diff --git a/package.json b/package.json
index 0ffbdbd..c4e44c3 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
   "types": "types/index.d.ts",
   "devDependencies": {
     "@types/node": "^25.0.3",
-    "c8": "^10.1.3",
+    "c8": "^11.0.0",
     "eslint": "^9.17.0",
     "fastify": "^5.0.0",
     "neostandard": "^0.12.0",