diff --git a/composer.json b/composer.json
index ba95f48051..6c04c49de5 100644
--- a/composer.json
+++ b/composer.json
@@ -29,6 +29,7 @@
         "symfony/console": "self.version",
         "symfony/css-selector": "self.version",
         "symfony/dependency-injection": "self.version",
+        "symfony/debug": "self.version",
         "symfony/doctrine-bridge": "self.version",
         "symfony/dom-crawler": "self.version",
         "symfony/event-dispatcher": "self.version",