diff --git a/orleans/Chirper/Chirper.Client/Chirper.Client.csproj b/orleans/Chirper/Chirper.Client/Chirper.Client.csproj
index 7a56fc8f4b3..abea8cad7fa 100644
--- a/orleans/Chirper/Chirper.Client/Chirper.Client.csproj
+++ b/orleans/Chirper/Chirper.Client/Chirper.Client.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>
@@ -16,8 +16,8 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Spectre.Console" Version="0.48.0" />
-    <PackageReference Include="Spectre.Console.ImageSharp" Version="0.48.0" />
+    <PackageReference Include="Spectre.Console" Version="0.49.1" />
+    <PackageReference Include="Spectre.Console.ImageSharp" Version="0.49.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/orleans/Chirper/Chirper.Client/ShellHostedService.cs b/orleans/Chirper/Chirper.Client/ShellHostedService.cs
index 5ae6626c2bd..880233a9891 100644
--- a/orleans/Chirper/Chirper.Client/ShellHostedService.cs
+++ b/orleans/Chirper/Chirper.Client/ShellHostedService.cs
@@ -7,21 +7,12 @@
 
 namespace Chirper.Client;
 
-public sealed partial class ShellHostedService : BackgroundService
+public sealed partial class ShellHostedService(IClusterClient client, IHostApplicationLifetime applicationLifetime) : BackgroundService
 {
-    private readonly IClusterClient _client;
-    private readonly IHostApplicationLifetime _applicationLifetime;
-
     private ChirperConsoleViewer? _viewer;
     private IChirperViewer? _viewerRef;
     private IChirperAccount? _account;
 
-    public ShellHostedService(IClusterClient client, IHostApplicationLifetime applicationLifetime)
-    {
-        _client = client;
-        _applicationLifetime = applicationLifetime;
-    }
-
     protected override async Task ExecuteAsync(CancellationToken stoppingToken)
     {
         ShowHelp(true);
@@ -35,7 +26,7 @@ protected override async Task ExecuteAsync(CancellationToken stoppingToken)
             }
             else if (command is null or "/quit")
             {
-                _applicationLifetime.StopApplication();
+                applicationLifetime.StopApplication();
                 return;
             }
             else if (command.StartsWith("/user "))
@@ -44,7 +35,7 @@ protected override async Task ExecuteAsync(CancellationToken stoppingToken)
                 {
                     await Unobserve();
                     var username = match.Groups["username"].Value;
-                    _account = _client.GetGrain<IChirperAccount>(username);
+                    _account = client.GetGrain<IChirperAccount>(username);
 
                     AnsiConsole.MarkupLine("[bold grey][[[/][bold lime]✓[/][bold grey]]][/] The current user is now [navy]{0}[/]", username);
                 }
@@ -121,7 +112,7 @@ protected override async Task ExecuteAsync(CancellationToken stoppingToken)
                     if (_viewerRef is null)
                     {
                         _viewer = new ChirperConsoleViewer(_account.GetPrimaryKeyString());
-                        _viewerRef = _client.CreateObjectReference<IChirperViewer>(_viewer);
+                        _viewerRef = client.CreateObjectReference<IChirperViewer>(_viewer);
                     }
 
                     await _account.SubscribeAsync(_viewerRef);
diff --git a/orleans/Chirper/Chirper.Grains.Interfaces/Chirper.Grains.Interfaces.csproj b/orleans/Chirper/Chirper.Grains.Interfaces/Chirper.Grains.Interfaces.csproj
index 1e2bd3c7486..b04dad1cea5 100644
--- a/orleans/Chirper/Chirper.Grains.Interfaces/Chirper.Grains.Interfaces.csproj
+++ b/orleans/Chirper/Chirper.Grains.Interfaces/Chirper.Grains.Interfaces.csproj
@@ -1,13 +1,13 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Orleans.Sdk" Version="8.0.0" />
+    <PackageReference Include="Microsoft.Orleans.Sdk" Version="9.0.1" />
   </ItemGroup>
 
