diff --git a/apps/client/src/network/handlers/LobbyHandler.ts b/apps/client/src/network/handlers/LobbyHandler.ts
index 00c037b..49ff35c 100644
--- a/apps/client/src/network/handlers/LobbyHandler.ts
+++ b/apps/client/src/network/handlers/LobbyHandler.ts
@@ -5,7 +5,11 @@
  */
 import type { Socket } from "socket.io-client";
 import { contracts as protocol } from "@repo/shared";
-import type { ServerToClientPayloadOf, StartGameRequestPayload } from "@repo/shared";
+import type {
+  LobbySettingsUpdatePayload,
+  ServerToClientPayloadOf,
+  StartGameRequestPayload,
+} from "@repo/shared";
 import { createClientSocketEventBridge } from "./socketEventBridge";
 
 /** ロビー画面で利用する通信操作の契約 */
@@ -26,6 +30,7 @@
     ) => void,
   ) => void;
   startGame: (payload?: StartGameRequestPayload) => void;
+  updateLobbySettings: (payload: LobbySettingsUpdatePayload) => void;
 };
 
 /** ロビー画面向けのソケットハンドラを生成する */
@@ -46,6 +51,9 @@
     startGame: (payload) => {
       emitEvent(protocol.SocketEvents.START_GAME, payload ?? {});
     },
+    updateLobbySettings: (payload) => {
+      emitEvent(protocol.SocketEvents.LOBBY_SETTINGS_UPDATE, payload);
+    },
   };
 };
 
diff --git a/apps/client/src/scenes/lobby/LobbyScene.tsx b/apps/client/src/scenes/lobby/LobbyScene.tsx
index f8dea50..8b22573 100644
--- a/apps/client/src/scenes/lobby/LobbyScene.tsx
+++ b/apps/client/src/scenes/lobby/LobbyScene.tsx
@@ -2,6 +2,7 @@
 import { domain } from "@repo/shared";
 import type { FieldSizePreset, StartGameRequestPayload } from "@repo/shared";
 import { config } from "@client/config";
+import { socketManager } from "@client/network/SocketManager";
 import { OVERLAY_BUTTON_STYLE } from "@client/scenes/shared/styles/overlayStyles";
 import { LobbyRuleModal } from "./components/LobbyRuleModal";
 import { LobbyStartConfirmModal } from "./components/LobbyStartConfirmModal";
@@ -10,6 +11,9 @@
   LOBBY_BACKGROUND_STYLE,
   LOBBY_CONTAINER_STYLE,
   LOBBY_CONTROLS_BLOCK_STYLE,
+  LOBBY_HOST_SETTINGS_LABEL_STYLE,
+  LOBBY_HOST_SETTINGS_STYLE,
+  LOBBY_HOST_SETTINGS_VALUE_STYLE,
   LOBBY_LABEL_STYLE,
   LOBBY_LEFT_INNER_STYLE,
   LOBBY_LEFT_PANEL_STYLE,
@@ -89,6 +93,18 @@
     });
   }, [minimumStartPlayerCount, maxStartPlayerCount]);
 
+  // ホストが設定を変更したらサーバーに通知して全員に反映する
+  useEffect(() => {
+    if (!isMeOwner) {
+      return;
+    }
+
+    socketManager.lobby.updateLobbySettings({
+      targetPlayerCount: selectedStartPlayerCount,
+      fieldSizePreset: selectedFieldSizePreset,
+    });
+  }, [isMeOwner, selectedStartPlayerCount, selectedFieldSizePreset]);
+
   const handleStartClick = () => {
     setIsStartConfirmVisible(true);
   };
@@ -219,6 +235,23 @@
                     ホストの開始を待っています...
                   </div>
 
