diff --git a/package.json b/package.json
index a358802..3d0e727 100644
--- a/package.json
+++ b/package.json
@@ -76,7 +76,7 @@
     "web3-utils": "^1.0.0-beta.55"
   },
   "devDependencies": {
-    "@types/chai": "4.1.7",
+    "@types/chai": "4.2.8",
     "@types/debug": "0.0.31",
     "@types/download": "6.2.3",
     "@types/express": "4.16.0",