diff --git a/package.json b/package.json
index 9ee7fb0..53c5a32 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
     "https-proxy-agent": "^1.0.0"
   },
   "devDependencies": {
-    "chai": "^2.1.1",
+    "chai": "^3.5.0",
     "gulp": "^3.9.0",
     "gulp-mocha": "^2.1.3",
     "mocha": "^2.2.1",