diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 9f17d8b..e8eef75 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -30,7 +30,7 @@ jobs:
     - name: Install .NET Core
       uses: actions/setup-dotnet@v3
       with:
-        dotnet-version: 6.0.x
+        dotnet-version: 8.0.x
     
     # Restore dependencies
     - name: Restore dependencies
diff --git a/README.md b/README.md
index 0f7c1e8..cb42e97 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@
 [Wiki](https://github.com/AutumnSky1010/SoundMaker/wiki)
 
 ## ⛰️要件
-.NET 6 以降
+.NET 8 以降
 
 ## ⏬インストール方法
 ### NuGet
@@ -126,7 +126,7 @@ You can do The following content with this library.
 [Wiki](https://github.com/AutumnSky1010/SoundMaker/wiki)
 
 ## ⛰️Requirement
-.NET 6 or later
+.NET 8 or later
 
 ## ⏬Installation
 ### NuGet
diff --git a/src/SoundMaker/SoundMaker.csproj b/src/SoundMaker/SoundMaker.csproj
index f6dd50a..6b86504 100644
--- a/src/SoundMaker/SoundMaker.csproj
+++ b/src/SoundMaker/SoundMaker.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Library</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <GeneratePackageOnBuild>True</GeneratePackageOnBuild>
diff --git a/src/SoundMakerConsole/SoundMakerConsole.csproj b/src/SoundMakerConsole/SoundMakerConsole.csproj
index 05cffd2..8ef5e02 100644
--- a/src/SoundMakerConsole/SoundMakerConsole.csproj
+++ b/src/SoundMakerConsole/SoundMakerConsole.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>
diff --git a/test/SoundMakerTests.csproj b/test/SoundMakerTests.csproj
index 0f17d1a..9fd1171 100644
--- a/test/SoundMakerTests.csproj
+++ b/test/SoundMakerTests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>