diff --git a/src/index.ts b/src/index.ts
index d0de1e9..46e6100 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1 +1 @@
-export { randomString } from './utils/randomString';
\ No newline at end of file
+export { randomString } from './utils/randomString.js';
\ No newline at end of file
diff --git a/tests/randomString.test.ts b/tests/randomString.test.ts
index dec4b44..f316d9a 100644
--- a/tests/randomString.test.ts
+++ b/tests/randomString.test.ts
@@ -1,4 +1,4 @@
-import { randomString } from '../src/index'
+import { randomString } from '../src/index.js'
 
 describe('randomString', () => {
     it('should return a random string with the length of 10', () => {