diff --git a/.forgejo/workflows/phpunit.yml b/.forgejo/workflows/phpunit.yml
index eba5f27..87a545a 100644
--- a/.forgejo/workflows/phpunit.yml
+++ b/.forgejo/workflows/phpunit.yml
@@ -45,7 +45,7 @@ jobs:
         run: git clone https://code.event-federation.eu/Event-Federation/wordpress-activitypub.git $WP_CORE_DIR/wp-content/plugins/activitypub/
 
       - name: Setup Test Environment
-        run: bash bin/install-wp-tests.sh wordpress_test root root 127.0.0.1 latest
+        run: bash bin/install-wp-tests.sh wordpress_test root root 127.0.0.1 6.6
 
       - run: ls -l $WP_CORE_DIR && ls -l $WP_CORE_DIR/wp-includes && ls -l $WP_CORE_DIR/wp-includes/PHPMailer/
 
diff --git a/.woodpecker/test.yml b/.woodpecker/test.yml
index fe28da6..7e61820 100644
--- a/.woodpecker/test.yml
+++ b/.woodpecker/test.yml
@@ -14,6 +14,6 @@ steps:
       - docker-php-ext-enable mbstring mysqli pdo_mysql intl gd zip bz2
       - composer require --dev yoast/phpunit-polyfills:"^3.0"
       - composer install
-      - bash bin/install-wp-tests.sh wordpress_tests root mysql mysql latest true
+      - bash bin/install-wp-tests.sh wordpress_tests root mysql mysql 6.6 true
       - phpunit --configuration phpunit.xml.dist