diff --git a/WFDS.Server/Controllers/ActorController.cs b/WFDS.Server/Controllers/ActorController.cs
index fbaa46f..4cd6632 100644
--- a/WFDS.Server/Controllers/ActorController.cs
+++ b/WFDS.Server/Controllers/ActorController.cs
@@ -10,7 +10,7 @@ namespace WFDS.Server.Controllers;
 [ApiController]
 [Tags("actor")]
 [Route("api/v1/actor")]
-public class ActorController(IActorManager manager) : Controller
+public sealed class ActorController(IActorManager manager) : Controller
 {
     [HttpGet("list")]
     public IActionResult GetActors()
diff --git a/WFDS.Server/Controllers/ChalkController.cs b/WFDS.Server/Controllers/ChalkController.cs
index bfe8e76..61cd662 100644
--- a/WFDS.Server/Controllers/ChalkController.cs
+++ b/WFDS.Server/Controllers/ChalkController.cs
@@ -7,7 +7,7 @@ namespace WFDS.Server.Controllers;
 [ApiController]
 [Route("api/v1/chalk")]
 [Tags("chalk")]
-public class ChalkController(ICanvasManager canvas) : Controller
+public sealed class ChalkController(ICanvasManager canvas) : ControllerBase
 {
     [HttpDelete]
     [SwaggerOperation("clear all chalk")]
diff --git a/WFDS.Server/Controllers/EventController.cs b/WFDS.Server/Controllers/EventController.cs
index c5dbd33..5268cad 100644
--- a/WFDS.Server/Controllers/EventController.cs
+++ b/WFDS.Server/Controllers/EventController.cs
@@ -8,7 +8,7 @@ namespace WFDS.Server.Controllers;
 [ApiController]
 [Tags("event")]
 [Route("api/v1/event")]
-public class EventController(IActorSpawnManager manager) : Controller
+public sealed class EventController(IActorSpawnManager manager) : Controller
 {
     [HttpPost("bird")]
     [SwaggerOperation("spawn ambient bird actor")]
diff --git a/WFDS.Server/Controllers/ServerController.cs b/WFDS.Server/Controllers/ServerController.cs
index a0b0dc1..fbdf616 100644
--- a/WFDS.Server/Controllers/ServerController.cs
+++ b/WFDS.Server/Controllers/ServerController.cs
@@ -6,7 +6,7 @@ namespace WFDS.Server.Controllers;
 [ApiController]
 [Tags("server")]
 [Route("api/v1/server")]
-public class ServerController(IHostApplicationLifetime lifetime) : Controller
+public sealed class ServerController(IHostApplicationLifetime lifetime) : Controller
 {
     [HttpGet("status")]
     public IActionResult GetStatus()
diff --git a/WFDS.Server/Controllers/SessionController.cs b/WFDS.Server/Controllers/SessionController.cs
index be6d14e..9687c87 100644
--- a/WFDS.Server/Controllers/SessionController.cs
+++ b/WFDS.Server/Controllers/SessionController.cs
@@ -10,7 +10,7 @@ namespace WFDS.Server.Controllers;
 [Tags("session")]
 [Route("api/v1/session")]
 
-public class SessionController(SessionManager manager, LobbyManager lobby) : Controller
+public sealed class SessionController(SessionManager manager, LobbyManager lobby) : Controller
 {
     [HttpGet("info")]
     [SwaggerOperation("get lobby info")]
diff --git a/WFDS.Server/Core/Chalk/Canvas.cs b/WFDS.Server/Core/Chalk/Canvas.cs
index 2bf830a..b83d85e 100644
--- a/WFDS.Server/Core/Chalk/Canvas.cs
+++ b/WFDS.Server/Core/Chalk/Canvas.cs
@@ -4,7 +4,7 @@
 
 namespace WFDS.Server.Core.Chalk;
 
-public class Canvas
+public sealed class Canvas
 {
     public long CanvasId { get; init; }
     private Dictionary<(int, int), long> Data { get; } = [];
diff --git a/WFDS.Server/Core/WebExceptionHandler.cs b/WFDS.Server/Core/WebExceptionHandler.cs
index d8f3e4d..ed541b5 100644
--- a/WFDS.Server/Core/WebExceptionHandler.cs
+++ b/WFDS.Server/Core/WebExceptionHandler.cs
@@ -2,14 +2,14 @@
 
 namespace WFDS.Server.Core;
 
