diff --git a/package.json b/package.json
index 95076da..e993b51 100644
--- a/package.json
+++ b/package.json
@@ -90,7 +90,7 @@
     "lint-staged": "^16.0.0",
     "mdast-util-from-markdown": "^2.0.2",
     "mocha": "^12.0.0",
-    "prettier": "3.9.8",
+    "prettier": "3.9.9",
     "typescript": "^7.0.2",
     "yorkie": "^2.0.0"
   },