 </Project>
diff --git a/orleans/Chirper/Chirper.Grains.Interfaces/EnumerableExtensions.cs b/orleans/Chirper/Chirper.Grains.Interfaces/EnumerableExtensions.cs
index a8fe5b930bc..2475fcf48f9 100644
--- a/orleans/Chirper/Chirper.Grains.Interfaces/EnumerableExtensions.cs
+++ b/orleans/Chirper/Chirper.Grains.Interfaces/EnumerableExtensions.cs
@@ -1,7 +1,7 @@
-namespace System.Collections.Generic;
+namespace System.Collections.Generic;
 
 /// <summary>
-/// Helper extensions for enumerables.
+/// Helper extensions for <see cref="IEnumerable{T}">.
 /// </summary>
 public static class EnumerableExtensions
 {
diff --git a/orleans/Chirper/Chirper.Grains.Interfaces/Models/ChirperMessage.cs b/orleans/Chirper/Chirper.Grains.Interfaces/Models/ChirperMessage.cs
index 4d8f79745b8..344dd95a165 100644
--- a/orleans/Chirper/Chirper.Grains.Interfaces/Models/ChirperMessage.cs
+++ b/orleans/Chirper/Chirper.Grains.Interfaces/Models/ChirperMessage.cs
@@ -1,9 +1,9 @@
-namespace Chirper.Grains.Models;
+namespace Chirper.Grains.Models;
 
 /// <summary>
 /// Data object representing one Chirp message entry
 /// </summary>
-[GenerateSerializer]
+[GenerateSerializer, Immutable]
 public record class ChirperMessage(
     /// <summary>
     /// The message content for this chirp message entry.
diff --git a/orleans/Chirper/Chirper.Grains/Chirper.Grains.csproj b/orleans/Chirper/Chirper.Grains/Chirper.Grains.csproj
index ea74d6737f7..a3f6b16ea00 100644
--- a/orleans/Chirper/Chirper.Grains/Chirper.Grains.csproj
+++ b/orleans/Chirper/Chirper.Grains/Chirper.Grains.csproj
@@ -1,13 +1,13 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Orleans.Runtime" Version="8.0.0" />
+    <PackageReference Include="Microsoft.Orleans.Runtime" Version="9.0.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/orleans/Chirper/Chirper.Grains/ChirperAccount.cs b/orleans/Chirper/Chirper.Grains/ChirperAccount.cs
index 5d72315b932..c869f134662 100644
--- a/orleans/Chirper/Chirper.Grains/ChirperAccount.cs
+++ b/orleans/Chirper/Chirper.Grains/ChirperAccount.cs
@@ -1,4 +1,4 @@
-using System.Collections.Immutable;
+using System.Collections.Immutable;
 using Chirper.Grains.Models;
 using Microsoft.Extensions.Logging;
 using Orleans.Concurrency;
@@ -7,8 +7,12 @@
 namespace Chirper.Grains;
 
 [Reentrant]
-public sealed class ChirperAccount : Grain, IChirperAccount
+public sealed class ChirperAccount(
+   [PersistentState(stateName: "account", storageName: "AccountState")] IPersistentState<ChirperAccountState> state,
+   ILogger<ChirperAccount> logger) : Grain, IChirperAccount
 {
+    private static string GrainType => nameof(ChirperAccount);
+
     /// <summary>
     /// Size for the recently received message cache.
     /// </summary>
@@ -29,28 +33,17 @@ public sealed class ChirperAccount : Grain, IChirperAccount
     /// This list is not part of state and will not survive grain deactivation.
     /// </summary>
     private readonly HashSet<IChirperViewer> _viewers = new();
-    private readonly ILogger<ChirperAccount> _logger;
-    private readonly IPersistentState<ChirperAccountState> _state;
 
     /// <summary>
     /// Allows state writing to happen in the background.
     /// </summary>
     private Task? _outstandingWriteStateOperation;
 