-public class WebExceptionHandler : IExceptionHandler
+public sealed class WebExceptionHandler : IExceptionHandler
 {
-    public async ValueTask<bool> TryHandleAsync(HttpContext httpContext, Exception ex, CancellationToken cancellationToken)
+    public async ValueTask<bool> TryHandleAsync(HttpContext httpContext, Exception exception, CancellationToken cancellationToken)
     {
         httpContext.Response.StatusCode = 500 ;
         await httpContext.Response.WriteAsJsonAsync(new
         {
-            error = ex.Message
+            error = exception.Message
         }, cancellationToken);
         return true;
     }
diff --git a/WFDS.Server/EventHandler/ActorCreateBroadcast.cs b/WFDS.Server/EventHandler/ActorCreateBroadcast.cs
index cb8ed92..e47f9bb 100644
--- a/WFDS.Server/EventHandler/ActorCreateBroadcast.cs
+++ b/WFDS.Server/EventHandler/ActorCreateBroadcast.cs
@@ -7,7 +7,7 @@
 
 namespace WFDS.Server.EventHandler;
 
-public class ActorCreateBroadcast(IActorManager actorManager, SessionManager sessionManager, LobbyManager lobby, SteamManager steam) : GameEventHandler<ActorCreateEvent>
+public sealed class ActorCreateBroadcast(IActorManager actorManager, SessionManager sessionManager, LobbyManager lobby, SteamManager steam) : GameEventHandler<ActorCreateEvent>
 {
     protected override void Handle(ActorCreateEvent e)
     {
diff --git a/WFDS.Server/EventHandler/ActorRemoveBroadcast.cs b/WFDS.Server/EventHandler/ActorRemoveBroadcast.cs
index f43f9cb..ada806a 100644
--- a/WFDS.Server/EventHandler/ActorRemoveBroadcast.cs
+++ b/WFDS.Server/EventHandler/ActorRemoveBroadcast.cs
@@ -6,7 +6,7 @@
 
 namespace WFDS.Server.EventHandler;
 
-public class ActorRemoveBroadcast(SessionManager sessionManager, LobbyManager lobby, SteamManager steam) : GameEventHandler<ActorRemoveEvent>
+public sealed class ActorRemoveBroadcast(SessionManager sessionManager, LobbyManager lobby, SteamManager steam) : GameEventHandler<ActorRemoveEvent>
 {
     protected override void Handle(ActorRemoveEvent e)
     {
diff --git a/WFDS.Server/EventHandler/AddPlayerToDb.cs b/WFDS.Server/EventHandler/AddPlayerToDb.cs
index 58bf1c9..30c2473 100644
--- a/WFDS.Server/EventHandler/AddPlayerToDb.cs
+++ b/WFDS.Server/EventHandler/AddPlayerToDb.cs
@@ -5,7 +5,7 @@
 
 namespace WFDS.Server.EventHandler;
 
-public class AddPlayerToDb(DatabaseContext dbContext) : GameEventHandler<PlayerJoinedEvent>
+public sealed class AddPlayerToDb(DatabaseContext dbContext) : GameEventHandler<PlayerJoinedEvent>
 {
     protected override void Handle(PlayerJoinedEvent e)
     {
diff --git a/WFDS.Server/EventHandler/CleanupLeavePlayerActors.cs b/WFDS.Server/EventHandler/CleanupLeavePlayerActors.cs
index 0b86281..64a2dc5 100644
--- a/WFDS.Server/EventHandler/CleanupLeavePlayerActors.cs
+++ b/WFDS.Server/EventHandler/CleanupLeavePlayerActors.cs
@@ -5,7 +5,7 @@
 
 namespace WFDS.Server.EventHandler;
 
