diff --git a/CHANGELOG.md b/CHANGELOG.md
index 612b647d3..e39b84165 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,7 @@
 
 ### Fixes
 - Discord/Telegram: add per-request retry policy with configurable delays and docs.
+- Telegram: run long polling via grammY runner with per-chat sequentialization and concurrency tied to `agent.maxConcurrent`. Thanks @mukhtharcm for PR #366.
 - macOS: prevent gateway launchd startup race where the app could kill a just-started gateway; avoid unnecessary `bootout` and ensure the job is enabled at login. Fixes #306. Thanks @gupsammy for PR #387.
 - macOS: ignore ciao announcement cancellation rejections during Bonjour shutdown to avoid unhandled exits. Thanks @emanuelst for PR #419.
 - Pairing: generate DM pairing codes with CSPRNG, expire pending codes after 1 hour, and avoid re-sending codes for already pending requests.
diff --git a/src/telegram/bot.media.test.ts b/src/telegram/bot.media.test.ts
index 068f0fa7c..8f4038c1c 100644
--- a/src/telegram/bot.media.test.ts
+++ b/src/telegram/bot.media.test.ts
@@ -1,6 +1,7 @@
 import { describe, expect, it, vi } from "vitest";
 
 const useSpy = vi.fn();
+const middlewareUseSpy = vi.fn();
 const onSpy = vi.fn();
 const stopSpy = vi.fn();
 const sendChatActionSpy = vi.fn();
@@ -18,6 +19,7 @@ const apiStub: ApiStub = {
 vi.mock("grammy", () => ({
   Bot: class {
     api = apiStub;
+    use = middlewareUseSpy;
     on = onSpy;
     stop = stopSpy;
     constructor(public token: string) {}
@@ -26,6 +28,10 @@ vi.mock("grammy", () => ({
   webhookCallback: vi.fn(),
 }));
 
+vi.mock("@grammyjs/runner", () => ({
+  sequentialize: () => vi.fn(),
+}));
+
 const throttlerSpy = vi.fn(() => "throttler");
 vi.mock("@grammyjs/transformer-throttler", () => ({
   apiThrottler: () => throttlerSpy(),
diff --git a/src/telegram/bot.test.ts b/src/telegram/bot.test.ts
index 0175311e1..4b016dede 100644
--- a/src/telegram/bot.test.ts
+++ b/src/telegram/bot.test.ts
@@ -40,6 +40,7 @@ vi.mock("./pairing-store.js", () => ({
 }));
 
 const useSpy = vi.fn();
+const middlewareUseSpy = vi.fn();
 const onSpy = vi.fn();
 const stopSpy = vi.fn();
 const commandSpy = vi.fn();
@@ -71,6 +72,7 @@ const apiStub: ApiStub = {
 vi.mock("grammy", () => ({
   Bot: class {
     api = apiStub;
+    use = middlewareUseSpy;
     on = onSpy;
     stop = stopSpy;
     command = commandSpy;
@@ -80,6 +82,16 @@ vi.mock("grammy", () => ({
   webhookCallback: vi.fn(),
 }));
 
+const sequentializeMiddleware = vi.fn();
+const sequentializeSpy = vi.fn(() => sequentializeMiddleware);
+let sequentializeKey: ((ctx: unknown) => string) | undefined;
+vi.mock("@grammyjs/runner", () => ({
+  sequentialize: (keyFn: (ctx: unknown) => string) => {
+    sequentializeKey = keyFn;
+    return sequentializeSpy();
+  },
+}));
+
 const throttlerSpy = vi.fn(() => "throttler");
 
 vi.mock("@grammyjs/transformer-throttler", () => ({
@@ -104,6 +116,9 @@ describe("createTelegramBot", () => {
     sendPhotoSpy.mockReset();
     setMessageReactionSpy.mockReset();
     setMyCommandsSpy.mockReset();
+    middlewareUseSpy.mockReset();
+    sequentializeSpy.mockReset();
+    sequentializeKey = undefined;
   });
 
   it("installs grammY throttler", () => {
@@ -112,6 +127,30 @@ describe("createTelegramBot", () => {
     expect(useSpy).toHaveBeenCalledWith("throttler");
   });
 
