diff --git a/package-lock.json b/package-lock.json
index c495f86..530e4fa 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -74,9 +74,9 @@
       }
     },
     "@types/chai": {
-      "version": "4.1.7",
-      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.1.7.tgz",
-      "integrity": "sha512-2Y8uPt0/jwjhQ6EiluT0XCri1Dbplr0ZxfFXUz+ye13gaqE8u5gL5ppao1JrUYr9cIip5S6MvQzBS7Kke7U9VA==",
+      "version": "4.2.20",
+      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.2.20.tgz",
+      "integrity": "sha512-E121rHk/4BlcEwANZOwcHl8L/Sl0zyIFXJoyggXkl7FCT/4MTf5u25f+qiphe0V5ELaFIkCptgvbf4whCJUVMA==",
       "dev": true
     },
     "@types/connect": {
diff --git a/package.json b/package.json
index d41f425..02de712 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
   "author": "98Labs, Inc.",
   "license": "MIT",
   "devDependencies": {
-    "@types/chai": "^4.1.7",
+    "@types/chai": "^4.2.20",
     "@types/dotenv": "^4.0.3",
     "@types/koa": "2.0.48",
     "@types/koa-bodyparser": "^4.2.0",