diff --git a/package-lock.json b/package-lock.json
index 1473d89..923484c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -287,9 +287,9 @@
       "dev": true
     },
     "@types/chai": {
-      "version": "4.2.3",
-      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.2.3.tgz",
-      "integrity": "sha512-VRw2xEGbll3ZiTQ4J02/hUjNqZoue1bMhoo2dgM2LXjDdyaq4q80HgBDHwpI0/VKlo4Eg+BavyQMv/NYgTetzA==",
+      "version": "4.2.9",
+      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.2.9.tgz",
+      "integrity": "sha512-NeXgZj+MFL4izGqA4sapdYzkzQG+MtGra9vhQ58dnmDY++VgJaRUws+aLVV5zRJCYJl/8s9IjMmhiUw1WsKSmw==",
       "dev": true
     },
     "@types/debug": {
diff --git a/package.json b/package.json
index 735dd10..4b1607b 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
   "license": "ISC",
   "devDependencies": {
     "@types/bluebird": "3.5.27",
-    "@types/chai": "4.2.3",
+    "@types/chai": "4.2.9",
     "@types/debug": "4.1.5",
     "@types/linkify-it": "2.1.0",
     "@types/lodash": "4.14.141",