diff --git a/package.json b/package.json
index 55b8b6e..ffc7a28 100644
--- a/package.json
+++ b/package.json
@@ -163,7 +163,7 @@
   ],
   "main": "./index",
   "dependencies": {
-    "chai": ">=1.9.2 <4.0.0",
+    "chai": ">=4.0.2",
     "debug": "^2.6.8",
     "deep-equal": "^1.0.0",
     "json-stringify-safe": "^5.0.1",