diff --git a/php/composer.json b/php/composer.json
index 51cc08852..e0799bf53 100644
--- a/php/composer.json
+++ b/php/composer.json
@@ -18,7 +18,7 @@
         "cucumber/messages": ">=19.1.4 <=26"
     },
     "require-dev": {
-        "phpunit/phpunit": "^10.5||^11.0",
+        "phpunit/phpunit": "12.0.2",
         "vimeo/psalm": "5.26.1",
         "friendsofphp/php-cs-fixer": "^3.51",
         "psalm/plugin-phpunit": "^0.19.0"