-public class CleanupLeavePlayerActors(ILogger<CleanupLeavePlayerActors> logger, IActorManager actorManager) : GameEventHandler<PlayerLeaveEvent>
+public sealed class CleanupLeavePlayerActors(ILogger<CleanupLeavePlayerActors> logger, IActorManager actorManager) : GameEventHandler<PlayerLeaveEvent>
 {
     protected override void Handle(PlayerLeaveEvent e)
     {
diff --git a/WFDS.Server/EventHandler/LoadBanListFromDb.cs b/WFDS.Server/EventHandler/LoadBanListFromDb.cs
index d0301a6..4cc694d 100644
--- a/WFDS.Server/EventHandler/LoadBanListFromDb.cs
+++ b/WFDS.Server/EventHandler/LoadBanListFromDb.cs
@@ -7,7 +7,7 @@
 
 namespace WFDS.Server.EventHandler;
 
-public class LoadBanListFromDb(ILogger<LoadBanListFromDb> logger, DatabaseContext dbContext, SessionManager sessionManager) : GameEventHandler<LobbyCreatedEvent>
+public sealed class LoadBanListFromDb(ILogger<LoadBanListFromDb> logger, DatabaseContext dbContext, SessionManager sessionManager) : GameEventHandler<LobbyCreatedEvent>
 {
     protected override void Handle(LobbyCreatedEvent e)
     {
diff --git a/WFDS.Server/EventHandler/PlayerJoinUpdateTitle.cs b/WFDS.Server/EventHandler/PlayerJoinUpdateTitle.cs
index ed7715e..b835d5a 100644
--- a/WFDS.Server/EventHandler/PlayerJoinUpdateTitle.cs
+++ b/WFDS.Server/EventHandler/PlayerJoinUpdateTitle.cs
@@ -5,7 +5,7 @@
 
 namespace WFDS.Server.EventHandler;
 
-public class PlayerJoinUpdateTitle(LobbyManager lobby, SessionManager session) : GameEventHandler<PlayerJoinedEvent>
+public sealed class PlayerJoinUpdateTitle(LobbyManager lobby, SessionManager session) : GameEventHandler<PlayerJoinedEvent>
 {
     protected override void Handle(PlayerJoinedEvent e)
     {
diff --git a/WFDS.Server/EventHandler/PlayerLeaveUpdateTitle.cs b/WFDS.Server/EventHandler/PlayerLeaveUpdateTitle.cs
index ee51135..c11af09 100644
--- a/WFDS.Server/EventHandler/PlayerLeaveUpdateTitle.cs
+++ b/WFDS.Server/EventHandler/PlayerLeaveUpdateTitle.cs
@@ -5,7 +5,7 @@
 
 namespace WFDS.Server.EventHandler;
 
-public class PlayerLeaveUpdateTitle(LobbyManager lobby, SessionManager session) : GameEventHandler<PlayerLeaveEvent>
+public sealed class PlayerLeaveUpdateTitle(LobbyManager lobby, SessionManager session) : GameEventHandler<PlayerLeaveEvent>
 {
     protected override void Handle(PlayerLeaveEvent e)
     {
diff --git a/WFDS.Server/EventHandler/RainCloudInitializer.cs b/WFDS.Server/EventHandler/RainCloudInitializer.cs
index fac35e8..d6b5c20 100644
--- a/WFDS.Server/EventHandler/RainCloudInitializer.cs
+++ b/WFDS.Server/EventHandler/RainCloudInitializer.cs
@@ -7,7 +7,7 @@
 
 namespace WFDS.Server.EventHandler;
 
-public class RainCloudInitializer(IActorManager actorManager) : GameEventHandler<ActorCreateEvent>
+public sealed class RainCloudInitializer(IActorManager actorManager) : GameEventHandler<ActorCreateEvent>
 {
     protected override void Handle(ActorCreateEvent e)
     {
diff --git a/WFDS.Server/EventHandler/RainCloudMove.cs b/WFDS.Server/EventHandler/RainCloudMove.cs
index da626ee..57b40b3 100644
--- a/WFDS.Server/EventHandler/RainCloudMove.cs
+++ b/WFDS.Server/EventHandler/RainCloudMove.cs
@@ -7,7 +7,7 @@
 
 namespace WFDS.Server.EventHandler;
 
