diff --git a/package.json b/package.json
index ec6a31e..ffa1282 100644
--- a/package.json
+++ b/package.json
@@ -22,6 +22,7 @@
   "dependencies": {
     "async": "^0.9.0",
     "brfs": "^1.4.0",
+    "earcut": "^2.0.0",
     "eventemitter3": "^1.0.1",
     "object-assign": "^2.0.0",
     "resource-loader": "^1.5.5"