.setup_options rdoc_options
+  #         op = rdoc_options.option_parser
+  #
+  #         op.on('--spell-dictionary DICTIONARY',
+  #               RDoc::Options::Path) do |dictionary|
+  #           rdoc_options.spell_dictionary = dictionary
+  #         end
+  #       end
+  #     end
+  #
+  # Of course, RDoc::Options does not respond to `spell_dictionary` by default so
+  # you will need to add it:
+  #
+  #     class RDoc::Options
+  #
+  #       ##
+  #       # The spell dictionary used by the spell-checking plugin.
+  #
+  #       attr_accessor :spell_dictionary
+  #
+  #     end
+  #
+  # ## Option Validators
+  #
+  # OptionParser validators will validate and cast user input values.  In addition
+  # to the validators that ship with OptionParser (String, Integer, Float,
+  # TrueClass, FalseClass, Array, Regexp, Date, Time, URI, etc.), RDoc::Options
+  # adds Path, PathArray and Template.
+  #
+  class Options
+    def initialize: (?untyped loaded_options) -> void
+  end
+end
diff --git a/stdlib/rdoc/0/rdoc.rbs b/stdlib/rdoc/0/rdoc.rbs
index a5fa214ac..f00295040 100644
--- a/stdlib/rdoc/0/rdoc.rbs
+++ b/stdlib/rdoc/0/rdoc.rbs
@@ -190,7 +190,7 @@ module RDoc
     #
     # Usually this is called by super from a subclass.
     #
-    def initialize: (String text, String name) -> void
+    def initialize: (String text, String name, ?singleton: bool) -> void
 
     # <!--
     #   rdoc-file=lib/rdoc/method_attr.rb
@@ -267,7 +267,7 @@ module RDoc
     # -->
     # Creates a new AnyMethod with a token stream `text` and `name`
     #
-    def initialize: (String? text, String name) -> void
+    def initialize: (String? text, String name, ?singleton: bool) -> void
   end
 
   # <!-- rdoc-file=lib/rdoc/attr.rb -->
@@ -286,7 +286,7 @@ module RDoc
     # Creates a new Attr with body `text`, `name`, read/write status `rw` and
     # `comment`.  `singleton` marks this as a class attribute.
     #
-    def initialize: (String? text, String name, String rw, RDoc::Comment? comment, ?bool `singleton`) -> void
+    def initialize: (String? text, String name, String rw, RDoc::Comment? comment, ?singleton: bool) -> void
   end
 
   # <!-- rdoc-file=lib/rdoc/constant.rb -->
@@ -372,6 +372,8 @@ module RDoc
     #
     attr_accessor old_name: String
 
+    attr_reader singleton: bool
+
     # <!--
     #   rdoc-file=lib/rdoc/alias.rb
     #   - new(text, old_name, new_name, comment, singleton = false)
@@ -379,7 +381,7 @@ module RDoc
     # Creates a new Alias with a token stream of `text` that aliases `old_name` to
     # `new_name`, has `comment` and is a `singleton` context.
     #
-    def initialize: (String? text, String name, String old_name, RDoc::Comment? comment, ?bool `singleton`) -> void
+    def initialize: (String? text, String name, String old_name, RDoc::Comment? comment, ?singleton: bool) -> void
   end
 
   # <!-- rdoc-file=lib/rdoc/stats.rb -->
diff --git a/stdlib/rdoc/0/store.rbs b/stdlib/rdoc/0/store.rbs
index ceeb1f168..a48c95bd5 100644
--- a/stdlib/rdoc/0/store.rbs
+++ b/stdlib/rdoc/0/store.rbs
@@ -26,7 +26,7 @@ module RDoc
     # -->
     # Creates a new Store of `type` that will load or save to `path`
     #
-    def initialize: (?String? path, ?Symbol? type) -> void
+    def initialize: (Options, ?path: String? , ?type: Symbol?) -> void
 
     # <!--
     #   rdoc-file=lib/rdoc/store.rb
diff --git a/test/rbs/annotate/rdoc_source_test.rb b/test/rbs/annotate/rdoc_source_test.rb
index 298c47130..b9f4cd792 100644
--- a/test/rbs/annotate/rdoc_source_test.rb
+++ b/test/rbs/annotate/rdoc_source_test.rb
@@ -57,10 +57,10 @@ class Hello3
       assert_equal 1, klss.size
       klss[0].tap do |klass|
         assert_predicate klass, :documented?
-        assert_equal 1, klass.comment.parts.size
+        assert_equal 1, klass.comment.parse.parts.size
 
-        assert_nil RBS::Annotate::Formatter.translate(klass.comment)
-        assert_equal "Document for Hello1", RBS::Annotate::Formatter.translate(klass.comment.parts[0])
+        assert_nil RBS::Annotate::Formatter.translate(klass.comment.parse)
+        assert_equal "Document for Hello1", RBS::Annotate::Formatter.translate(klass.comment.parse.parts[0])
       end
     end
 
@@ -71,8 +71,8 @@ class Hello3
       klss[0].tap do |klass|
         refute_predicate klass, :documented?
 
