diff --git a/package.json b/package.json
index aab7931..e16d725 100644
--- a/package.json
+++ b/package.json
@@ -49,7 +49,7 @@
     "@types/superagent": "^2.0.34",
     "@types/supertest": "^2.0.0",
     "@types/winston": "2.3.4",
-    "chai": "^3.5.0",
+    "chai": "^4.1.1",
     "codeclimate-test-reporter": "^0.4.0",
     "core-js": "^2.4.1",
     "istanbul": "^0.4.3",