diff --git a/composer.json b/composer.json
index f73bdd0..c1d4393 100644
--- a/composer.json
+++ b/composer.json
@@ -9,6 +9,7 @@
         "php": "^5.3.0 || ^7.0 || ^8.0"
     },
     "require-dev": {
+        "ext-mysqli": "*",
         "phpunit/phpunit": "^4.8 || ^5.7 || ^8.5.31",
         "phpunit/phpunit-selenium": "*",
         "yoast/phpunit-polyfills": "*"