diff --git a/package.json b/package.json
index 51eee57..7464237 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
     "precommit": "npm test"
   },
   "devDependencies": {
-    "chai": "^3.5.0",
+    "chai": "^4.3.4",
     "eslint": "^7.1.0",
     "husky": "^0.13.1",
     "sinon": "^9.0.2"