diff --git a/package.json b/package.json
index 8295229..f989a39 100644
--- a/package.json
+++ b/package.json
@@ -65,7 +65,7 @@
   },
   "devDependencies": {
     "@types/app-root-path": "1.2.4",
-    "@types/chai": "4.0.7",
+    "@types/chai": "4.0.8",
     "@types/mocha": "2.2.44",
     "@types/node": "^8.0.0",
     "chai": "4.1.2",