diff --git a/package.json b/package.json
index c2e26bb..1904126 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
   "devDependencies": {
     "@types/encoding-japanese": "^1.0.15",
     "@types/mocha": "^5.0.0",
-    "@types/node": "^9.3.0",
+    "@types/node": "^14.0.5",
     "@types/power-assert": "^1.4.29",
     "cross-env": "^5.1.3",
     "mocha": "^5.0.0",