diff --git a/addon/package-lock.json b/addon/package-lock.json
index bcaa1e60b..f267e92df 100644
--- a/addon/package-lock.json
+++ b/addon/package-lock.json
@@ -10256,9 +10256,9 @@
       }
     },
     "webpack-cli": {
-      "version": "3.3.8",
-      "resolved": "https://registry.npmjs.org/webpack-cli/-/webpack-cli-3.3.8.tgz",
-      "integrity": "sha512-RANYSXwikSWINjHMd/mtesblNSpjpDLoYTBtP99n1RhXqVI/wxN40Auqy42I7y4xrbmRBoA5Zy5E0JSBD5XRhw==",
+      "version": "3.3.9",
+      "resolved": "https://registry.npmjs.org/webpack-cli/-/webpack-cli-3.3.9.tgz",
+      "integrity": "sha512-xwnSxWl8nZtBl/AFJCOn9pG7s5CYUYdZxmmukv+fAHLcBIHM36dImfpQg3WfShZXeArkWlf6QRw24Klcsv8a5A==",
       "dev": true,
       "requires": {
         "chalk": "2.4.2",
diff --git a/addon/package.json b/addon/package.json
index 70a4d8c97..a7d3dd362 100644
--- a/addon/package.json
+++ b/addon/package.json
@@ -13,7 +13,7 @@
     "eslint-plugin-no-unsanitized": "^3.0.2",
     "web-ext": "^3.1.1",
     "webpack": "^4.40.2",
-    "webpack-cli": "^3.3.8"
+    "webpack-cli": "^3.3.9"
   },
   "scripts": {
     "lint": "eslint src/*.js",