diff --git a/package.json b/package.json
index 4d92246..eab489f 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "ava": "^3.7.0",
     "eslint-config-steelbrain": "^9.0.1",
     "ts-node": "^8.8.2",
-    "typescript": "^3.8.3"
+    "typescript": "^4.3.5"
   },
   "dependencies": {},
   "ava": {
diff --git a/yarn.lock b/yarn.lock
index 04b724b..097504b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2873,10 +2873,10 @@ typedarray-to-buffer@^3.1.5:
   dependencies:
     is-typedarray "^1.0.0"
 
-typescript@^3.8.3:
-  version "3.9.7"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.7.tgz#98d600a5ebdc38f40cb277522f12dc800e9e25fa"
-  integrity sha512-BLbiRkiBzAwsjut4x/dsibSTB6yWpwT5qWmC2OfuCg3GgVQCSgMs4vEctYPhsaGtd0AeuuHMkjZ2h2WG8MSzRw==
+typescript@^4.3.5:
+  version "4.3.5"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.3.5.tgz#4d1c37cc16e893973c45a06886b7113234f119f4"
+  integrity sha512-DqQgihaQ9cUrskJo9kIyW/+g0Vxsk8cDtZ52a3NGh0YNTfpUSArXSohyUGnvbPazEPLu398C0UxmKSOrPumUzA==
 
 unique-string@^2.0.0:
   version "2.0.0"