diff --git a/composer.json b/composer.json
index ac1bf26..c5b5394 100644
--- a/composer.json
+++ b/composer.json
@@ -25,7 +25,7 @@
         "league/commonmark": "^2.7"
     },
     "require-dev": {
-        "phpunit/phpunit": "10.*",
+        "phpunit/phpunit": "13.*",
         "phpstan/phpstan": "2.*"
     },
     "scripts": {