diff --git a/composer.json b/composer.json
index 204d7e5..58b7dca 100644
--- a/composer.json
+++ b/composer.json
@@ -27,6 +27,7 @@
 	"prefer-stable": true,
 	"require": {
 		"php": ">=5.3.6",
+		"pattern-lab/core": "0.*",
 		"pattern-lab/patternengine-twig": "0.*",
 		"pattern-lab/styleguidekit-twig-default": "0.*"
 	},