diff --git a/package.json b/package.json
index adc6392..46bc97f 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
     "karma-coverage": "^0.2.1",
     "karma-phantomjs-launcher": "0.1.2",
     "karma-qunit": "^0.1.1",
-    "merge2": "^0.3.6",
+    "merge2": "^1.4.1",
     "typescript": "~1.5.0",
     "phantomjs": "^1.9.7-3",
     "qunitjs": "~1.14.0",