diff --git a/package.json b/package.json
index bdc10da..18440ad 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
     "chalk": "2.4.2"
   },
   "devDependencies": {
-    "@types/chai": "4.2.0",
+    "@types/chai": "4.2.4",
     "@types/chalk": "2.2.0",
     "@types/mocha": "5.2.7",
     "@types/sinon": "7.0.13",