diff --git a/test/fixtures/package.json b/test/fixtures/package.json
index 01265e5f..db1a9726 100644
--- a/test/fixtures/package.json
+++ b/test/fixtures/package.json
@@ -28,7 +28,7 @@
     "chalk": "^0.5.1",
     "cwd": "^0.4.0",
     "debug": "^2.1.1",
-    "diff": "^1.2.2"
+    "diff": "^4.0.4"
   },
   "devDependencies": {
     "lodash": "^3.3.0",