-public class RainCloudMove(IActorManager actorManager) : GameEventHandler<ActorTickEvent>
+public sealed class RainCloudMove(IActorManager actorManager) : GameEventHandler<ActorTickEvent>
 {
     protected override void Handle(ActorTickEvent e)
     {
diff --git a/WFDS.Server/EventHandler/RemoveAmbientBirdNearPlayer.cs b/WFDS.Server/EventHandler/RemoveAmbientBirdNearPlayer.cs
index be77374..eb3c969 100644
--- a/WFDS.Server/EventHandler/RemoveAmbientBirdNearPlayer.cs
+++ b/WFDS.Server/EventHandler/RemoveAmbientBirdNearPlayer.cs
@@ -7,7 +7,7 @@
 
 namespace WFDS.Server.EventHandler;
 
-public class RemoveAmbientBirdNearPlayer(ILogger<RemoveAmbientBirdNearPlayer> logger, IActorManager actorManager) : GameEventHandler<ActorTickEvent>
+public sealed class RemoveAmbientBirdNearPlayer(ILogger<RemoveAmbientBirdNearPlayer> logger, IActorManager actorManager) : GameEventHandler<ActorTickEvent>
 {
     protected override void Handle(ActorTickEvent e)
     {
diff --git a/WFDS.Server/EventHandler/RemovePlayerFromBannedPlayers.cs b/WFDS.Server/EventHandler/RemovePlayerFromBannedPlayers.cs
index 600ef69..65dcdfa 100644
--- a/WFDS.Server/EventHandler/RemovePlayerFromBannedPlayers.cs
+++ b/WFDS.Server/EventHandler/RemovePlayerFromBannedPlayers.cs
@@ -5,7 +5,7 @@
 
 namespace WFDS.Server.EventHandler;
 
-public class RemovePlayerFromBannedPlayers(ILogger<RemovePlayerFromBannedPlayers> logger, DatabaseContext dbContext) : GameEventHandler<PlayerUnBanEvent>
+public sealed class RemovePlayerFromBannedPlayers(ILogger<RemovePlayerFromBannedPlayers> logger, DatabaseContext dbContext) : GameEventHandler<PlayerUnBanEvent>
 {
     protected override void Handle(PlayerUnBanEvent e)
     {
diff --git a/WFDS.Server/EventHandler/UpdateActorTransform.cs b/WFDS.Server/EventHandler/UpdateActorTransform.cs
index fe71949..7c65390 100644
--- a/WFDS.Server/EventHandler/UpdateActorTransform.cs
+++ b/WFDS.Server/EventHandler/UpdateActorTransform.cs
@@ -4,7 +4,7 @@
 
 namespace WFDS.Server.EventHandler;
 
-public class UpdateActorTransform(IActorManager actorManager) : GameEventHandler<ActorTransformUpdateEvent>
+public sealed class UpdateActorTransform(IActorManager actorManager) : GameEventHandler<ActorTransformUpdateEvent>
 {
     protected override void Handle(ActorTransformUpdateEvent e)
     {
diff --git a/WFDS.Server/EventHandler/UpdateActorZone.cs b/WFDS.Server/EventHandler/UpdateActorZone.cs
index 5a8f391..26d9d14 100644
--- a/WFDS.Server/EventHandler/UpdateActorZone.cs
+++ b/WFDS.Server/EventHandler/UpdateActorZone.cs
@@ -4,7 +4,7 @@
 
 namespace WFDS.Server.EventHandler;
 
-public class UpdateActorZone(IActorManager actorManager) : GameEventHandler<ActorZoneUpdateEvent>
+public sealed class UpdateActorZone(IActorManager actorManager) : GameEventHandler<ActorZoneUpdateEvent>
 {
     protected override void Handle(ActorZoneUpdateEvent e)
     {
diff --git a/WFDS.Server/EventHandler/UpdateBannedPlayer.cs b/WFDS.Server/EventHandler/UpdateBannedPlayer.cs
index 2e5d835..c3ac2a8 100644
--- a/WFDS.Server/EventHandler/UpdateBannedPlayer.cs
+++ b/WFDS.Server/EventHandler/UpdateBannedPlayer.cs
@@ -6,7 +6,7 @@
 
 namespace WFDS.Server.EventHandler;
 
