diff --git a/makefile b/makefile
index 0a3f0ece1..6a68f6598 100644
--- a/makefile
+++ b/makefile
@@ -78,7 +78,7 @@ phpcheck: ## Starts the PHP syntax checks
 	@find . -name '*.php' -not -path "./vendor/*" -not -path "./tests/*" | xargs -n 1 -P4 php -l
 
 phpmin: ## Starts the PHP compatibility checks
-	@php vendor/bin/phpcs -p --standard=PHPCompatibility --extensions=php --runtime-set testVersion 7.2 ./src
+	@php vendor/bin/phpcs -p --standard=PHPCompatibility --extensions=php --runtime-set testVersion 7.4 ./src
 
 csfix: ## Starts the PHP CS Fixer
 	@PHP_CS_FIXER_IGNORE_ENV=1 php vendor/bin/php-cs-fixer fix --config=./.php_cs.php --dry-run
diff --git a/src/Components/CancelManager/CancelItemFacade.php b/src/Components/CancelManager/CancelItemFacade.php
index 22e9c22d9..b183b1123 100644
--- a/src/Components/CancelManager/CancelItemFacade.php
+++ b/src/Components/CancelManager/CancelItemFacade.php
@@ -4,6 +4,7 @@
 namespace Kiener\MolliePayments\Components\CancelManager;
 
 use Kiener\MolliePayments\Factory\MollieApiFactory;
+use Mollie\Api\MollieApiClient;
 use Psr\Log\LoggerInterface;
 
 /**
@@ -11,11 +12,10 @@
  */
 class CancelItemFacade
 {
-    /** @var \Mollie\Api\MollieApiClient */
-    private $client;
+    private MollieApiClient $client;
 
-    /** @var LoggerInterface */
-    private $logger;
+
+    private LoggerInterface $logger;
 
     public function __construct(MollieApiFactory $clientFactory, LoggerInterface $logger)
     {
@@ -57,12 +57,10 @@ public function cancelItem(string $orderId, string $mollieLineId, int $quantity,
             $this->logger->info('Item cancelled successful', ['orderId' => $orderId, 'mollieLineId' => $mollieLineId, 'quantity' => $quantity]);
 
             $response = $response->withData($lines);
-
         } catch (\Throwable $e) {
             $response = $response->failedWithMessage($e->getMessage());
         }
 
         return $response;
     }
-
-}
\ No newline at end of file
+}
diff --git a/src/Components/CancelManager/CancelItemResponse.php b/src/Components/CancelManager/CancelItemResponse.php
index 2cdc70c85..cb2736f60 100644
--- a/src/Components/CancelManager/CancelItemResponse.php
+++ b/src/Components/CancelManager/CancelItemResponse.php
@@ -8,9 +8,12 @@
  */
 class CancelItemResponse implements \JsonSerializable
 {
-    private $message;
-    private $success = true;
+    private string $message;
+    private bool $success = true;
 
+    /**
+     * @var array<mixed>
+     */
     private array $data = [];
 
     public function isSuccessful(): bool
@@ -19,14 +22,17 @@ public function isSuccessful(): bool
     }
 
     /**
-     * @return mixed
+     * @return string
      */
-    public function getMessage()
+    public function getMessage(): string
     {
         return $this->message;
     }
 
 
+    /**
+     * @return false|string
+     */
     public function jsonSerialize(): mixed
     {
         return json_encode(['success' => $this->success, 'message' => $this->message]);
@@ -40,6 +46,10 @@ public function failedWithMessage(string $message): self
         return $clone;
     }
 
+    /**
+     * @param array<mixed> $data
+     * @return $this
+     */
     public function withData(array $data): self
     {
         $clone = clone $this;
@@ -47,9 +57,11 @@ public function withData(array $data): self
         return $clone;
     }
 
-    public function getData():array
+    /**
+     * @return array<mixed>
+     */
+    public function getData(): array
     {
         return $this->data;
     }
-
-}
\ No newline at end of file
+}
diff --git a/src/Controller/Api/Order/CancelLineController.php b/src/Controller/Api/Order/CancelLineController.php
index cd0d0490e..d30353686 100644
--- a/src/Controller/Api/Order/CancelLineController.php
+++ b/src/Controller/Api/Order/CancelLineController.php
@@ -15,13 +15,11 @@
 
 class CancelLineController extends AbstractController
 {
-
     private MollieApiFactory $clientFactory;
     private CancelItemFacade $cancelItemFacade;
 
     public function __construct(MollieApiFactory $clientFactory, CancelItemFacade $cancelItemFacade)
     {
-
         $this->clientFactory = $clientFactory;
         $this->cancelItemFacade = $cancelItemFacade;
     }
@@ -67,4 +65,4 @@ public function cancelAction(Request $request, Context $context): Response
         $result = $this->cancelItemFacade->cancelItem($orderId, $mollieLineId, $quantity, $resetStock);
         return new JsonResponse($result);
     }
-}
\ No newline at end of file
+}