-    public ChirperAccount(
-       [PersistentState(stateName: "account", storageName: "AccountState")] IPersistentState<ChirperAccountState> state,
-       ILogger<ChirperAccount> logger)
-    {
-        _state = state;
-        _logger = logger;
-    }
-
-    private static string GrainType => nameof(ChirperAccount);
     private string GrainKey => this.GetPrimaryKeyString();
 
     public override Task OnActivateAsync(CancellationToken _)
     {
-        _logger.LogInformation("{GrainType} {GrainKey} activated.", GrainType, GrainKey);
+        logger.LogInformation("{GrainType} {GrainKey} activated.", GrainType, GrainKey);
 
         return Task.CompletedTask;
     }
@@ -59,41 +52,41 @@ public async ValueTask PublishMessageAsync(string message)
     {
         var chirp = CreateNewChirpMessage(message);
 
-        _logger.LogInformation("{GrainType} {GrainKey} publishing new chirp message '{Chirp}'.",
+        logger.LogInformation("{GrainType} {GrainKey} publishing new chirp message '{Chirp}'.",
             GrainType, GrainKey, chirp);
 
-        _state.State.MyPublishedMessages.Enqueue(chirp);
+        state.State.MyPublishedMessages.Enqueue(chirp);
 
-        while (_state.State.MyPublishedMessages.Count > PublishedMessagesCacheSize)
+        while (state.State.MyPublishedMessages.Count > PublishedMessagesCacheSize)
         {
-            _state.State.MyPublishedMessages.Dequeue();
+            state.State.MyPublishedMessages.Dequeue();
         }
 
         await WriteStateAsync();
 
         // notify viewers of new message
-        _logger.LogInformation("{GrainType} {GrainKey} sending new chirp message to {ViewerCount} viewers.",
+        logger.LogInformation("{GrainType} {GrainKey} sending new chirp message to {ViewerCount} viewers.",
             GrainType, GrainKey, _viewers.Count);
 
         _viewers.ForEach(_ => _.NewChirp(chirp));
 
         // notify followers of a new message
-        _logger.LogInformation("{GrainType} {GrainKey} sending new chirp message to {FollowerCount} followers.",
-            GrainType, GrainKey, _state.State.Followers.Count);
+        logger.LogInformation("{GrainType} {GrainKey} sending new chirp message to {FollowerCount} followers.",
+            GrainType, GrainKey, state.State.Followers.Count);
 
-        await Task.WhenAll(_state.State.Followers.Values.Select(_ => _.NewChirpAsync(chirp)).ToArray());
+        await Task.WhenAll(state.State.Followers.Values.Select(_ => _.NewChirpAsync(chirp)).ToArray());
     }
 
     public ValueTask<ImmutableList<ChirperMessage>> GetReceivedMessagesAsync(int number, int start)
     {
         if (start < 0) start = 0;
-        if (start + number > _state.State.RecentReceivedMessages.Count)
+        if (start + number > state.State.RecentReceivedMessages.Count)
         {
-            number = _state.State.RecentReceivedMessages.Count - start;
+            number = state.State.RecentReceivedMessages.Count - start;
         }
 
         return ValueTask.FromResult(
-            _state.State.RecentReceivedMessages
+            state.State.RecentReceivedMessages
                 .Skip(start)
                 .Take(number)
                 .ToImmutableList());
@@ -101,7 +94,7 @@ public ValueTask<ImmutableList<ChirperMessage>> GetReceivedMessagesAsync(int num
 
     public async ValueTask FollowUserIdAsync(string username)
     {
-        _logger.LogInformation(
+        logger.LogInformation(
             "{GrainType} {UserName} > FollowUserName({TargetUserName}).",
             GrainType,
             GrainKey,
@@ -111,7 +104,7 @@ public async ValueTask FollowUserIdAsync(string username)
 
         await userToFollow.AddFollowerAsync(GrainKey, this.AsReference<IChirperSubscriber>());
 
-        _state.State.Subscriptions[username] = userToFollow;
+        state.State.Subscriptions[username] = userToFollow;
 
         await WriteStateAsync();
 
