diff --git a/Directory.Packages.props b/Directory.Packages.props
index f02dfec..97100d1 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -15,7 +15,7 @@
     <GlobalPackageReference Include="Roslynator.CodeAnalysis.Analyzers" Version="4.15.0" />
     <GlobalPackageReference Include="Roslynator.CodeFixes" Version="4.15.0" />
     <GlobalPackageReference Include="Roslynator.Refactorings" Version="4.15.0" />
-    <GlobalPackageReference Include="SonarAnalyzer.CSharp" Version="10.29.0.143774" />
+    <GlobalPackageReference Include="SonarAnalyzer.CSharp" Version="10.30.0.144632" />
   </ItemGroup>
   <ItemGroup>
     <PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="5.6.0" />
diff --git a/tests/NetEvolve.Arguments.Analyser.Tests.Unit/AnalyzerVerifier.cs b/tests/NetEvolve.Arguments.Analyser.Tests.Unit/AnalyzerVerifier.cs
index 6c6ec2e..46332a8 100644
--- a/tests/NetEvolve.Arguments.Analyser.Tests.Unit/AnalyzerVerifier.cs
+++ b/tests/NetEvolve.Arguments.Analyser.Tests.Unit/AnalyzerVerifier.cs
@@ -87,7 +87,12 @@ bool useLegacyReferences
 
         await codeFix.RegisterCodeFixesAsync(fixContext).ConfigureAwait(false);
 
-        var operations = await registeredAction!.GetOperationsAsync(CancellationToken.None).ConfigureAwait(false);
+        if (registeredAction is null)
+        {
+            throw new InvalidOperationException("No code fix action was registered.");
+        }
+
+        var operations = await registeredAction.GetOperationsAsync(CancellationToken.None).ConfigureAwait(false);
         var applyChanges = operations.OfType<ApplyChangesOperation>().Single();
         var newDocument = applyChanges.ChangedSolution.GetDocument(document.Id)!;
         var newRoot = await newDocument.GetSyntaxRootAsync().ConfigureAwait(false);
diff --git a/tests/NetEvolve.Arguments.Tests.Unit/ObjectDisposedExceptionPolyfillsTests.cs b/tests/NetEvolve.Arguments.Tests.Unit/ObjectDisposedExceptionPolyfillsTests.cs
index 0e47703..58a0ade 100644
--- a/tests/NetEvolve.Arguments.Tests.Unit/ObjectDisposedExceptionPolyfillsTests.cs
+++ b/tests/NetEvolve.Arguments.Tests.Unit/ObjectDisposedExceptionPolyfillsTests.cs
@@ -49,9 +49,9 @@ public async Task ThrowIf_WithType_WhenConditionIsFalse_DoesNotThrow()
     [Test]
     public async Task ThrowIf_WithNullInstance_WhenConditionIsTrue_ThrowsObjectDisposedException()
     {
-        object? instance = null;
+        object instance = null!;
 
-        void Act() => ObjectDisposedException.ThrowIf(true, instance!);
+        void Act() => ObjectDisposedException.ThrowIf(true, instance);
 
         var exception = Assert.Throws<ObjectDisposedException>(Act);
         _ = await Assert.That(exception.ObjectName).IsEqualTo(string.Empty);
@@ -60,9 +60,9 @@ public async Task ThrowIf_WithNullInstance_WhenConditionIsTrue_ThrowsObjectDispo
     [Test]
     public async Task ThrowIf_WithNullType_WhenConditionIsTrue_ThrowsObjectDisposedException()
     {
-        Type? type = null;
+        Type type = null!;
 
-        void Act() => ObjectDisposedException.ThrowIf(true, type!);
+        void Act() => ObjectDisposedException.ThrowIf(true, type);
 
         var exception = Assert.Throws<ObjectDisposedException>(Act);
         _ = await Assert.That(exception.ObjectName).IsEqualTo(string.Empty);