diff --git a/src/ComplexResultBucket.php b/src/ComplexResultBucket.php
index 7c421de..cfa7386 100644
--- a/src/ComplexResultBucket.php
+++ b/src/ComplexResultBucket.php
@@ -49,9 +49,7 @@ public function reasons(): ?array
     {
         return array_reduce(
             array_map(
-                function (Contract\RejectionResultBucketInterface $rejection): ?array {
-                    return $rejection->reasons();
-                },
+                fn(Contract\RejectionResultBucketInterface $rejection): ?array => $rejection->reasons(),
                 $this->rejections
             ),
             function (array $carry, ?array $item): array {
@@ -68,9 +66,7 @@ public function exceptions(): ?array
     {
         return array_reduce(
             array_map(
-                function (Contract\RejectionResultBucketInterface $rejection): ?array {
-                    return $rejection->exceptions();
-                },
+                fn(Contract\RejectionResultBucketInterface $rejection): ?array => $rejection->exceptions(),
                 $this->rejections
             ),
             function (array $carry, ?array $item): array {
diff --git a/src/RejectionResultBucket.php b/src/RejectionResultBucket.php
index 177d2c1..6187e40 100644
--- a/src/RejectionResultBucket.php
+++ b/src/RejectionResultBucket.php
@@ -18,8 +18,8 @@ final class RejectionResultBucket implements Contract\RejectionResultBucketInter
 
     /** @param Type ...$values */
     public function __construct(
-        private string $reason,
-        private \Throwable $exception,
+        private readonly string $reason,
+        private readonly \Throwable $exception,
         ...$values,
     ) {
         $this->values = array_values($values);