diff --git a/package.json b/package.json
index 5b64e50..7b1e5c6 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
     "@microsoft/api-documenter": "7.7.12",
     "@microsoft/api-extractor": "7.7.8",
     "@types/bunyan": "1.8.6",
-    "@types/chai": "4.2.8",
+    "@types/chai": "4.2.9",
     "@types/chai-as-promised": "7.1.2",
     "@types/deep-diff": "1.0.0",
     "@types/js-yaml": "3.12.2",
diff --git a/yarn.lock b/yarn.lock
index 29e0ea4..053970e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -272,10 +272,10 @@
   resolved "https://artifacts.apextoaster.com/repository/group-npm/@types/chai/-/chai-4.2.4.tgz#8936cffad3c96ec470a2dc26a38c3ba8b9b6f619"
   integrity sha512-7qvf9F9tMTzo0akeswHPGqgUx/gIaJqrOEET/FCD8CFRkSUHlygQiM5yB6OvjrtdxBVLSyw7COJubsFYs0683g==
 
-"@types/chai@4.2.8":
-  version "4.2.8"
-  resolved "https://artifacts.apextoaster.com/repository/group-npm/@types/chai/-/chai-4.2.8.tgz#c8d645506db0d15f4aafd4dfa873f443ad87ea59"
-  integrity sha512-U1bQiWbln41Yo6EeHMr+34aUhvrMVyrhn9lYfPSpLTCrZlGxU4Rtn1bocX+0p2Fc/Jkd2FanCEXdw0WNfHHM0w==
+"@types/chai@4.2.9":
+  version "4.2.9"
+  resolved "https://artifacts.apextoaster.com/repository/group-npm/@types/chai/-/chai-4.2.9.tgz#194332625ed2ae914aef00b8d5ca3b77e7924cc6"
+  integrity sha512-NeXgZj+MFL4izGqA4sapdYzkzQG+MtGra9vhQ58dnmDY++VgJaRUws+aLVV5zRJCYJl/8s9IjMmhiUw1WsKSmw==
 
 "@types/color-name@^1.1.1":
   version "1.1.1"