diff --git a/src/types/ws-events/failed-topic-subscription-confirmation.ts b/src/types/ws-events/failed-topic-subscription-confirmation.ts
new file mode 100644
index 0000000..c8b95d6
--- /dev/null
+++ b/src/types/ws-events/failed-topic-subscription-confirmation.ts
@@ -0,0 +1,6 @@
+import { WebsocketTopicSubscriptionConfirmationEvent } from './topic-subscription-confirmation';
+
+export interface WebsocketFailedTopicSubscriptionConfirmationEvent
+  extends WebsocketTopicSubscriptionConfirmationEvent {
+  success: false;
+}
diff --git a/src/types/ws-events/succeeded-topic-subscription-confirmation.ts b/src/types/ws-events/succeeded-topic-subscription-confirmation.ts
new file mode 100644
index 0000000..0fc5990
--- /dev/null
+++ b/src/types/ws-events/succeeded-topic-subscription-confirmation.ts
@@ -0,0 +1,6 @@
+import { WebsocketTopicSubscriptionConfirmationEvent } from './topic-subscription-confirmation';
+
+export interface WebsocketSucceededTopicSubscriptionConfirmationEvent
+  extends WebsocketTopicSubscriptionConfirmationEvent {
+  success: true;
+}
diff --git a/src/types/ws-events/topic-subscription-confirmation.ts b/src/types/ws-events/topic-subscription-confirmation.ts
new file mode 100644
index 0000000..542e63d
--- /dev/null
+++ b/src/types/ws-events/topic-subscription-confirmation.ts
@@ -0,0 +1,7 @@
+export interface WebsocketTopicSubscriptionConfirmationEvent {
+  op: 'subscribe';
+  req_id: string;
+  conn_id: string;
+  ret_msg: string;
+  success: boolean;
+}
diff --git a/src/util/requestUtils.ts b/src/util/requestUtils.ts
index 62c3128..8699ab6 100644
--- a/src/util/requestUtils.ts
+++ b/src/util/requestUtils.ts
@@ -1,3 +1,6 @@
+import { WebsocketSucceededTopicSubscriptionConfirmationEvent } from '../types/ws-events/succeeded-topic-subscription-confirmation';
+import { WebsocketTopicSubscriptionConfirmationEvent } from '../types/ws-events/topic-subscription-confirmation';
+
 export interface RestClientOptions {
   /** Your API key */
   key?: string;
@@ -57,7 +60,7 @@ export function serializeParams(
   params: object = {},
   strict_validation = false,
   sortProperties = true,
-  encodeSerialisedValues = true
+  encodeSerialisedValues = true,
 ): string {
   const properties = sortProperties
     ? Object.keys(params).sort()
@@ -71,7 +74,7 @@ export function serializeParams(
 
       if (strict_validation === true && typeof value === 'undefined') {
         throw new Error(
-          'Failed to sign API request due to undefined parameter'
+          'Failed to sign API request due to undefined parameter',
         );
       }
       return `${key}=${value}`;
@@ -81,7 +84,7 @@ export function serializeParams(
 
 export function getRestBaseUrl(
   useTestnet: boolean,
-  restInverseOptions: RestClientOptions
+  restInverseOptions: RestClientOptions,
 ): string {
   const exchangeBaseUrls = {
     livenet: 'https://api.bybit.com',
@@ -124,30 +127,30 @@ export function isWsPong(msg: any): boolean {
   );
 }
 
-// eslint-disable-next-line @typescript-eslint/no-explicit-any
-export function isTopicSubscriptionConfirmation(msg: any): boolean {
+export function isTopicSubscriptionConfirmation(
+  msg: unknown,
+): msg is WebsocketTopicSubscriptionConfirmationEvent {
+  if (typeof msg !== 'object') {
+    return false;
+  }
   if (!msg) {
     return false;
   }
-
-  if (!msg['op'] || msg['op'] !== 'subscribe') {
+  if (typeof msg['op'] !== 'string') {
+    return false;
+  }
+  if (msg['op'] !== 'subscribe') {
     return false;
   }
 
   return true;
 }
 
-// eslint-disable-next-line @typescript-eslint/no-explicit-any
-export function isTopicSubscriptionSuccess(msg: any): boolean {
-  if (!msg) {
-    return false;
-  }
-
-  if (!msg['op'] || msg['op'] !== 'subscribe') {
-    return false;
-  }
-
-  return msg['success'] === true;
+export function isTopicSubscriptionSuccess(
+  msg: unknown,
+): msg is WebsocketSucceededTopicSubscriptionConfirmationEvent {
+  if (!isTopicSubscriptionConfirmation(msg)) return false;
+  return msg.success === true;
 }
 
 export const APIID = 'bybitapinode';
@@ -165,4 +168,4 @@ export const REST_CLIENT_TYPE_ENUM = {
 } as const;
 
 export type RestClientType =
-  typeof REST_CLIENT_TYPE_ENUM[keyof typeof REST_CLIENT_TYPE_ENUM];
+  (typeof REST_CLIENT_TYPE_ENUM)[keyof typeof REST_CLIENT_TYPE_ENUM];
diff --git a/src/websocket-client.ts b/src/websocket-client.ts
index 53128a9..3ecaa96 100644
--- a/src/websocket-client.ts
+++ b/src/websocket-client.ts
@@ -43,6 +43,7 @@ import {
   serializeParams,
 } from './util';
 import { RestClientV5 } from './rest-client-v5';
+import { WebsocketTopicSubscriptionConfirmationEvent } from './types/ws-events/topic-subscription-confirmation';
 
 const loggerCategory = { category: 'bybit-ws' };
 
@@ -1069,20 +1070,19 @@ export class WebsocketClient extends EventEmitter {
     }
   }
 
-  private updatePendingTopicSubscriptionStatus(wsKey: string, msg: any) {
-    const requestsIds = msg['req_id'] as string;
+  private updatePendingTopicSubscriptionStatus(
+    wsKey: string,
+    msg: WebsocketTopicSubscriptionConfirmationEvent,
+  ) {
+    const requestsIds = msg.req_id as string;
     const pendingTopicsSubscriptions = this.pendingTopicsSubscriptions.find(
       (s) => s.wsKey === wsKey,
     );
-    if (!pendingTopicsSubscriptions) {
-      throw new Error(
-        `Could not find "${wsKey}" within pending topics subscriptions.`,
-      );
-    }
 
-    const subscriptionSuccess = isTopicSubscriptionSuccess(msg);
+    if (!pendingTopicsSubscriptions) return;
+
     const splitRequestsIds = requestsIds.split(',');
-    if (!subscriptionSuccess) {
+    if (!isTopicSubscriptionSuccess(msg)) {
       splitRequestsIds.forEach((req_id) =>
         pendingTopicsSubscriptions.failedTopicsSubscriptions.add(req_id),
       );
diff --git a/test/v5/public.ws.test.ts b/test/v5/public.ws.test.ts
index 69c4ed2..13954a6 100644
--- a/test/v5/public.ws.test.ts
+++ b/test/v5/public.ws.test.ts
@@ -20,7 +20,7 @@ describe('Public V5 Websocket client', () => {
         await api.subscribeV5(`publicTrade.${linearSymbol}X`, linearCategory);
       } catch (e) {
         expect(e).toBeDefined();
-        expect(e).toMatch('(publicTrade.BTCUSDTX) failed to subscribe');
+        expect(e).toMatch('(publicTrade.BTCUSDT) failed to subscribe');
       }
     });
   });