diff --git a/package.json b/package.json
index f83f8e8..07ec387 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,7 @@
   "author": "Tommy Chen <tommy351@gmail.com> (https://zespia.tw)",
   "license": "MIT",
   "devDependencies": {
-    "c8": "^8.0.0",
+    "c8": "^9.0.0",
     "chai": "^4.3.6",
     "eslint": "^8.25.0",
     "eslint-config-hexo": "^5.0.0",