diff --git a/package.json b/package.json
index 0098b44..683339c 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
   },
   "homepage": "https://github.com/humanwhocodes/object-schema#readme",
   "devDependencies": {
-    "chai": "^4.2.0",
+    "chai": "^4.4.1",
     "eslint": "^5.13.0",
     "mocha": "^5.2.0"
   }