diff --git a/tests/AnthropicClient.Tests/AnthropicClient.Tests.csproj b/tests/AnthropicClient.Tests/AnthropicClient.Tests.csproj
index 0a5f3db..6be8f1a 100644
--- a/tests/AnthropicClient.Tests/AnthropicClient.Tests.csproj
+++ b/tests/AnthropicClient.Tests/AnthropicClient.Tests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <IsPackable>false</IsPackable>
@@ -54,7 +54,7 @@
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
   </ItemGroup>
-  
+
   <ItemGroup>
     <None Update="Files/**">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>