diff --git a/Library/Homebrew/dev-cmd/vendor-gems.rb b/Library/Homebrew/dev-cmd/vendor-gems.rb
index 65b810ac9f..063fb9242e 100644
--- a/Library/Homebrew/dev-cmd/vendor-gems.rb
+++ b/Library/Homebrew/dev-cmd/vendor-gems.rb
@@ -1,94 +1,92 @@
 # typed: true
 # frozen_string_literal: true
 
+require "abstract_command"
 require "cli/parser"
 
 module Homebrew
-  module_function
+  module DevCmd
+    class VendorGems < AbstractCommand
+      cmd_args do
+        description <<~EOS
+          Install and commit Homebrew's vendored gems.
+        EOS
 
-  sig { returns(CLI::Parser) }
-  def vendor_gems_args
-    Homebrew::CLI::Parser.new do
-      description <<~EOS
-        Install and commit Homebrew's vendored gems.
-      EOS
+        comma_array "--update",
+                    description: "Update the specified list of vendored gems to the latest version."
+        switch      "--no-commit",
+                    description: "Do not generate a new commit upon completion."
+        switch     "--non-bundler-gems",
+                   description: "Update vendored gems that aren't using Bundler.",
+                   hidden:      true
 
-      comma_array "--update",
-                  description: "Update the specified list of vendored gems to the latest version."
-      switch      "--no-commit",
-                  description: "Do not generate a new commit upon completion."
-      switch     "--non-bundler-gems",
-                 description: "Update vendored gems that aren't using Bundler.",
-                 hidden:      true
-
-      named_args :none
-    end
-  end
-
-  sig { void }
-  def vendor_gems
-    args = vendor_gems_args.parse
-
-    Homebrew.install_bundler!
-
-    ENV["BUNDLE_WITH"] = Homebrew.valid_gem_groups.join(":")
-
-    ohai "cd #{HOMEBREW_LIBRARY_PATH}"
-    HOMEBREW_LIBRARY_PATH.cd do
-      if args.update
-        ohai "bundle update"
-        safe_system "bundle", "update", *args.update
-
-        unless args.no_commit?
-          ohai "git add Gemfile.lock"
-          system "git", "add", "Gemfile.lock"
-        end
+        named_args :none
       end
 
-      ohai "bundle install --standalone"
-      safe_system "bundle", "install", "--standalone"
+      sig { override.void }
+      def run
+        Homebrew.install_bundler!
 
-      ohai "bundle pristine"
-      safe_system "bundle", "pristine"
+        ENV["BUNDLE_WITH"] = Homebrew.valid_gem_groups.join(":")
 
-      # Workaround Bundler 2.4.21 issue where platforms may be removed.
-      # Although we don't use 2.4.21, Dependabot does as it currently ignores your lockfile version.
-      # https://github.com/rubygems/rubygems/issues/7169
-      safe_system "bundle", "lock", "--add-platform", "aarch64-linux", "arm-linux"
-      system "git", "add", "Gemfile.lock" unless args.no_commit?
+        ohai "cd #{HOMEBREW_LIBRARY_PATH}"
+        HOMEBREW_LIBRARY_PATH.cd do
+          if args.update
+            ohai "bundle update"
+            safe_system "bundle", "update", *args.update
 
-      if args.non_bundler_gems?
-        %w[
-          mechanize
-        ].each do |gem|
-          (HOMEBREW_LIBRARY_PATH/"vendor/gems").cd do
-            Pathname.glob("#{gem}-*/").each { |path| FileUtils.rm_r(path) }
+            unless args.no_commit?
+              ohai "git add Gemfile.lock"
+              system "git", "add", "Gemfile.lock"
+            end
           end
-          ohai "gem install #{gem}"
-          safe_system "gem", "install", gem, "--install-dir", "vendor",
-                      "--no-document", "--no-wrappers", "--ignore-dependencies", "--force"
-          (HOMEBREW_LIBRARY_PATH/"vendor/gems").cd do
-            source = Pathname.glob("#{gem}-*/").first
-            next if source.blank?
 
-            # We cannot use `#ln_sf` here because that has unintended consequences when
-            # the symlink we want to create exists and points to an existing directory.
-            FileUtils.rm_f gem
-            FileUtils.ln_s source, gem
+          ohai "bundle install --standalone"
+          safe_system "bundle", "install", "--standalone"
+
+          ohai "bundle pristine"
+          safe_system "bundle", "pristine"
+
+          # Workaround Bundler 2.4.21 issue where platforms may be removed.
+          # Although we don't use 2.4.21, Dependabot does as it currently ignores your lockfile version.
+          # https://github.com/rubygems/rubygems/issues/7169
+          safe_system "bundle", "lock", "--add-platform", "aarch64-linux", "arm-linux"
+          system "git", "add", "Gemfile.lock" unless args.no_commit?
+
+          if args.non_bundler_gems?
+            %w[
+              mechanize
+            ].each do |gem|
+              (HOMEBREW_LIBRARY_PATH/"vendor/gems").cd do
+                Pathname.glob("#{gem}-*/").each { |path| FileUtils.rm_r(path) }
+              end
+              ohai "gem install #{gem}"
+              safe_system "gem", "install", gem, "--install-dir", "vendor",
+                          "--no-document", "--no-wrappers", "--ignore-dependencies", "--force"
+              (HOMEBREW_LIBRARY_PATH/"vendor/gems").cd do
+                source = Pathname.glob("#{gem}-*/").first
+                next if source.blank?
+
+                # We cannot use `#ln_sf` here because that has unintended consequences when
+                # the symlink we want to create exists and points to an existing directory.
+                FileUtils.rm_f gem
+                FileUtils.ln_s source, gem
+              end
+            end
+          end
+
+          unless args.no_commit?
+            ohai "git add vendor"
+            system "git", "add", "vendor"
+
+            Utils::Git.set_name_email!
+            Utils::Git.setup_gpg!
+
+            ohai "git commit"
+            system "git", "commit", "--message", "brew vendor-gems: commit updates."
           end
         end
       end
-
-      unless args.no_commit?
-        ohai "git add vendor"
-        system "git", "add", "vendor"
-
-        Utils::Git.set_name_email!
-        Utils::Git.setup_gpg!
-
-        ohai "git commit"
-        system "git", "commit", "--message", "brew vendor-gems: commit updates."
-      end
     end
   end
 end
diff --git a/Library/Homebrew/test/dev-cmd/vendor-gems_spec.rb b/Library/Homebrew/test/dev-cmd/vendor-gems_spec.rb
index c9ef4c4fd3..f2183c524e 100644
--- a/Library/Homebrew/test/dev-cmd/vendor-gems_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/vendor-gems_spec.rb
@@ -1,7 +1,8 @@
 # frozen_string_literal: true
 
 require "cmd/shared_examples/args_parse"
+require "dev-cmd/vendor-gems"
 
-RSpec.describe "brew vendor-gems" do
+RSpec.describe Homebrew::DevCmd::VendorGems do
   it_behaves_like "parseable arguments"
 end