diff --git a/.github/workflows/build-8.x-1.x.yml b/.github/workflows/build-8.x-1.x.yml
index 53304b042..5216753b9 100644
--- a/.github/workflows/build-8.x-1.x.yml
+++ b/.github/workflows/build-8.x-1.x.yml
@@ -23,7 +23,7 @@ jobs:
       matrix:
         php-versions: ["7.3", "7.4"]
         test-suite: ["kernel", "functional", "functional-javascript"]
-        drupal-version: ["8.9.11", "9.1.1"]
+        drupal-version: ["8.9.11", "9.1.5"]
 
     name: PHP ${{ matrix.php-versions }} drupal ${{ matrix.drupal-version }} test-suite ${{ matrix.test-suite }}
 
diff --git a/modules/islandora_iiif/src/Plugin/views/style/IIIFManifest.php b/modules/islandora_iiif/src/Plugin/views/style/IIIFManifest.php
index 2479c8395..073ca04e8 100644
--- a/modules/islandora_iiif/src/Plugin/views/style/IIIFManifest.php
+++ b/modules/islandora_iiif/src/Plugin/views/style/IIIFManifest.php
@@ -10,7 +10,7 @@
 use Symfony\Component\Serializer\SerializerInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Drupal\Core\Config\ImmutableConfig;
-use Drupal\Core\File\FileSystem;
+use Drupal\Core\File\FileSystemInterface;
 use GuzzleHttp\Client;
 use GuzzleHttp\Exception\ClientException;
 use GuzzleHttp\Exception\ConnectException;
@@ -85,7 +85,7 @@ class IIIFManifest extends StylePluginBase {
   /**
    * {@inheritdoc}
    */
-  public function __construct(array $configuration, $plugin_id, $plugin_definition, SerializerInterface $serializer, Request $request, ImmutableConfig $iiif_config, FileSystem $file_system, Client $http_client, MessengerInterface $messenger) {
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, SerializerInterface $serializer, Request $request, ImmutableConfig $iiif_config, FileSystemInterface $file_system, Client $http_client, MessengerInterface $messenger) {
     parent::__construct($configuration, $plugin_id, $plugin_definition);
 
     $this->serializer = $serializer;