diff --git a/packages/app/src/__tests__/app.test.ts b/packages/app/src/__tests__/app.test.ts
index ac88200..a29139b 100644
--- a/packages/app/src/__tests__/app.test.ts
+++ b/packages/app/src/__tests__/app.test.ts
@@ -3,6 +3,9 @@ import supertest from 'supertest';
 import { describe, expect, it } from 'vitest';
 
 import { createApp, AppServer } from '../index';
+const from = 15000;
+const range = 100;
+const port = from + ~~(Math.random() * range);
 
 describe('app', async () => {
   const rpc: AppServer = createApp({
@@ -88,7 +91,7 @@ describe('app', async () => {
   const request = supertest(rpc.callback());
 
   it('should start === rpc.callback', async () => {
-    const request2 = supertest(rpc.start(30001));
+    const request2 = supertest(rpc.start(port));
     const res = await request2.get('/api/a?$p=["hello"]');
     expect(res.type).toEqual('application/json');
     expect(res.status).toEqual(200);
diff --git a/packages/client/src/__tests__/index.test.ts b/packages/client/src/__tests__/index.test.ts
index 7fcd8a6..3df4a41 100644
--- a/packages/client/src/__tests__/index.test.ts
+++ b/packages/client/src/__tests__/index.test.ts
@@ -4,6 +4,10 @@ import { describe, expect, it } from 'vitest';
 
 import { createClient } from '..';
 
+const from = 15000;
+const range = 100;
+const port = from + ~~(Math.random() * range);
+
 describe('lib', () => {
   const rpc = createServer({
     fn: {
@@ -42,11 +46,11 @@ describe('lib', () => {
   });
 
   it('should GET return json', async () => {
-    rpc.start(30001);
+    rpc.start(port);
 
     const client = createClient({
       host: '127.0.0.1',
-      port: 30001,
+      port: port,
     });
 
     // console.dir(client);
@@ -55,7 +59,7 @@ describe('lib', () => {
 
     expect(res1['a']).toBe('hello');
 
-    const res = await fetch('http://127.0.0.1:30001/api/a?$p=["hello"]');
+    const res = await fetch(`http://127.0.0.1:${port}/api/a?$p=["hello"]`);
     const s = await res.json();
     // console.dir(s);
     expect(s['a']).toBe('hello');
diff --git a/packages/core/src/__tests__/app.test.ts b/packages/core/src/__tests__/app.test.ts
index 0e378e2..d65579c 100644
--- a/packages/core/src/__tests__/app.test.ts
+++ b/packages/core/src/__tests__/app.test.ts
@@ -3,6 +3,10 @@ import { describe, expect, it } from 'vitest';
 
 import { createServer } from '../index';
 
+const from = 15000;
+const range = 100;
+const port = from + ~~(Math.random() * range);
+
 describe('app', async () => {
   const rpc = createServer({
     fn: {
@@ -40,7 +44,7 @@ describe('app', async () => {
   const request = supertest(rpc.callback());
 
   it('should start === rpc.callback', async () => {
-    const request2 = supertest(rpc.start(30001));
+    const request2 = supertest(rpc.start(port));
     const res = await request2.get('/api/a?$p=["hello"]');
     expect(res.type).toEqual('application/json');
     expect(res.status).toEqual(200);