diff --git a/src/Aiursoft.ChessServer/Aiursoft.ChessServer.csproj b/src/Aiursoft.ChessServer/Aiursoft.ChessServer.csproj
index 768ba3e..4a49666 100644
--- a/src/Aiursoft.ChessServer/Aiursoft.ChessServer.csproj
+++ b/src/Aiursoft.ChessServer/Aiursoft.ChessServer.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <AssemblyName>Aiursoft.ChessServer</AssemblyName>
     <RootNamespace>Aiursoft.ChessServer</RootNamespace>
     <IsTestProject>false</IsTestProject>
diff --git a/tests/Aiursoft.ChessServer.Tests/Aiursoft.ChessServer.Tests.csproj b/tests/Aiursoft.ChessServer.Tests/Aiursoft.ChessServer.Tests.csproj
index a265334..b4fe387 100644
--- a/tests/Aiursoft.ChessServer.Tests/Aiursoft.ChessServer.Tests.csproj
+++ b/tests/Aiursoft.ChessServer.Tests/Aiursoft.ChessServer.Tests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <RootNamespace>Aiursoft.ChessServer.Tests</RootNamespace>
     <IsTestProject>true</IsTestProject>
     <IsPackable>false</IsPackable>