diff --git a/.azure-pipelines/build.yml b/.azure-pipelines/build.yml
index f709555f..3dcb30b0 100644
--- a/.azure-pipelines/build.yml
+++ b/.azure-pipelines/build.yml
@@ -24,6 +24,10 @@ jobs:
       inputs:
         packageType: 'sdk'
         version: 8.0.x
+    - task: UseDotNet@2
+      inputs:
+        packageType: 'sdk'
+        version: 9.0.x
 
     - script: dotnet test -c Release --logger trx
       displayName: dotnet test
@@ -45,6 +49,10 @@ jobs:
       inputs:
         packageType: 'sdk'
         version: 8.0.x
+    - task: UseDotNet@2
+      inputs:
+        packageType: 'sdk'
+        version: 9.0.x
     - script: dotnet test -c Release --logger trx
       displayName: dotnet test
     - task: PublishTestResults@2
diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 63e08cec..890b5c90 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -34,6 +34,7 @@ jobs:
           3.1.x
           6.0.x
           8.0.x
+          9.0.x
       env:
         NUGET_AUTH_TOKEN: ${{ steps.op-load-secret.outputs.NUGET_AUTH_TOKEN }}
 
diff --git a/global.json b/global.json
index 501e79a8..cdbb589e 100644
--- a/global.json
+++ b/global.json
@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "8.0.100",
+    "version": "9.0.100",
     "rollForward": "latestFeature"
   }
-}
\ No newline at end of file
+}
diff --git a/perf/Cocona.Benchmark.External/Cocona.Benchmark.External.csproj b/perf/Cocona.Benchmark.External/Cocona.Benchmark.External.csproj
index a62dd814..c847bb24 100644
--- a/perf/Cocona.Benchmark.External/Cocona.Benchmark.External.csproj
+++ b/perf/Cocona.Benchmark.External/Cocona.Benchmark.External.csproj
@@ -2,20 +2,23 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <nullable>annotations</nullable>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="BenchmarkDotNet" Version="0.13.10" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.14.0" />
     <PackageReference Include="CliFx" Version="2.3.5" />
     <PackageReference Include="clipr" Version="1.6.1" />
     <PackageReference Include="CommandLineParser" Version="2.9.1" />
-    <PackageReference Include="ConsoleAppFramework" Version="4.2.4" />
-    <PackageReference Include="McMaster.Extensions.CommandLineUtils" Version="4.1.0" />
+    <PackageReference Include="ConsoleAppFramework" Version="5.2.4">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="McMaster.Extensions.CommandLineUtils" Version="4.1.1" />
     <PackageReference Include="PowerArgs" Version="4.0.3" />
-    <PackageReference Include="System.CommandLine" Version="2.0.0-beta1.20071.2" />
+    <PackageReference Include="System.CommandLine" Version="2.0.0-beta4.22272.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/perf/Cocona.Benchmark.Performance/Cocona.Benchmark.Performance.csproj b/perf/Cocona.Benchmark.Performance/Cocona.Benchmark.Performance.csproj
index 0ca757a1..2456bd03 100644
--- a/perf/Cocona.Benchmark.Performance/Cocona.Benchmark.Performance.csproj
+++ b/perf/Cocona.Benchmark.Performance/Cocona.Benchmark.Performance.csproj
@@ -2,13 +2,13 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="BenchmarkDotNet" Version="0.13.10" />
-    <PackageReference Include="Cocona" Version="1.1.0" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.14.0" />
+    <PackageReference Include="Cocona" Version="2.2.0" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/samples/Advanced.CommandMethodForwarding/CoconaSample.Advanced.CommandMethodForwarding.csproj b/samples/Advanced.CommandMethodForwarding/CoconaSample.Advanced.CommandMethodForwarding.csproj
index 2823c137..913ec6c8 100644
--- a/samples/Advanced.CommandMethodForwarding/CoconaSample.Advanced.CommandMethodForwarding.csproj
+++ b/samples/Advanced.CommandMethodForwarding/CoconaSample.Advanced.CommandMethodForwarding.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/samples/Advanced.GenericHost/CoconaSample.Advanced.GenericHost.csproj b/samples/Advanced.GenericHost/CoconaSample.Advanced.GenericHost.csproj
index 8d1e8040..26373b06 100644
--- a/samples/Advanced.GenericHost/CoconaSample.Advanced.GenericHost.csproj
