diff --git a/composer.json b/composer.json
index aa72084..c68c736 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
     },
     "require-dev": {
         "interaction-design-foundation/coding-standard": "^0.2.0",
-        "orchestra/testbench": "^8.3",
+        "orchestra/testbench": "^9.0",
         "phpunit/phpunit": "^10.5 || ^11.0",
         "vimeo/psalm": "^5.22"
     },