diff --git a/package.json b/package.json
index 8a4ca67..6423629 100644
--- a/package.json
+++ b/package.json
@@ -67,7 +67,7 @@
   "devDependencies": {
     "typebox": "^1.0.81",
     "ajv-formats": "^3.0.1",
-    "c8": "^11.0.0",
+    "c8": "^12.0.0",
     "eslint": "^9.17.0",
     "fluent-json-schema": "^6.0.0",
     "neostandard": "^0.13.0",