diff --git a/composer.json b/composer.json
index 59d2fb8..6232c5a 100644
--- a/composer.json
+++ b/composer.json
@@ -28,7 +28,7 @@
         "szepeviktor/phpstan-wordpress": "<=1.3.2",
         "php-stubs/wordpress-stubs": "6.6.*",
         "roots/wordpress": "6.6.*",
-        "wp-phpunit/wp-phpunit": "6.6.*",
+        "wp-phpunit/wp-phpunit": "6.6.* || 6.8.*",
         "wp-cli/i18n-command": "*",
         "squizlabs/php_codesniffer": "3.*",
         "dealerdirect/phpcodesniffer-composer-installer": "*",