diff --git a/composer.json b/composer.json
index 23abce4..d2cd302 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
 		"dealerdirect/phpcodesniffer-composer-installer": "^0.4.1 || ^0.5 || ^0.6.2 || ^0.7",
 		"php-parallel-lint/php-parallel-lint": "^1.0",
 		"phpcompatibility/phpcompatibility-wp": "^2.1",
-		"phpunit/phpunit": "^4 || ^5 || ^6 || ^7",
+		"phpunit/phpunit": "^8.5.52 || ^9.6.33",
 		"squizlabs/php_codesniffer": "^3.5",
 		"wp-coding-standards/wpcs": "^2.3.0",
 		"yoast/phpunit-polyfills": "^0.2.0"