diff --git a/composer.json b/composer.json
index 3d8ad84..f8c964b 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
     },
     "require-dev": {
         "interaction-design-foundation/coding-standard": "^0.3",
-        "phpunit/phpunit": "^10.1"
+        "phpunit/phpunit": "^10.1 || ^11.0"
     },
     "minimum-stability": "dev",
     "prefer-stable": true,