+                  <div style={LOBBY_HOST_SETTINGS_STYLE}>
+                    <div>
+                      <div style={LOBBY_HOST_SETTINGS_LABEL_STYLE}>ゲーム人数</div>
+                      <div style={LOBBY_HOST_SETTINGS_VALUE_STYLE}>
+                        {room.targetPlayerCount != null
+                          ? `${room.targetPlayerCount}人`
+                          : "未設定"}
+                      </div>
+                    </div>
+                    <div>
+                      <div style={LOBBY_HOST_SETTINGS_LABEL_STYLE}>フィールドサイズ</div>
+                      <div style={LOBBY_HOST_SETTINGS_VALUE_STYLE}>
+                        {toFieldPresetLabel(room.fieldSizePreset)}
+                      </div>
+                    </div>
+                  </div>
+
                   <button
                     onClick={() => { setIsRuleModalOpen(true); }}
                     style={{ ...OVERLAY_BUTTON_STYLE, width: "100%" }}
diff --git a/apps/client/src/scenes/lobby/styles/LobbyScene.styles.ts b/apps/client/src/scenes/lobby/styles/LobbyScene.styles.ts
index 768171e..6ca66a1 100644
--- a/apps/client/src/scenes/lobby/styles/LobbyScene.styles.ts
+++ b/apps/client/src/scenes/lobby/styles/LobbyScene.styles.ts
@@ -116,6 +116,29 @@
 };
 
 
+/** 非オーナー向けホスト設定表示カードのスタイル */
+export const LOBBY_HOST_SETTINGS_STYLE: CSSProperties = {
+  padding: "12px 16px",
+  backgroundColor: "rgba(0,0,0,0.5)",
+  border: "1px solid rgba(255,255,255,0.2)",
+  borderRadius: "8px",
+  display: "flex",
+  flexDirection: "column",
+  gap: "6px",
+};
+
+/** 非オーナー向けホスト設定ラベルのスタイル */
+export const LOBBY_HOST_SETTINGS_LABEL_STYLE: CSSProperties = {
+  fontSize: "0.8rem",
+  color: "#aaa",
+};
+
+/** 非オーナー向けホスト設定値のスタイル */
+export const LOBBY_HOST_SETTINGS_VALUE_STYLE: CSSProperties = {
+  fontSize: "1.1rem",
+  fontWeight: 700,
+};
+
 /** 非オーナー待機表示のスタイル */
 export const LOBBY_WAITING_STYLE: CSSProperties = {
   padding: "20px",
diff --git a/apps/server/src/domains/room/RoomManager.ts b/apps/server/src/domains/room/RoomManager.ts
index 67b532c..8c38f8c 100644
--- a/apps/server/src/domains/room/RoomManager.ts
+++ b/apps/server/src/domains/room/RoomManager.ts
@@ -63,6 +63,22 @@
     return this.roomPhaseService.markRoomWaiting(roomId);
   }
 
+  // ロビー設定（ゲーム人数・フィールドサイズ）を更新してルームを返す
+  public updateLobbySettings(
+    roomId: string,
+    targetPlayerCount: number,
+    fieldSizePreset: domain.room.Room["fieldSizePreset"],
+  ): domain.room.Room | undefined {
+    const room = this.rooms.get(roomId);
+    if (!room || room.status !== domain.room.RoomPhase.WAITING) {
+      return undefined;
+    }
+
+    room.targetPlayerCount = targetPlayerCount;
+    room.fieldSizePreset = fieldSizePreset;
+    return room;
+  }
+
   // ルームを削除する
   public deleteRoom(roomId: string): boolean {
     return this.rooms.delete(roomId);
diff --git a/apps/server/src/domains/room/application/ports/roomUseCasePorts.ts b/apps/server/src/domains/room/application/ports/roomUseCasePorts.ts
index 8c27e69..f6c135d 100644
--- a/apps/server/src/domains/room/application/ports/roomUseCasePorts.ts
+++ b/apps/server/src/domains/room/application/ports/roomUseCasePorts.ts
@@ -85,6 +85,15 @@
   deleteRoom(roomId: string): boolean;
 }
 
+/** ロビー設定更新操作ポート */
+export interface UpdateLobbySettingsPort {
+  updateLobbySettings(
+    roomId: string,
+    targetPlayerCount: number,
+    fieldSizePreset: domain.room.Room["fieldSizePreset"],
+  ): domain.room.Room | undefined;
+}
+
 /** ルーム参加後にゲームランタイムを確保する操作ポート */
 export interface EnsureGameRuntimePort {
   ensureGameManagerForRoom(roomId: string): void;
diff --git a/apps/server/src/logging/contracts/payloadByScope.ts b/apps/server/src/logging/contracts/payloadByScope.ts
index 044d3d0..05ffae0 100644
--- a/apps/server/src/logging/contracts/payloadByScope.ts
+++ b/apps/server/src/logging/contracts/payloadByScope.ts
@@ -68,6 +68,13 @@
   socketId: string;
 };
 
