diff --git a/package.json b/package.json
index d0d610c..2e2ef36 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
     "babel-preset-react": "^6.23.0",
     "babel-preset-stage-0": "^6.22.0",
     "babel-require": "^1.0.1",
-    "chai": "^3.5.0",
+    "chai": "^4.1.0",
     "chai-spies": "^0.7.1",
     "enzyme": "^2.8.0",
     "eslint": "^3.5.0",