diff --git a/package.json b/package.json
index e3a1355..c9afcf9 100644
--- a/package.json
+++ b/package.json
@@ -59,7 +59,7 @@
     "@fastify/type-provider-typebox": "^6.1.0",
     "@types/node": "^26.0.1",
     "@types/ws": "^8.5.10",
-    "c8": "^11.0.0",
+    "c8": "^12.0.0",
     "eslint": "^9.39.2",
     "fastify": "^5.0.0",
     "fastify-tsconfig": "^3.0.0",