diff --git a/package.json b/package.json
index 9d8b0c0..93c045e 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
     "lodash": "^4.14.2"
   },
   "devDependencies": {
-    "chai": "^3.5.0",
+    "chai": "^4.1.1",
     "dirty-chai": "^1.2.2",
     "eslint": "^3.2.2",
     "inquirer": "^3.0.1",