diff --git a/.github/workflows/super_diff.yml b/.github/workflows/super_diff.yml
index 0e144821..65850eee 100644
--- a/.github/workflows/super_diff.yml
+++ b/.github/workflows/super_diff.yml
@@ -61,6 +61,7 @@ jobs:
         rspec_appraisal:
           - rspec_lt_3_10
           - rspec_gte_3_10
+          - rspec_gte_3_13
     env:
       BUNDLE_GEMFILE: gemfiles/${{ matrix.rails_appraisal }}_${{ matrix.rspec_appraisal }}.gemfile
     steps:
diff --git a/.nvmrc b/.nvmrc
index b009dfb9..87834047 100644
--- a/.nvmrc
+++ b/.nvmrc
@@ -1 +1 @@
-lts/*
+20.12.2
diff --git a/Appraisals b/Appraisals
index ec91ea08..a50022e9 100644
--- a/Appraisals
+++ b/Appraisals
@@ -49,12 +49,26 @@ appraisals = {
       gem "rspec-mocks", "3.12.0"
       gem "rspec-support", "3.12.0"
 
+      gem "rspec-rails" if with_rails
+    end,
+  rspec_gte_3_13:
+    proc do |with_rails|
+      version = [">= 3.13", "< 4"]
+
+      # gem "rspec", *version
+
+      gem "rspec", "3.13.0"
+      gem "rspec-core", "3.13.0"
+      gem "rspec-expectations", "3.13.0"
+      gem "rspec-mocks", "3.13.0"
+      gem "rspec-support", "3.13.0"
+
       gem "rspec-rails" if with_rails
     end
 }
 
 rails_appraisals = %i[no_rails rails_6_0 rails_6_1 rails_7_0]
-rspec_appraisals = %i[rspec_lt_3_10 rspec_gte_3_10]
+rspec_appraisals = %i[rspec_lt_3_10 rspec_gte_3_10 rspec_gte_3_13]
 
