diff --git a/package.json b/package.json
index 8cb0adf..f2024cc 100644
--- a/package.json
+++ b/package.json
@@ -2,6 +2,7 @@
   "name": "blog-v4",
   "version": "0.1.0",
   "private": true,
+  "type": "module",
   "scripts": {
     "dev": "next dev",
     "build": "next build && node scripts/build-search.mjs",
diff --git a/postcss.config.js b/postcss.config.js
deleted file mode 100644
index 12a703d..0000000
--- a/postcss.config.js
+++ /dev/null
@@ -1,6 +0,0 @@
-module.exports = {
-  plugins: {
-    tailwindcss: {},
-    autoprefixer: {},
-  },
-};
diff --git a/postcss.config.mjs b/postcss.config.mjs
new file mode 100644
index 0000000..c935b0c
--- /dev/null
+++ b/postcss.config.mjs
@@ -0,0 +1,8 @@
+/** @type {import('postcss-load-config').Config} */
+const config = {
+  plugins: {
+    tailwindcss: {},
+    autoprefixer: {},
+  },
+};
+export default config;