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diff --git a/web/modules/contrib/libraries/src/Config/LibrariesConfigSubscriber.php b/web/modules/contrib/libraries/src/Config/LibrariesConfigSubscriber.php
new file mode 100644
index 000000000..6578f42c6
--- /dev/null
+++ b/web/modules/contrib/libraries/src/Config/LibrariesConfigSubscriber.php
@@ -0,0 +1,51 @@
+<?php
+
+namespace Drupal\libraries\Config;
+
+use Drupal\Core\Config\ConfigCrudEvent;
+use Drupal\Core\Config\ConfigEvents;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+ * Reacts to configuration changes of the 'libraries.settings' configuration.
+ */
+class LibrariesConfigSubscriber implements EventSubscriberInterface {
+
+  /**
+   * The service container.
+   *
+   * @var \Symfony\Component\DependencyInjection\ContainerInterface
+   */
+  protected $container;
+
+  /**
+   * Constructs a Libraries API configuration subscriber.
+   *
+   * @param \Symfony\Component\DependencyInjection\ContainerInterface $container
+   *   The service container.
+   */
+  public function __construct(ContainerInterface $container) {
+    $this->container = $container;
+  }
+
+  /**
+   * Unsets the definition discovery service when its configuration changes.
+   *
+   * @param \Drupal\Core\Config\ConfigCrudEvent $event
+   *   The configuration event.
+   */
+  public function onConfigSave(ConfigCrudEvent $event) {
+    if (($event->getConfig()->getName() === 'libraries.settings') && $event->isChanged('definition')) {
+      $this->container->set('libraries.definition.discovery', NULL);
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getSubscribedEvents() {
+    return [ConfigEvents::SAVE => 'onConfigSave'];
+  }
+
+}