diff --git a/package.json b/package.json
index 1a19e96..f0a3b59 100644
--- a/package.json
+++ b/package.json
@@ -54,7 +54,7 @@
     },
     "devDependencies": {
         "@eslint-community/eslint-plugin-mysticatea": "^15.5.1",
-        "c8": "^8.0.1",
+        "c8": "^10.1.1",
         "dot-prop": "^7.2.0",
         "eslint": "^8.50.0",
         "installed-check": "^8.0.1",