diff --git a/composer.json b/composer.json
index e183811..d197aed 100644
--- a/composer.json
+++ b/composer.json
@@ -39,6 +39,7 @@
     "require-dev": {
         "ibexa/code-style": "~2.0.0",
         "ibexa/design-engine": "~6.0.x-dev",
+        "ibexa/design-system-twig": "~6.0.x-dev",
         "ibexa/doctrine-schema": "~6.0.x-dev",
         "ibexa/fieldtype-richtext": "~6.0.x-dev",
         "ibexa/http-cache": "~6.0.x-dev",