diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index 8b941069..424eff0a 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -3,9 +3,7 @@
   "image": "mcr.microsoft.com/devcontainers/dotnet:dev-9.0",
   "postCreateCommand": "dotnet restore",
   "features": {
-    "ghcr.io/devcontainers/features/dotnet": {
-      "dotnetRuntimeVersions": "6.0"
-    }
+    "ghcr.io/devcontainers/features/dotnet": {}
   },
   "customizations": {
     "vscode": {
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3c8f4b80..9db07289 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -39,10 +39,6 @@ jobs:
           fetch-depth: 0
       - name: 'Install .NET Core SDK'
         uses: actions/setup-dotnet@3e891b0cb619bf60e2c25674b222b8940e2c1c25 # v4.1.0
-        with:
-          dotnet-version: |
-            6.0.x
-            9.0.x
       - name: 'Dotnet Tool Restore'
         run: dotnet tool restore
         shell: pwsh
diff --git a/samples/AspNetCore/AspNetCore.csproj b/samples/AspNetCore/AspNetCore.csproj
index 122b9201..8b83cad1 100644
--- a/samples/AspNetCore/AspNetCore.csproj
+++ b/samples/AspNetCore/AspNetCore.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <NoWarn>$(NoWarn);CA1848;IDE0021;IDE0053;VSTHRD111</NoWarn>
   </PropertyGroup>
diff --git a/samples/AzureFunctions/AzureFunctions.csproj b/samples/AzureFunctions/AzureFunctions.csproj
index f1089a7c..431f7f05 100644
--- a/samples/AzureFunctions/AzureFunctions.csproj
+++ b/samples/AzureFunctions/AzureFunctions.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <AzureFunctionsVersion>V4</AzureFunctionsVersion>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <NoWarn>$(NoWarn);CA1848;IDE0021;IDE0053;VSTHRD111</NoWarn>
diff --git a/test/Octokit.Webhooks.AzureFunctions.Test/Octokit.Webhooks.AzureFunctions.Test.csproj b/test/Octokit.Webhooks.AzureFunctions.Test/Octokit.Webhooks.AzureFunctions.Test.csproj
index d33200a1..5a6013c1 100644
--- a/test/Octokit.Webhooks.AzureFunctions.Test/Octokit.Webhooks.AzureFunctions.Test.csproj
+++ b/test/Octokit.Webhooks.AzureFunctions.Test/Octokit.Webhooks.AzureFunctions.Test.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup Label="Build">
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup Label="Project References">
diff --git a/test/Octokit.Webhooks.Test/Octokit.Webhooks.Test.csproj b/test/Octokit.Webhooks.Test/Octokit.Webhooks.Test.csproj
index 35ba798e..8d90b292 100644
--- a/test/Octokit.Webhooks.Test/Octokit.Webhooks.Test.csproj
+++ b/test/Octokit.Webhooks.Test/Octokit.Webhooks.Test.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup Label="Build">
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup Label="Project References">
diff --git a/test/Octokit.Webhooks.TestUtils/Octokit.Webhooks.TestUtils.csproj b/test/Octokit.Webhooks.TestUtils/Octokit.Webhooks.TestUtils.csproj
index a38ae2fa..d4a4afdc 100644
--- a/test/Octokit.Webhooks.TestUtils/Octokit.Webhooks.TestUtils.csproj
+++ b/test/Octokit.Webhooks.TestUtils/Octokit.Webhooks.TestUtils.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup Label="Build">
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
   </PropertyGroup>
 
 </Project>