diff --git a/composer.json b/composer.json
index 92da359..07aa99c 100644
--- a/composer.json
+++ b/composer.json
@@ -7,6 +7,7 @@
 		"silverstripe/framework": "4.0.x-dev",
 		"silverstripe/config": "1.0.x-dev",
 		"silverstripe/admin": "1.0.x-dev",
+		"silverstripe/assets": "1.0.x-dev",
 		"silverstripe/reports": "4.0.x-dev",
 		"silverstripe/siteconfig": "4.0.x-dev",
 		"silverstripe-themes/simple": "~3.2.0",