diff --git a/composer.json b/composer.json
index 138d0f5..4a5699d 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
         }
     ],
     "require": {
-        "php": "~8.1 || ~8.2 || ~8.3",
+        "php": "~8.1 || ~8.2 || ~8.3 || ~8.4",
         "symfony/translation": "~5.4||~6.4||~7",
         "symfony/yaml": "~5.4||~6.4||~7",
         "aeon-php/calendar": "^1.0"
diff --git a/src/Coduo/PHPHumanizer/Collection/Formatter.php b/src/Coduo/PHPHumanizer/Collection/Formatter.php
index 79d8eac..57c62e8 100644
--- a/src/Coduo/PHPHumanizer/Collection/Formatter.php
+++ b/src/Coduo/PHPHumanizer/Collection/Formatter.php
@@ -30,7 +30,7 @@ public function __construct(TranslatorInterface $translator, string $catalogue =
      *
      * @param array<string> $collection
      */
-    public function format(array $collection, int $limit = null) : string
+    public function format(array $collection, ?int $limit = null) : string
     {
         $count = \count($collection);
 
diff --git a/src/Coduo/PHPHumanizer/Collection/Oxford.php b/src/Coduo/PHPHumanizer/Collection/Oxford.php
index 2ec61ef..932a297 100644
--- a/src/Coduo/PHPHumanizer/Collection/Oxford.php
+++ b/src/Coduo/PHPHumanizer/Collection/Oxford.php
@@ -23,7 +23,7 @@ public function __construct(Formatter $formatter)
     /**
      * @param array<string> $collection
      */
-    public function format(array $collection, int $limit = null) : string
+    public function format(array $collection, ?int $limit = null) : string
     {
         return $this->formatter->format($collection, $limit);
     }
diff --git a/src/Coduo/PHPHumanizer/CollectionHumanizer.php b/src/Coduo/PHPHumanizer/CollectionHumanizer.php
index dc83f80..7077348 100644
--- a/src/Coduo/PHPHumanizer/CollectionHumanizer.php
+++ b/src/Coduo/PHPHumanizer/CollectionHumanizer.php
@@ -20,7 +20,7 @@ final class CollectionHumanizer
     /**
      * @param array<string> $collection
      */
-    public static function oxford(array $collection, int $limit = null, string $locale = 'en') : string
+    public static function oxford(array $collection, ?int $limit = null, string $locale = 'en') : string
     {
         $oxford = new Oxford(
             new Formatter(Builder::build($locale))
diff --git a/src/Coduo/PHPHumanizer/String/BinarySuffix.php b/src/Coduo/PHPHumanizer/String/BinarySuffix.php
index 9332d4a..a522482 100644
--- a/src/Coduo/PHPHumanizer/String/BinarySuffix.php
+++ b/src/Coduo/PHPHumanizer/String/BinarySuffix.php
@@ -34,7 +34,7 @@ final class BinarySuffix
         0 => '# bytes',
     ];
 
-    public function __construct(int $number, string $locale = 'en', int $precision = null)
+    public function __construct(int $number, string $locale = 'en', ?int $precision = null)
     {
         if (!\class_exists(\NumberFormatter::class)) {
             throw new \RuntimeException('Binary suffix converter requires intl extension!');