diff --git a/package.json b/package.json
index 4f8aa91..792465c 100644
--- a/package.json
+++ b/package.json
@@ -63,7 +63,7 @@
   "devDependencies": {
     "@sinonjs/fake-timers": "^15.0.0",
     "@types/node": "^26.0.1",
-    "c8": "^11.0.0",
+    "c8": "^12.0.0",
     "cookie": "^2.0.0",
     "eslint": "^9.17.0",
     "fastify": "^5.0.0",