+  it("sequentializes updates by chat and thread", () => {
+    createTelegramBot({ token: "tok" });
+    expect(sequentializeSpy).toHaveBeenCalledTimes(1);
+    expect(middlewareUseSpy).toHaveBeenCalledWith(
+      sequentializeSpy.mock.results[0]?.value,
+    );
+    expect(sequentializeKey).toBeDefined();
+    expect(
+      sequentializeKey?.({
+        message: { chat: { id: 123 } },
+      }),
+    ).toBe("telegram:123");
+    expect(
+      sequentializeKey?.({
+        message: { chat: { id: 123 }, message_thread_id: 9 },
+      }),
+    ).toBe("telegram:123:topic:9");
+    expect(
+      sequentializeKey?.({
+        update: { message: { chat: { id: 555 } } },
+      }),
+    ).toBe("telegram:555");
+  });
+
   it("wraps inbound message with Telegram envelope", async () => {
     const originalTz = process.env.TZ;
     process.env.TZ = "Europe/Vienna";
diff --git a/src/telegram/bot.ts b/src/telegram/bot.ts
index 5eacb3abb..836dbd1c9 100644
--- a/src/telegram/bot.ts
+++ b/src/telegram/bot.ts
@@ -1,6 +1,7 @@
 // @ts-nocheck
 import { Buffer } from "node:buffer";
 
+import { sequentialize } from "@grammyjs/runner";
 import { apiThrottler } from "@grammyjs/transformer-throttler";
 import type { ApiClientOptions, Message } from "grammy";
 import { Bot, InputFile, webhookCallback } from "grammy";
@@ -127,6 +128,30 @@ export function createTelegramBot(opts: TelegramBotOptions) {
 
   const bot = new Bot(opts.token, { client });
   bot.api.config.use(apiThrottler());
+  const resolveSequentialKey = (ctx: {
+    chat?: { id?: number };
+    message?: TelegramMessage;
+    update?: {
+      message?: TelegramMessage;
+      edited_message?: TelegramMessage;
+      callback_query?: { message?: TelegramMessage };
+    };
+  }) => {
+    const msg =
+      ctx.message ??
+      ctx.update?.message ??
+      ctx.update?.edited_message ??
+      ctx.update?.callback_query?.message;
+    const chatId = msg?.chat?.id ?? ctx.chat?.id;
+    const threadId = msg?.message_thread_id;
+    if (typeof chatId === "number") {
+      return threadId != null
+        ? `telegram:${chatId}:topic:${threadId}`
+        : `telegram:${chatId}`;
+    }
+    return "telegram:unknown";
+  };
+  bot.use(sequentialize(resolveSequentialKey));
 
   const mediaGroupBuffer = new Map<string, MediaGroupEntry>();
 
diff --git a/src/telegram/monitor.test.ts b/src/telegram/monitor.test.ts
index d4c240a75..740d28d95 100644
--- a/src/telegram/monitor.test.ts
+++ b/src/telegram/monitor.test.ts
@@ -1,4 +1,4 @@
-import { describe, expect, it, vi } from "vitest";
+import { beforeEach, describe, expect, it, vi } from "vitest";
 
 import { monitorTelegramProvider } from "./monitor.js";
 
@@ -23,6 +23,25 @@ const api = {
   setWebhook: vi.fn(),
   deleteWebhook: vi.fn(),
 };
+const { initSpy, runSpy, loadConfig } = vi.hoisted(() => ({
+  initSpy: vi.fn(async () => undefined),
+  runSpy: vi.fn(() => ({
+    task: () => Promise.resolve(),
+    stop: vi.fn(),
+  })),
+  loadConfig: vi.fn(() => ({
+    agent: { maxConcurrent: 2 },
+    telegram: {},
+  })),
+}));
+
+vi.mock("../config/config.js", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("../config/config.js")>();
+  return {
+    ...actual,
+    loadConfig,
+  };
+});
 
 vi.mock("./bot.js", () => ({
   createTelegramBot: () => {
@@ -38,6 +57,7 @@ vi.mock("./bot.js", () => ({
       on: vi.fn(),
       api,
       me: { username: "mybot" },
+      init: initSpy,
       stop: vi.fn(),
       start: vi.fn(),
     };
@@ -47,10 +67,7 @@ vi.mock("./bot.js", () => ({
 
