diff --git a/composer.json b/composer.json
index ee71913..af5ad03 100644
--- a/composer.json
+++ b/composer.json
@@ -37,7 +37,7 @@
         "szepeviktor/phpstan-wordpress": "^1.0",
         "php-stubs/wordpress-stubs": "^5.9.0",
         "roots/wordpress": "^5.9",
-        "wp-phpunit/wp-phpunit": "^5.9",
+        "wp-phpunit/wp-phpunit": "^6.1",
         "symfony/var-dumper": "4.*",
         "yoast/phpunit-polyfills": "^1.0.0",
         "gin0115/wpunit-helpers": "~1.0.0",