-public class UpdateBannedPlayer(DatabaseContext dbContext, ILogger<UpdateBannedPlayer> logger) : GameEventHandler<PlayerBanEvent>
+public sealed class UpdateBannedPlayer(DatabaseContext dbContext, ILogger<UpdateBannedPlayer> logger) : GameEventHandler<PlayerBanEvent>
 {
     protected override void Handle(PlayerBanEvent e)
     {
diff --git a/WFDS.Server/EventHandler/UpdatePlayerCosmetics.cs b/WFDS.Server/EventHandler/UpdatePlayerCosmetics.cs
index 4c09f01..65c0266 100644
--- a/WFDS.Server/EventHandler/UpdatePlayerCosmetics.cs
+++ b/WFDS.Server/EventHandler/UpdatePlayerCosmetics.cs
@@ -4,7 +4,7 @@
 
 namespace WFDS.Server.EventHandler;
 
-public class UpdatePlayerCosmetics(IActorManager actorManager) : GameEventHandler<PlayerCosmeticsUpdateEvent>
+public sealed class UpdatePlayerCosmetics(IActorManager actorManager) : GameEventHandler<PlayerCosmeticsUpdateEvent>
 {
     protected override void Handle(PlayerCosmeticsUpdateEvent e)
     {
diff --git a/WFDS.Server/EventHandler/UpdatePlayerHeldItem.cs b/WFDS.Server/EventHandler/UpdatePlayerHeldItem.cs
index 0d43deb..dc52cfb 100644
--- a/WFDS.Server/EventHandler/UpdatePlayerHeldItem.cs
+++ b/WFDS.Server/EventHandler/UpdatePlayerHeldItem.cs
@@ -4,7 +4,7 @@
 
 namespace WFDS.Server.EventHandler;
 
-public class UpdatePlayerHeldItem(IActorManager actorManager) : GameEventHandler<PlayerHeldItemUpdateEvent>
+public sealed class UpdatePlayerHeldItem(IActorManager actorManager) : GameEventHandler<PlayerHeldItemUpdateEvent>
 {
     protected override void Handle(PlayerHeldItemUpdateEvent e)
     {
diff --git a/WFDS.Server/PacketHandler/ActorActionHandler.cs b/WFDS.Server/PacketHandler/ActorActionHandler.cs
index 4a257dc..673df58 100644
--- a/WFDS.Server/PacketHandler/ActorActionHandler.cs
+++ b/WFDS.Server/PacketHandler/ActorActionHandler.cs
@@ -12,7 +12,7 @@
 namespace WFDS.Server.PacketHandler;
 
 [PacketType("actor_action")]
-public class ActorActionHandler(ILogger<ActorActionHandler> logger, IActorManager actorManager, SteamManager steam) : PacketHandler<ActorActionPacket>
+public sealed class ActorActionHandler(ILogger<ActorActionHandler> logger, IActorManager actorManager, SteamManager steam) : PacketHandler<ActorActionPacket>
 {
     protected override void Handle(Session sender, NetChannel channel, ActorActionPacket packet)
     {
diff --git a/WFDS.Server/PacketHandler/ActorRequestSendHandler.cs b/WFDS.Server/PacketHandler/ActorRequestSendHandler.cs
index 33ffd89..3699663 100644
--- a/WFDS.Server/PacketHandler/ActorRequestSendHandler.cs
+++ b/WFDS.Server/PacketHandler/ActorRequestSendHandler.cs
@@ -9,7 +9,7 @@
 namespace WFDS.Server.PacketHandler;
 