+++ b/samples/Advanced.GenericHost/CoconaSample.Advanced.GenericHost.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/samples/Advanced.HelpOnDemand/CoconaSample.Advanced.HelpOnDemand.csproj b/samples/Advanced.HelpOnDemand/CoconaSample.Advanced.HelpOnDemand.csproj
index fed66508..e7086c79 100644
--- a/samples/Advanced.HelpOnDemand/CoconaSample.Advanced.HelpOnDemand.csproj
+++ b/samples/Advanced.HelpOnDemand/CoconaSample.Advanced.HelpOnDemand.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/samples/Advanced.HelpTransformer/CoconaSample.Advanced.HelpTransformer.csproj b/samples/Advanced.HelpTransformer/CoconaSample.Advanced.HelpTransformer.csproj
index 8d11cd81..b5626aa6 100644
--- a/samples/Advanced.HelpTransformer/CoconaSample.Advanced.HelpTransformer.csproj
+++ b/samples/Advanced.HelpTransformer/CoconaSample.Advanced.HelpTransformer.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-      <TargetFramework>net8.0</TargetFramework>
+      <TargetFramework>net9.0</TargetFramework>
       <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/samples/Advanced.JsonValueConverter/CoconaSample.Advanced.JsonValueConverter.csproj b/samples/Advanced.JsonValueConverter/CoconaSample.Advanced.JsonValueConverter.csproj
index 934ff4d7..3fdb734d 100644
--- a/samples/Advanced.JsonValueConverter/CoconaSample.Advanced.JsonValueConverter.csproj
+++ b/samples/Advanced.JsonValueConverter/CoconaSample.Advanced.JsonValueConverter.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/samples/Advanced.Localization/CoconaSample.Advanced.Localization.csproj b/samples/Advanced.Localization/CoconaSample.Advanced.Localization.csproj
index e025a1b9..41b5f335 100644
--- a/samples/Advanced.Localization/CoconaSample.Advanced.Localization.csproj
+++ b/samples/Advanced.Localization/CoconaSample.Advanced.Localization.csproj
@@ -2,13 +2,13 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.Localization" Version="8.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Localization" Version="9.0.0" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/samples/Advanced.OptionLikeCommand/CoconaSample.Advanced.OptionLikeCommand.csproj b/samples/Advanced.OptionLikeCommand/CoconaSample.Advanced.OptionLikeCommand.csproj
index 2823c137..913ec6c8 100644
--- a/samples/Advanced.OptionLikeCommand/CoconaSample.Advanced.OptionLikeCommand.csproj
+++ b/samples/Advanced.OptionLikeCommand/CoconaSample.Advanced.OptionLikeCommand.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/samples/Advanced.PreventMultipleInstances/CoconaSample.Advanced.PreventMultipleInstances.csproj b/samples/Advanced.PreventMultipleInstances/CoconaSample.Advanced.PreventMultipleInstances.csproj
index 8d1e8040..26373b06 100644
--- a/samples/Advanced.PreventMultipleInstances/CoconaSample.Advanced.PreventMultipleInstances.csproj
+++ b/samples/Advanced.PreventMultipleInstances/CoconaSample.Advanced.PreventMultipleInstances.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/samples/Advanced.ShellCompletionCandidates/CoconaSample.Advanced.ShellCompletionCandidates.csproj b/samples/Advanced.ShellCompletionCandidates/CoconaSample.Advanced.ShellCompletionCandidates.csproj
index 2823c137..913ec6c8 100644
--- a/samples/Advanced.ShellCompletionCandidates/CoconaSample.Advanced.ShellCompletionCandidates.csproj
+++ b/samples/Advanced.ShellCompletionCandidates/CoconaSample.Advanced.ShellCompletionCandidates.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/samples/CoconaSample.Advanced.GenericHost.HostApplicationBuilder/CoconaSample.Advanced.GenericHost.HostApplicationBuilder.csproj b/samples/CoconaSample.Advanced.GenericHost.HostApplicationBuilder/CoconaSample.Advanced.GenericHost.HostApplicationBuilder.csproj
index d3678679..62e26437 100644
--- a/samples/CoconaSample.Advanced.GenericHost.HostApplicationBuilder/CoconaSample.Advanced.GenericHost.HostApplicationBuilder.csproj
+++ b/samples/CoconaSample.Advanced.GenericHost.HostApplicationBuilder/CoconaSample.Advanced.GenericHost.HostApplicationBuilder.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
