feO2x · feO2x · Jul 13, 2026 · Jul 13, 2026 · Jul 13, 2026 · Jul 13, 2026
diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
@@ -8,7 +8,7 @@ on:
       - 'tests/**'
       - 'benchmarks/**'
       - 'tools/**'
-      - '*.sln'
+      - '*.slnx'
       - '*.props'
       - 'global.json'
       - '.github/workflows/build-and-test.yml'
@@ -19,7 +19,7 @@ on:
       - 'tests/**'
       - 'benchmarks/**'
       - 'tools/**'
-      - '*.sln'
+      - '*.slnx'
       - '*.props'
       - 'global.json'
       - '.github/workflows/build-and-test.yml'
@@ -34,10 +34,10 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 8.0.x
+        global-json-file: global.json
     - name: Restore dependencies
-      run: dotnet restore ./Light.GuardClauses.sln
+      run: dotnet restore ./Light.GuardClauses.slnx
     - name: Build
-      run: dotnet build ./Light.GuardClauses.sln -c Release --no-restore
+      run: dotnet build ./Light.GuardClauses.slnx -c Release --no-restore
     - name: Test
-      run: dotnet test ./Light.GuardClauses.sln -c Release --no-build --verbosity normal
+      run: dotnet test ./Light.GuardClauses.slnx -c Release --no-build --verbosity normal
diff --git a/.github/workflows/release-on-nuget.yml b/.github/workflows/release-on-nuget.yml
@@ -4,11 +4,6 @@ on:
   release:
     types: [published]
   workflow_dispatch:
-    inputs:
-      dotnetVersion:
-        description: "The version of .NET to use"
-        required: false
-        default: "8.0.x"
 
 jobs:
   release-to-nuget:
@@ -20,7 +15,7 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: ${{ github.event.inputs.dotnetVersion || '8.0.x' }}
+          global-json-file: global.json
       - name: Prepare SNK file
         env:
           LIGHT_GUARDCLAUSES_SNK: ${{ secrets.LIGHT_GUARDCLAUSES_SNK }}

diff --git a/Directory.Build.props b/Directory.Build.props
@@ -1,7 +1,7 @@
 <Project>
   <PropertyGroup>
     <Version>14.0.0</Version>
-    <LangVersion>12</LangVersion>
+    <LangVersion>14</LangVersion>
     <Authors>Kenny Pflug</Authors>
     <Company>Kenny Pflug</Company>
     <Copyright>Copyright © Kenny Pflug 2016, 2025</Copyright>

diff --git a/Directory.Packages.props b/Directory.Packages.props
@@ -3,32 +3,24 @@
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
     <CentralPackageTransitivePinningEnabled>false</CentralPackageTransitivePinningEnabled>
   </PropertyGroup>
+  <!--
+    Roslyn packages are pinned to match the compiler shipped with the SDK selected in global.json.
+    Light.GuardClauses.InternalRoslynAnalyzers is compiler-loaded and must not reference a newer Microsoft.CodeAnalysis than the SDK compiler.
+    Keep Microsoft.CodeAnalysis.* aligned so analyzers, code fixes, and source-export tooling use one Roslyn line.
+  -->
   <ItemGroup>
     <PackageVersion Include="BenchmarkDotNet" Version="0.15.6" />
     <PackageVersion Include="FluentAssertions" Version="[7.2.0]" />
-    <PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="3.11.0" />
-    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.13.0" />
-    <PackageVersion Include="Microsoft.Extensions.Configuration.Binder" Version="10.0.0" />
-    <PackageVersion Include="Microsoft.Extensions.Configuration.CommandLine" Version="10.0.0" />
-    <PackageVersion Include="Microsoft.Extensions.Configuration.Json" Version="10.0.0" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="5.6.0" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="5.6.0" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="5.6.0" />
+    <PackageVersion Include="Microsoft.Extensions.Configuration.Binder" Version="10.0.9" />
+    <PackageVersion Include="Microsoft.Extensions.Configuration.CommandLine" Version="10.0.9" />
+    <PackageVersion Include="Microsoft.Extensions.Configuration.Json" Version="10.0.9" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
-    <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="8.0.0" />
     <PackageVersion Include="Nullable" Version="1.3.1" />
-    <PackageVersion Include="System.Collections.Immutable" Version="10.0.0" />
+    <PackageVersion Include="System.Collections.Immutable" Version="10.0.9" />
     <PackageVersion Include="xunit" Version="2.9.3" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
   </ItemGroup>
-  <!--
-    The compiler-loaded analyzer assembly (Light.GuardClauses.InternalRoslynAnalyzers) and its
-    matching CodeFixes assembly must be built against Roslyn 4.11.0 to match the Roslyn version
-    shipped with the pinned .NET SDK 8.0.400 (see global.json). A compiler-loaded extension must
-    not reference a newer Microsoft.CodeAnalysis than the SDK's compiler. The analyzer is the only
-    consumer of Microsoft.CodeAnalysis.CSharp, so it is pinned centrally here. The CodeFixes project
-    overrides Microsoft.CodeAnalysis.CSharp.Workspaces to 4.11.0 via VersionOverride so its Roslyn
-    version matches the analyzer; the central Workspaces version stays 4.13.0 for the source-export
-    tooling, which runs on the installed SDK and is not a compiler extension.
-  -->
-  <ItemGroup>
-    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.11.0" />
-  </ItemGroup>
 </Project>
diff --git a/Light.GuardClauses.SingleFile.cs b/Light.GuardClauses.SingleFile.cs
@@ -5564,7 +5564,7 @@ public static T MustNotBeDefault<T>([NotNull, ValidatedNotNull] this T parameter
                 return parameter;
             }
 
