diff --git a/src/Core/CsMic.Core.csproj b/src/Core/CsMic.Core.csproj
index 7daac77..088f37d 100644
--- a/src/Core/CsMic.Core.csproj
+++ b/src/Core/CsMic.Core.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
 	<PropertyGroup>
-		<TargetFramework>net9.0</TargetFramework>
+		<TargetFramework>netstandard2.1</TargetFramework>
 		<RootNamespace>CSMic</RootNamespace>
 		<ImplicitUsings>enable</ImplicitUsings>
 		<Nullable>enable</Nullable>
diff --git a/src/StandardLibrary/CsMic.StandardLibrary.csproj b/src/StandardLibrary/CsMic.StandardLibrary.csproj
index 268636f..e718255 100644
--- a/src/StandardLibrary/CsMic.StandardLibrary.csproj
+++ b/src/StandardLibrary/CsMic.StandardLibrary.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net9.0</TargetFramework>
+    <TargetFramework>netstandard2.1</TargetFramework>
     <RootNamespace>CSMic.StandardLibrary</RootNamespace>
     <AssemblyName>CSMic.StandardLibrary</AssemblyName>
     <ImplicitUsings>enable</ImplicitUsings>
@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <ProjectReference Include="..\Core\CSMic.Core.csproj" />
+    <ProjectReference Include="..\Core\CsMic.Core.csproj" />
   </ItemGroup>
 
 </Project>
diff --git a/src/Tests/CSMic.Tests.csproj b/src/Tests/CSMic.Tests.csproj
index 8958b81..77961d7 100644
--- a/src/Tests/CSMic.Tests.csproj
+++ b/src/Tests/CSMic.Tests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net9.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <LangVersion>latest</LangVersion>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
@@ -19,8 +19,8 @@
   </ItemGroup>
 
   <ItemGroup>
-    <ProjectReference Include="..\Core\CSMic.Core.csproj" />
-    <ProjectReference Include="..\StandardLibrary\CSMic.StandardLibrary.csproj" />
+    <ProjectReference Include="..\Core\CsMic.Core.csproj" />
+    <ProjectReference Include="..\StandardLibrary\CsMic.StandardLibrary.csproj" />
   </ItemGroup>
 
   <ItemGroup>