 rails_appraisals.each do |rails_appraisal|
   rspec_appraisals.each do |rspec_appraisal|
diff --git a/gemfiles/no_rails_rspec_gte_3_13.gemfile b/gemfiles/no_rails_rspec_gte_3_13.gemfile
new file mode 100644
index 00000000..a61d50b0
--- /dev/null
+++ b/gemfiles/no_rails_rspec_gte_3_13.gemfile
@@ -0,0 +1,23 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "appraisal", git: "https://github.com/thoughtbot/appraisal"
+gem "bundler-audit"
+gem "childprocess"
+gem "climate_control"
+gem "pry-byebug", platform: :mri
+gem "pry-nav", platform: :jruby
+gem "rake"
+gem "prettier_print"
+gem "syntax_tree"
+gem "syntax_tree-haml"
+gem "syntax_tree-rbs"
+gem "warnings_logger"
+gem "rspec", "3.13.0"
+gem "rspec-core", "3.13.0"
+gem "rspec-expectations", "3.13.0"
+gem "rspec-mocks", "3.13.0"
+gem "rspec-support", "3.13.0"
+
+gemspec path: "../"
diff --git a/gemfiles/rails_6_0_rspec_gte_3_13.gemfile b/gemfiles/rails_6_0_rspec_gte_3_13.gemfile
new file mode 100644
index 00000000..ebff810d
--- /dev/null
+++ b/gemfiles/rails_6_0_rspec_gte_3_13.gemfile
@@ -0,0 +1,30 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "appraisal", git: "https://github.com/thoughtbot/appraisal"
+gem "bundler-audit"
+gem "childprocess"
+gem "climate_control"
+gem "pry-byebug", platform: :mri
+gem "pry-nav", platform: :jruby
+gem "rake"
+gem "prettier_print"
+gem "syntax_tree"
+gem "syntax_tree-haml"
+gem "syntax_tree-rbs"
+gem "warnings_logger"
+gem "activerecord-jdbcsqlite3-adapter", platform: :jruby
+gem "jdbc-sqlite3", platform: :jruby
+gem "net-ftp"
+gem "combustion"
+gem "rails", "~> 6.0.0"
+gem "sqlite3", "~> 1.4.0", platform: [:ruby, :mswin, :mingw]
+gem "rspec", "3.13.0"
+gem "rspec-core", "3.13.0"
+gem "rspec-expectations", "3.13.0"
+gem "rspec-mocks", "3.13.0"
+gem "rspec-support", "3.13.0"
+gem "rspec-rails"
+
+gemspec path: "../"
diff --git a/gemfiles/rails_6_1_rspec_gte_3_13.gemfile b/gemfiles/rails_6_1_rspec_gte_3_13.gemfile
new file mode 100644
index 00000000..2d27faa1
--- /dev/null
+++ b/gemfiles/rails_6_1_rspec_gte_3_13.gemfile
@@ -0,0 +1,30 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "appraisal", git: "https://github.com/thoughtbot/appraisal"
+gem "bundler-audit"
+gem "childprocess"
+gem "climate_control"
+gem "pry-byebug", platform: :mri
+gem "pry-nav", platform: :jruby
+gem "rake"
+gem "prettier_print"
+gem "syntax_tree"
+gem "syntax_tree-haml"
+gem "syntax_tree-rbs"
+gem "warnings_logger"
+gem "activerecord-jdbcsqlite3-adapter", platform: :jruby
+gem "jdbc-sqlite3", platform: :jruby
+gem "net-ftp"
+gem "combustion"
+gem "rails", "~> 6.1.0"
+gem "sqlite3", "~> 1.4.0", platform: [:ruby, :mswin, :mingw]
+gem "rspec", "3.13.0"
+gem "rspec-core", "3.13.0"
+gem "rspec-expectations", "3.13.0"
+gem "rspec-mocks", "3.13.0"
+gem "rspec-support", "3.13.0"
+gem "rspec-rails"
+
+gemspec path: "../"
diff --git a/gemfiles/rails_7_0_rspec_gte_3_13.gemfile b/gemfiles/rails_7_0_rspec_gte_3_13.gemfile
new file mode 100644
index 00000000..0ca8c554
--- /dev/null
+++ b/gemfiles/rails_7_0_rspec_gte_3_13.gemfile
@@ -0,0 +1,30 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "appraisal", git: "https://github.com/thoughtbot/appraisal"
+gem "bundler-audit"
+gem "childprocess"
+gem "climate_control"
+gem "pry-byebug", platform: :mri
+gem "pry-nav", platform: :jruby
+gem "rake"
+gem "prettier_print"
+gem "syntax_tree"
+gem "syntax_tree-haml"
+gem "syntax_tree-rbs"
+gem "warnings_logger"
+gem "activerecord-jdbcsqlite3-adapter", platform: :jruby
+gem "jdbc-sqlite3", platform: :jruby
+gem "net-ftp"
+gem "combustion"
+gem "rails", "~> 7.0.0"
+gem "sqlite3", "~> 1.4.0", platform: [:ruby, :mswin, :mingw]
+gem "rspec", "3.13.0"
+gem "rspec-core", "3.13.0"
+gem "rspec-expectations", "3.13.0"
+gem "rspec-mocks", "3.13.0"
+gem "rspec-support", "3.13.0"
+gem "rspec-rails"
+
+gemspec path: "../"
diff --git a/lib/super_diff/rspec.rb b/lib/super_diff/rspec.rb
index 70bc5325..4a176005 100644
--- a/lib/super_diff/rspec.rb
+++ b/lib/super_diff/rspec.rb
@@ -79,7 +79,16 @@ def self.a_value_within_something?(value)
     end
 
