diff --git a/package.json b/package.json
index ac82afc..9eb0da5 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
   "homepage": "https://github.com/crawlkit/runner-accessibility-developer-tools#readme",
   "devDependencies": {
     "almond": "^0.3.2",
-    "chai": "^3.5.0",
+    "chai": "^4.0.1",
     "chai-as-promised": "^5.3.0",
     "crawlkit": "^2.0.1",
     "cz-conventional-changelog": "^2.0.0",