diff --git a/package.json b/package.json
index 9e46949..1256105 100644
--- a/package.json
+++ b/package.json
@@ -38,7 +38,7 @@
     "gulp-clean": "~0.4.0",
     "gulp-mocha": "~0.4.1",
     "mocha": "~1.17.1",
-    "chai": "~1.10.0",
+    "chai": "~4.3.6",
     "sinon": "~1.9.0",
     "sinon-chai": "~2.5.0"
   },