     def self.aliased_matcher?(value)
-      value.is_a?(::RSpec::Matchers::AliasedMatcher)
+      if SuperDiff::RSpec.rspec_version < "3.13.0"
+        value.is_a?(::RSpec::Matchers::AliasedMatcher)
+      else # See Github issue #250.
+        !ordered_options?(value) && value.respond_to?(:base_matcher)
+      end
+    end
+
+    def self.ordered_options?(value)
+      defined?(::ActiveSupport::OrderedOptions) &&
+        value.is_a?(::ActiveSupport::OrderedOptions)
     end
 
     def self.rspec_version
diff --git a/lib/super_diff/rspec/monkey_patches.rb b/lib/super_diff/rspec/monkey_patches.rb
index b4bd6cfe..6e063ffe 100644
--- a/lib/super_diff/rspec/monkey_patches.rb
+++ b/lib/super_diff/rspec/monkey_patches.rb
@@ -309,73 +309,146 @@ def format(value)
   end
 
   module Matchers
-    class ExpectedsForMultipleDiffs
-      SuperDiff.insert_singleton_overrides(self) do
-        # Add a key for different sides
-        def from(expected)
-          return expected if self === expected
-
-          text = colorizer.wrap("Diff:", SuperDiff.configuration.header_color)
-
-          if SuperDiff.configuration.key_enabled?
-            text +=
-              "\n\n" +
-                colorizer.wrap(
-                  "┌ (Key) ──────────────────────────┐",
-                  SuperDiff.configuration.border_color
-                ) + "\n" +
-                colorizer.wrap("│ ", SuperDiff.configuration.border_color) +
-                colorizer.wrap(
-                  "‹-› in expected, not in actual",
-                  SuperDiff.configuration.expected_color
-                ) +
-                colorizer.wrap("  │", SuperDiff.configuration.border_color) +
-                "\n" +
-                colorizer.wrap("│ ", SuperDiff.configuration.border_color) +
-                colorizer.wrap(
-                  "‹+› in actual, not in expected",
-                  SuperDiff.configuration.actual_color
-                ) +
-                colorizer.wrap("  │", SuperDiff.configuration.border_color) +
-                "\n" +
-                colorizer.wrap("│ ", SuperDiff.configuration.border_color) +
-                "‹ › in both expected and actual" +
-                colorizer.wrap(" │", SuperDiff.configuration.border_color) +
-                "\n" +
-                colorizer.wrap(
-                  "└─────────────────────────────────┘",
-                  SuperDiff.configuration.border_color
-                )
+    if SuperDiff::RSpec.rspec_version < "3.13.0"
+      class ExpectedsForMultipleDiffs
+        SuperDiff.insert_singleton_overrides(self) do
+          # Add a key for different sides
+          def from(expected)
+            return expected if self === expected
+
+            text = colorizer.wrap("Diff:", SuperDiff.configuration.header_color)
+
+            if SuperDiff.configuration.key_enabled?
+              text +=
+                "\n\n" +
+                  colorizer.wrap(
+                    "┌ (Key) ──────────────────────────┐",
+                    SuperDiff.configuration.border_color
+                  ) + "\n" +
+                  colorizer.wrap("│ ", SuperDiff.configuration.border_color) +
+                  colorizer.wrap(
+                    "‹-› in expected, not in actual",
+                    SuperDiff.configuration.expected_color
+                  ) +
+                  colorizer.wrap("  │", SuperDiff.configuration.border_color) +
+                  "\n" +
+                  colorizer.wrap("│ ", SuperDiff.configuration.border_color) +
+                  colorizer.wrap(
+                    "‹+› in actual, not in expected",
+                    SuperDiff.configuration.actual_color
+                  ) +
+                  colorizer.wrap("  │", SuperDiff.configuration.border_color) +
+                  "\n" +
+                  colorizer.wrap("│ ", SuperDiff.configuration.border_color) +
+                  "‹ › in both expected and actual" +
+                  colorizer.wrap(" │", SuperDiff.configuration.border_color) +
+                  "\n" +
+                  colorizer.wrap(
+                    "└─────────────────────────────────┘",
+                    SuperDiff.configuration.border_color
+                  )
+            end
+
+            new([[expected, text]])
           end
 
