diff --git a/package.json b/package.json
index f7a8e91..4464221 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
   "devDependencies": {
     "@commitlint/cli": "12.1.1",
     "@commitlint/config-conventional": "12.1.1",
-    "@types/chai": "4.2.18",
+    "@types/chai": "4.2.21",
     "@types/mocha": "8.2.2",
     "@typescript-eslint/eslint-plugin": "4.23.0",
     "@typescript-eslint/parser": "4.23.0",
diff --git a/yarn.lock b/yarn.lock
index a1bdc18..da6bbec 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1150,10 +1150,10 @@
     "@types/connect" "*"
     "@types/node" "*"
 
-"@types/chai@4.2.18":
-  version "4.2.18"
-  resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.2.18.tgz#0c8e298dbff8205e2266606c1ea5fbdba29b46e4"
-  integrity sha512-rS27+EkB/RE1Iz3u0XtVL5q36MGDWbgYe7zWiodyKNUnthxY0rukK5V36eiUCtCisB7NN8zKYH6DO2M37qxFEQ==
+"@types/chai@4.2.21":
+  version "4.2.21"
+  resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.2.21.tgz#9f35a5643129df132cf3b5c1ec64046ea1af0650"
+  integrity sha512-yd+9qKmJxm496BOV9CMNaey8TWsikaZOwMRwPHQIjcOJM9oV+fi9ZMNw3JsVnbEEbo2gRTDnGEBv8pjyn67hNg==
 
 "@types/connect-history-api-fallback@*":
   version "1.3.4"