@@ -121,7 +114,7 @@ public async ValueTask FollowUserIdAsync(string username)
 
     public async ValueTask UnfollowUserIdAsync(string username)
     {
-        _logger.LogInformation(
+        logger.LogInformation(
             "{GrainType} {GrainKey} > UnfollowUserName({TargetUserName}).",
             GrainType,
             GrainKey,
@@ -132,7 +125,7 @@ await GrainFactory.GetGrain<IChirperPublisher>(username)
             .RemoveFollowerAsync(GrainKey);
 
         // remove this publisher from the subscriptions list
-        _state.State.Subscriptions.Remove(username);
+        state.State.Subscriptions.Remove(username);
 
         // save now
         await WriteStateAsync();
@@ -142,10 +135,10 @@ await GrainFactory.GetGrain<IChirperPublisher>(username)
     }
 
     public ValueTask<ImmutableList<string>> GetFollowingListAsync() =>
-        ValueTask.FromResult(_state.State.Subscriptions.Keys.ToImmutableList());
+        ValueTask.FromResult(state.State.Subscriptions.Keys.ToImmutableList());
 
     public ValueTask<ImmutableList<string>> GetFollowersListAsync() =>
-        ValueTask.FromResult(_state.State.Followers.Keys.ToImmutableList());
+        ValueTask.FromResult(state.State.Followers.Keys.ToImmutableList());
 
     public ValueTask SubscribeAsync(IChirperViewer viewer)
     {
@@ -162,12 +155,12 @@ public ValueTask UnsubscribeAsync(IChirperViewer viewer)
     public ValueTask<ImmutableList<ChirperMessage>> GetPublishedMessagesAsync(int number, int start)
     {
         if (start < 0) start = 0;
-        if (start + number > _state.State.MyPublishedMessages.Count)
+        if (start + number > state.State.MyPublishedMessages.Count)
         {
-            number = _state.State.MyPublishedMessages.Count - start;
+            number = state.State.MyPublishedMessages.Count - start;
         }
         return ValueTask.FromResult(
-            _state.State.MyPublishedMessages
+            state.State.MyPublishedMessages
                 .Skip(start)
                 .Take(number)
                 .ToImmutableList());
@@ -175,37 +168,37 @@ public ValueTask<ImmutableList<ChirperMessage>> GetPublishedMessagesAsync(int nu
 
     public async ValueTask AddFollowerAsync(string username, IChirperSubscriber follower)
     {
-        _state.State.Followers[username] = follower;
+        state.State.Followers[username] = follower;
         await WriteStateAsync();
         _viewers.ForEach(cv => cv.NewFollower(username));
     }
 
     public ValueTask RemoveFollowerAsync(string username)
     {
-        _state.State.Followers.Remove(username);
+        state.State.Followers.Remove(username);
         return WriteStateAsync();
     }
 
     public async Task NewChirpAsync(ChirperMessage chirp)
     {
-        _logger.LogInformation(
+        logger.LogInformation(
             "{GrainType} {GrainKey} received chirp message = {Chirp}",
             GrainType,
             GrainKey,
             chirp);
 
-        _state.State.RecentReceivedMessages.Enqueue(chirp);
+        state.State.RecentReceivedMessages.Enqueue(chirp);
 
         // only relevant when not using fixed queue
-        while (_state.State.RecentReceivedMessages.Count > ReceivedMessagesCacheSize) // to keep not more than the max number of messages
+        while (state.State.RecentReceivedMessages.Count > ReceivedMessagesCacheSize) // to keep not more than the max number of messages
         {
-            _state.State.RecentReceivedMessages.Dequeue();
+            state.State.RecentReceivedMessages.Dequeue();
         }
 
         await WriteStateAsync();
 
