diff --git a/package.json b/package.json
index f49dba89..46791cc6 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
     "@mike-north/js-lib-semantic-release-config": "1.0.1",
     "@types/aws-lambda": "8.10.65",
     "@types/aws-sdk": "2.7.0",
-    "@types/chai": "4.1.7",
+    "@types/chai": "4.3.5",
     "@types/mocha": "5.2.7",
     "@types/node": "9.6.61",
     "chai": "4.3.1",
diff --git a/yarn.lock b/yarn.lock
index d7b40e3a..02814990 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1654,10 +1654,10 @@
   dependencies:
     aws-sdk "*"
 
-"@types/chai@4.1.7":
-  version "4.1.7"
-  resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.1.7.tgz#1b8e33b61a8c09cbe1f85133071baa0dbf9fa71a"
-  integrity sha512-2Y8uPt0/jwjhQ6EiluT0XCri1Dbplr0ZxfFXUz+ye13gaqE8u5gL5ppao1JrUYr9cIip5S6MvQzBS7Kke7U9VA==
+"@types/chai@4.3.5":
+  version "4.3.5"
+  resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.3.5.tgz#ae69bcbb1bebb68c4ac0b11e9d8ed04526b3562b"
+  integrity sha512-mEo1sAde+UCE6b2hxn332f1g1E8WfYRu6p5SvTKr2ZKC1f7gFJXk4h5PyGP9Dt6gCaG8y8XhwnXWC6Iy2cmBng==
 
 "@types/glob@^7.1.1":
   version "7.2.0"