diff --git a/package.json b/package.json
index e0480d4..4590850 100644
--- a/package.json
+++ b/package.json
@@ -29,6 +29,6 @@
     "prepare": "npm run build"
   },
   "devDependencies": {
-    "typescript": "^3.9"
+    "typescript": "^4.0"
   }
 }