diff --git a/.woodpecker/test.yml b/.woodpecker/test.yml
index 066052b..ba95a1c 100644
--- a/.woodpecker/test.yml
+++ b/.woodpecker/test.yml
@@ -8,7 +8,8 @@ steps:
     environment:
       WP_TESTS_PHPUNIT_POLYFILLS_PATH: vendor/yoast/phpunit-polyfills
     commands:
-      - docker-php-ext-enable mysqli pdo_mysql intl gd zip
+      - docker-php-ext-install mbstring mysqli pdo_mysql intl gd zip bz2
+      - 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