diff --git a/package.json b/package.json
index c8aac1d..4b19121 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
   },
   "homepage": "https://github.com/Dashride/mongoose-intl-phone-number",
   "devDependencies": {
-    "chai": "^3.2.0",
+    "chai": "^4.1.2",
     "coveralls": "^2.13.1",
     "gulp": "^3.9.0",
     "gulp-concat": "^2.6.0",