diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 975a509..74d46cb 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -3,11 +3,11 @@ name: release
 on:
   push:
     tags:
-      - 'v*'
+      - "v*"
   workflow_dispatch:
     inputs:
       version:
-        description: 'Version/tag to create (e.g. v1.2.3)'
+        description: "Version/tag to create (e.g. v1.2.3)"
         required: false
         type: string
 
@@ -16,16 +16,16 @@ permissions:
 
 jobs:
   build:
-    runs-on: windows-2025
+    runs-on: windows-2025-vs2026
     steps:
       - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
-      
+
       - uses: actions/setup-dotnet@9a946fdbd5fb07b82b2f5a4466058b876ab72bb2 # v5.3.0
         with:
           dotnet-version: "10.x"
-          
+
       - uses: nuget/setup-nuget@fd55a6f3b34392fa83fde1454582407d8c714123 # 4.0.0
-      
+
       - uses: microsoft/setup-msbuild@30375c66a4eea26614e0d39710365f22f8b0af57 # 3.0.0
         with:
           msbuild-architecture: x64
@@ -109,16 +109,16 @@ jobs:
       - name: Stage Release Assets
         run: |
           New-Item -ItemType Directory -Force -Path release-staging
-          
+
           # Copy application binary (single file, self-contained, with .NET version)
           Copy-Item publish/app/LibreHardwareMonitor.Windows.WinUI.exe release-staging/LibreHardwareMonitor.Windows.WinUI-net10.0.exe
-          
+
           # Copy library DLL (net10.0 build)
           Copy-Item bin/Release/x64/net10.0/LibreHardwareMonitorLib.dll release-staging/LibreHardwareMonitorLib.dll
-          
+
           # Create source code ZIP
           git archive --format=zip --output release-staging/LibreHardwareMonitor-source.zip HEAD
-          
+
           # Generate SHA256 checksums
           $sha256 = [System.Security.Cryptography.SHA256]::Create()
           Get-ChildItem release-staging | Where-Object { $_.Name -ne "SHA256SUMS.txt" } | ForEach-Object {
@@ -128,7 +128,7 @@ jobs:
               $hash = [System.BitConverter]::ToString($hashBytes).Replace("-", "").ToLower()
               "{0}  {1}" -f $hash, $_.Name
           } | Set-Content release-staging/SHA256SUMS.txt
-          
+
           # Log hashes for visibility
           Get-Content release-staging/SHA256SUMS.txt
 
diff --git a/.github/workflows/status-checks.yml b/.github/workflows/status-checks.yml
index 019be1f..8fc3e3a 100644
--- a/.github/workflows/status-checks.yml
+++ b/.github/workflows/status-checks.yml
@@ -7,7 +7,7 @@ on:
 
 jobs:
   build:
-    runs-on: windows-2025
+    runs-on: windows-2025-vs2026
     steps:
       - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
       - uses: actions/setup-dotnet@9a946fdbd5fb07b82b2f5a4466058b876ab72bb2 # v5.3.0
diff --git a/LibreHardwareMonitor.Windows.WinUI.Tests/Services/AppSettingsTests.cs b/LibreHardwareMonitor.Windows.WinUI.Tests/Services/AppSettingsTests.cs
index e77489f..1953206 100644
--- a/LibreHardwareMonitor.Windows.WinUI.Tests/Services/AppSettingsTests.cs
+++ b/LibreHardwareMonitor.Windows.WinUI.Tests/Services/AppSettingsTests.cs
@@ -18,7 +18,7 @@ public class AppSettingsTests : IDisposable
         
         // Use reflection to instantiate AppSettings with custom filename
         var ctor = typeof(AppSettings).GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance, null, new[] { typeof(string) }, null);
-        _settings = (AppSettings)ctor.Invoke(new object[] { _tempFile });
+        _settings = (AppSettings)ctor!.Invoke(new object[] { _tempFile });
     }
 
     public void Dispose()
@@ -109,7 +109,7 @@ public class AppSettingsTests : IDisposable
 
         // Create new instance pointing to same file
         var ctor = typeof(AppSettings).GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance, null, new[] { typeof(string) }, null);
-        var loadedSettings = (AppSettings)ctor.Invoke(new object[] { _tempFile });
+        var loadedSettings = (AppSettings)ctor!.Invoke(new object[] { _tempFile });
         
         loadedSettings.Load();
 
diff --git a/LibreHardwareMonitor.Windows.WinUI.Tests/Utilities/SensorFormatterTests.cs b/LibreHardwareMonitor.Windows.WinUI.Tests/Utilities/SensorFormatterTests.cs
index ca9dc74..81ca386 100644
--- a/LibreHardwareMonitor.Windows.WinUI.Tests/Utilities/SensorFormatterTests.cs
+++ b/LibreHardwareMonitor.Windows.WinUI.Tests/Utilities/SensorFormatterTests.cs
@@ -221,6 +221,7 @@ public class SensorFormatterTests
         mockSensor.Setup(s => s.SensorType).Returns(SensorType.Temperature);
 
         var result = SensorFormatter.GetPlotValue(mockSensor.Object, TemperatureUnit.Fahrenheit);
+        Assert.NotNull(result);
         Assert.Equal(77.9, result.Value, 1);
     }
 
@@ -243,6 +244,7 @@ public class SensorFormatterTests
 
         var result = SensorFormatter.GetPlotValue(mockSensor.Object, 25.5f, TemperatureUnit.Fahrenheit);
 
+        Assert.NotNull(result);
         Assert.Equal(77.9, result.Value, 1);
     }
 
diff --git a/LibreHardwareMonitor.Windows.WinUI.Tests/ViewModels/SimpleViewModelsTests.cs b/LibreHardwareMonitor.Windows.WinUI.Tests/ViewModels/SimpleViewModelsTests.cs
index 57afbdc..d88101e 100644
--- a/LibreHardwareMonitor.Windows.WinUI.Tests/ViewModels/SimpleViewModelsTests.cs
+++ b/LibreHardwareMonitor.Windows.WinUI.Tests/ViewModels/SimpleViewModelsTests.cs
@@ -11,7 +11,7 @@ public class SimpleViewModelsTests
 {
     private class TestViewModel : ViewModelBase
     {
-        private string _testProperty;
+        private string _testProperty = string.Empty;
         public string TestProperty
         {
             get => _testProperty;
@@ -28,7 +28,7 @@ public class SimpleViewModelsTests
     public void ViewModelBase_SetProperty_ChangesValueAndRaisesEvent()
     {
         var vm = new TestViewModel();
-        string changedProperty = null;
+        string? changedProperty = null;
         vm.PropertyChanged += (sender, args) => changedProperty = args.PropertyName;
 
         // Change value
@@ -57,7 +57,7 @@ public class SimpleViewModelsTests
     public void ViewModelBase_OnPropertyChanged_RaisesEvent()
     {
         var vm = new TestViewModel();
-        string changedProperty = null;
+        string? changedProperty = null;
         vm.PropertyChanged += (sender, args) => changedProperty = args.PropertyName;
 
         vm.TriggerPropertyChanged("CustomProperty");