diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 67e6e57..722202a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,7 +28,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 8.0.x
+        dotnet-version: 9.0.x
 
     - name: '[Ubuntu] Set version to -ci-${{ github.run_number }}'
       if: matrix.os == 'ubuntu-latest'
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 3e3672f..70e4cc9 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -56,7 +56,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 8.0.x
+        dotnet-version: 9.0.x
 
     - name: Set version to ${{ github.event.inputs.new_package_version }}
       shell: pwsh
diff --git a/src/AoCHelper.PoC.Library/AoCHelper.PoC.Library.csproj b/src/AoCHelper.PoC.Library/AoCHelper.PoC.Library.csproj
index 22af34d..0d4f92c 100644
--- a/src/AoCHelper.PoC.Library/AoCHelper.PoC.Library.csproj
+++ b/src/AoCHelper.PoC.Library/AoCHelper.PoC.Library.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/AoCHelper.PoC/AoCHelper.PoC.csproj b/src/AoCHelper.PoC/AoCHelper.PoC.csproj
index 28c7fcc..5aa14b6 100644
--- a/src/AoCHelper.PoC/AoCHelper.PoC.csproj
+++ b/src/AoCHelper.PoC/AoCHelper.PoC.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <OutputType>Exe</OutputType>
   </PropertyGroup>
 
diff --git a/src/AoCHelper/AoCHelper.csproj b/src/AoCHelper/AoCHelper.csproj
index 533d139..8f22152 100644
--- a/src/AoCHelper/AoCHelper.csproj
+++ b/src/AoCHelper/AoCHelper.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net8.0;net7.0;net6.0;netstandard2.1;netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>net9.0;net8.0;netstandard2.1;netstandard2.0</TargetFrameworks>
     <IncludeSymbols>true</IncludeSymbols>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
     <Title>AoCHelper</Title>
@@ -25,7 +25,7 @@
   </ItemGroup>
 
   <ItemGroup Label="https://github.com/dotnet/roslyn/issues/45510">
-    <Compile Remove="IsExternalInit.cs" Condition="'$(TargetFramework)' == 'net6.0' OR '$(TargetFramework)' == 'net7.0' OR '$(TargetFramework)' == 'net8.0'" />
+    <Compile Remove="IsExternalInit.cs" Condition="'$(TargetFramework)' == 'net8.0' OR '$(TargetFramework)' == 'net9.0'" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
diff --git a/tests/AoCHelper.Test/AoCHelper.Test.csproj b/tests/AoCHelper.Test/AoCHelper.Test.csproj
index e32b813..cc8a0b2 100644
--- a/tests/AoCHelper.Test/AoCHelper.Test.csproj
+++ b/tests/AoCHelper.Test/AoCHelper.Test.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <IsPackable>false</IsPackable>
   </PropertyGroup>