diff --git a/composer.json b/composer.json
index 74fbb7e..034f5b8 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
         "php": "~8.3.0 || ~8.4.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^12.3.7",
+        "phpunit/phpunit": "^12.3.10",
         "slam/php-cs-fixer-extensions": "^3.12.0"
     },
     "autoload": {
diff --git a/lib/r.php b/lib/r.php
index 67811c9..de631ff 100644
--- a/lib/r.php
+++ b/lib/r.php
@@ -177,7 +177,7 @@ public static function dump(mixed $var, int $maxDepth = 2, bool $stripTags = tru
             return $dumpText;
         }
 
-        public static function export(mixed $var, int $maxDepth): null|array|bool|float|int|\stdClass|string
+        public static function export(mixed $var, int $maxDepth): array|bool|float|int|\stdClass|string|null
         {
             $isObj  = \is_object($var);