diff --git a/.changeset/eight-hornets-approve.md b/.changeset/eight-hornets-approve.md
new file mode 100644
index 00000000..2daf954d
--- /dev/null
+++ b/.changeset/eight-hornets-approve.md
@@ -0,0 +1,5 @@
+---
+"eslint-plugin-prettier": minor
+---
+
+refactor: migrate `worker.js` to `worker.mjs`
diff --git a/eslint-plugin-prettier.js b/eslint-plugin-prettier.js
index c6d223c6..4b5c8c9a 100644
--- a/eslint-plugin-prettier.js
+++ b/eslint-plugin-prettier.js
@@ -172,7 +172,7 @@ const eslintPluginPrettier = {
             if (!prettierFormat) {
               // Prettier is expensive to load, so only load it if needed.
               prettierFormat = /** @type {PrettierFormat} */ (
-                require('synckit').createSyncFn(require.resolve('./worker'))
+                require('synckit').createSyncFn(require.resolve('./worker.mjs'))
               );
             }
 
diff --git a/package.json b/package.json
index fc64f384..c3b5249d 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "eslint-plugin-prettier.js",
     "recommended.d.ts",
     "recommended.js",
-    "worker.js"
+    "worker.mjs"
   ],
   "keywords": [
     "eslint",
diff --git a/worker.js b/worker.mjs
similarity index 96%
rename from worker.js
rename to worker.mjs
index e18d03bc..b76274ce 100644
--- a/worker.js
+++ b/worker.mjs
@@ -11,13 +11,8 @@
  * @import {ESLint} from 'eslint'
  */
 
-const { runAsWorker } = require('synckit');
-
-/**
- * @type {typeof Prettier}
- * @import * as Prettier from 'prettier'
- */
-let prettier;
+import prettier from 'prettier';
+import { runAsWorker } from 'synckit';
 
 runAsWorker(
   /**
@@ -38,10 +33,6 @@ runAsWorker(
     },
     eslintFileInfoOptions,
   ) => {
-    if (!prettier) {
-      prettier = await import('prettier');
-    }
-
     const prettierRcOptions = usePrettierrc
       ? await prettier.resolveConfig(onDiskFilepath, {
           editorconfig: true,