diff --git a/composer.json b/composer.json
index 117399d..0131046 100644
--- a/composer.json
+++ b/composer.json
@@ -29,7 +29,7 @@
         "webmozart/assert": "^1.11|^2.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^10.0|^11.0|^12.0",
+        "phpunit/phpunit": "13.0.0",
         "squizlabs/php_codesniffer": "^4.0",
         "slevomat/coding-standard": "^8.0",
         "phpstan/phpstan": "^2.0",