diff --git a/package-lock.json b/package-lock.json
index 90d8229..fddd179 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,7 +14,7 @@
         "@slack/web-api": "^7.7.0",
         "axios": "^1.7.7",
         "axios-retry": "^4.5.0",
-        "flat": "^5.0.2",
+        "flat": "^6.0.1",
         "https-proxy-agent": "^7.0.5",
         "js-yaml": "^4.1.0",
         "markup-js": "^1.5.21"
@@ -1329,11 +1329,15 @@
       }
     },
     "node_modules/flat": {
-      "version": "5.0.2",
-      "resolved": "https://registry.npmjs.org/flat/-/flat-5.0.2.tgz",
-      "integrity": "sha512-b6suED+5/3rTpUBdG1gupIl8MPFCAMA0QXwmljLhvCUKcUvdE4gWky9zpuGCcXHOsz4J9wPGNWq6OKpmIzz3hQ==",
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/flat/-/flat-6.0.1.tgz",
+      "integrity": "sha512-/3FfIa8mbrg3xE7+wAhWeV+bd7L2Mof+xtZb5dRDKZ+wDvYJK4WDYeIOuOhre5Yv5aQObZrlbRmk3RTSiuQBtw==",
+      "license": "BSD-3-Clause",
       "bin": {
         "flat": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
       }
     },
     "node_modules/follow-redirects": {
@@ -2497,6 +2501,16 @@
         "node": ">=10"
       }
     },
+    "node_modules/yargs-unparser/node_modules/flat": {
+      "version": "5.0.2",
+      "resolved": "https://registry.npmjs.org/flat/-/flat-5.0.2.tgz",
+      "integrity": "sha512-b6suED+5/3rTpUBdG1gupIl8MPFCAMA0QXwmljLhvCUKcUvdE4gWky9zpuGCcXHOsz4J9wPGNWq6OKpmIzz3hQ==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "bin": {
+        "flat": "cli.js"
+      }
+    },
     "node_modules/yocto-queue": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
diff --git a/package.json b/package.json
index c28eec6..1724682 100644
--- a/package.json
+++ b/package.json
@@ -38,7 +38,7 @@
     "@slack/web-api": "^7.7.0",
     "axios": "^1.7.7",
     "axios-retry": "^4.5.0",
-    "flat": "^5.0.2",
+    "flat": "^6.0.1",
     "https-proxy-agent": "^7.0.5",
     "js-yaml": "^4.1.0",
     "markup-js": "^1.5.21"
diff --git a/src/content.js b/src/content.js
index d040800..6594a32 100644
--- a/src/content.js
+++ b/src/content.js
@@ -1,7 +1,7 @@
 import fs from "node:fs";
 import path from "node:path";
 import github from "@actions/github";
-import flatten from "flat";
+import { flatten } from "flat";
 import yaml from "js-yaml";
 import markup from "markup-js";
 import Config from "./config.js";