diff --git a/AliCloudDynamicDNS/AliCloudDynamicDNS.csproj b/AliCloudDynamicDNS/AliCloudDynamicDNS.csproj
index 8266181..6c857ca 100644
--- a/AliCloudDynamicDNS/AliCloudDynamicDNS.csproj
+++ b/AliCloudDynamicDNS/AliCloudDynamicDNS.csproj
@@ -2,14 +2,13 @@
 
     <PropertyGroup>
         <OutputType>Exe</OutputType>
-        <TargetFramework>net6.0</TargetFramework>
-        <LangVersion>8.0</LangVersion>
-        <Version>0.0.3</Version>
+        <TargetFramework>net8.0</TargetFramework>
+        <Version>0.0.4</Version>
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="McMaster.Extensions.CommandLineUtils" Version="4.0.1" />
-        <PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
+        <PackageReference Include="McMaster.Extensions.CommandLineUtils" Version="4.1.0" />
+        <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
         <PackageReference Include="Nito.AsyncEx.Context" Version="5.1.2" />
     </ItemGroup>
 
diff --git a/AliCloudDynamicDNS/Configuration/ConfigurationModel.cs b/AliCloudDynamicDNS/Configuration/ConfigurationModel.cs
index 153520a..2aa3a6f 100644
--- a/AliCloudDynamicDNS/Configuration/ConfigurationModel.cs
+++ b/AliCloudDynamicDNS/Configuration/ConfigurationModel.cs
@@ -20,6 +20,11 @@ public class ConfigurationModel
         // 主域名。
         public string MainDomain { get; set; }
 
+        /// <summary>
+        /// 公网 IP 获取服务器地址。
+        /// </summary>
+        public string PublicIpServer { get; set; }
+
         // 需要批量变更的子域名记录集合。
         public List<SubDomainRecord> SubDomains { get; set; }
     }
diff --git a/AliCloudDynamicDNS/Dockerfile b/AliCloudDynamicDNS/Dockerfile
index 32b35ea..4f7fe17 100644
--- a/AliCloudDynamicDNS/Dockerfile
+++ b/AliCloudDynamicDNS/Dockerfile
@@ -1,10 +1,10 @@
-FROM mcr.microsoft.com/dotnet/sdk:6.0 AS builder
+FROM mcr.microsoft.com/dotnet/sdk:8.0 AS builder
 WORKDIR /build
 COPY . .
 RUN dotnet restore
 RUN dotnet publish -c Release -o /publish
 
-FROM mcr.microsoft.com/dotnet/runtime:6.0 AS runtime
+FROM mcr.microsoft.com/dotnet/runtime:8.0 AS runtime
 WORKDIR /app
 COPY --from=builder /publish .
 
diff --git a/AliCloudDynamicDNS/Threading/StrongTimer.cs b/AliCloudDynamicDNS/Threading/StrongTimer.cs
index ae21bb5..89c707b 100644
--- a/AliCloudDynamicDNS/Threading/StrongTimer.cs
+++ b/AliCloudDynamicDNS/Threading/StrongTimer.cs
@@ -60,7 +60,7 @@ public void Stop()
             }
         }
 
-        private void Callback(object? state)
+        private void Callback(object state)
         {
             lock (_taskTimer)
             {
diff --git a/AliCloudDynamicDNS/Utility/NetworkHelper.cs b/AliCloudDynamicDNS/Utility/NetworkHelper.cs
index 6c5cc9f..e6a90b5 100644
--- a/AliCloudDynamicDNS/Utility/NetworkHelper.cs
+++ b/AliCloudDynamicDNS/Utility/NetworkHelper.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Net.Http;
 using System.Threading.Tasks;
+using AliCloudDynamicDNS.Configuration;
 
 namespace AliCloudDynamicDNS.Utility
 {
@@ -12,7 +13,7 @@ public static async Task<string> GetPublicNetworkIp()
             {
                 using (var client = new HttpClient())
                 {
-                    using (var request = new HttpRequestMessage(HttpMethod.Get, "http://182.254.141.185:9990/get-ip"))
+                    using (var request = new HttpRequestMessage(HttpMethod.Get, ConfigurationHelper.Configuration.PublicIpServer))
                     {
                         using (var response = await client.SendAsync(request))
                         {
diff --git a/AliCloudDynamicDNS/settings.json.example b/AliCloudDynamicDNS/settings.json.example
index 93d185d..a9a3259 100644
--- a/AliCloudDynamicDNS/settings.json.example
+++ b/AliCloudDynamicDNS/settings.json.example
@@ -5,6 +5,8 @@
   "AccessKey": "AccessKey",
   // 主域名。
   "MainDomain": "example.com",
+  // 公网 IP 获取服务器地址。
+  "PublicIpServer": "https://api.myzony.com/get-ip",
   // 需要批量变更的子域名记录集合。
   "SubDomains": [
     {
diff --git a/README.md b/README.md
index e9e835f..708241f 100644
--- a/README.md
+++ b/README.md
@@ -12,28 +12,30 @@ AliCloudDynamicDNS 是基于 .NET Core 开发的动态 DNS 解析工具，借助
 
 ```json
 {
-    // 阿里云的 Access Id。
-    "AccessId": "AccessId",
-    // 阿里云的 Access Key。
-    "AccessKey": "AccessKey",
-    // 主域名。
-    "MainDomain": "example.com",
-    // 需要批量变更的子域名记录集合。
-    "SubDomains": [
-        {
-            // 子域名记录类型。
-            "Type": "A",
-            // 子域名记录前缀。
-            "SubDomain": "sub1",
-            // TTL 时间。
-            "Interval": 600
-        },
-        {
-            "Type": "A",
-            "SubDomain": "sub2",
-            "Interval": 600
-        }
-    ]
+  // 阿里云的 Access Id。
+  "AccessId": "AccessId",
+  // 阿里云的 Access Key。
+  "AccessKey": "AccessKey",
+  // 主域名。
+  "MainDomain": "example.com",
+  // 公网 IP 获取服务器地址。
+  "PublicIpServer": "https://api.myzony.com/get-ip",
+  // 需要批量变更的子域名记录集合。
+  "SubDomains": [
+    {
+      // 子域名记录类型。
+      "Type": "A",
+      // 子域名记录前缀。
+      "SubDomain": "sub1",
+      // TTL 时间。
+      "Interval": 600
+    },
+    {
+      "Type": "A",
+      "SubDomain": "sub2",
+      "Interval": 600
+    }
+  ]
 }
 ```