diff --git a/composer.json b/composer.json
index f12f10b..0efa797 100644
--- a/composer.json
+++ b/composer.json
@@ -35,6 +35,7 @@
     "ext-openssl": "*",
     "guzzlehttp/guzzle": "^7.9.2",
     "spomky-labs/base64url": "^2.0.4",
+    "symfony/polyfill-php83": "^1.33",
     "web-token/jwt-library": "^3.4.9|^4.0.6"
   },
   "suggest": {
diff --git a/phpstan.neon b/phpstan.neon
index 29ba628..d71cbd7 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -3,6 +3,8 @@ parameters:
     paths:
         - src
     reportUnmatchedIgnoredErrors: false
+    checkMissingOverrideMethodAttribute: true
+    tipsOfTheDay: false
     treatPhpDocTypesAsCertain: false
     ignoreErrors:
         - identifier: missingType.iterableValue
diff --git a/src/MessageSentReport.php b/src/MessageSentReport.php
index 27a69e6..3a94fd6 100644
--- a/src/MessageSentReport.php
+++ b/src/MessageSentReport.php
@@ -93,6 +93,7 @@ public function getResponseContent(): ?string
         return $this->response?->getBody()->getContents();
     }
 
+    #[\Override]
     public function jsonSerialize(): array
     {
         return [
diff --git a/src/Subscription.php b/src/Subscription.php
index 3639482..740145d 100644
--- a/src/Subscription.php
+++ b/src/Subscription.php
@@ -72,33 +72,25 @@ public static function create(array $associativeArray): self
         );
     }
 
-    /**
-     * {@inheritDoc}
-     */
+    #[\Override]
     public function getEndpoint(): string
     {
         return $this->endpoint;
     }
 
-    /**
-     * {@inheritDoc}
-     */
+    #[\Override]
     public function getPublicKey(): ?string
     {
         return $this->publicKey;
     }
 
-    /**
-     * {@inheritDoc}
-     */
+    #[\Override]
     public function getAuthToken(): ?string
     {
         return $this->authToken;
     }
 
-    /**
-     * {@inheritDoc}
-     */
+    #[\Override]
     public function getContentEncoding(): ?string
     {
         return $this->contentEncoding?->value;
diff --git a/tests/PushServiceTest.php b/tests/PushServiceTest.php
index e2a24cb..bea1a1a 100644
--- a/tests/PushServiceTest.php
+++ b/tests/PushServiceTest.php
@@ -34,9 +34,7 @@ final class PushServiceTest extends PHPUnit\Framework\TestCase
     /** @var WebPush WebPush with correct api keys */
     private WebPush $webPush;
 
-    /**
-     * {@inheritdoc}
-     */
+    #[\Override]
     public static function setUpBeforeClass(): void
     {
         self::$testServiceUrl = 'http://localhost:'.self::$portNumber;
diff --git a/tests/WebPushTest.php b/tests/WebPushTest.php
index b943fdb..5527a66 100644
--- a/tests/WebPushTest.php
+++ b/tests/WebPushTest.php
@@ -25,9 +25,7 @@ final class WebPushTest extends PHPUnit\Framework\TestCase
     /** @var WebPush WebPush with correct api keys */
     private WebPush $webPush;
 
-    /**
-     * {@inheritdoc}
-     */
+    #[\Override]
     public static function setUpBeforeClass(): void
     {
         self::$endpoints = [
@@ -52,9 +50,7 @@ public static function setUpBeforeClass(): void
         }
     }
 
-    /**
-     * {@inheritdoc}
-     */
+    #[\Override]
     public function setUp(): void
     {
         if (!getenv('CI')) {