+/** NetworkのLOBBY_SETTINGS_UPDATE不正ペイロードログ契約 */
+type NetworkLobbySettingsUpdateLogPayload = {
+  event: typeof protocol.SocketEvents.LOBBY_SETTINGS_UPDATE;
+  result: typeof logResults.IGNORED_INVALID_PAYLOAD;
+  socketId: string;
+};
+
 /** Networkスコープのログ契約ユニオン */
 type NetworkLogPayload =
   | NetworkConnectLogPayload
@@ -76,7 +83,8 @@
   | NetworkPingLogPayload
   | NetworkMoveLogPayload
   | NetworkPlaceBombLogPayload
-  | NetworkBombHitReportLogPayload;
+  | NetworkBombHitReportLogPayload
+  | NetworkLobbySettingsUpdateLogPayload;
 
 /** GameUseCaseのSTART_GAMEログ契約 */
 type GameUseCaseStartGameLogPayload = {
diff --git a/apps/server/src/network/handlers/payloadGuard.ts b/apps/server/src/network/handlers/payloadGuard.ts
index 3bd6936..ea3e8d5 100644
--- a/apps/server/src/network/handlers/payloadGuard.ts
+++ b/apps/server/src/network/handlers/payloadGuard.ts
@@ -31,6 +31,10 @@
     event: protocol.SocketEvents.BOMB_HIT_REPORT,
     result: logResults.IGNORED_INVALID_PAYLOAD,
   },
+  [protocol.SocketEvents.LOBBY_SETTINGS_UPDATE]: {
+    event: protocol.SocketEvents.LOBBY_SETTINGS_UPDATE,
+    result: logResults.IGNORED_INVALID_PAYLOAD,
+  },
 } as const;
 
 type PayloadGuardEventName = keyof typeof invalidPayloadLogByEvent;
diff --git a/apps/server/src/network/handlers/room/registerRoomHandlers.ts b/apps/server/src/network/handlers/room/registerRoomHandlers.ts
index bb3f083..3135a6a 100644
--- a/apps/server/src/network/handlers/room/registerRoomHandlers.ts
+++ b/apps/server/src/network/handlers/room/registerRoomHandlers.ts
@@ -7,29 +7,37 @@
 import type {
   JoinRoomEventRoomUseCasePort,
   JoinRoomEventRuntimeUseCasePort,
+  LobbySettingsUpdateEventRoomUseCasePort,
 } from "@server/network/types/connectionPorts";
 import { createSocketRegistrationContext } from "@server/network/handlers/registration";
-import { isJoinRoomPayload } from "@server/network/validation/socketPayloadValidators";
+import {
+  isJoinRoomPayload,
+  isLobbySettingsUpdatePayload,
+} from "@server/network/validation/socketPayloadValidators";
 import type { RoomOutputAdapter } from "./createRoomOutputAdapter";
 import {
   handleJoinRoomEvent,
+  handleLobbySettingsUpdateEvent,
   type JoinRoomEventPayload,
   type JoinRoomOrchestratorDeps,
+  type LobbySettingsUpdateOrchestratorDeps,
 } from "./roomEventOrchestrators";
 import {
   registerGuardedEvent,
   type GuardedEventDefinition,
 } from "@server/network/handlers/eventDefinitionRegistrar";
 
+type RoomHandlerRoomUseCasePort = JoinRoomEventRoomUseCasePort & LobbySettingsUpdateEventRoomUseCasePort;
+
 type JoinRoomEventDefinition = GuardedEventDefinition<
   typeof protocol.SocketEvents.JOIN_ROOM,
   JoinRoomEventPayload
 >;
 
-/** ルーム受信イベントごとの入力検証関数を保持するテーブル */
-const roomPayloadValidators = {
-  [protocol.SocketEvents.JOIN_ROOM]: isJoinRoomPayload,
-} as const;
+type LobbySettingsUpdateEventDefinition = GuardedEventDefinition<
+  typeof protocol.SocketEvents.LOBBY_SETTINGS_UPDATE,
+  LobbySettingsUpdateOrchestratorDeps["roomManager"] extends infer _ ? Parameters<typeof handleLobbySettingsUpdateEvent>[1] : never
+>;
 
 /** ルームイベント調停で利用する依存束を生成する */
 const createJoinRoomOrchestratorDeps = (
@@ -49,38 +57,66 @@
   };
 };
 
