diff --git a/src/Directory.Build.props b/src/Directory.Build.props
index 14f927b..da6b03e 100644
--- a/src/Directory.Build.props
+++ b/src/Directory.Build.props
@@ -1,7 +1,7 @@
 <Project>
   <PropertyGroup>
     <Deterministic>true</Deterministic>
-    <LangVersion>11.0</LangVersion>
+    <LangVersion>12.0</LangVersion>
     <Nullable>enable</Nullable>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <EnableNETAnalyzers>true</EnableNETAnalyzers>
diff --git a/src/Directory.Packages.props b/src/Directory.Packages.props
index 1abc525..ae44162 100644
--- a/src/Directory.Packages.props
+++ b/src/Directory.Packages.props
@@ -20,8 +20,8 @@
     <PackageVersion Include="NuGet.Packaging" Version="6.11.1" />
     <PackageVersion Include="Polly" Version="8.6.4" />
     <PackageVersion Include="Polly.Extensions.Http" Version="3.0.0" />
-    <PackageVersion Include="System.CommandLine" Version="2.0.0-beta4.22272.1" />
-    <PackageVersion Include="System.CommandLine.Hosting" Version="0.4.0-alpha.22272.1" />
+    <PackageVersion Include="System.CommandLine" Version="2.0.3" />
+    <PackageVersion Include="System.CommandLine.Hosting" Version="0.4.0-alpha.25306.1" />
     <PackageVersion Include="System.Formats.Asn1" Version="6.0.1" />
     <PackageVersion Include="System.Net.Http.Json" Version="8.0.1" />
     <PackageVersion Include="System.Text.Json" Version="8.0.5" />
diff --git a/src/GenerateNotice/Program.cs b/src/GenerateNotice/Program.cs
index 123e3ba..3504315 100644
--- a/src/GenerateNotice/Program.cs
+++ b/src/GenerateNotice/Program.cs
@@ -32,55 +32,64 @@ public static async Task<int> Main(string[] args)
 
             var rootCommand = new RootCommand("Third-party notice generator");
 
-            var assetFilesOption = new Option<List<string>>("--asset-files", "One or more paths to project.assets.json file(s).")
+            var assetFilesOption = new Option<List<string>>("--asset-files")
             {
+                Description = "One or more paths to project.assets.json file(s).",
                 Arity = ArgumentArity.ZeroOrMore,
                 AllowMultipleArgumentsPerToken = true,
-                IsRequired = false
             };
 
-            var npmListJsonFilesOption = new Option<List<string>>("--npm-list-json-files", "One or more paths to files generated by the 'npm list -a --json' command.")
+            var npmListJsonFilesOption = new Option<List<string>>("--npm-list-json-files")
             {
+                Description = "One or more paths to files generated by the 'npm list -a --json' command.",
                 Arity = ArgumentArity.ZeroOrMore,
                 AllowMultipleArgumentsPerToken = true,
-                IsRequired = false
             };
 
-            var outputOption = new Option<string>("--output-file", "Path where the generated NOTICE file will be saved.")
+            var outputOption = new Option<string>("--output-file")
             {
-                IsRequired = true
+                Description = "Path where the generated NOTICE file will be saved.",
+                Required = true
             };
 
-            var preambleFileOption = new Option<string>("--preamble-file", "Path to a text file whose contents will be included at the top of the generated NOTICE file.")
+            var preambleFileOption = new Option<string>("--preamble-file")
             {
-                IsRequired = false
+                Description = "Path to a text file whose contents will be included at the top of the generated NOTICE file."
             };
 
-            var batchSizeOption = new Option<int?>("--batch-size", $"Number of libraries to submit on a single API call. Batches will be submitted sequentially. The default is {DefaultBatchSize}.")
+            var batchSizeOption = new Option<int?>("--batch-size")
             {
-                IsRequired = false
+                Description = $"Number of libraries to submit on a single API call. Batches will be submitted sequentially. The default is {DefaultBatchSize}."
             };
 
-            var retryCountOption = new Option<int?>("--retry-count", $"Number of retries for each API call. The default is {DefaultRetryCount}.")
+            var retryCountOption = new Option<int?>("--retry-count")
             {
-                IsRequired = false
+                Description = $"Number of retries for each API call. The default is {DefaultRetryCount}."
             };
 
-            var timeoutOptionSecondsOption = new Option<int?>("--timeout-seconds", $"Timeout in seconds for each API call. The default is {DefaultTimeoutSeconds}.")
+            var timeoutOptionSecondsOption = new Option<int?>("--timeout-seconds")
             {
-                IsRequired = false
+                Description = $"Timeout in seconds for each API call. The default is {DefaultTimeoutSeconds}."
             };
 
-            rootCommand.AddOption(assetFilesOption);
-            rootCommand.AddOption(npmListJsonFilesOption);
-            rootCommand.AddOption(outputOption);
-            rootCommand.AddOption(preambleFileOption);
-            rootCommand.AddOption(batchSizeOption);
-            rootCommand.AddOption(retryCountOption);
-            rootCommand.AddOption(timeoutOptionSecondsOption);
+            rootCommand.Add(assetFilesOption);
+            rootCommand.Add(npmListJsonFilesOption);
+            rootCommand.Add(outputOption);
+            rootCommand.Add(preambleFileOption);
+            rootCommand.Add(batchSizeOption);
+            rootCommand.Add(retryCountOption);
+            rootCommand.Add(timeoutOptionSecondsOption);
 
-            rootCommand.SetHandler((assetFiles, npmListJsonFiles, outputFile, preambleFile, batchSize, retryCount, timeoutSeconds) =>
+            rootCommand.SetAction(async (ParseResult parseResult, CancellationToken cancel) =>
             {
+                var assetFiles = parseResult.GetValue(assetFilesOption) ?? [];
+                var npmListJsonFiles = parseResult.GetValue(npmListJsonFilesOption) ?? [];
+                var outputFile = parseResult.GetValue(outputOption)!; // Required = true guarantees a non-null value
+                var preambleFile = parseResult.GetValue(preambleFileOption);
+                var batchSize = parseResult.GetValue(batchSizeOption);
+                var retryCount = parseResult.GetValue(retryCountOption);
+                var timeoutSeconds = parseResult.GetValue(timeoutOptionSecondsOption);
+
                 var arguments = new ToolArguments
                 (
                     AssetFiles: assetFiles.Select(ResolvePath).ToImmutableArray(),
@@ -92,10 +101,10 @@ public static async Task<int> Main(string[] args)
                     Timeout: TimeSpan.FromSeconds(timeoutSeconds ?? DefaultTimeoutSeconds)
                 );
 
-                return MainInternal(arguments);
-            }, assetFilesOption, npmListJsonFilesOption, outputOption, preambleFileOption, batchSizeOption, retryCountOption, timeoutOptionSecondsOption);
+                return await MainInternal(arguments);
+            });
 
-            return await rootCommand.InvokeAsync(args);
+            return await rootCommand.Parse(args).InvokeAsync();
         }
 
         public record ToolArguments(