diff --git a/src/EventSubscriber/CspSubscriber.php b/src/EventSubscriber/CspSubscriber.php
index 98ee91f..8dd9df1 100644
--- a/src/EventSubscriber/CspSubscriber.php
+++ b/src/EventSubscriber/CspSubscriber.php
@@ -16,7 +16,7 @@ class CspSubscriber implements EventSubscriberInterface {
   /**
    * {@inheritdoc}
    */
-  public static function getSubscribedEvents() {
+  public static function getSubscribedEvents(): array {
     if (!class_exists(CspEvents::class)) {
       return [];
     }
diff --git a/tests/src/Functional/AdminSettingsFormTests.php b/tests/src/Functional/AdminSettingsFormTests.php
index 9ab163c..7f75f33 100644
--- a/tests/src/Functional/AdminSettingsFormTests.php
+++ b/tests/src/Functional/AdminSettingsFormTests.php
@@ -78,7 +78,7 @@ class AdminSettingsFormTests extends BrowserTestBase {
    *   1. A boolean indicating whether or not a validation error is expected to
    *      be thrown.
    */
-  public function pageTrackingProvider() {
+  public static function pageTrackingProvider() {
     // @codingStandardsIgnoreStart
     return [
       [