diff --git a/.github/workflows/publish-beta.yml b/.github/workflows/publish-beta.yml
index 1dc4666..194e97c 100644
--- a/.github/workflows/publish-beta.yml
+++ b/.github/workflows/publish-beta.yml
@@ -20,7 +20,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v2
       with:
-        dotnet-version: 7.0.x
+        dotnet-version: 8.0.x
     - name: Restore
       run: |
         dotnet restore NewLife.Modbus/NewLife.Modbus.csproj
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 2e71f7a..5dbc073 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -15,7 +15,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v2
       with:
-        dotnet-version: 7.0.x
+        dotnet-version: 8.0.x
     - name: Restore
       run: |
         dotnet restore NewLife.Modbus/NewLife.Modbus.csproj
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index c1e31e2..284c05d 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -16,7 +16,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v2
       with:
-        dotnet-version: 7.0.x
+        dotnet-version: 8.0.x
     - name: Build
       run: dotnet build -c Release
 
diff --git a/NewLife.ModbusRTU/NewLife.ModbusRTU.csproj b/NewLife.ModbusRTU/NewLife.ModbusRTU.csproj
index cd1deb2..25cc6fb 100644
--- a/NewLife.ModbusRTU/NewLife.ModbusRTU.csproj
+++ b/NewLife.ModbusRTU/NewLife.ModbusRTU.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.1;netstandard2.0;net45;net461;net6.0;net7.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.1;netstandard2.0;net45;net461;net6.0;net7.0;net8.0</TargetFrameworks>
     <RootNamespace>NewLife.Serial</RootNamespace>
     <AssemblyTitle>ModbusRTU协议</AssemblyTitle>
     <Description>串口ModbusRTU协议</Description>
diff --git a/Readme.MD b/Readme.MD
index a82ec66..220e73b 100644
--- a/Readme.MD
+++ b/Readme.MD
@@ -17,7 +17,7 @@ Nuget：NewLife.Modbus / NewLife.ModbusRT
 
 
 ## 新生命项目矩阵
-各项目默认支持net7.0/netstandard2.1/netstandard2.0/net4.61/net4.5，旧版（2023.0401）支持net4.0/net2.0  
+各项目默认支持net8.0/net7.0/netstandard2.1/netstandard2.0/net4.61/net4.5，旧版（2023.0401）支持net4.0/net2.0  
 
 |                               项目                               | 年份  | 说明                                                                                   |
 | :--------------------------------------------------------------: | :---: | -------------------------------------------------------------------------------------- |
diff --git a/Test/Test.csproj b/Test/Test.csproj
index 1b76d67..cf353e7 100644
--- a/Test/Test.csproj
+++ b/Test/Test.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <Company>新生命开发团队</Company>
     <Copyright>©2002-2022 NewLife</Copyright>
     <VersionPrefix>1.0</VersionPrefix>
diff --git a/WinModbus/WinModbus.csproj b/WinModbus/WinModbus.csproj
index 337f40a..02a3516 100644
--- a/WinModbus/WinModbus.csproj
+++ b/WinModbus/WinModbus.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>WinExe</OutputType>
-    <TargetFramework>net7.0-windows</TargetFramework>
+    <TargetFramework>net8.0-windows</TargetFramework>
     <Company>新生命开发团队</Company>
     <Copyright>©2002-2023 NewLife</Copyright>
     <VersionPrefix>1.0</VersionPrefix>
diff --git a/XUnitTest/XUnitTest.csproj b/XUnitTest/XUnitTest.csproj
index 9ca66bc..77f6015 100644
--- a/XUnitTest/XUnitTest.csproj
+++ b/XUnitTest/XUnitTest.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <OutputPath>..\Bin\UnitTest</OutputPath>
 
     <IsPackable>false</IsPackable>