diff --git a/package.json b/package.json
index b124983..a510abb 100644
--- a/package.json
+++ b/package.json
@@ -29,6 +29,6 @@
     "coveralls": "^3.0.7",
     "mocha": "^7.0.1",
     "nyc": "15.1.0",
-    "typescript": "^3.5.3"
+    "typescript": "^4.3.5"
   }
 }