diff --git a/package.json b/package.json
index 980e6c5..35542e4 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
   "homepage": "https://github.com/crawlkit/runner-htmlcs#readme",
   "devDependencies": {
     "almond": "^0.3.2",
-    "chai": "^3.5.0",
+    "chai": "^4.0.0",
     "chai-as-promised": "^5.3.0",
     "crawlkit": "^2.0.1",
     "cz-conventional-changelog": "^2.0.0",