diff --git a/binding/csharp/IP2Region.Net.BenchMark/IP2Region.Net.BenchMark.csproj b/binding/csharp/IP2Region.Net.BenchMark/IP2Region.Net.BenchMark.csproj
index 6a25b56..8d4f436 100644
--- a/binding/csharp/IP2Region.Net.BenchMark/IP2Region.Net.BenchMark.csproj
+++ b/binding/csharp/IP2Region.Net.BenchMark/IP2Region.Net.BenchMark.csproj
@@ -2,7 +2,7 @@
 
     <PropertyGroup>
         <OutputType>Exe</OutputType>
-        <TargetFramework>net6.0</TargetFramework>
+        <TargetFramework>net9.0</TargetFramework>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
     </PropertyGroup>
diff --git a/binding/csharp/IP2Region.Net.Test/IP2Region.Net.Test.csproj b/binding/csharp/IP2Region.Net.Test/IP2Region.Net.Test.csproj
index a28ea7c..9e40761 100644
--- a/binding/csharp/IP2Region.Net.Test/IP2Region.Net.Test.csproj
+++ b/binding/csharp/IP2Region.Net.Test/IP2Region.Net.Test.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>