    <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>
diff --git a/samples/GettingStarted.MinimalApp/CoconaSample.GettingStarted.MinimalApp.csproj b/samples/GettingStarted.MinimalApp/CoconaSample.GettingStarted.MinimalApp.csproj
index 8d1e8040..26373b06 100644
--- a/samples/GettingStarted.MinimalApp/CoconaSample.GettingStarted.MinimalApp.csproj
+++ b/samples/GettingStarted.MinimalApp/CoconaSample.GettingStarted.MinimalApp.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/samples/GettingStarted.SubCommandApp/CoconaSample.GettingStarted.SubCommandApp.csproj b/samples/GettingStarted.SubCommandApp/CoconaSample.GettingStarted.SubCommandApp.csproj
index 8d1e8040..26373b06 100644
--- a/samples/GettingStarted.SubCommandApp/CoconaSample.GettingStarted.SubCommandApp.csproj
+++ b/samples/GettingStarted.SubCommandApp/CoconaSample.GettingStarted.SubCommandApp.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/samples/GettingStarted.TypicalSimpleApp/CoconaSample.GettingStarted.TypicalSimpleApp.csproj b/samples/GettingStarted.TypicalSimpleApp/CoconaSample.GettingStarted.TypicalSimpleApp.csproj
index 8d1e8040..26373b06 100644
--- a/samples/GettingStarted.TypicalSimpleApp/CoconaSample.GettingStarted.TypicalSimpleApp.csproj
+++ b/samples/GettingStarted.TypicalSimpleApp/CoconaSample.GettingStarted.TypicalSimpleApp.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/samples/InAction.AppConfiguration/CoconaSample.InAction.AppConfiguration.csproj b/samples/InAction.AppConfiguration/CoconaSample.InAction.AppConfiguration.csproj
index 736dc52c..ee5a36cd 100644
--- a/samples/InAction.AppConfiguration/CoconaSample.InAction.AppConfiguration.csproj
+++ b/samples/InAction.AppConfiguration/CoconaSample.InAction.AppConfiguration.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/samples/InAction.CommandFilter/CoconaSample.InAction.CommandFilter.csproj b/samples/InAction.CommandFilter/CoconaSample.InAction.CommandFilter.csproj
index 8d1e8040..26373b06 100644
--- a/samples/InAction.CommandFilter/CoconaSample.InAction.CommandFilter.csproj
+++ b/samples/InAction.CommandFilter/CoconaSample.InAction.CommandFilter.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/samples/InAction.CommandOptionOverload/CoconaSample.InAction.CommandOptionOverload.csproj b/samples/InAction.CommandOptionOverload/CoconaSample.InAction.CommandOptionOverload.csproj
index 8d1e8040..26373b06 100644
--- a/samples/InAction.CommandOptionOverload/CoconaSample.InAction.CommandOptionOverload.csproj
+++ b/samples/InAction.CommandOptionOverload/CoconaSample.InAction.CommandOptionOverload.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/samples/InAction.CommandOptions/CoconaSample.InAction.CommandOptions.csproj b/samples/InAction.CommandOptions/CoconaSample.InAction.CommandOptions.csproj
index 8d1e8040..26373b06 100644
--- a/samples/InAction.CommandOptions/CoconaSample.InAction.CommandOptions.csproj
+++ b/samples/InAction.CommandOptions/CoconaSample.InAction.CommandOptions.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/samples/InAction.DependencyInjection/CoconaSample.InAction.DependencyInjection.csproj b/samples/InAction.DependencyInjection/CoconaSample.InAction.DependencyInjection.csproj
index 8d1e8040..26373b06 100644
--- a/samples/InAction.DependencyInjection/CoconaSample.InAction.DependencyInjection.csproj
+++ b/samples/InAction.DependencyInjection/CoconaSample.InAction.DependencyInjection.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/samples/InAction.ExitCode/CoconaSample.InAction.ExitCode.csproj b/samples/InAction.ExitCode/CoconaSample.InAction.ExitCode.csproj
index 8d1e8040..26373b06 100644
--- a/samples/InAction.ExitCode/CoconaSample.InAction.ExitCode.csproj
+++ b/samples/InAction.ExitCode/CoconaSample.InAction.ExitCode.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/samples/InAction.HandleShutdownSignal/CoconaSample.InAction.HandleShutdownSignal.csproj b/samples/InAction.HandleShutdownSignal/CoconaSample.InAction.HandleShutdownSignal.csproj
index 8d1e8040..26373b06 100644
