diff --git a/server.js b/server.js
index 8b42cb6..90502a6 100644
--- a/server.js
+++ b/server.js
@@ -30,8 +30,8 @@ const origins = parseOrigins(process.env.ALLOWED_ORIGIN);
 const isAllowedOrigin = (origin) => _isAllowedOrigin(origin, origins);
 const getCorsOrigin = (origin) => _resolveCorsOrigin(origin, origins);
 const DEFAULT_SIMYO_CLIENT_PLATFORM = 'ios';
-const DEFAULT_SIMYO_CLIENT_VERSION = '4.23.5';
-const DEFAULT_SIMYO_USER_AGENT = 'MijnSimyoFT/4.23.5 (iOS 26.3; iPhone16,1)';
+const DEFAULT_SIMYO_CLIENT_VERSION = '4.28.0';
+const DEFAULT_SIMYO_USER_AGENT = 'MijnSimyoFT/4.28.0 (iOS 26.3; iPhone16,1)';
 
 // 启动时环境检查
 if (!INTERNAL_FUNCTION_KEY) {
diff --git a/src/simyo/js/modules/api-config.js b/src/simyo/js/modules/api-config.js
index 9653ba1..1a93948 100644
--- a/src/simyo/js/modules/api-config.js
+++ b/src/simyo/js/modules/api-config.js
@@ -12,8 +12,8 @@ import { t } from '../../../js/modules/i18n.js';
 export const simyoConfig = {
     clientToken: "e77b7e2f43db41bb95b17a2a11581a38",
     clientPlatform: "ios",
-    clientVersion: "4.23.5",
-    userAgent: "MijnSimyoFT/4.23.5 (iOS 26.3; iPhone16,1)"
+    clientVersion: "4.28.0",
+    userAgent: "MijnSimyoFT/4.28.0 (iOS 26.3; iPhone16,1)"
 };
 
 /**
diff --git a/src/simyo/simyo_proxy_server.js b/src/simyo/simyo_proxy_server.js
index 5e42da8..dd6058f 100644
--- a/src/simyo/simyo_proxy_server.js
+++ b/src/simyo/simyo_proxy_server.js
@@ -39,8 +39,8 @@ const SIMYO_CONFIG = {
     headers: {
         'X-Client-Token': 'e77b7e2f43db41bb95b17a2a11581a38',
         'X-Client-Platform': 'ios',
-        'X-Client-Version': '4.23.5',
-        'User-Agent': 'MijnSimyoFT/4.23.5 (iOS 26.3; iPhone16,1)',
+        'X-Client-Version': '4.28.0',
+        'User-Agent': 'MijnSimyoFT/4.28.0 (iOS 26.3; iPhone16,1)',
         'Content-Type': 'application/json',
         'Connection': 'keep-alive',
         'Accept-Encoding': 'gzip, deflate, br'
diff --git a/tests/test_simyo_esim.html b/tests/test_simyo_esim.html
index 74b1925..214cd4a 100644
--- a/tests/test_simyo_esim.html
+++ b/tests/test_simyo_esim.html
@@ -538,8 +538,8 @@
             const headers = {
                 'X-Client-Token': 'e77b7e2f43db41bb95b17a2a11581a38',
                 'X-Client-Platform': 'ios',
-                'X-Client-Version': '4.23.5',
-                'User-Agent': 'MijnSimyoFT/4.23.5 (iOS 26.3; iPhone16,1)',
+                'X-Client-Version': '4.28.0',
+                'User-Agent': 'MijnSimyoFT/4.28.0 (iOS 26.3; iPhone16,1)',
                 'Content-Type': 'application/json',
                 'Connection': 'keep-alive',
                 'Accept-Encoding': 'gzip, deflate, br'