diff --git a/package.json b/package.json
index 2ff8c09..8ed7a38 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
     "babel-preset-es2015": "^6.18.0",
     "babelify": "^7.3.0",
     "broccoli-asset-rev": "^2.4.5",
-    "chai": "^3.5.0",
+    "chai": "^4.0.2",
     "ember-ajax": "^2.4.1",
     "ember-browserify": "1.1.13",
     "ember-cli": "2.10.0",