--- a/samples/InAction.HandleShutdownSignal/CoconaSample.InAction.HandleShutdownSignal.csproj
+++ b/samples/InAction.HandleShutdownSignal/CoconaSample.InAction.HandleShutdownSignal.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/samples/InAction.ManyArguments/CoconaSample.InAction.ManyArguments.csproj b/samples/InAction.ManyArguments/CoconaSample.InAction.ManyArguments.csproj
index 8d1e8040..26373b06 100644
--- a/samples/InAction.ManyArguments/CoconaSample.InAction.ManyArguments.csproj
+++ b/samples/InAction.ManyArguments/CoconaSample.InAction.ManyArguments.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/samples/InAction.MultipleCommandTypes/CoconaSample.InAction.MultipleCommandTypes.csproj b/samples/InAction.MultipleCommandTypes/CoconaSample.InAction.MultipleCommandTypes.csproj
index 8d1e8040..26373b06 100644
--- a/samples/InAction.MultipleCommandTypes/CoconaSample.InAction.MultipleCommandTypes.csproj
+++ b/samples/InAction.MultipleCommandTypes/CoconaSample.InAction.MultipleCommandTypes.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/samples/InAction.ParameterSet/CoconaSample.InAction.ParameterSet.csproj b/samples/InAction.ParameterSet/CoconaSample.InAction.ParameterSet.csproj
index 8d1e8040..26373b06 100644
--- a/samples/InAction.ParameterSet/CoconaSample.InAction.ParameterSet.csproj
+++ b/samples/InAction.ParameterSet/CoconaSample.InAction.ParameterSet.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/samples/InAction.Validation/CoconaSample.InAction.Validation.csproj b/samples/InAction.Validation/CoconaSample.InAction.Validation.csproj
index fed66508..e7086c79 100644
--- a/samples/InAction.Validation/CoconaSample.InAction.Validation.csproj
+++ b/samples/InAction.Validation/CoconaSample.InAction.Validation.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
diff --git a/samples/MinimalApi.InAction/CoconaSample.MinimalApi.InAction.csproj b/samples/MinimalApi.InAction/CoconaSample.MinimalApi.InAction.csproj
index 50852b37..16c4c1fb 100644
--- a/samples/MinimalApi.InAction/CoconaSample.MinimalApi.InAction.csproj
+++ b/samples/MinimalApi.InAction/CoconaSample.MinimalApi.InAction.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>
diff --git a/samples/MinimalApi.MultipleCommands/CoconaSample.MinimalApi.MultipleCommands.csproj b/samples/MinimalApi.MultipleCommands/CoconaSample.MinimalApi.MultipleCommands.csproj
index b567b99d..4df13f60 100644
--- a/samples/MinimalApi.MultipleCommands/CoconaSample.MinimalApi.MultipleCommands.csproj
+++ b/samples/MinimalApi.MultipleCommands/CoconaSample.MinimalApi.MultipleCommands.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>
diff --git a/samples/MinimalApi.QuickStart/CoconaSample.MinimalApi.QuickStart.csproj b/samples/MinimalApi.QuickStart/CoconaSample.MinimalApi.QuickStart.csproj
index b567b99d..4df13f60 100644
--- a/samples/MinimalApi.QuickStart/CoconaSample.MinimalApi.QuickStart.csproj
+++ b/samples/MinimalApi.QuickStart/CoconaSample.MinimalApi.QuickStart.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>
diff --git a/samples/MinimalApi.SubCommand/CoconaSample.MinimalApi.SubCommand.csproj b/samples/MinimalApi.SubCommand/CoconaSample.MinimalApi.SubCommand.csproj
index 50852b37..16c4c1fb 100644
--- a/samples/MinimalApi.SubCommand/CoconaSample.MinimalApi.SubCommand.csproj
+++ b/samples/MinimalApi.SubCommand/CoconaSample.MinimalApi.SubCommand.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>
diff --git a/src/Cocona.Core/Cocona.Core.csproj b/src/Cocona.Core/Cocona.Core.csproj
index 92b15467..449c26c6 100644
--- a/src/Cocona.Core/Cocona.Core.csproj
+++ b/src/Cocona.Core/Cocona.Core.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net8.0;net6.0;netstandard2.0;netstandard2.1</TargetFrameworks>
+    <TargetFrameworks>net9.0;net8.0;net6.0;netstandard2.0;netstandard2.1</TargetFrameworks>
     <RootNamespace>Cocona</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
@@ -15,7 +15,7 @@
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
-    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
