diff --git a/package.json b/package.json
index dca4705..c2b4b1f 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
     "ret": "~0.5.0"
   },
   "devDependencies": {
-    "c8": "^10.1.3",
+    "c8": "^11.0.0",
     "eslint": "^9.17.0",
     "neostandard": "^0.12.0",
     "tsd": "^0.33.0"