diff --git a/packages/client/src/client.ts b/packages/client/src/client.ts
index d0b0b714..3123b0b6 100644
--- a/packages/client/src/client.ts
+++ b/packages/client/src/client.ts
@@ -186,8 +186,12 @@ import {
     User,
     UsersIndex,
 } from './types'
-import { MaybeArray, MaybeAsync, TelegramConnection } from '@mtcute/core'
-import { Lock } from './utils/lock'
+import {
+    AsyncLock,
+    MaybeArray,
+    MaybeAsync,
+    TelegramConnection,
+} from '@mtcute/core'
 import { tdFileId } from '@mtcute/file-id'
 
 export interface TelegramClient extends BaseTelegramClient {
@@ -2974,7 +2978,7 @@ export class TelegramClient extends BaseTelegramClient {
     protected _connectionsForInline: Record<number, TelegramConnection>
     protected _parseModes: Record<string, IMessageEntityParser>
     protected _defaultParseMode: string | null
-    protected _updLock: Lock
+    protected _updLock: AsyncLock
     protected _pts: number
     protected _date: number
     protected _cpts: Record<number, number>
@@ -2986,7 +2990,7 @@ export class TelegramClient extends BaseTelegramClient {
         this._connectionsForInline = {}
         this._parseModes = {}
         this._defaultParseMode = null
-        this._updLock = new Lock()
+        this._updLock = new AsyncLock()
         // we dont need to initialize state fields since
         // they are always loaded either from the server, or from storage.
 
diff --git a/packages/client/src/methods/_imports.ts b/packages/client/src/methods/_imports.ts
index 06cebd30..06eb168e 100644
--- a/packages/client/src/methods/_imports.ts
+++ b/packages/client/src/methods/_imports.ts
@@ -38,14 +38,16 @@ import {
     ChatInviteLink,
     UsersIndex,
     ChatsIndex,
-    GameHighScore
+    GameHighScore,
 } from '../types'
 
 // @copy
-import { MaybeArray, MaybeAsync, TelegramConnection } from '@mtcute/core'
-
-// @copy
-import { Lock } from '../utils/lock'
+import {
+    MaybeArray,
+    MaybeAsync,
+    TelegramConnection,
+    AsyncLock,
+} from '@mtcute/core'
 
 // @copy
 import { tdFileId } from '@mtcute/file-id'
diff --git a/packages/client/src/methods/updates.ts b/packages/client/src/methods/updates.ts
index b3a7d5f6..c285d08d 100644
--- a/packages/client/src/methods/updates.ts
+++ b/packages/client/src/methods/updates.ts
@@ -7,9 +7,8 @@ import {
     peerToInputPeer,
 } from '../utils/peer-utils'
 import { extractChannelIdFromUpdate } from '../utils/misc-utils'
-import { Lock } from '../utils/lock'
 import bigInt from 'big-integer'
-import { MAX_CHANNEL_ID } from '@mtcute/core'
+import { AsyncLock, MAX_CHANNEL_ID } from '@mtcute/core'
 import { isDummyUpdate, isDummyUpdates } from '../utils/updates-utils'
 import { ChatsIndex, UsersIndex } from '../types'
 
@@ -24,7 +23,7 @@ const debug = require('debug')('mtcute:upds')
 
 // @extension
 interface UpdatesState {
-    _updLock: Lock
+    _updLock: AsyncLock
 
     // accessing storage every time might be expensive,
     // so store everything here, and load & save
@@ -37,7 +36,7 @@ interface UpdatesState {
 
 // @initialize
 function _initializeUpdates(this: TelegramClient) {
-    this._updLock = new Lock()
+    this._updLock = new AsyncLock()
     // we dont need to initialize state fields since
     // they are always loaded either from the server, or from storage.
 
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index a237545f..9517af95 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -6,6 +6,7 @@ export * from './types'
 export * from './utils/crypto'
 export * from './utils/peer-utils'
 export * from './utils/tl-json'
+export * from './utils/async-lock'
 
 export { BinaryReader } from './utils/binary/binary-reader'
 export { BinaryWriter } from './utils/binary/binary-writer'
diff --git a/packages/client/src/utils/lock.ts b/packages/core/src/utils/async-lock.ts
similarity index 90%
rename from packages/client/src/utils/lock.ts
rename to packages/core/src/utils/async-lock.ts
index 18330ba0..abe3e8d2 100644
--- a/packages/client/src/utils/lock.ts
+++ b/packages/core/src/utils/async-lock.ts
@@ -4,8 +4,11 @@ interface OneWayLinkedList<T> {
     n?: OneWayLinkedList<T>
 }
 
-/** @internal */
-export class Lock {
+/**
+ * Simple class implementing a semaphore like
+ * behaviour.
+ */
+export class AsyncLock {
     private _first?: OneWayLinkedList<LockInfo>
     private _last?: OneWayLinkedList<LockInfo>