diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 7c74231a0..8d198a1b7 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -17,10 +17,6 @@ jobs:
         drupal-core: ['10.3.x']
         phpstan: ['0']
         include:
-          # Extra run to test older supported Drupal 10.1.x.
-          - php-versions: '8.1'
-            drupal-core: '10.1.x'
-            phpstan: '0'
           # Extra run to test older supported Drupal 10.2.x.
           - php-versions: '8.1'
             drupal-core: '10.2.x'
diff --git a/graphql.info.yml b/graphql.info.yml
index 90852febe..8b43f0087 100644
--- a/graphql.info.yml
+++ b/graphql.info.yml
@@ -3,6 +3,6 @@ type: module
 description: 'Base module for integrating GraphQL with Drupal.'
 package: GraphQL
 configure: graphql.config_page
-core_version_requirement: ^10.1 || ^11
+core_version_requirement: ^10.2 || ^11
 dependencies:
   - typed_data:typed_data
diff --git a/graphql.services.yml b/graphql.services.yml
index ad0c2c9a7..23c01419f 100644
--- a/graphql.services.yml
+++ b/graphql.services.yml
@@ -184,6 +184,7 @@ services:
       - '@renderer'
       - '@event_dispatcher'
       - '@image.factory'
+      - '@file.validator'
 
   plugin.manager.graphql.persisted_query:
     class: Drupal\graphql\Plugin\PersistedQueryPluginManager
diff --git a/src/GraphQL/Utility/FileUpload.php b/src/GraphQL/Utility/FileUpload.php
index 7543ea5c7..6d4cb62ef 100644
--- a/src/GraphQL/Utility/FileUpload.php
+++ b/src/GraphQL/Utility/FileUpload.php
@@ -17,9 +17,11 @@
 use Drupal\Core\Render\RenderContext;
 use Drupal\Core\Render\RendererInterface;
 use Drupal\Core\Session\AccountProxyInterface;
+use Drupal\Core\StringTranslation\ByteSizeMarkup;
 use Drupal\Core\StringTranslation\StringTranslationTrait;
 use Drupal\Core\Utility\Token;
 use Drupal\file\FileInterface;
+use Drupal\file\Validation\FileValidatorInterface;
 use Drupal\graphql\GraphQL\Response\FileUploadResponse;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\HttpFoundation\File\UploadedFile;
@@ -111,6 +113,13 @@ class FileUpload {
    */
   protected $imageFactory;
 
+  /**
+   * The file validator service.
+   *
+   * @var \Drupal\file\Validation\FileValidatorInterface
+   */
+  protected FileValidatorInterface $fileValidator;
+
   /**
    * Constructor.
    */
@@ -126,6 +135,7 @@ public function __construct(
     RendererInterface $renderer,
     EventDispatcherInterface $eventDispatcher,
     ImageFactory $image_factory,
+    FileValidatorInterface $file_validator,
   ) {
     /** @var \Drupal\file\FileStorageInterface $file_storage */
     $file_storage = $entityTypeManager->getStorage('file');
@@ -140,6 +150,7 @@ public function __construct(
     $this->renderer = $renderer;
     $this->eventDispatcher = $eventDispatcher;
     $this->imageFactory = $image_factory;
+    $this->fileValidator = $file_validator;
   }
 
   /**
@@ -193,10 +204,7 @@ public function saveFileUpload(UploadedFile $uploaded_file, array $settings): Fi
     switch ($uploaded_file->getError()) {
       case UPLOAD_ERR_INI_SIZE:
       case UPLOAD_ERR_FORM_SIZE:
-        // @todo Drupal 10.1 compatibility, needs to be converted to
-        // ByteSizeMarkup later.
-        // @phpstan-ignore-next-line
-        $maxUploadSize = format_size($this->getMaxUploadSize($settings));
+        $maxUploadSize = ByteSizeMarkup::create($this->getMaxUploadSize($settings));
         $response->addViolation($this->t('The file @file could not be saved because it exceeds @maxsize, the maximum allowed size for uploads.', [
           '@file' => $uploaded_file->getClientOriginalName(),
           '@maxsize' => $maxUploadSize,
@@ -272,11 +280,8 @@ public function saveFileUpload(UploadedFile $uploaded_file, array $settings): Fi
       // before it is saved.
       $file->setSize(@filesize($temp_file_path));
 
-      // Validate against file_validate() first with the temporary path.
-      // @todo Drupal 10.1 compatibility, needs to be converted to file validate
-      // service later.
-      // @phpstan-ignore-next-line
-      $errors = file_validate($file, $validators);
+      // Validate against fileValidator first with the temporary path.
+      $errors = $this->fileValidator->validate($file, $validators);
       $maxResolution = $settings['max_resolution'] ?? 0;
       $minResolution = $settings['min_resolution'] ?? 0;
       if (!empty($maxResolution) || !empty($minResolution)) {
diff --git a/tests/src/Kernel/GraphQLTestBase.php b/tests/src/Kernel/GraphQLTestBase.php
index 20425566f..f60b5338d 100644
--- a/tests/src/Kernel/GraphQLTestBase.php
+++ b/tests/src/Kernel/GraphQLTestBase.php
@@ -50,6 +50,7 @@ abstract class GraphQLTestBase extends KernelTestBase {
     'content_translation',
     'entity_reference_test',
     'field',
+    'file',
     'menu_link_content',
     'link',
     'typed_data',