diff --git a/composer.json b/composer.json
index f6eccb9..a696652 100644
--- a/composer.json
+++ b/composer.json
@@ -11,6 +11,7 @@
         }
     ],
     "require": {
+        "ext-pdo": "*",
         "monolog/monolog": ">1.4.0",
         "ext-pdo_mysql": "*"
     },