diff --git a/composer.json b/composer.json
index 294f844..61e7d97 100644
--- a/composer.json
+++ b/composer.json
@@ -20,7 +20,7 @@
         "silverstripe/versioned": "^1.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9",
+        "phpunit/phpunit": "^9.5",
         "squizlabs/php_codesniffer": "^3.0"
     },
     "extra": {
@@ -38,4 +38,4 @@
     "license": "BSD-3-Clause",
     "minimum-stability": "dev",
     "prefer-stable": true
-}
\ No newline at end of file
+}