         // notify any viewers that a new chirp has been received
-        _logger.LogInformation(
+        logger.LogInformation(
             "{GrainType} {GrainKey} sending received chirp message to {ViewerCount} viewers",
             GrainType,
             GrainKey,
@@ -246,7 +239,7 @@ private async ValueTask WriteStateAsync()
         if (_outstandingWriteStateOperation is null)
         {
             // If after the initial write is completed, no other request initiated a new write operation, do it now.
-            currentWriteStateOperation = _state.WriteStateAsync();
+            currentWriteStateOperation = state.WriteStateAsync();
             _outstandingWriteStateOperation = currentWriteStateOperation;
         }
         else
diff --git a/orleans/Chirper/Chirper.Grains/ChirperAccountState.cs b/orleans/Chirper/Chirper.Grains/ChirperAccountState.cs
index a7fa6859b8a..6ec9694dd27 100644
--- a/orleans/Chirper/Chirper.Grains/ChirperAccountState.cs
+++ b/orleans/Chirper/Chirper.Grains/ChirperAccountState.cs
@@ -1,4 +1,4 @@
-using Chirper.Grains.Models;
+using Chirper.Grains.Models;
 
 namespace Chirper.Grains;
 
diff --git a/orleans/Chirper/Chirper.Server/Chirper.Server.csproj b/orleans/Chirper/Chirper.Server/Chirper.Server.csproj
index ed23905ba9d..a4481270818 100644
--- a/orleans/Chirper/Chirper.Server/Chirper.Server.csproj
+++ b/orleans/Chirper/Chirper.Server/Chirper.Server.csproj
@@ -2,14 +2,14 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Orleans.Server" Version="8.0.0" />
-    <PackageReference Include="OrleansDashboard" Version="8.0.0" />
+    <PackageReference Include="Microsoft.Orleans.Server" Version="9.0.1" />
+    <PackageReference Include="OrleansDashboard" Version="8.2.0" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/orleans/Chirper/Chirper.sln b/orleans/Chirper/Chirper.sln
index 4d921fc05f4..ff35074f486 100644
--- a/orleans/Chirper/Chirper.sln
+++ b/orleans/Chirper/Chirper.sln
@@ -9,6 +9,9 @@ EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Chirper.Server", "Chirper.Server\Chirper.Server.csproj", "{2C967379-D025-4EBB-96C0-1A4C6CBE4B4B}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Chirper.Client", "Chirper.Client\Chirper.Client.csproj", "{3BE53D35-938D-47D8-B135-501786B145DC}"
+	ProjectSection(ProjectDependencies) = postProject
+		{2C967379-D025-4EBB-96C0-1A4C6CBE4B4B} = {2C967379-D025-4EBB-96C0-1A4C6CBE4B4B}
+	EndProjectSection
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{1223A865-0D72-4BF7-8FCD-016A48F3EC68}"
 	ProjectSection(SolutionItems) = preProject
diff --git a/orleans/Chirper/Chirper.slnLaunch b/orleans/Chirper/Chirper.slnLaunch
new file mode 100644
index 00000000000..1c5cd154cd3
--- /dev/null
+++ b/orleans/Chirper/Chirper.slnLaunch
@@ -0,0 +1,15 @@
+[
+  {
+    "Name": "Server + Client",
+    "Projects": [
+      {
+        "Path": "Chirper.Client\\Chirper.Client.csproj",
+        "Action": "Start"
+      },
+      {
+        "Path": "Chirper.Server\\Chirper.Server.csproj",
+        "Action": "Start"
+      }
+    ]
+  }
+]
\ No newline at end of file
diff --git a/orleans/Chirper/README.md b/orleans/Chirper/README.md
index 82ed63e882f..0c0e892d838 100644
--- a/orleans/Chirper/README.md
+++ b/orleans/Chirper/README.md
@@ -43,7 +43,7 @@ There is also an `IChirperViewer` observer interface for applications to subscri
 
 ## Sample prerequisites
 
-This sample is written in C# and targets .NET 8.0. It requires the [.NET 8.0 SDK](https://dotnet.microsoft.com/download/dotnet/8.0) or later.
+This sample is written in C# and targets .NET 9.0. It requires the [.NET 9.0 SDK](https://dotnet.microsoft.com/download/dotnet/9.0) or later.
 
 ## Building the sample