diff --git a/package.json b/package.json
index 33dfdca..254d409 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
     "@types/serialport": "^8.0.1",
     "eslint": "^7.6.0",
     "eslint-config-awzzm-ts": "^1.0.1",
-    "typescript": "^3.9.7"
+    "typescript": "^4.0.2"
   },
   "dependencies": {
     "serialport": "^9.0.0"
diff --git a/yarn.lock b/yarn.lock
index aef5a5c..7ed8e15 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4476,10 +4476,10 @@ type-fest@^0.8.1:
   resolved "https://registry.yarnpkg.com/type-fest/-/type-fest-0.8.1.tgz#09e249ebde851d3b1e48d27c105444667f17b83d"
   integrity sha512-4dbzIzqvjtgiM5rw1k5rEHtBANKmdudhGyBEajN01fEyhaAIhsoKNy6y7+IN93IfpFtwY9iqi7kD+xwKhQsNJA==
 
-typescript@^3.9.7:
-  version "3.9.7"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.7.tgz#98d600a5ebdc38f40cb277522f12dc800e9e25fa"
-  integrity sha512-BLbiRkiBzAwsjut4x/dsibSTB6yWpwT5qWmC2OfuCg3GgVQCSgMs4vEctYPhsaGtd0AeuuHMkjZ2h2WG8MSzRw==
+typescript@^4.0.2:
+  version "4.0.2"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.0.2.tgz#7ea7c88777c723c681e33bf7988be5d008d05ac2"
+  integrity sha512-e4ERvRV2wb+rRZ/IQeb3jm2VxBsirQLpQhdxplZ2MEzGvDkkMmPglecnNDfSUBivMjP93vRbngYYDQqQ/78bcQ==
 
 unicode-canonical-property-names-ecmascript@^1.0.4:
   version "1.0.4"