diff --git a/src/Fallout.Cli/Program.Update.cs b/src/Fallout.Cli/Commands/UpdateCommand.cs
similarity index 59%
rename from src/Fallout.Cli/Program.Update.cs
rename to src/Fallout.Cli/Commands/UpdateCommand.cs
index 145bf805c..6bf7ce2da 100644
--- a/src/Fallout.Cli/Program.Update.cs
+++ b/src/Fallout.Cli/Commands/UpdateCommand.cs
@@ -1,7 +1,7 @@
-using System;
 using System.IO;
 using System.Linq;
 using System.Text.Json.Nodes;
+using Fallout.Cli.Prompts;
 using Fallout.Common;
 using Fallout.Common.Execution;
 using Fallout.Common.IO;
@@ -10,37 +10,48 @@
 using Fallout.Common.Utilities;
 using static Fallout.Common.Constants;
 
-namespace Fallout.Cli;
+namespace Fallout.Cli.Commands;
 
-partial class Program
+/// <summary>
+/// <c>fallout :update</c>: updates the build scripts, build project, configuration file and global.json.
+/// </summary>
+public sealed class UpdateCommand : IFalloutCommand
 {
-    public static int Update(string[] args, AbsolutePath rootDirectory, AbsolutePath buildScript)
+    private readonly IConsolePrompts _prompts;
+
+    public UpdateCommand(IConsolePrompts prompts) => _prompts = prompts;
+
+    public string Name => "update";
+
+    // GetConfiguration / WriteBuildScripts / WriteConfigurationFile / BUILD_PROJECT_FILE remain on
+    // Program as internal residual until the #392 collapse PR extracts them into services.
+    public int Execute(string[] args, AbsolutePath rootDirectory, AbsolutePath buildScript)
     {
-        PrintInfo();
+        Program.PrintInfo();
         Logging.Configure();
 
         Assert.NotNull(rootDirectory);
 
         if (buildScript != null)
         {
-            ConfirmExecution("Update build scripts", () => UpdateBuildScripts(rootDirectory, buildScript));
-            ConfirmExecution("Update build project", () => UpdateBuildProject(buildScript));
+            _prompts.ConfirmExecution("Update build scripts", () => UpdateBuildScripts(rootDirectory, buildScript));
+            _prompts.ConfirmExecution("Update build project", () => UpdateBuildProject(buildScript));
         }
 
-        ConfirmExecution("Update configuration file", () => UpdateConfigurationFile(rootDirectory));
-        ConfirmExecution("Update global.json", () => UpdateGlobalJsonFile(rootDirectory));
+        _prompts.ConfirmExecution("Update configuration file", () => UpdateConfigurationFile(rootDirectory));
+        _prompts.ConfirmExecution("Update global.json", () => UpdateGlobalJsonFile(rootDirectory));
 
-        ShowCompletion("Updates");
+        _prompts.ShowCompletion("Updates");
 
         return 0;
     }
 
     private static void UpdateBuildScripts(AbsolutePath rootDirectory, AbsolutePath buildScript)
     {
-        var configuration = GetConfiguration(buildScript, evaluate: true);
-        var buildProjectFile = (AbsolutePath) configuration[BUILD_PROJECT_FILE];
+        var configuration = Program.GetConfiguration(buildScript, evaluate: true);
+        var buildProjectFile = (AbsolutePath) configuration[Program.BUILD_PROJECT_FILE];
 
-        WriteBuildScripts(
+        Program.WriteBuildScripts(
             scriptDirectory: buildScript.Parent,
             rootDirectory,
             buildDirectory: buildProjectFile.NotNull().Parent,
@@ -49,8 +60,8 @@ private static void UpdateBuildScripts(AbsolutePath rootDirectory, AbsolutePath
 
     private static void UpdateBuildProject(AbsolutePath buildScript)
     {
-        var configuration = GetConfiguration(buildScript, evaluate: true);
-        var projectFile = configuration[BUILD_PROJECT_FILE];
+        var configuration = Program.GetConfiguration(buildScript, evaluate: true);
+        var projectFile = configuration[Program.BUILD_PROJECT_FILE];
         ProjectModelTasks.Initialize();
         ProjectUpdater.Update(projectFile);
     }
@@ -64,7 +75,7 @@ private static void UpdateConfigurationFile(AbsolutePath rootDirectory)
         var solutionFile = rootDirectory / configurationFile.ReadAllLines().FirstOrDefault(x => !x.IsNullOrEmpty());
         configurationFile.DeleteFile();
 
