diff --git a/package-lock.json b/package-lock.json
index cadd0ad..818cf53 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -123,9 +123,9 @@
       }
     },
     "@types/chai": {
-      "version": "4.2.14",
-      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.2.14.tgz",
-      "integrity": "sha512-G+ITQPXkwTrslfG5L/BksmbLUA0M1iybEsmCWPqzSxsRRhJZimBKJkoMi8fr/CPygPTj4zO5pJH7I2/cm9M7SQ==",
+      "version": "4.2.21",
+      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.2.21.tgz",
+      "integrity": "sha512-yd+9qKmJxm496BOV9CMNaey8TWsikaZOwMRwPHQIjcOJM9oV+fi9ZMNw3JsVnbEEbo2gRTDnGEBv8pjyn67hNg==",
       "dev": true
     },
     "@types/chai-as-promised": {
diff --git a/package.json b/package.json
index dd7744b..806c28a 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
     "reflect-metadata": "^0.1.13"
   },
   "devDependencies": {
-    "@types/chai": "^4.2.14",
+    "@types/chai": "^4.2.21",
     "@types/chai-as-promised": "^7.1.3",
     "@types/express": "^4.17.11",
     "@types/koa": "^2.11.6",