diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index fd2d8b3dc9..f3c90a08ef 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -261,6 +261,9 @@ jobs:
         working-directory: src/CommandLine
     steps:
       - uses: actions/checkout@v4
+      - uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: 9.0.101
       - run: dotnet restore
       - run: dotnet build --no-restore
       - run: dotnet pack --no-build
diff --git a/ChangeLog.md b/ChangeLog.md
index e6ab73d0e2..c919aedacd 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -7,9 +7,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- [CLI] Add support for .NET 9 ([PR](https://github.com/dotnet/roslynator/pull/1605))
+
 ### Fixed
 
 - Fix refactoring 'Change accessibility' ([RR0186](https://josefpihrt.github.io/docs/roslynator/refactorings/RR0186)) ([PR](https://github.com/dotnet/roslynator/pull/1599))
+- Fix analyzer [RCS1264](https://josefpihrt.github.io/docs/roslynator/analyzers/RCS1264) ([PR](https://github.com/dotnet/roslynator/pull/1604))
 
 ### Changed
 
diff --git a/src/Analyzers/CSharp/Analysis/UseVarOrExplicitTypeAnalyzer.cs b/src/Analyzers/CSharp/Analysis/UseVarOrExplicitTypeAnalyzer.cs
index 39dac4c8a9..8f457167ce 100644
--- a/src/Analyzers/CSharp/Analysis/UseVarOrExplicitTypeAnalyzer.cs
+++ b/src/Analyzers/CSharp/Analysis/UseVarOrExplicitTypeAnalyzer.cs
@@ -48,7 +48,7 @@ private static void AnalyzeVariableDeclaration(SyntaxNodeAnalysisContext context
         }
         else if (style == TypeStyle.Explicit)
         {
-            if (CSharpTypeAnalysis.IsImplicitThatCanBeExplicit(variableDeclaration, context.SemanticModel, TypeAppearance.Obvious, context.CancellationToken))
+            if (CSharpTypeAnalysis.IsImplicitThatCanBeExplicit(variableDeclaration, context.SemanticModel, context.CancellationToken))
                 ReportImplicitToExplicit(context, variableDeclaration.Type);
         }
         else if (style == TypeStyle.ImplicitWhenTypeIsObvious)
diff --git a/src/CommandLine.DocumentationGenerator/CommandLine.DocumentationGenerator.csproj b/src/CommandLine.DocumentationGenerator/CommandLine.DocumentationGenerator.csproj
index 8cf58f8bf1..642d1aecea 100644
--- a/src/CommandLine.DocumentationGenerator/CommandLine.DocumentationGenerator.csproj
+++ b/src/CommandLine.DocumentationGenerator/CommandLine.DocumentationGenerator.csproj
@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(RoslynatorDotNetCli)' == true">
-    <TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>net7.0;net8.0;net9.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(RoslynatorCommandLine)' == true">
diff --git a/src/CommandLine/CommandLine.csproj b/src/CommandLine/CommandLine.csproj
index de80181f19..cc3354cb0a 100644
--- a/src/CommandLine/CommandLine.csproj
+++ b/src/CommandLine/CommandLine.csproj
@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(RoslynatorDotNetCli)' == true">
-    <TargetFrameworks>net7.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>net7.0;net8.0;net9.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(RoslynatorCommandLine)' == true">
diff --git a/src/CommandLine/DelegateFactory.cs b/src/CommandLine/DelegateFactory.cs
index f21f5a86a3..df75f0741a 100644
--- a/src/CommandLine/DelegateFactory.cs
+++ b/src/CommandLine/DelegateFactory.cs
@@ -150,7 +150,11 @@ private static TDelegate CreateDelegate<TDelegate>(
 
         if (method.IsStatic)
         {
+#if NETFRAMEWORK
             return (TDelegate)method.CreateDelegate(typeof(TDelegate));
+#else
+            return method.CreateDelegate<TDelegate>();
+#endif
         }
         else
         {
diff --git a/src/CommandLine/docs/NetCore/NuGetReadme.md b/src/CommandLine/docs/NetCore/NuGetReadme.md
index 727601c207..23936670be 100644
--- a/src/CommandLine/docs/NetCore/NuGetReadme.md
+++ b/src/CommandLine/docs/NetCore/NuGetReadme.md
@@ -4,7 +4,7 @@
 
 ## Requirements
 
-.NET Core SDK 6.0, 7.0 or 8.0.
+.NET Core SDK 7, 8 or 9.
 
