diff --git a/package.json b/package.json
index f116fe3..669093d 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
     },
     "devDependencies": {
         "less": ">=2.0.0",
-	"diff": "^1.0"
+	"diff": "^4.0"
     },
     "keywords": [
         "less plugins",