diff --git a/package.json b/package.json
index d4c6c6a..7419604 100644
--- a/package.json
+++ b/package.json
@@ -60,7 +60,7 @@
   "devDependencies": {
     "@types/node": "^26.0.1",
     "benchmark": "^2.1.4",
-    "c8": "^11.0.0",
+    "c8": "^12.0.0",
     "eslint": "^9.17.0",
     "fastify": "^5.0.0",
     "neostandard": "^0.13.0",