diff --git a/package.json b/package.json
index 8a8e399..e5664cd 100644
--- a/package.json
+++ b/package.json
@@ -59,7 +59,7 @@
     "@types/node": "^26.0.0",
     "after": "0.8.2",
     "benchmark": "^2.1.4",
-    "c8": "^11.0.0",
+    "c8": "^12.0.0",
     "eslint": "^9.17.0",
     "neostandard": "^0.12.0",
     "supertest": "7.0.0",