 [PacketType("actor_request_send")]
-public class ActorRequestSendHandler(ILogger<ActorRequestSendHandler> logger, IActorManager actorManager, SessionManager sessionManager) : PacketHandler<ActorRequestSendPacket>
+public sealed class ActorRequestSendHandler(ILogger<ActorRequestSendHandler> logger, IActorManager actorManager, SessionManager sessionManager) : PacketHandler<ActorRequestSendPacket>
 {
     protected override void Handle(Session sender, NetChannel channel, ActorRequestSendPacket packet)
     {
diff --git a/WFDS.Server/PacketHandler/ActorUpdateHandler.cs b/WFDS.Server/PacketHandler/ActorUpdateHandler.cs
index a6f79c0..b0c5464 100644
--- a/WFDS.Server/PacketHandler/ActorUpdateHandler.cs
+++ b/WFDS.Server/PacketHandler/ActorUpdateHandler.cs
@@ -9,7 +9,7 @@
 namespace WFDS.Server.PacketHandler;
 
 [PacketType("actor_update")]
-public class ActorUpdateHandler(IActorManager actorManager) : PacketHandler<ActorUpdatePacket>
+public sealed class ActorUpdateHandler(IActorManager actorManager) : PacketHandler<ActorUpdatePacket>
 {
     protected override void Handle(Session sender, NetChannel channel, ActorUpdatePacket packet)
     {
diff --git a/WFDS.Server/PacketHandler/ChalkPacketHandler.cs b/WFDS.Server/PacketHandler/ChalkPacketHandler.cs
index 754936c..a7ce307 100644
--- a/WFDS.Server/PacketHandler/ChalkPacketHandler.cs
+++ b/WFDS.Server/PacketHandler/ChalkPacketHandler.cs
@@ -6,7 +6,7 @@
 namespace WFDS.Server.PacketHandler;
 
 [PacketType("chalk_packet")]
-public class ChalkPacketHandler(ICanvasManager canvas, LobbyManager lobby, SessionManager session) : PacketHandler<ChalkPacket>
+public sealed class ChalkPacketHandler(ICanvasManager canvas, LobbyManager lobby, SessionManager session) : PacketHandler<ChalkPacket>
 {
     protected override void Handle(Session sender, NetChannel channel, ChalkPacket packet)
     {
diff --git a/WFDS.Server/PacketHandler/HandshakeHandler.cs b/WFDS.Server/PacketHandler/HandshakeHandler.cs
index a2fe428..4d5632e 100644
--- a/WFDS.Server/PacketHandler/HandshakeHandler.cs
+++ b/WFDS.Server/PacketHandler/HandshakeHandler.cs
@@ -6,7 +6,7 @@
 namespace WFDS.Server.PacketHandler;
 
 [PacketType("handshake")]
-public class HandshakeHandler(ILogger<HandshakeHandler> logger) : PacketHandler<HandshakePacket>
+public sealed class HandshakeHandler(ILogger<HandshakeHandler> logger) : PacketHandler<HandshakePacket>
 {
     protected override void Handle(Session sender, NetChannel channel, HandshakePacket packet)
     {
diff --git a/WFDS.Server/PacketHandler/InstanceActorHandler.cs b/WFDS.Server/PacketHandler/InstanceActorHandler.cs
index f6afc2d..e343a41 100644
--- a/WFDS.Server/PacketHandler/InstanceActorHandler.cs
+++ b/WFDS.Server/PacketHandler/InstanceActorHandler.cs
@@ -8,7 +8,7 @@
 namespace WFDS.Server.PacketHandler;
 
 [PacketType("instance_actor")]
-public class InstanceActorHandler(ILogger<InstanceActorHandler> logger, IActorManager actorManager, SessionManager sessionManager) : PacketHandler<InstanceActorPacket>
+public sealed class InstanceActorHandler(ILogger<InstanceActorHandler> logger, IActorManager actorManager, SessionManager sessionManager) : PacketHandler<InstanceActorPacket>
 {
     protected override void Handle(Session sender, NetChannel channel, InstanceActorPacket packet)
     {
diff --git a/WFDS.Server/PacketHandler/LetterReceivedHandler.cs b/WFDS.Server/PacketHandler/LetterReceivedHandler.cs
index 9e0c5ba..6950e4f 100644
--- a/WFDS.Server/PacketHandler/LetterReceivedHandler.cs
+++ b/WFDS.Server/PacketHandler/LetterReceivedHandler.cs
@@ -8,7 +8,7 @@
 namespace WFDS.Server.Handlers;
 
