diff --git a/package.json b/package.json
index c2e26bb..76a7a32 100644
--- a/package.json
+++ b/package.json
@@ -45,7 +45,7 @@
     "power-assert": "^1.4.4",
     "shx": "^0.2.2",
     "tslint": "^5.9.1",
-    "typescript": "^2.7.2"
+    "typescript": "^3.8.2"
   },
   "url": "https://github.com/Ikagaka/ghost-kernel.js",
   "author": {