diff --git a/composer.json b/composer.json
index 12dc4d8..bbb2482 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
         "php-parallel-lint/php-parallel-lint": "^1.4",
         "phpstan/phpstan": "^2.0",
         "phpstan/phpstan-strict-rules": "^2.0",
-        "phpunit/phpunit": "^12.0"
+        "phpunit/phpunit": "^12.0 || ^13.0"
     },
     "suggest": {
         "ext-intl": "Best-quality alias transliteration (Any-Latin; Latin-ASCII). Without it, and without ext-iconv, transliteration falls back to raw ASCII.",