diff --git a/composer.json b/composer.json
index 79536f3..6e0a928 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
         "php": ">=7.4"
     },
     "require-dev": {
-        "phpunit/phpunit": ">=7",
+        "phpunit/phpunit": "^9",
         "wp-coding-standards/wpcs": "^3.0.0",
         "yoast/phpunit-polyfills": "^2.0"
     },