diff --git a/package.json b/package.json
index cb785cb..db684f1 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
   "devDependencies": {
     "@types/node": "^18.11.8",
     "@types/sprintf-js": "^1.1.2",
-    "c8": "^8.0.0",
+    "c8": "^9.0.0",
     "chai": "^4.3.6",
     "eslint": "^8.49.0",
     "eslint-config-hexo": "^5.0.0",