diff --git a/composer.json b/composer.json
index 4abb1c8..cd1c8b4 100644
--- a/composer.json
+++ b/composer.json
@@ -15,6 +15,7 @@
 		}
 	],
 	"require": {
+		"silverstripe/framework": "~3.1"
 	},
 	"extra": {
 		"installer-name": "schedulizer",