diff --git a/package.json b/package.json
index ec41af4..4c6de60 100644
--- a/package.json
+++ b/package.json
@@ -46,7 +46,8 @@
     "utility": "^2.3.0"
   },
   "peerDependencies": {
-    "mocha": "^10 || ^11"
+    "mocha": "^10 || ^11",
+    "egg": "^4"
   },
   "devDependencies": {
     "@arethetypeswrong/cli": "^0.17.1",
@@ -55,21 +56,21 @@
     "@eggjs/tegg-config": "^3.2.2",
     "@eggjs/tegg-controller-plugin": "^3.2.2",
     "@eggjs/tegg-plugin": "^3.2.2",
+    "@eggjs/tracer": "^3.0.0",
     "@eggjs/tsconfig": "1",
     "@types/methods": "^1.1.4",
     "@types/mocha": "10",
     "@types/node": "22",
-    "egg": "beta",
+    "egg": "^4.0.8",
     "egg-errors": "^2.2.1",
-    "egg-tracer": "^2.0.0",
     "eslint": "8",
     "eslint-config-egg": "14",
-    "mocha": "^11.0.1",
-    "pedding": "^2.0.0",
+    "mocha": "11",
+    "pedding": "2",
     "rimraf": "6",
     "tsd": "^0.31.2",
     "tshy": "3",
-    "tshy-after": "^1.3.1",
+    "tshy-after": "1",
     "typescript": "5"
   },
   "scripts": {
diff --git a/src/app/extend/application.ts b/src/app/extend/application.ts
index 8dc80c6..21eccf3 100644
--- a/src/app/extend/application.ts
+++ b/src/app/extend/application.ts
@@ -5,9 +5,9 @@ import assert from 'node:assert';
 import mergeDescriptors from 'merge-descriptors';
 import { isAsyncFunction, isObject } from 'is-type-of';
 import { mock, restore } from 'mm';
-import type { HttpClient } from 'urllib';
 import { Transport, EggLogger, LoggerLevel, LoggerMeta } from 'egg-logger';
-import { EggCore, EggCoreOptions, Context } from '@eggjs/core';
+import { Application, type Context, type Agent } from 'egg';
+import type { MockAgent } from 'urllib';
 import { getMockAgent, restoreMockAgent } from '../../lib/mock_agent.js';
 import {
   createMockHttpClient, MockResultFunction,
@@ -16,6 +16,7 @@ import {
 } from '../../lib/mock_httpclient.js';
 import { request as supertestRequest, EggTestRequest } from '../../lib/supertest.js';
 import { MockOptions } from '../../lib/types.js';
+import type AgentUnittest from './agent.js';
 
 const debug = debuglog('@eggjs/mock/app/extend/application');
 
@@ -40,18 +41,13 @@ export interface MockContextData {
 }
 
 export interface MockContext extends Context {
-  service: any;
 }
 
-export default abstract class ApplicationUnittest extends EggCore {
+export default abstract class ApplicationUnittest extends Application {
   [key: string]: any;
-  declare options: MockOptions & EggCoreOptions;
+  declare options: Application['options'] & MockOptions;
   _mockHttpClient?: MockHttpClientMethod;
-  declare logger: EggLogger;
-  declare coreLogger: EggLogger;
-  abstract getLogger(name: string): EggLogger;
-  declare httpClient: HttpClient;
-  declare httpclient: HttpClient;
+  declare agent: AgentUnittest & Agent;
 
   /**
    * mock Context
@@ -117,7 +113,7 @@ export default abstract class ApplicationUnittest extends EggCore {
       mockCtxStorage: false,
       reuseCtxStorage: false,
     });
-    return await this.ctxStorage.run(ctx as any, async () => {
+    return await this.ctxStorage.run(ctx, async () => {
       return await fn(ctx);
     });
   }
@@ -346,7 +342,7 @@ export default abstract class ApplicationUnittest extends EggCore {
    * get mock httpclient agent
    * @function App#mockHttpclientAgent
    */
-  mockAgent() {
+  mockAgent(): MockAgent {
     return getMockAgent(this);
   }
 
diff --git a/src/lib/app.ts b/src/lib/app.ts
index d4cc750..64fb5e2 100644
--- a/src/lib/app.ts
+++ b/src/lib/app.ts
@@ -5,6 +5,7 @@ import path from 'node:path';
 import { Base } from 'sdk-base';
 import { detectPort } from 'detect-port';
 import { importModule } from '@eggjs/utils';
+import { type Agent } from 'egg';
 import { sleep, rimraf, getProperty, getSourceDirname } from './utils.js';
 import { formatOptions } from './format_options.js';
 import { context } from './context.js';
@@ -93,7 +94,7 @@ class MockApplicationWorker extends Base {
 
     // https://github.com/eggjs/egg/blob/8bb7c7e7d59d6aeca4b2ed1eb580368dcb731a4d/lib/egg.js#L125
     // egg single mode mount this at start(), so egg-mock should impel it.
-    app.agent = agent;
+    app.agent = agent as AgentUnittest & Agent;
     Reflect.set(agent, 'app', app);
 
     // egg-mock plugin need to override egg context
diff --git a/test/app_proxy.test.ts b/test/app_proxy.test.ts
index c660b56..db63be8 100644
--- a/test/app_proxy.test.ts
+++ b/test/app_proxy.test.ts
@@ -30,7 +30,7 @@ describe('test/app_proxy.test.ts', () => {
 
     it('should not set property', async () => {
       assert.throws(() => {
-        app.curl = function* mockCurl() {
+        (app as any).curl = async function mockCurl() {
           return 'mock';
         };
       }, /can't set curl before ready/);
@@ -100,11 +100,11 @@ describe('test/app_proxy.test.ts', () => {
     after(() => app.close());
 
     it('should override property with setter', async () => {
-      app.curl = async function mockCurl() {
+      (app as any).curl = async function mockCurl() {
         return 'mock';
       };
-      const data = await app.curl();
-      assert(data === 'mock');
+      const data = await app.curl('http://127.0.0.1:7001');
+      assert.equal(data, 'mock');
     });
 
     it('should ignore when set property on MockApplication', async () => {
diff --git a/test/fixtures/tegg-app-esm/config/plugin.js b/test/fixtures/tegg-app-esm/config/plugin.js
index 4275126..548f166 100644
--- a/test/fixtures/tegg-app-esm/config/plugin.js
+++ b/test/fixtures/tegg-app-esm/config/plugin.js
@@ -12,7 +12,7 @@ export default {
     enable: true,
   },
   tracer: {
-    package: 'egg-tracer',
+    package: '@eggjs/tracer',
     enable: true,
   },
 };
diff --git a/test/fixtures/tegg-app/config/plugin.js b/test/fixtures/tegg-app/config/plugin.js
index 6745be6..1d2e5b4 100644
--- a/test/fixtures/tegg-app/config/plugin.js
+++ b/test/fixtures/tegg-app/config/plugin.js
@@ -12,7 +12,7 @@ module.exports = {
     enable: true,
   },
   tracer: {
-    package: 'egg-tracer',
+    package: '@eggjs/tracer',
     enable: true,
   },
 };