diff --git a/package.json b/package.json
index 6bcf36d..c2a832c 100644
--- a/package.json
+++ b/package.json
@@ -61,7 +61,7 @@
   "devDependencies": {
     "@fastify/auth": "^5.0.0",
     "@types/node": "^25.0.3",
-    "c8": "^10.1.2",
+    "c8": "^11.0.0",
     "eslint": "^9.17.0",
     "fastify": "^5.0.0",
     "neostandard": "^0.12.0",