-            if (EqualityComparer<T>.Default.Equals(parameter, default !))
+            if (EqualityComparer<T>.Default.Equals(parameter, default!))
             {
                 Throw.ArgumentDefault(parameterName, message);
             }
@@ -5595,7 +5595,7 @@ public static T MustNotBeDefault<T>([NotNull, ValidatedNotNull] this T parameter
                 return parameter;
             }
 
-            if (EqualityComparer<T>.Default.Equals(parameter, default !))
+            if (EqualityComparer<T>.Default.Equals(parameter, default!))
             {
                 Throw.CustomException(exceptionFactory);
             }

diff --git a/Light.GuardClauses.sln b/Light.GuardClauses.sln
diff --git a/Light.GuardClauses.slnx b/Light.GuardClauses.slnx
@@ -0,0 +1,34 @@
+<Solution>
+  <Folder Name="/benchmarks/">
+    <Project Path="benchmarks/Light.GuardClauses.Performance/Light.GuardClauses.Performance.csproj" />
+  </Folder>
+  <Folder Name="/Solution Items/">
+    <File Path=".gitignore" />
+    <File Path="AGENTS.md" />
+    <File Path="CLAUDE.md" />
+    <File Path="CONTRIBUTING.md" />
+    <File Path="Directory.Build.props" />
+    <File Path="Directory.Packages.props" />
+    <File Path="global.json" />
+    <File Path="LICENSE" />
+    <File Path="Light.GuardClauses.sln.DotSettings" />
+    <File Path="README.md" />
+  </Folder>
+  <Folder Name="/src/">
+    <Project Path="src/Light.GuardClauses/Light.GuardClauses.csproj" />
+  </Folder>
+  <Folder Name="/tests/">
+    <Project Path="tests/Light.GuardClauses.InternalRoslynAnalyzers.Tests/Light.GuardClauses.InternalRoslynAnalyzers.Tests.csproj" />
+    <Project Path="tests/Light.GuardClauses.SourceCodeTransformation.Tests/Light.GuardClauses.SourceCodeTransformation.Tests.csproj" />
+    <Project Path="tests/Light.GuardClauses.Tests/Light.GuardClauses.Tests.csproj" />
+  </Folder>
+  <Folder Name="/tools/" />
+  <Folder Name="/tools/analyzers/">
+    <Project Path="tools/analyzers/Light.GuardClauses.InternalRoslynAnalyzers.CodeFixes/Light.GuardClauses.InternalRoslynAnalyzers.CodeFixes.csproj" />
+    <Project Path="tools/analyzers/Light.GuardClauses.InternalRoslynAnalyzers/Light.GuardClauses.InternalRoslynAnalyzers.csproj" />
+  </Folder>
+  <Folder Name="/tools/source-export/">
+    <Project Path="tools/source-export/Light.GuardClauses.SourceCodeTransformation/Light.GuardClauses.SourceCodeTransformation.csproj" />
+    <Project Path="tools/source-export/Light.GuardClauses.SourceValidation/Light.GuardClauses.SourceValidation.csproj" />
+  </Folder>
+</Solution>
diff --git a/README.md b/README.md
@@ -94,7 +94,7 @@ Every assertion is well-documented - explore them using IntelliSense or check ou
 
 ## Light.GuardClauses is optimized
 
-Since version 4, **Light.GuardClauses** is optimized for performance (measured in .NET 4.8 and .NET 8). With the incredible help of [@redknightlois](https://github.com/redknightlois) and the awesome tool [BenchmarkDotNet](https://github.com/dotnet/BenchmarkDotNet), most assertions are as fast as your imperative code would be.
+Since version 4, **Light.GuardClauses** is optimized for performance (measured in .NET Framework 4.8 and .NET 10). With the incredible help of [@redknightlois](https://github.com/redknightlois) and the awesome tool [BenchmarkDotNet](https://github.com/dotnet/BenchmarkDotNet), most assertions are as fast as your imperative code would be.
 
 **Light.GuardClauses** has support for [.NET analyzers / FxCopAnalyzers](https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/overview) with the `ValidatedNotNullAttribute` and the `NotNullAttribute`. Analyzers will know when an assertion validated that a parameters is not null and consequently, CA1062 will not be raised.
 
@@ -109,8 +109,8 @@ And, of course, the functional correctness of **Light.GuardClauses** is covered
 ## Supported Platforms
 
 **Light.GuardClauses** is built
-against [.NET 8, .NET Standard 2.0 and 2.1](https://docs.microsoft.com/en-us/dotnet/standard/net-standard), thus it can
-be used with a large variety of target frameworks like .NET 5 or newer .NET Framework 4.6.1 or newer, Unity, Mono, or
+against [.NET 10, .NET Standard 2.0 and 2.1](https://learn.microsoft.com/dotnet/standard/net-standard), thus it can
+be used with a large variety of target frameworks like .NET 5 or newer, .NET Framework 4.6.1 or newer, Unity, Mono, or
 UWP.
 
 ## How to Install