diff --git a/package.json b/package.json
index 49fb240a..cab79055 100644
--- a/package.json
+++ b/package.json
@@ -48,7 +48,7 @@
     "@types/node": "^18.19.31",
     "@types/sinon": "^17.0.3",
     "chai": "^4.4.1",
-    "eslint": "^8.57.0",
+    "eslint": "^9.1.1",
     "eslint-config-teppeis": "^19.1.2",
     "mocha": "^10.4.0",
     "npm-run-all": "^4.1.5",