diff --git a/src/rtmt/rtmt_websocket.ts b/src/rtmt/rtmt_websocket.ts
index c984d40..3f93536 100644
--- a/src/rtmt/rtmt_websocket.ts
+++ b/src/rtmt/rtmt_websocket.ts
@@ -3,7 +3,7 @@ import { Bytes, OnMessage, RTMT } from "./rtmt";
 import { server } from "../service/http_service";
 import { channel_ping, channel_pong } from "../const/channel_names";
 
-const PING_INTERVAL = 3000, PING_INTERVAL_BUFFER_TIME = 500;
+const PING_INTERVAL = 15000, PING_INTERVAL_BUFFER_TIME = 1000;
 
 export class RTMTWS implements RTMT {
   private messageChannels: Map<String, OnMessage>;