diff --git a/Library/Homebrew/bundle_version.rb b/Library/Homebrew/bundle_version.rb
index 8bf70d76ea..92c522659a 100644
--- a/Library/Homebrew/bundle_version.rb
+++ b/Library/Homebrew/bundle_version.rb
@@ -30,15 +30,15 @@ module Homebrew
 
     sig { params(package_info_path: Pathname).returns(T.nilable(T.attached_class)) }
     def self.from_package_info(package_info_path)
-      Homebrew.install_bundler_gems!
-      require "nokogiri"
+      require "rexml/document"
 
-      xml = Nokogiri::XML(package_info_path.read)
+      xml = REXML::Document.new(package_info_path.read)
 
-      bundle_id = xml.xpath("//pkg-info//bundle-version//bundle").first&.attr("id")
-      return unless bundle_id
+      bundle_version_bundle = xml.get_elements("//pkg-info//bundle-version//bundle").first
+      bundle_id = bundle_version_bundle["id"] if bundle_version_bundle
+      return if bundle_id.blank?
 
-      bundle = xml.xpath("//pkg-info//bundle").find { |b| b["id"] == bundle_id }
+      bundle = xml.get_elements("//pkg-info//bundle").find { |b| b["id"] == bundle_id }
       return unless bundle
 
       short_version = bundle["CFBundleShortVersionString"]
diff --git a/Library/Homebrew/unversioned_cask_checker.rb b/Library/Homebrew/unversioned_cask_checker.rb
index 01c7538f21..462d43990a 100644
--- a/Library/Homebrew/unversioned_cask_checker.rb
+++ b/Library/Homebrew/unversioned_cask_checker.rb
@@ -176,13 +176,13 @@ module Homebrew
 
             distribution_path = extract_dir/"Distribution"
             if distribution_path.exist?
-              Homebrew.install_bundler_gems!
-              require "nokogiri"
+              require "rexml/document"
 
-              xml = Nokogiri::XML(distribution_path.read)
+              xml = REXML::Document.new(distribution_path.read)
 
-              product_version = xml.xpath("//installer-gui-script//product").first&.attr("version")
-              return product_version if product_version
+              product = xml.get_elements("//installer-gui-script//product").first
+              product_version = product["version"] if product
+              return product_version if product_version.present?
             end
 
             opoo "#{pkg_path.basename} contains multiple packages: #{packages}" if packages.count != 1