diff --git a/StyleCop.Analyzers/StyleCop.Analyzers.Test/Verifiers/StyleCopCodeFixVerifier`2.cs b/StyleCop.Analyzers/StyleCop.Analyzers.Test/Verifiers/StyleCopCodeFixVerifier`2.cs
index 59949aecb..1876c56b3 100644
--- a/StyleCop.Analyzers/StyleCop.Analyzers.Test/Verifiers/StyleCopCodeFixVerifier`2.cs
+++ b/StyleCop.Analyzers/StyleCop.Analyzers.Test/Verifiers/StyleCopCodeFixVerifier`2.cs
@@ -22,6 +22,7 @@ namespace StyleCop.Analyzers.Test.Verifiers
     using Microsoft.CodeAnalysis.Testing;
     using Microsoft.CodeAnalysis.Testing.Verifiers;
     using Microsoft.CodeAnalysis.Text;
+    using StyleCop.Analyzers.Lightup;
     using StyleCop.Analyzers.Settings.ObjectModel;
     using StyleCop.Analyzers.Test.Helpers;
     using Xunit;
@@ -112,7 +113,7 @@ public CSharpTest()
             public CSharpTest(LanguageVersion? languageVersion)
             {
                 this.ReferenceAssemblies = GenericAnalyzerTest.ReferenceAssemblies;
-                this.LanguageVersion = languageVersion;
+                this.LanguageVersion = languageVersion ?? this.GetDefaultLanguageVersion();
 
                 this.OptionsTransforms.Add(options =>
                     options
@@ -274,6 +275,19 @@ protected override IEnumerable<CodeFixProvider> GetCodeFixProviders()
                 Assert.NotSame(WellKnownFixAllProviders.BatchFixer, codeFixProvider.GetFixAllProvider());
                 return new[] { codeFixProvider };
             }
+
+            // TODO: Remove when c# 11 is a supported language version
+            private LanguageVersion? GetDefaultLanguageVersion()
+            {
+                // Temporary fix since c# 11 is not yet the default language version
+                // in the c# 11 test project.
+                if (LightupHelpers.SupportsCSharp11)
+                {
+                    return LanguageVersionEx.Preview;
+                }
+
+                return null;
+            }
         }
     }
 }
diff --git a/StyleCop.Analyzers/StyleCop.Analyzers.Test/Verifiers/StyleCopDiagnosticVerifier`1.cs b/StyleCop.Analyzers/StyleCop.Analyzers.Test/Verifiers/StyleCopDiagnosticVerifier`1.cs
index 379ace4be..e1f33e2dc 100644
--- a/StyleCop.Analyzers/StyleCop.Analyzers.Test/Verifiers/StyleCopDiagnosticVerifier`1.cs
+++ b/StyleCop.Analyzers/StyleCop.Analyzers.Test/Verifiers/StyleCopDiagnosticVerifier`1.cs
@@ -13,6 +13,7 @@ namespace StyleCop.Analyzers.Test.Verifiers
     using Microsoft.CodeAnalysis.Diagnostics;
     using Microsoft.CodeAnalysis.Testing;
     using Microsoft.CodeAnalysis.Testing.Verifiers;
+    using StyleCop.Analyzers.Lightup;
 
     internal static class StyleCopDiagnosticVerifier<TAnalyzer>
         where TAnalyzer : DiagnosticAnalyzer, new()
@@ -64,7 +65,7 @@ public CSharpTest()
 
             public CSharpTest(LanguageVersion? languageVersion)
             {
-                this.LanguageVersion = languageVersion;
+                this.LanguageVersion = languageVersion ?? this.GetDefaultLanguageVersion();
             }
 
             private LanguageVersion? LanguageVersion { get; }
@@ -79,6 +80,19 @@ protected override ParseOptions CreateParseOptions()
 
                 return parseOptions;
             }
+
+            // TODO: Remove when c# 11 is a supported language version
+            private LanguageVersion? GetDefaultLanguageVersion()
+            {
+                // Temporary fix since c# 11 is not yet the default language version
+                // in the c# 11 test project.
+                if (LightupHelpers.SupportsCSharp11)
+                {
+                    return LanguageVersionEx.Preview;
+                }
+
+                return null;
+            }
         }
     }
 }
diff --git a/StyleCop.Analyzers/StyleCop.Analyzers/Lightup/LightupHelpers.cs b/StyleCop.Analyzers/StyleCop.Analyzers/Lightup/LightupHelpers.cs
index 20fa401d6..420992807 100644
--- a/StyleCop.Analyzers/StyleCop.Analyzers/Lightup/LightupHelpers.cs
+++ b/StyleCop.Analyzers/StyleCop.Analyzers/Lightup/LightupHelpers.cs
@@ -46,6 +46,11 @@ internal static class LightupHelpers
         public static bool SupportsCSharp10 { get; }
             = Enum.GetNames(typeof(LanguageVersion)).Contains(nameof(LanguageVersionEx.CSharp10));
 
+        // NOTE: Since c# is only in preview yet, we need to check something else than available language versions. Picked a new syntax kind temporarily.
+        // TODO: Update when c# 11 is available as a language version.
+        public static bool SupportsCSharp11 { get; }
+            = Enum.GetNames(typeof(SyntaxKind)).Contains(nameof(SyntaxKindEx.SlicePattern));
+
         public static bool SupportsIOperation => SupportsCSharp73;
 
         internal static bool CanWrapObject(object obj, Type underlyingType)
diff --git a/StyleCop.Analyzers/StyleCop.Analyzers/Lightup/SyntaxKindEx.cs b/StyleCop.Analyzers/StyleCop.Analyzers/Lightup/SyntaxKindEx.cs
index be1f8ec3d..894c79ec3 100644
--- a/StyleCop.Analyzers/StyleCop.Analyzers/Lightup/SyntaxKindEx.cs
+++ b/StyleCop.Analyzers/StyleCop.Analyzers/Lightup/SyntaxKindEx.cs
@@ -48,6 +48,8 @@ internal static class SyntaxKindEx
         public const SyntaxKind SwitchExpressionArm = (SyntaxKind)9026;
         public const SyntaxKind VarPattern = (SyntaxKind)9027;
         public const SyntaxKind ParenthesizedPattern = (SyntaxKind)9028;
+        public const SyntaxKind SlicePattern = (SyntaxKind)9034;
+        public const SyntaxKind ListPattern = (SyntaxKind)9035;
         public const SyntaxKind DeclarationExpression = (SyntaxKind)9040;
         public const SyntaxKind RefExpression = (SyntaxKind)9050;
         public const SyntaxKind RefType = (SyntaxKind)9051;