diff --git a/package-lock.json b/package-lock.json
index e84b74b..53aa3da 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11620,9 +11620,9 @@
       }
     },
     "typescript": {
-      "version": "3.8.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.8.3.tgz",
-      "integrity": "sha512-MYlEfn5VrLNsgudQTVJeNaQFUAI7DkhnOjdpAp4T+ku1TfQClewlbSuTVHiA+8skNBgaf02TL/kLOvig4y3G8w==",
+      "version": "4.3.5",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.3.5.tgz",
+      "integrity": "sha512-DqQgihaQ9cUrskJo9kIyW/+g0Vxsk8cDtZ52a3NGh0YNTfpUSArXSohyUGnvbPazEPLu398C0UxmKSOrPumUzA==",
       "dev": true
     },
     "uint64be": {
diff --git a/package.json b/package.json
index 5c53780..ff9eb52 100644
--- a/package.json
+++ b/package.json
@@ -49,7 +49,7 @@
     "cross-env": "^7.0.2",
     "patch-package": "^6.2.2",
     "tsify": "^4.0.1",
-    "typescript": "^3.8.3",
+    "typescript": "^4.3.5",
     "web-ext": "^4.2.0",
     "web-ext-types": "^3.2.1"
   }