diff --git a/package.json b/package.json
index 1777448c3..4c2778c41 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
     "bem-walk": "1.0.0-alpha1",
     "borschik": "^1.5.3",
     "bower": "^1.7.9",
-    "chai": "^3.2.0",
+    "chai": "^4.0.1",
     "chai-as-promised": "^5.1.0",
     "enb": "^1.2.0",
     "enb-bem-docs": "0.11.0",