+/** ロビー設定更新イベント調停で利用する依存束を生成する */
+const createLobbySettingsUpdateOrchestratorDeps = (
+  socket: Socket,
+  roomManager: LobbySettingsUpdateEventRoomUseCasePort,
+  roomOutputAdapter: RoomOutputAdapter,
+): LobbySettingsUpdateOrchestratorDeps => {
+  return {
+    socketId: socket.id,
+    roomManager,
+    output: roomOutputAdapter,
+  };
+};
+
 /** JOIN_ROOMイベント定義を生成する */
 const createJoinRoomEventDefinition = (
   deps: JoinRoomOrchestratorDeps,
 ): JoinRoomEventDefinition => {
   return {
     event: protocol.SocketEvents.JOIN_ROOM,
-    validator: roomPayloadValidators[protocol.SocketEvents.JOIN_ROOM],
+    validator: isJoinRoomPayload,
     orchestrate: async (payload) => {
       await handleJoinRoomEvent(deps, payload);
     },
   };
 };
 
-/** ルーム参加イベントを検証して参加ユースケースへ連携する */
+/** LOBBY_SETTINGS_UPDATEイベント定義を生成する */
+const createLobbySettingsUpdateEventDefinition = (
+  deps: LobbySettingsUpdateOrchestratorDeps,
+): LobbySettingsUpdateEventDefinition => {
+  return {
+    event: protocol.SocketEvents.LOBBY_SETTINGS_UPDATE,
+    validator: isLobbySettingsUpdatePayload,
+    orchestrate: (payload) => {
+      handleLobbySettingsUpdateEvent(deps, payload);
+    },
+  };
+};
+
+/** ルーム関連イベントを検証してユースケースへ連携する */
 export const registerRoomHandlers = (
   socket: Socket,
-  roomManager: JoinRoomEventRoomUseCasePort,
+  roomManager: RoomHandlerRoomUseCasePort,
   runtimeRegistry: JoinRoomEventRuntimeUseCasePort,
   roomOutputAdapter: RoomOutputAdapter,
 ) => {
-  const orchestratorDeps = createJoinRoomOrchestratorDeps(
+  const { onEvent, guardOnEvent } = createSocketRegistrationContext(socket);
+
+  const joinRoomDeps = createJoinRoomOrchestratorDeps(
     socket,
     roomManager,
     runtimeRegistry,
     roomOutputAdapter,
   );
-  const { onEvent, guardOnEvent } = createSocketRegistrationContext(socket);
-
-  // 検証が必要なイベントを宣言的に登録する
-  const joinRoomEventDefinition = createJoinRoomEventDefinition(
-    orchestratorDeps,
+  const lobbySettingsDeps = createLobbySettingsUpdateOrchestratorDeps(
+    socket,
+    roomManager,
+    roomOutputAdapter,
   );
 
-  registerGuardedEvent(onEvent, guardOnEvent, joinRoomEventDefinition);
+  registerGuardedEvent(onEvent, guardOnEvent, createJoinRoomEventDefinition(joinRoomDeps));
+  registerGuardedEvent(onEvent, guardOnEvent, createLobbySettingsUpdateEventDefinition(lobbySettingsDeps));
 };
diff --git a/apps/server/src/network/handlers/room/roomEventOrchestrators.ts b/apps/server/src/network/handlers/room/roomEventOrchestrators.ts
index 4fbd750..c0eeb23 100644
--- a/apps/server/src/network/handlers/room/roomEventOrchestrators.ts
+++ b/apps/server/src/network/handlers/room/roomEventOrchestrators.ts
@@ -5,12 +5,14 @@
  * 本ファイルではランタイム未解決ログ対象イベントを扱わない
  */
 import { domain } from "@repo/shared";
+import type { LobbySettingsUpdatePayload } from "@repo/shared";
 import { joinRoomUseCase } from "@server/domains/room/application/useCases/joinRoomUseCase";
 import { logEvent } from "@server/logging/logger";
 import { logResults, logScopes, roomUseCaseLogEvents } from "@server/logging/index";
 import type {
   JoinRoomEventRoomUseCasePort,
   JoinRoomEventRuntimeUseCasePort,
+  LobbySettingsUpdateEventRoomUseCasePort,
 } from "@server/network/types/connectionPorts";
 import type { RoomOutputAdapter } from "./createRoomOutputAdapter";
 
