diff --git a/yarn.lock b/yarn.lock
index 9337a48..92c1a02 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3,9 +3,9 @@
 
 
 "@types/chai@^4.1.7":
-  version "4.2.8"
-  resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.2.8.tgz#c8d645506db0d15f4aafd4dfa873f443ad87ea59"
-  integrity sha512-U1bQiWbln41Yo6EeHMr+34aUhvrMVyrhn9lYfPSpLTCrZlGxU4Rtn1bocX+0p2Fc/Jkd2FanCEXdw0WNfHHM0w==
+  version "4.2.9"
+  resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.2.9.tgz#194332625ed2ae914aef00b8d5ca3b77e7924cc6"
+  integrity sha512-NeXgZj+MFL4izGqA4sapdYzkzQG+MtGra9vhQ58dnmDY++VgJaRUws+aLVV5zRJCYJl/8s9IjMmhiUw1WsKSmw==
 
 "@types/events@*":
   version "3.0.0"