diff --git a/package.json b/package.json
index b078a2d..029020b 100644
--- a/package.json
+++ b/package.json
@@ -70,7 +70,7 @@
     "jest-environment-node": "^30.0.2",
     "jest-util": "^30.0.2",
     "jsonc-eslint-parser": "^2.1.0",
-    "markdownlint-cli2": "^0.19.1",
+    "markdownlint-cli2": "^0.21.0",
     "prettier": "^3.7.4",
     "ts-jest": "^29.4.0",
     "ts-node": "10.9.1",