diff --git a/composer.json b/composer.json
index 3b5aa3b..36c8b7c 100644
--- a/composer.json
+++ b/composer.json
@@ -38,7 +38,7 @@
 		"rector/rector": "0.17.10",
 		"roots/wordpress": "^6.5",
 		"syntatis/coding-standard": "^1.3",
-		"wp-phpunit/wp-phpunit": "^6.5",
+		"wp-phpunit/wp-phpunit": "^6.6",
 		"yoast/phpunit-polyfills": "^2.0"
 	},
 	"scripts": {