diff --git a/composer.json b/composer.json
index 913471a..bcecda6 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
     "opis/json-schema": "^2.3"
   },
   "require-dev": {
-    "phpunit/phpunit": "^12.0"
+    "phpunit/phpunit": "^12.0 || ^13.0"
   },
   "autoload": {
     "psr-4": {