diff --git a/composer.json b/composer.json
index 22a657fb..86dbaa57 100644
--- a/composer.json
+++ b/composer.json
@@ -32,7 +32,7 @@
         "cmd/s2c"
     ],
     "require-dev": {
-        "phpunit/phpunit": "^10.5",
+        "phpunit/phpunit": "^13.1",
         "vimeo/psalm": "^6.14.3",
         "phpstan/phpstan": "^2.1.2",
         "phpspec/prophecy": "^1.17",