 ## Installation
 
diff --git a/src/Documentation/SymbolDefinitionDisplay.cs b/src/Documentation/SymbolDefinitionDisplay.cs
index ab586ef1e8..1e7411f759 100644
--- a/src/Documentation/SymbolDefinitionDisplay.cs
+++ b/src/Documentation/SymbolDefinitionDisplay.cs
@@ -955,7 +955,7 @@ private static void FormatParameters(
 
     private static int FindParameterListStart(
         ISymbol symbol,
-        IList<SymbolDisplayPart> parts)
+        ImmutableArray<SymbolDisplayPart>.Builder parts)
     {
         int parenthesesDepth = 0;
         int bracesDepth = 0;
diff --git a/src/Refactorings/CSharp/Refactorings/SortMemberDeclarations/SortMemberDeclarationsRefactoring.cs b/src/Refactorings/CSharp/Refactorings/SortMemberDeclarations/SortMemberDeclarationsRefactoring.cs
index 6a34cb20ef..62d301f652 100644
--- a/src/Refactorings/CSharp/Refactorings/SortMemberDeclarations/SortMemberDeclarationsRefactoring.cs
+++ b/src/Refactorings/CSharp/Refactorings/SortMemberDeclarations/SortMemberDeclarationsRefactoring.cs
@@ -109,7 +109,7 @@ private static Task<Document> RefactorAsync(
         return document.ReplaceMembersAsync(info, newMembers, cancellationToken);
     }
 
-    private static SyntaxKind GetSingleKindOrDefault(IReadOnlyList<MemberDeclarationSyntax> members)
+    private static SyntaxKind GetSingleKindOrDefault(MemberDeclarationListSelection members)
     {
         SyntaxKind kind = members[0].Kind();
 
diff --git a/src/Tests/Analyzers.Tests/RCS1264UseVarOrExplicitTypeTests2.cs b/src/Tests/Analyzers.Tests/RCS1264UseVarOrExplicitTypeTests2.cs
index fbd34abda8..3c10ddb2b7 100644
--- a/src/Tests/Analyzers.Tests/RCS1264UseVarOrExplicitTypeTests2.cs
+++ b/src/Tests/Analyzers.Tests/RCS1264UseVarOrExplicitTypeTests2.cs
@@ -162,6 +162,36 @@ void M()
 ", options: Options.AddConfigOption(ConfigOptionKeys.UseVar, ConfigOptionValues.UseVar_Never));
     }
 
+    [Fact, Trait(Traits.Analyzer, DiagnosticIdentifiers.UseVarOrExplicitType)]
+    public async Task Test_NotObviousExpression()
+    {
+        await VerifyDiagnosticAndFixAsync(@"
+using System.Threading.Tasks;
+using System.Collections.Generic;
+
+class C
+{
+    void M()
+    {
+        [|var|] x1 = string.Empty;
+        [|var|] x2 = Task.FromResult(string.Empty);
+    }
+}
+", @"
+using System.Threading.Tasks;
+using System.Collections.Generic;
+
+class C
+{
+    void M()
+    {
+        string x1 = string.Empty;
+        Task<string> x2 = Task.FromResult(string.Empty);
+    }
+}
+", options: Options.AddConfigOption(ConfigOptionKeys.UseVar, ConfigOptionValues.UseVar_Never));
+    }
+
     [Fact, Trait(Traits.Analyzer, DiagnosticIdentifiers.UseVarOrExplicitType)]
     public async Task TestNoDiagnostic_ForEach_DeclarationExpression()
     {
diff --git a/src/Tools/CodeGeneration/Markdown/MarkdownGenerator.cs b/src/Tools/CodeGeneration/Markdown/MarkdownGenerator.cs
index 499ba4a85e..4cf346d3ef 100644
--- a/src/Tools/CodeGeneration/Markdown/MarkdownGenerator.cs
+++ b/src/Tools/CodeGeneration/Markdown/MarkdownGenerator.cs
@@ -158,7 +158,7 @@ public static string CreateAnalyzerMarkdown(AnalyzerMetadata analyzer, Immutable
 
         static IEnumerable<MElement> CreateSamples(AnalyzerMetadata analyzer)
         {
-            IReadOnlyList<SampleMetadata> samples = analyzer.Samples;
+            List<SampleMetadata> samples = analyzer.Samples;
             LegacyAnalyzerOptionKind kind = analyzer.Kind;
 
             if (samples.Count > 0)