diff --git a/html/Tool/less(css)/less.js-master/package.json b/html/Tool/less(css)/less.js-master/package.json
index b154a6b..d2cc5fc 100644
--- a/html/Tool/less(css)/less.js-master/package.json
+++ b/html/Tool/less(css)/less.js-master/package.json
@@ -46,7 +46,7 @@
     "source-map": "^0.4.2"
   },
   "devDependencies": {
-    "diff": "^1.0",
+    "diff": "^4.0",
     "grunt": "^0.4.5",
     "grunt-contrib-clean": "^0.6.0",
     "grunt-contrib-concat": "^0.5.0",