diff --git a/composer.json b/composer.json
index 90a2967..f2f8022 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
         "psr/simple-cache": "^3.0.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.6",
+        "phpunit/phpunit": "^11.3",
         "mikey179/vfsstream": "^1.6",
         "squizlabs/php_codesniffer": "^3.7",
         "silverstripe/standards": "^1",