diff --git a/package-lock.json b/package-lock.json
index 15fd9a9..5df214a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11131,6 +11131,12 @@
         }
       }
     },
+    "web-ext-types": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/web-ext-types/-/web-ext-types-3.1.0.tgz",
+      "integrity": "sha512-HKVibk040vuhpbOljcIYYYC8GP9w9REbHpquI3im/aoZqoDIRq9DnsHl4Zsg+4Fg3SBnWsnvlIr1rnspV4TdXQ==",
+      "dev": true
+    },
     "webextensions-api-fake": {
       "version": "0.7.4",
       "resolved": "https://registry.npmjs.org/webextensions-api-fake/-/webextensions-api-fake-0.7.4.tgz",
diff --git a/package.json b/package.json
index 9db3296..09354f2 100644
--- a/package.json
+++ b/package.json
@@ -53,6 +53,7 @@
     "sinon-chrome": "^3.0.1",
     "style-loader": "^0.23.1",
     "typescript": "^3.4.5",
+    "web-ext-types": "^3.1.0",
     "webextensions-api-fake": "^0.7.4",
     "webpack": "^4.30.0",
     "webpack-cli": "^3.3.1"