-        assert_nil RBS::Annotate::Formatter.translate(klass.comment)
-        assert_equal "", RBS::Annotate::Formatter.translate(klass.comment.parts[0])
+        assert_nil RBS::Annotate::Formatter.translate(klass.comment.parse)
+        assert_equal "", RBS::Annotate::Formatter.translate(klass.comment.parse.parts[0])
       end
     end
 
@@ -82,10 +82,10 @@ class Hello3
       assert_equal 1, klss.size
       klss[0].tap do |klass|
         assert_predicate klass, :documented?
-        assert_equal 2, klass.comment.parts.size
+        assert_equal 2, klass.comment.parse.parts.size
 
-        assert_equal "Document (1) for Hello3", RBS::Annotate::Formatter.translate(klass.comment.parts[0])
-        assert_equal "Document (2) for Hello3", RBS::Annotate::Formatter.translate(klass.comment.parts[1])
+        assert_equal "Document (1) for Hello3", RBS::Annotate::Formatter.translate(klass.comment.parse.parts[0])
+        assert_equal "Document (2) for Hello3", RBS::Annotate::Formatter.translate(klass.comment.parse.parts[1])
       end
     end
   end
@@ -111,7 +111,7 @@ class Hello
       assert_equal 1, consts.size
       consts[0].tap do |const|
         assert_equal "FOO", const.name
-        assert_equal "Doc for FOO", RBS::Annotate::Formatter.translate(const.comment)
+        assert_equal "Doc for FOO", RBS::Annotate::Formatter.translate(const.comment.parse)
       end
     end
 
@@ -121,7 +121,7 @@ class Hello
       assert_equal 1, consts.size
       consts[0].tap do |const|
         assert_equal "VERSION", const.name
-        assert_equal "Doc for Hello::VERSION", RBS::Annotate::Formatter.translate(const.comment)
+        assert_equal "Doc for Hello::VERSION", RBS::Annotate::Formatter.translate(const.comment.parse)
       end
     end
 
@@ -158,7 +158,7 @@ def m5; end
 
       ms[0].tap do |m|
         assert_equal "m1", m.name
-        assert_equal "Doc for m1", RBS::Annotate::Formatter.translate(m.comment)
+        assert_equal "Doc for m1", RBS::Annotate::Formatter.translate(m.comment.parse)
       end
     end
 
@@ -167,7 +167,7 @@ def m5; end
 
       ms[0].tap do |m|
         assert_equal "m2", m.name
-        assert_equal "Doc for m2", RBS::Annotate::Formatter.translate(m.comment)
+        assert_equal "Doc for m2", RBS::Annotate::Formatter.translate(m.comment.parse)
         assert_equal "m1", m.is_alias_for.name
       end
     end
@@ -179,7 +179,7 @@ def m5; end
 
       ms[0].tap do |m|
         assert_equal "m4", m.name
-        assert_equal "Doc for m4", RBS::Annotate::Formatter.translate(m.comment)
+        assert_equal "Doc for m4", RBS::Annotate::Formatter.translate(m.comment.parse)
       end
     end
 
@@ -188,7 +188,7 @@ def m5; end
 
       ms[0].tap do |m|
         assert_equal "m5", m.name
-        assert_equal "Doc for m5", RBS::Annotate::Formatter.translate(m.comment)
+        assert_equal "Doc for m5", RBS::Annotate::Formatter.translate(m.comment.parse)
       end
     end
   end
@@ -218,7 +218,7 @@ class <<self
 
       attrs[0].tap do |attr|
         assert_equal "foo", attr.name
-        assert_equal "Doc for foo", RBS::Annotate::Formatter.translate(attr.comment)
+        assert_equal "Doc for foo", RBS::Annotate::Formatter.translate(attr.comment.parse)
         assert_equal "R", attr.rw
       end
     end
@@ -228,7 +228,7 @@ class <<self
 
       attrs[0].tap do |attr|
         assert_equal "bar", attr.name
-        assert_equal "Doc for bar and baz", RBS::Annotate::Formatter.translate(attr.comment)
+        assert_equal "Doc for bar and baz", RBS::Annotate::Formatter.translate(attr.comment.parse)
         assert_equal "RW", attr.rw
       end
     end
@@ -238,7 +238,7 @@ class <<self
 
       attrs[0].tap do |attr|
         assert_equal "baz", attr.name
-        assert_equal "Doc for bar and baz", RBS::Annotate::Formatter.translate(attr.comment)
+        assert_equal "Doc for bar and baz", RBS::Annotate::Formatter.translate(attr.comment.parse)
         assert_equal "RW", attr.rw
       end
     end
diff --git a/test/rbs/rdoc/rbs_parser_test.rb b/test/rbs/rdoc/rbs_parser_test.rb
index ef95eaf0f..a92f10b35 100644
--- a/test/rbs/rdoc/rbs_parser_test.rb
+++ b/test/rbs/rdoc/rbs_parser_test.rb
@@ -5,7 +5,7 @@
 class RDocPluginParserTest < Test::Unit::TestCase
   def parser(content)
     top_level = RDoc::TopLevel.new("a.rbs")
-    top_level.store = RDoc::Store.new()
+    top_level.store = RDoc::Store.new(RDoc::Options.new)
 
     RBS::RDocPlugin::Parser.new(top_level, content)
   end