diff --git a/package.json b/package.json
index 9def6f7..f925995 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
   "devDependencies": {
     "coffee-script": "~1.10.0",
     "defs": "~1.1.1",
-    "diff": "~2.2.1",
+    "diff": "~4.0.1",
     "find-line-column": "~0.5.2"
   },
   "keywords": [