@@ -26,6 +28,35 @@
 /** JOIN_ROOMイベントの入力ペイロード型 */
 export type JoinRoomEventPayload = Parameters<typeof handleJoinRoomEvent>[1];
 
+/** LOBBY_SETTINGS_UPDATEイベント調停で利用する依存集合 */
+export type LobbySettingsUpdateOrchestratorDeps = {
+  socketId: string;
+  roomManager: LobbySettingsUpdateEventRoomUseCasePort;
+  output: RoomOutputAdapter;
+};
+
+/** LOBBY_SETTINGS_UPDATEイベントを調停してルーム設定を更新し全員に通知する */
+export const handleLobbySettingsUpdateEvent = (
+  deps: LobbySettingsUpdateOrchestratorDeps,
+  payload: LobbySettingsUpdatePayload,
+): void => {
+  const room = deps.roomManager.getRoomByOwnerId(deps.socketId);
+  if (!room) {
+    return;
+  }
+
+  const updatedRoom = deps.roomManager.updateLobbySettings(
+    room.roomId,
+    payload.targetPlayerCount,
+    payload.fieldSizePreset,
+  );
+  if (!updatedRoom) {
+    return;
+  }
+
+  deps.output.publishRoomUpdateToRoom(room.roomId, updatedRoom);
+};
+
 /** JOIN_ROOMイベントを調停して参加ユースケースを実行する */
 export const handleJoinRoomEvent = async (
   deps: JoinRoomOrchestratorDeps,
diff --git a/apps/server/src/network/types/connectionPorts.ts b/apps/server/src/network/types/connectionPorts.ts
index 70f9853..734602e 100644
--- a/apps/server/src/network/types/connectionPorts.ts
+++ b/apps/server/src/network/types/connectionPorts.ts
@@ -18,6 +18,7 @@
   FindRoomByPlayerPort,
   JoinRoomPort,
   RoomPhaseTransitionPort,
+  UpdateLobbySettingsPort,
 } from "@server/domains/room/application/ports/roomUseCasePorts";
 
 /** 接続時のルーム処理で利用する入力ポート集合 */
@@ -48,6 +49,11 @@
 /** ルーム参加イベント調停で利用するルーム依存ポート */
 export type JoinRoomEventRoomUseCasePort = Pick<ConnectionRoomPort, "addPlayerToRoom">;
 
+/** ロビー設定更新イベント調停で利用するルーム依存ポート */
+export type LobbySettingsUpdateEventRoomUseCasePort =
+  & Pick<ConnectionRoomPort, "getRoomByOwnerId">
+  & UpdateLobbySettingsPort;
+
 /** ルーム参加イベント調停で利用するランタイム依存ポート */
 export type JoinRoomEventRuntimeUseCasePort = Pick<
   ConnectionRuntimePort,
@@ -59,7 +65,8 @@
   & ConnectionRoomPort
   & DisconnectRoomPort
   & FindRoomByIdPort
-  & DeleteRoomPort;
+  & DeleteRoomPort
+  & UpdateLobbySettingsPort;
 
 /** ソケット接続全体で利用するランタイム管理ポート集合 */
 export type SocketConnectionRuntimePort =
diff --git a/apps/server/src/network/validation/socketPayloadValidators.ts b/apps/server/src/network/validation/socketPayloadValidators.ts
index 1c82b78..c03ecf2 100644
--- a/apps/server/src/network/validation/socketPayloadValidators.ts
+++ b/apps/server/src/network/validation/socketPayloadValidators.ts
@@ -4,6 +4,7 @@
  */
 import type {
   domain,
+  LobbySettingsUpdatePayload,
   PlaceBombPayload,
   BombHitReportPayload,
   StartGameRequestPayload,
@@ -102,6 +103,33 @@
   );
 };
 