-        WriteConfigurationFile(rootDirectory, solutionFile);
+        Program.WriteConfigurationFile(rootDirectory, solutionFile);
         Host.Warning($"The previous {FalloutFileName} file was transformed to a {FalloutDirectoryName} directory.");
         Host.Warning($"The .tmp directory can be cleared, as it is moved to {FalloutDirectoryName}/temp as well.");
         if (solutionFile != null)
diff --git a/src/Fallout.Cli/Program.cs b/src/Fallout.Cli/Program.cs
index 64b03492c..155e4603e 100644
--- a/src/Fallout.Cli/Program.cs
+++ b/src/Fallout.Cli/Program.cs
@@ -61,7 +61,10 @@ private static void RegisterCommands(IServiceCollection services)
 
         // Legacy handlers still living on Program, adapted until they are extracted into command
         // types. Each conversion deletes one line here plus its Program.X.cs partial.
-        services.AddSingleton<IFalloutCommand>(new DelegateCommand("update", Update));
+        services.AddSingleton<IFalloutCommand, UpdateCommand>();
+
+        // Legacy handlers still living on Program, adapted until they are extracted into command
+        // types. Each conversion deletes one line here plus its Program.X.cs partial.
         services.AddSingleton<IFalloutCommand>(new DelegateCommand("cake-convert", CakeConvert));
         services.AddSingleton<IFalloutCommand>(new DelegateCommand("cake-clean", CakeClean));
         services.AddSingleton<IFalloutCommand>(new DelegateCommand("secrets", Secrets));
diff --git a/tests/Fallout.Cli.Tests/Commands/FakeConsolePrompts.cs b/tests/Fallout.Cli.Tests/Commands/FakeConsolePrompts.cs
new file mode 100644
index 000000000..b0f63edcf
--- /dev/null
+++ b/tests/Fallout.Cli.Tests/Commands/FakeConsolePrompts.cs
@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using Fallout.Cli.Prompts;
+
+namespace Fallout.Cli.Tests.Commands;
+
+/// <summary>
+/// Configurable <see cref="IConsolePrompts"/> test double for exercising command interaction logic
+/// without a real console.
+/// </summary>
+internal sealed class FakeConsolePrompts : IConsolePrompts
+{
+    /// <summary>Answer returned by <see cref="PromptForConfirmation"/>.</summary>
+    public bool ConfirmationResult { get; init; }
+
+    /// <summary>When false, <see cref="ConfirmExecution"/> does not run its action (simulates a decline).</summary>
+    public bool InvokeConfirmedActions { get; init; }
+
+    /// <summary>Titles passed to <see cref="ShowCompletion"/>, in order.</summary>
+    public List<string> Completions { get; } = new();
+
+    public bool PromptForConfirmation(string question) => ConfirmationResult;
+    public void ShowInput(string emoji, string title, string value) { }
+    public void ShowCompletion(string title) => Completions.Add(title);
+    public void ClearPreviousLine() { }
+    public string PromptForInput(string question, string defaultValue = null) => defaultValue;
+    public string PromptForSecret(string title, int? minLength = null) => string.Empty;
+    public T PromptForChoice<T>(string question, params (T Value, string Description)[] choices) => default;
+
+    public void ConfirmExecution(string title, Action action)
+    {
+        if (InvokeConfirmedActions)
+            action();
+    }
+}
diff --git a/tests/Fallout.Cli.Tests/Commands/UpdateCommandTests.cs b/tests/Fallout.Cli.Tests/Commands/UpdateCommandTests.cs
new file mode 100644
index 000000000..d3c554f66
--- /dev/null
+++ b/tests/Fallout.Cli.Tests/Commands/UpdateCommandTests.cs
@@ -0,0 +1,35 @@
+using System;
+using System.IO;
+using Fallout.Cli.Commands;
+using Fallout.Common.IO;
+using FluentAssertions;
+using Xunit;
+
+namespace Fallout.Cli.Tests.Commands;
+
+public class UpdateCommandTests
+{
+    [Fact]
+    public void Name_IsUpdate()
+        => new UpdateCommand(new FakeConsolePrompts()).Name.Should().Be("update");
+
+    [Fact]
+    public void Execute_NoBuildScript_DeclineAll_ReturnsZeroAndReportsCompletion()
+    {
+        var dir = (AbsolutePath)Path.Combine(Path.GetTempPath(), "fallout-update-" + Guid.NewGuid().ToString("N"));
+        dir.CreateDirectory();
+        var prompts = new FakeConsolePrompts { InvokeConfirmedActions = false };
+        try
+        {
+            // No build script and every confirmation declined → no update steps run, but the command
+            // still completes cleanly.
+            new UpdateCommand(prompts).Execute([], dir, buildScript: null).Should().Be(0);
+
+            prompts.Completions.Should().Contain("Updates");
+        }
+        finally
+        {
+            Directory.Delete(dir, recursive: true);
+        }
+    }
+}