diff --git a/src/Directory.Packages.props b/src/Directory.Packages.props
index 6dd5253..e77b507 100644
--- a/src/Directory.Packages.props
+++ b/src/Directory.Packages.props
@@ -4,22 +4,22 @@
 	</PropertyGroup>
 
 	<ItemGroup Label="Build and versioning">
-		<PackageVersion Include="Meziantou.Analyzer" Version="3.0.15"/>
-		<PackageVersion Include="Microsoft.SourceLink.GitHub" Version="10.0.103"/>
+		<PackageVersion Include="Meziantou.Analyzer" Version="3.0.44"/>
+		<PackageVersion Include="Microsoft.SourceLink.GitHub" Version="10.0.201"/>
 		<PackageVersion Include="Microsoft.VisualStudio.Threading.Analyzers" Version="17.14.15"/>
 		<PackageVersion Include="Nerdbank.GitVersioning" Version="3.9.50"/>
 	</ItemGroup>
 
 	<ItemGroup Label="Runtime dependencies">
-		<PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="10.0.3"/>
-		<PackageVersion Include="Microsoft.Extensions.Hosting" Version="10.0.3"/>
-		<PackageVersion Include="ModelContextProtocol" Version="1.1.0"/>
-		<PackageVersion Include="Spectre.Console" Version="0.54.0"/>
+		<PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="10.0.5"/>
+		<PackageVersion Include="Microsoft.Extensions.Hosting" Version="10.0.5"/>
+		<PackageVersion Include="ModelContextProtocol" Version="1.2.0"/>
+		<PackageVersion Include="Spectre.Console" Version="0.55.0"/>
 	</ItemGroup>
 
 	<ItemGroup Label="Test dependencies">
 		<PackageVersion Include="AwesomeAssertions" Version="9.4.0"/>
-		<PackageVersion Include="Microsoft.Extensions.TimeProvider.Testing" Version="10.3.0"/>
+		<PackageVersion Include="Microsoft.Extensions.TimeProvider.Testing" Version="10.4.0"/>
 		<PackageVersion Include="XTerm.NET" Version="1.0.12"/>
 	</ItemGroup>
 
diff --git a/src/Repl.Mcp/McpServerHandler.cs b/src/Repl.Mcp/McpServerHandler.cs
index cb46faa..2773f7d 100644
--- a/src/Repl.Mcp/McpServerHandler.cs
+++ b/src/Repl.Mcp/McpServerHandler.cs
@@ -183,9 +183,9 @@ private async ValueTask<CallToolResult> CallToolAsync(
 	{
 		AttachServer(request.Server);
 		var snapshot = await GetSnapshotAsync(request.Server, cancellationToken).ConfigureAwait(false);
-		IDictionary<string, JsonElement> arguments = request.Params?.Arguments ?? EmptyArguments;
-		var toolName = request.Params?.Name ?? string.Empty;
-		var progressToken = request.Params?.ProgressToken;
+		IDictionary<string, JsonElement> arguments = request.Params.Arguments ?? EmptyArguments;
+		var toolName = request.Params.Name ?? string.Empty;
+		var progressToken = request.Params.ProgressToken;
 
 		if (_options.DynamicToolCompatibility == DynamicToolCompatibilityMode.DiscoverAndCallShim)
 		{
@@ -249,7 +249,7 @@ private async ValueTask<ReadResourceResult> ReadResourceAsync(
 	{
 		AttachServer(request.Server);
 		var snapshot = await GetSnapshotAsync(request.Server, cancellationToken).ConfigureAwait(false);
-		var uri = request.Params?.Uri ?? string.Empty;
+		var uri = request.Params.Uri ?? string.Empty;
 		var resource = snapshot.Resources.FirstOrDefault(candidate => candidate.IsMatch(uri));
 		if (resource is null)
 		{
@@ -277,7 +277,7 @@ private async ValueTask<GetPromptResult> GetPromptAsync(
 	{
 		AttachServer(request.Server);
 		var snapshot = await GetSnapshotAsync(request.Server, cancellationToken).ConfigureAwait(false);
-		var promptName = request.Params?.Name ?? string.Empty;
+		var promptName = request.Params.Name ?? string.Empty;
 		var prompt = snapshot.Prompts.FirstOrDefault(candidate =>
 			string.Equals(candidate.ProtocolPrompt.Name, promptName, StringComparison.OrdinalIgnoreCase));
 		if (prompt is null)
diff --git a/src/Repl.Mcp/ReplMcpServerPrompt.cs b/src/Repl.Mcp/ReplMcpServerPrompt.cs
index 8c6a147..ba9a45b 100644
--- a/src/Repl.Mcp/ReplMcpServerPrompt.cs
+++ b/src/Repl.Mcp/ReplMcpServerPrompt.cs
@@ -65,7 +65,7 @@ public override async ValueTask<GetPromptResult> GetAsync(
 		CancellationToken cancellationToken = default)
 	{
 		// Prompt arguments are already JsonElement — pass through directly.
-		var jsonArgs = request.Params?.Arguments is { } args
+		var jsonArgs = request.Params.Arguments is { } args
 			? new Dictionary<string, System.Text.Json.JsonElement>(args, StringComparer.Ordinal)
 			: new Dictionary<string, System.Text.Json.JsonElement>(StringComparer.Ordinal);
 
diff --git a/src/Repl.Mcp/ReplMcpServerResource.cs b/src/Repl.Mcp/ReplMcpServerResource.cs
index f3c8273..da0b7a9 100644
--- a/src/Repl.Mcp/ReplMcpServerResource.cs
+++ b/src/Repl.Mcp/ReplMcpServerResource.cs
@@ -64,7 +64,7 @@ public override async ValueTask<ReadResourceResult> ReadAsync(
 		RequestContext<ReadResourceRequestParams> request,
 		CancellationToken cancellationToken = default)
 	{
-		var arguments = ExtractArguments(request.Params!.Uri);
+		var arguments = ExtractArguments(request.Params.Uri);
 
 		var result = await _adapter.InvokeAsync(
 			_resourceName, arguments, request.Server, progressToken: null, cancellationToken)
diff --git a/src/Repl.Mcp/ReplMcpServerTool.cs b/src/Repl.Mcp/ReplMcpServerTool.cs
index 2029a92..ae9ec44 100644
--- a/src/Repl.Mcp/ReplMcpServerTool.cs
+++ b/src/Repl.Mcp/ReplMcpServerTool.cs
@@ -48,9 +48,9 @@ public override async ValueTask<CallToolResult> InvokeAsync(
 		RequestContext<CallToolRequestParams> request,
 		CancellationToken cancellationToken = default)
 	{
-		var arguments = request.Params?.Arguments
+		var arguments = request.Params.Arguments
 			?? new Dictionary<string, JsonElement>(StringComparer.Ordinal);
-		var progressToken = request.Params?.ProgressToken;
+		var progressToken = request.Params.ProgressToken;
 
 		return await _adapter.InvokeAsync(
 			_protocolTool.Name, arguments, request.Server, progressToken, cancellationToken)