+/** LOBBY_SETTINGS_UPDATEイベントのペイロードがロビー設定情報であるか判定する */
+export const isLobbySettingsUpdatePayload = (
+  value: unknown,
+): value is LobbySettingsUpdatePayload => {
+  if (typeof value !== "object" || value === null) {
+    return false;
+  }
+
+  const candidate = value as Record<string, unknown>;
+  const { targetPlayerCount, fieldSizePreset } = candidate;
+
+  const isValidCount = (
+    typeof targetPlayerCount === "number" &&
+    Number.isInteger(targetPlayerCount) &&
+    targetPlayerCount > 0
+  );
+
+  const isValidPreset = (
+    fieldSizePreset === "SMALL"
+    || fieldSizePreset === "MEDIUM"
+    || fieldSizePreset === "LARGE"
+    || fieldSizePreset === "XLARGE"
+  );
+
+  return isValidCount && isValidPreset;
+};
+
 /** JOIN_ROOMイベントのペイロードが参加情報であるか判定する */
 export const isJoinRoomPayload = (
   value: unknown,
diff --git a/packages/shared/src/domains/room/room.type.ts b/packages/shared/src/domains/room/room.type.ts
index 22d8039..fa2af80 100644
--- a/packages/shared/src/domains/room/room.type.ts
+++ b/packages/shared/src/domains/room/room.type.ts
@@ -25,6 +25,8 @@
   status: RoomPhase;
   maxPlayers: number;
   fieldSizePreset: FieldSizePreset;
+  /** ホストがロビーで選択したゲーム参加人数 */
+  targetPlayerCount?: number;
 }
 
 /** ルーム参加時に送信するペイロード */
diff --git a/packages/shared/src/protocol/eventPayloads.ts b/packages/shared/src/protocol/eventPayloads.ts
index ac0ca32..3fd765c 100644
--- a/packages/shared/src/protocol/eventPayloads.ts
+++ b/packages/shared/src/protocol/eventPayloads.ts
@@ -10,6 +10,7 @@
 /** ロビーイベントのペイロード型を再公開する */
 export type {
   JoinRoomPayload,
+  LobbySettingsUpdatePayload,
   RoomJoinRejectedPayload,
   RoomUpdatePayload,
 } from "./payloads/lobbyPayloads";
diff --git a/packages/shared/src/protocol/maps/lobbyEventPayloadMap.ts b/packages/shared/src/protocol/maps/lobbyEventPayloadMap.ts
index 9625774..fcb3873 100644
--- a/packages/shared/src/protocol/maps/lobbyEventPayloadMap.ts
+++ b/packages/shared/src/protocol/maps/lobbyEventPayloadMap.ts
@@ -6,6 +6,7 @@
 import { SocketEvents } from "../socketEvents";
 import type {
   JoinRoomPayload,
+  LobbySettingsUpdatePayload,
   RoomJoinRejectedPayload,
   RoomUpdatePayload,
 } from "../payloads/lobbyPayloads";
@@ -13,6 +14,7 @@
 /** ロビー関連のクライアント送信イベントペイロード対応表 */
 export type LobbyClientToServerEventPayloadMap = {
   [SocketEvents.JOIN_ROOM]: JoinRoomPayload;
+  [SocketEvents.LOBBY_SETTINGS_UPDATE]: LobbySettingsUpdatePayload;
 };
 
 /** ロビー関連のサーバー送信イベントペイロード対応表 */
diff --git a/packages/shared/src/protocol/payloads/lobbyPayloads.ts b/packages/shared/src/protocol/payloads/lobbyPayloads.ts
index 3f5cdcb..171984e 100644
--- a/packages/shared/src/protocol/payloads/lobbyPayloads.ts
+++ b/packages/shared/src/protocol/payloads/lobbyPayloads.ts
@@ -13,3 +13,9 @@
 
 /** ROOM_UPDATE イベントで送受信するルーム状態情報 */
 export type RoomUpdatePayload = roomTypes.Room;
+
+/** LOBBY_SETTINGS_UPDATE イベントでホストが送信するロビー設定情報 */
+export type LobbySettingsUpdatePayload = {
+  targetPlayerCount: number;
+  fieldSizePreset: roomTypes.Room["fieldSizePreset"];
+};
diff --git a/packages/shared/src/protocol/socketEvents.ts b/packages/shared/src/protocol/socketEvents.ts
index 242ae61..85fe404 100644
--- a/packages/shared/src/protocol/socketEvents.ts
+++ b/packages/shared/src/protocol/socketEvents.ts
@@ -14,6 +14,7 @@
   JOIN_ROOM: "join-room",
   ROOM_JOIN_REJECTED: "room-join-rejected",
   ROOM_UPDATE: "room-update",
+  LOBBY_SETTINGS_UPDATE: "lobby-settings-update",
   START_GAME: "start-game",
   GAME_START: "game-start",
   READY_FOR_GAME: "ready-for-game",