 // Mock the grammyjs/runner to resolve immediately
 vi.mock("@grammyjs/runner", () => ({
-  run: vi.fn(() => ({
-    task: () => Promise.resolve(),
-    stop: vi.fn(),
-  })),
+  run: runSpy,
 }));
 
 vi.mock("../auto-reply/reply.js", () => ({
@@ -60,6 +77,15 @@ vi.mock("../auto-reply/reply.js", () => ({
 }));
 
 describe("monitorTelegramProvider (grammY)", () => {
+  beforeEach(() => {
+    loadConfig.mockReturnValue({
+      agent: { maxConcurrent: 2 },
+      telegram: {},
+    });
+    initSpy.mockClear();
+    runSpy.mockClear();
+  });
+
   it("processes a DM and sends reply", async () => {
     Object.values(api).forEach((fn) => {
       fn?.mockReset?.();
@@ -80,6 +106,23 @@ describe("monitorTelegramProvider (grammY)", () => {
     });
   });
 
+  it("uses agent maxConcurrent for runner concurrency", async () => {
+    runSpy.mockClear();
+    loadConfig.mockReturnValue({
+      agent: { maxConcurrent: 3 },
+      telegram: {},
+    });
+
+    await monitorTelegramProvider({ token: "tok" });
+
+    expect(runSpy).toHaveBeenCalledWith(
+      expect.anything(),
+      expect.objectContaining({
+        sink: { concurrency: 3 },
+      }),
+    );
+  });
+
   it("requires mention in groups by default", async () => {
     Object.values(api).forEach((fn) => {
       fn?.mockReset?.();
diff --git a/src/telegram/monitor.ts b/src/telegram/monitor.ts
index 45fd56254..574822a51 100644
--- a/src/telegram/monitor.ts
+++ b/src/telegram/monitor.ts
@@ -19,7 +19,8 @@ export type MonitorTelegramOpts = {
 };
 
 export async function monitorTelegramProvider(opts: MonitorTelegramOpts = {}) {
-  const { token } = resolveTelegramToken(loadConfig(), {
+  const cfg = loadConfig();
+  const { token } = resolveTelegramToken(cfg, {
     envToken: opts.token,
   });
   if (!token) {
@@ -30,8 +31,8 @@ export async function monitorTelegramProvider(opts: MonitorTelegramOpts = {}) {
 
   const proxyFetch =
     opts.proxyFetch ??
-    (loadConfig().telegram?.proxy
-      ? makeProxyFetch(loadConfig().telegram?.proxy as string)
+    (cfg.telegram?.proxy
+      ? makeProxyFetch(cfg.telegram?.proxy as string)
       : undefined);
 
   const bot = createTelegramBot({
@@ -56,6 +57,9 @@ export async function monitorTelegramProvider(opts: MonitorTelegramOpts = {}) {
 
   // Use grammyjs/runner for concurrent update processing
   const runner = run(bot, {
+    sink: {
+      concurrency: cfg.agent?.maxConcurrent ?? 1,
+    },
     runner: {
       fetch: {
         // Match grammY defaults
@@ -66,7 +70,7 @@ export async function monitorTelegramProvider(opts: MonitorTelegramOpts = {}) {
 
   const stopOnAbort = () => {
     if (opts.abortSignal?.aborted) {
-      runner.stop();
+      void runner.stop();
     }
   };
   opts.abortSignal?.addEventListener("abort", stopOnAbort, { once: true });