 [PacketType("letter_recieved")]
-public class LetterReceivedHandler(ILogger<LetterReceivedHandler> logger, SessionManager sessionManager, SteamManager steam) : PacketHandler<LetterReceivedPacket>
+public sealed class LetterReceivedHandler(ILogger<LetterReceivedHandler> logger, SessionManager sessionManager, SteamManager steam) : PacketHandler<LetterReceivedPacket>
 {
     protected override void Handle(Session sender, NetChannel channel, LetterReceivedPacket packet)
     {
diff --git a/WFDS.Server/PacketHandler/MessageHandler.cs b/WFDS.Server/PacketHandler/MessageHandler.cs
index 0c2c6bb..3d92c10 100644
--- a/WFDS.Server/PacketHandler/MessageHandler.cs
+++ b/WFDS.Server/PacketHandler/MessageHandler.cs
@@ -8,7 +8,7 @@
 namespace WFDS.Server.PacketHandler;
 
 [PacketType("message")]
-public class MessageHandler(ILogger<MessageHandler> logger) : PacketHandler<MessagePacket>
+public sealed class MessageHandler(ILogger<MessageHandler> logger) : PacketHandler<MessagePacket>
 {
     protected override void Handle(Session sender, NetChannel channel, MessagePacket packet)
     {
diff --git a/WFDS.Server/PacketHandler/NewPlayerJoinHandler.cs b/WFDS.Server/PacketHandler/NewPlayerJoinHandler.cs
index b80e443..9dc0b20 100644
--- a/WFDS.Server/PacketHandler/NewPlayerJoinHandler.cs
+++ b/WFDS.Server/PacketHandler/NewPlayerJoinHandler.cs
@@ -9,7 +9,7 @@
 namespace WFDS.Server.PacketHandler;
 
 [PacketType("new_player_join")]
-public class NewPlayerJoinHandler(ILogger<NewPlayerJoinHandler> logger, ICanvasManager canvas, SessionManager session) : PacketHandler<NewPlayerJoinPacket>
+public sealed class NewPlayerJoinHandler(ILogger<NewPlayerJoinHandler> logger, ICanvasManager canvas, SessionManager session) : PacketHandler<NewPlayerJoinPacket>
 {
     protected override void Handle(Session sender, NetChannel channel, NewPlayerJoinPacket packet)
     {
diff --git a/WFDS.Server/PacketHandler/RequestActorsHandler.cs b/WFDS.Server/PacketHandler/RequestActorsHandler.cs
index f1cc7cf..8931251 100644
--- a/WFDS.Server/PacketHandler/RequestActorsHandler.cs
+++ b/WFDS.Server/PacketHandler/RequestActorsHandler.cs
@@ -8,7 +8,7 @@
 namespace WFDS.Server.PacketHandler;
 
 [PacketType("request_actors")]
-public class RequestActorsHandler(ILogger<RequestActorsHandler> logger, IActorManager actorManager, SessionManager sessionManager) : PacketHandler<RequestActorsPacket>
+public sealed class RequestActorsHandler(ILogger<RequestActorsHandler> logger, IActorManager actorManager, SessionManager sessionManager) : PacketHandler<RequestActorsPacket>
 {
     protected override void Handle(Session sender, NetChannel channel, RequestActorsPacket _)
     {
diff --git a/WFDS.Server/PacketHandler/RequestPingHandler.cs b/WFDS.Server/PacketHandler/RequestPingHandler.cs
index fdfa191..9e3970b 100644
--- a/WFDS.Server/PacketHandler/RequestPingHandler.cs
+++ b/WFDS.Server/PacketHandler/RequestPingHandler.cs
@@ -7,7 +7,7 @@
 namespace WFDS.Server.PacketHandler;
 
 [PacketType("request_ping")]
-public class RequestPingHandler(SessionManager sessionManager, SteamManager steam) : PacketHandler<RequestPingPacket>
+public sealed class RequestPingHandler(SessionManager sessionManager, SteamManager steam) : PacketHandler<RequestPingPacket>
 {
     protected override void Handle(Session sender, NetChannel channel, RequestPingPacket packet)
     {