-          new([[expected, text]])
+          def colorizer
+            RSpec::Core::Formatters::ConsoleCodes
+          end
         end
 
-        def colorizer
-          RSpec::Core::Formatters::ConsoleCodes
+        SuperDiff.insert_overrides(self) do
+          # Add an extra line break
+          def message_with_diff(message, differ, actual)
+            diff = diffs(differ, actual)
+
+            diff.empty? ? message : "#{message.rstrip}\n\n#{diff}"
+          end
+
+          private
+
+          # Add extra line breaks in between diffs, and colorize the word "Diff"
+          def diffs(differ, actual)
+            @expected_list
+              .map do |(expected, diff_label)|
+                diff = differ.diff(actual, expected)
+                next if diff.strip.empty?
+                diff_label + diff
+              end
+              .compact
+              .join("\n\n")
+          end
         end
       end
+    else
+      class MultiMatcherDiff
+        SuperDiff.insert_singleton_overrides(self) do
+          # Add a key for different sides
+          def from(expected, actual)
+            return expected if self === expected
+
+            text = colorizer.wrap("Diff:", SuperDiff.configuration.header_color)
+
+            if SuperDiff.configuration.key_enabled?
+              text +=
+                "\n\n" +
+                  colorizer.wrap(
+                    "┌ (Key) ──────────────────────────┐",
+                    SuperDiff.configuration.border_color
+                  ) + "\n" +
+                  colorizer.wrap("│ ", SuperDiff.configuration.border_color) +
+                  colorizer.wrap(
+                    "‹-› in expected, not in actual",
+                    SuperDiff.configuration.expected_color
+                  ) +
+                  colorizer.wrap("  │", SuperDiff.configuration.border_color) +
+                  "\n" +
+                  colorizer.wrap("│ ", SuperDiff.configuration.border_color) +
+                  colorizer.wrap(
+                    "‹+› in actual, not in expected",
+                    SuperDiff.configuration.actual_color
+                  ) +
+                  colorizer.wrap("  │", SuperDiff.configuration.border_color) +
+                  "\n" +
+                  colorizer.wrap("│ ", SuperDiff.configuration.border_color) +
+                  "‹ › in both expected and actual" +
+                  colorizer.wrap(" │", SuperDiff.configuration.border_color) +
+                  "\n" +
+                  colorizer.wrap(
+                    "└─────────────────────────────────┘",
+                    SuperDiff.configuration.border_color
+                  )
+            end
 
-      SuperDiff.insert_overrides(self) do
-        # Add an extra line break
-        def message_with_diff(message, differ, actual)
-          diff = diffs(differ, actual)
+            new([[expected, text, actual]])
+          end
 
-          diff.empty? ? message : "#{message.rstrip}\n\n#{diff}"
+          def colorizer
+            RSpec::Core::Formatters::ConsoleCodes
+          end
         end
 
-        private
+        SuperDiff.insert_overrides(self) do
+          # Add an extra line break
+          def message_with_diff(message, differ)
+            diff = diffs(differ)
+
+            diff.empty? ? message : "#{message.rstrip}\n\n#{diff}"
+          end
 
-        # Add extra line breaks in between diffs, and colorize the word "Diff"
-        def diffs(differ, actual)
-          @expected_list
-            .map do |(expected, diff_label)|
-              diff = differ.diff(actual, expected)
-              next if diff.strip.empty?
-              diff_label + diff
-            end
-            .compact
-            .join("\n\n")
+          private
+
+          # Add extra line breaks in between diffs, and colorize the word "Diff"
+          def diffs(differ)
+            @expected_list
+              .map do |(expected, diff_label, actual)|
+                diff = differ.diff(actual, expected)
+                next if diff.strip.empty?
+                diff_label + diff
+              end
+              .compact
+              .join("\n\n")
+          end
         end
       end
     end