diff --git a/vendor/magento/module-catalog/Model/System/Config/Backend/Rss/Category.php b/vendor/magento/module-catalog/Model/System/Config/Backend/Rss/Category.php
new file mode 100644
index 00000000000..0df9da31f80
--- /dev/null
+++ b/vendor/magento/module-catalog/Model/System/Config/Backend/Rss/Category.php
@@ -0,0 +1,69 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\Catalog\Model\System\Config\Backend\Rss;
+
+use Magento\Catalog\Api\Data\ProductInterface;
+use Magento\Catalog\Api\ProductAttributeRepositoryInterface;
+use Magento\Framework\App\Cache\TypeListInterface;
+use Magento\Framework\App\Config\ScopeConfigInterface;
+use Magento\Framework\App\Config\Value as ConfigValue;
+use Magento\Framework\App\ObjectManager;
+use Magento\Framework\Data\Collection\AbstractDb;
+use Magento\Framework\Model\Context;
+use Magento\Framework\Model\ResourceModel\AbstractResource;
+use Magento\Framework\Registry;
+
+class Category extends ConfigValue
+{
+    /**
+     * @var ProductAttributeRepositoryInterface
+     */
+    private $productAttributeRepository;
+
+    /**
+     * @param Context $context
+     * @param Registry $registry
+     * @param ScopeConfigInterface $config
+     * @param TypeListInterface $cacheTypeList
+     * @param AbstractResource|null $resource
+     * @param AbstractDb|null $resourceCollection
+     * @param array $data
+     * @param ProductAttributeRepositoryInterface|null $productAttributeRepository
+     */
+    public function __construct(
+        Context $context,
+        Registry $registry,
+        ScopeConfigInterface $config,
+        TypeListInterface $cacheTypeList,
+        AbstractResource $resource = null,
+        AbstractDb $resourceCollection = null,
+        array $data = [],
+        ProductAttributeRepositoryInterface $productAttributeRepository = null
+    ) {
+        parent::__construct($context, $registry, $config, $cacheTypeList, $resource, $resourceCollection, $data);
+
+        $this->productAttributeRepository = $productAttributeRepository ??
+            ObjectManager::getInstance()->get(ProductAttributeRepositoryInterface::class);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function afterSave()
+    {
+        if ($this->isValueChanged() && $this->getValue()) {
+            $updatedAtAttr = $this->productAttributeRepository->get(ProductInterface::UPDATED_AT);
+            if (!$updatedAtAttr->getUsedForSortBy()) {
+                $updatedAtAttr->setUsedForSortBy(true);
+                $this->productAttributeRepository->save($updatedAtAttr);
+            }
+        }
+
+        return parent::afterSave();
+    }
+}
diff --git a/vendor/magento/module-catalog/etc/adminhtml/system.xml b/vendor/magento/module-catalog/etc/adminhtml/system.xml
index a1b2202309d..fa6d6df5d9d 100644
--- a/vendor/magento/module-catalog/etc/adminhtml/system.xml
+++ b/vendor/magento/module-catalog/etc/adminhtml/system.xml
@@ -199,6 +199,7 @@
                 <field id="category" translate="label" type="select" sortOrder="14" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Top Level Category</label>
                     <source_model>Magento\Config\Model\Config\Source\Enabledisable</source_model>
+                    <backend_model>Magento\Catalog\Model\System\Config\Backend\Rss\Category</backend_model>
                 </field>
             </group>
         </section>