diff --git a/package.json b/package.json
index e57c9a1e..c05aad97 100644
--- a/package.json
+++ b/package.json
@@ -35,6 +35,7 @@
     "howler": "2.0.2",
     "json-loader": "0.5.4",
     "lodash": "4.17.2",
+    "matter-js": "0.11.1",
     "node-uuid": "1.4.7",
     "outdent": "0.3.0",
     "react": "15.4.1",