diff --git a/package.json b/package.json
index da2e47e..c99d53e 100644
--- a/package.json
+++ b/package.json
@@ -68,7 +68,7 @@
     "tslint": "^5.12.1",
     "tslint-config-prettier": "^1.16.0",
     "tslint-plugin-prettier": "^2.0.1",
-    "typescript": "^3.1.6"
+    "typescript": "^4.3.5"
   },
   "nyc": {
     "extension": [
diff --git a/yarn.lock b/yarn.lock
index 843fb4f..0dd3cda 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2477,10 +2477,10 @@ type-is@~1.6.16:
     media-typer "0.3.0"
     mime-types "~2.1.18"
 
-typescript@^3.1.6:
-  version "3.1.6"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.1.6.tgz#b6543a83cfc8c2befb3f4c8fba6896f5b0c9be68"
-  integrity sha512-tDMYfVtvpb96msS1lDX9MEdHrW4yOuZ4Kdc4Him9oU796XldPYF/t2+uKoX0BBa0hXXwDlqYQbXY5Rzjzc5hBA==
+typescript@^4.3.5:
+  version "4.3.5"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.3.5.tgz#4d1c37cc16e893973c45a06886b7113234f119f4"
+  integrity sha512-DqQgihaQ9cUrskJo9kIyW/+g0Vxsk8cDtZ52a3NGh0YNTfpUSArXSohyUGnvbPazEPLu398C0UxmKSOrPumUzA==
 
 uglify-js@^2.6:
   version "2.8.29"