diff --git a/package-lock.json b/package-lock.json
index 34c5f81..e9c6d34 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "bybit-api",
-  "version": "4.0.0-beta.1",
+  "version": "4.0.0-beta.2",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "bybit-api",
-      "version": "4.0.0-beta.1",
+      "version": "4.0.0-beta.2",
       "license": "MIT",
       "dependencies": {
         "axios": "^1.7.9",
diff --git a/package.json b/package.json
index 83b6a1f..53cf797 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "bybit-api",
-  "version": "4.0.0-beta.1",
+  "version": "4.0.0-beta.2",
   "description": "Complete & robust Node.js SDK for Bybit's REST APIs and WebSockets, with TypeScript & strong end to end tests.",
   "main": "lib/index.js",
   "types": "lib/index.d.ts",
diff --git a/src/websocket-client.ts b/src/websocket-client.ts
index d26df78..c19de74 100644
--- a/src/websocket-client.ts
+++ b/src/websocket-client.ts
@@ -555,7 +555,7 @@ export class WebsocketClient extends BaseWebsocketClient<
         // Previously used to track topics in a request. Keeping this for subscribe/unsubscribe requests, no need for incremental values
         const req_id =
           ['subscribe', 'unsubscribe'].includes(operation) && topics.length
-            ? topics.join('_')
+            ? topics.join(',')
             : this.getNewRequestId();
 
         const wsEvent: WsRequestOperationBybit<WsTopic> = {