diff --git a/ScipDotnet.Tests/ScipDotnet.Tests.csproj b/ScipDotnet.Tests/ScipDotnet.Tests.csproj
index e717dde..e957400 100644
--- a/ScipDotnet.Tests/ScipDotnet.Tests.csproj
+++ b/ScipDotnet.Tests/ScipDotnet.Tests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFrameworks>net10.0;net9.0;net8.0;net7.0;net6.0</TargetFrameworks>
+        <TargetFrameworks>net10.0;net9.0;net8.0</TargetFrameworks>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
         <IsPackable>false</IsPackable>
diff --git a/ScipDotnet/IndexCommandHandler.cs b/ScipDotnet/IndexCommandHandler.cs
index 63cdb74..3ffe98e 100644
--- a/ScipDotnet/IndexCommandHandler.cs
+++ b/ScipDotnet/IndexCommandHandler.cs
@@ -116,13 +116,14 @@ private static async Task ScipIndex(IHost host, IndexCommandOptions options)
     }
 
     private static string FixThisProblem(string examplePath) =>
-        "To fix this problem, pass the path of a solution (.sln) or project (.csproj/.vbrpoj) file to the `scip-dotnet index` command. " +
+        "To fix this problem, pass the path of a solution (.sln/.slnx) or project (.csproj/.vbrpoj) file to the `scip-dotnet index` command. " +
         $"For example, run: scip-dotnet index {examplePath}";
 
     private static List<FileInfo> FindSolutionOrProjectFile(FileInfo workingDirectory, ILogger logger)
     {
         var paths = Directory.GetFiles(workingDirectory.FullName).Where(file =>
             string.Equals(Path.GetExtension(file), ".sln", StringComparison.OrdinalIgnoreCase) ||
+            string.Equals(Path.GetExtension(file), ".slnx", StringComparison.OrdinalIgnoreCase) ||
             string.Equals(Path.GetExtension(file), ".csproj", StringComparison.OrdinalIgnoreCase) ||
             string.Equals(Path.GetExtension(file), ".vbproj", StringComparison.OrdinalIgnoreCase)
         ).ToList();
@@ -133,7 +134,7 @@ private static List<FileInfo> FindSolutionOrProjectFile(FileInfo workingDirector
         }
 
         logger.LogError(
-            "No solution (.sln) or .csproj/.vbproj file detected in the working directory '{WorkingDirectory}'. {FixThis}",
+            "No solution (.sln/.slnx) or .csproj/.vbproj file detected in the working directory '{WorkingDirectory}'. {FixThis}",
             workingDirectory.FullName, FixThisProblem("SOLUTION_FILE"));
         return new List<FileInfo>();
     }
diff --git a/ScipDotnet/Program.cs b/ScipDotnet/Program.cs
index ec6ab57..c51c6b8 100644
--- a/ScipDotnet/Program.cs
+++ b/ScipDotnet/Program.cs
@@ -21,7 +21,7 @@ public static async Task<int> Main(string[] args)
     {
         var indexCommand = new Command("index", "Index a solution file")
         {
-            new Argument<FileInfo>("projects", "Path to the .sln (solution) or .csproj/.vbproj file")
+            new Argument<FileInfo>("projects", "Path to the .sln/.slnx (solution) or .csproj/.vbproj file")
                 { Arity = ArgumentArity.ZeroOrMore },
             new Option<string>("--output", () => "index.scip",
                 "Path to the output SCIP index file"),
diff --git a/ScipDotnet/ScipDotnet.csproj b/ScipDotnet/ScipDotnet.csproj
index 6816cb1..020ba6d 100644
--- a/ScipDotnet/ScipDotnet.csproj
+++ b/ScipDotnet/ScipDotnet.csproj
@@ -8,7 +8,7 @@
     <PackageLicenseFile>LICENSE</PackageLicenseFile>
     <PackageReadmeFile>readme.md</PackageReadmeFile>
     <PackageType>DotnetTool</PackageType>
-    <TargetFrameworks>net10.0;net9.0;net8.0;net7.0;net6.0</TargetFrameworks>
+    <TargetFrameworks>net10.0;net9.0;net8.0</TargetFrameworks>
     <PackAsTool>true</PackAsTool>
     <AssemblyName>scip-dotnet</AssemblyName>
     <RepositoryUrl>https://github.com/sourcegraph/scip-dotnet</RepositoryUrl>
@@ -19,14 +19,14 @@
     <None Include="../readme.md" Pack="true" PackagePath="" />
     <PackageReference Include="Google.Protobuf" Version="3.30.0" />
     <PackageReference Include="Microsoft.Build.Locator" Version="1.7.8" />
-    <PackageReference Include="Microsoft.CodeAnalysis" Version="4.4.0" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Features" Version="4.4.0" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.4.0" />
-    <PackageReference Include="Microsoft.CodeAnalysis.Features" Version="4.4.0" />
-    <PackageReference Include="Microsoft.CodeAnalysis.Workspaces.MSBuild" Version="4.4.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis" Version="5.0.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Features" Version="5.0.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="5.0.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.Features" Version="5.0.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.Workspaces.MSBuild" Version="5.0.0" />
     <PackageReference Include="System.CommandLine" Version="2.0.0-beta4.22272.1" />
     <PackageReference Include="System.CommandLine.Hosting" Version="0.4.0-alpha.22272.1" />
-    <PackageReference Include="System.Configuration.ConfigurationManager" Version="7.0.0" />
+    <PackageReference Include="System.Configuration.ConfigurationManager" Version="10.0.1" />
   </ItemGroup>
 
 </Project>
\ No newline at end of file
diff --git a/ScipDotnet/ScipProjectIndexer.cs b/ScipDotnet/ScipProjectIndexer.cs
index 00306f0..d8a5123 100644
--- a/ScipDotnet/ScipProjectIndexer.cs
+++ b/ScipDotnet/ScipProjectIndexer.cs
@@ -20,7 +20,7 @@ public ScipProjectIndexer(ILogger<ScipProjectIndexer> logger) =>
 
     private void Restore(IndexCommandOptions options, FileInfo project)
     {
-        var arguments = project.Extension.Equals(".sln") ? $"restore {project.FullName} /p:EnableWindowsTargeting=true" : "restore /p:EnableWindowsTargeting=true";
+        var arguments = project.Extension.Equals(".sln") || project.Extension.Equals(".slnx") ? $"restore {project.FullName} /p:EnableWindowsTargeting=true" : "restore /p:EnableWindowsTargeting=true";
         if (options.NugetConfigPath != null)
         {
             arguments += $" --configfile \"{options.NugetConfigPath.FullName}\"";