diff --git a/lib/package.json b/lib/package.json
index 71f18ba..4ae435b 100644
--- a/lib/package.json
+++ b/lib/package.json
@@ -32,8 +32,10 @@
     "node": ">=16.9.0"
   },
   "sideEffects": false,
+  "type": "module",
+  "main": "dist/index.cjs",
+  "types": "dist/index.d.ts",
   "module": "dist/index.mjs",
-  "types": "dist/index.d.mts",
   "exports": {
     "./package.json": "./package.json",
     ".": {
diff --git a/lib/tsup.config.ts b/lib/tsup.config.ts
index 9138520..70ba7a4 100644
--- a/lib/tsup.config.ts
+++ b/lib/tsup.config.ts
@@ -10,7 +10,13 @@ export default defineConfig((options) => ({
   clean: !options.watch,
   dts: true,
   entry: ['src/index.ts'],
-  format: ['esm'],
+  format: ['esm', 'cjs'],
+  outExtension: (context) => {
+    return {
+      dts: context.format === 'esm' ? '.d.mts' : '.d.ts',
+      js: context.format === 'esm' ? '.mjs' : '.cjs',
+    };
+  },
   minify: !options.watch,
   target,
   sourcemap: true,