diff --git a/yarn.lock b/yarn.lock
index 4edaf7e7..957932aa 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -558,9 +558,9 @@
     "@babel/types" "^7.3.0"
 
 "@types/chai@*", "@types/chai@^4.2.6":
-  version "4.2.11"
-  resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.2.11.tgz#d3614d6c5f500142358e6ed24e1bf16657536c50"
-  integrity sha512-t7uW6eFafjO+qJ3BIV2gGUyZs27egcNRkUdalkud+Qa3+kg//f129iuOFivHDXQ+vnU3fDXuwgv0cqMCbcE8sw==
+  version "4.2.20"
+  resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.2.20.tgz#bb02e7d02b6c452f6bbb8fe575b56e180644de67"
+  integrity sha512-E121rHk/4BlcEwANZOwcHl8L/Sl0zyIFXJoyggXkl7FCT/4MTf5u25f+qiphe0V5ELaFIkCptgvbf4whCJUVMA==
 
 "@types/color-name@^1.1.1":
   version "1.1.1"