+    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.6.0" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Cocona.Lite/Cocona.Lite.csproj b/src/Cocona.Lite/Cocona.Lite.csproj
index b9a84224..bfc65726 100644
--- a/src/Cocona.Lite/Cocona.Lite.csproj
+++ b/src/Cocona.Lite/Cocona.Lite.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net8.0;net6.0;netstandard2.0;netstandard2.1</TargetFrameworks>
+    <TargetFrameworks>net9.0;net8.0;net6.0;netstandard2.0;netstandard2.1</TargetFrameworks>
     <RootNamespace>Cocona</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
diff --git a/src/Cocona/Cocona.csproj b/src/Cocona/Cocona.csproj
index 4fed0903..f472b39a 100644
--- a/src/Cocona/Cocona.csproj
+++ b/src/Cocona/Cocona.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net8.0;net6.0;netstandard2.0;netstandard2.1</TargetFrameworks>
+    <TargetFrameworks>net9.0;net8.0;net6.0;netstandard2.0;netstandard2.1</TargetFrameworks>
     <ImplicitUsings>true</ImplicitUsings>
     <Nullable>enable</Nullable>
 
@@ -16,10 +16,16 @@
     </PackageReference>
   </ItemGroup>
 
-  <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="8.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Hosting" Version="8.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Logging" Version="8.0.0" />
+  <ItemGroup Condition="('$(TargetFramework)' == 'net9.0')">
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="9.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Hosting" Version="9.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Logging" Version="9.0.0" />
+  </ItemGroup>
+
+  <ItemGroup Condition="('$(TargetFramework)' != 'net9.0')">
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="8.0.1" />
+    <PackageReference Include="Microsoft.Extensions.Hosting" Version="8.0.1" />
+    <PackageReference Include="Microsoft.Extensions.Logging" Version="8.0.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/test/Cocona.Lite.Test/Cocona.Lite.Test.csproj b/test/Cocona.Lite.Test/Cocona.Lite.Test.csproj
index c718d686..c6b0409d 100644
--- a/test/Cocona.Lite.Test/Cocona.Lite.Test.csproj
+++ b/test/Cocona.Lite.Test/Cocona.Lite.Test.csproj
@@ -7,7 +7,7 @@
     <NoWarn>$(NoWarn);1701;1702;CS1998</NoWarn>
     <Nullable>annotations</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <OutputType>Library</OutputType>
   </PropertyGroup>
 
@@ -28,14 +28,14 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="FluentAssertions" Version="6.12.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
-    <PackageReference Include="xunit" Version="2.6.1" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.3">
+    <PackageReference Include="FluentAssertions" Version="6.12.2" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
+    <PackageReference Include="xunit" Version="2.9.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="coverlet.collector" Version="6.0.0">
+    <PackageReference Include="coverlet.collector" Version="6.0.2">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
diff --git a/test/Cocona.Test/Cocona.Test.csproj b/test/Cocona.Test/Cocona.Test.csproj
index 3ba0caac..9fa57ad5 100644
--- a/test/Cocona.Test/Cocona.Test.csproj
+++ b/test/Cocona.Test/Cocona.Test.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>net6.0;net8.0;net9.0</TargetFrameworks>
     <IsPackable>false</IsPackable>
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>..\..\src\Cocona\StrongNameKey.snk</AssemblyOriginatorKeyFile>
@@ -13,14 +13,14 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="FluentAssertions" Version="6.12.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
-    <PackageReference Include="xunit" Version="2.6.1" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.3">
+    <PackageReference Include="FluentAssertions" Version="6.12.2" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
+    <PackageReference Include="xunit" Version="2.9.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="coverlet.collector" Version="6.0.0">
+    <PackageReference Include="coverlet.collector" Version="6.0.2">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>