diff --git a/text/pyopenjtalk_worker/__init__.py b/text/pyopenjtalk_worker/__init__.py
index 6ab4ca1..ef5873c 100644
--- a/text/pyopenjtalk_worker/__init__.py
+++ b/text/pyopenjtalk_worker/__init__.py
@@ -64,7 +64,7 @@ def initialize(port: int = WOKER_PORT):
     try:
         client = WorkerClient(port)
     except (socket.timeout, socket.error):
-        logger.debug("try starting worker server")
+        logger.debug("try starting pyopenjtalk worker server")
         import os
         import subprocess
 
diff --git a/text/pyopenjtalk_worker/worker_client.py b/text/pyopenjtalk_worker/worker_client.py
index bd9a32a..23f7dbe 100644
--- a/text/pyopenjtalk_worker/worker_client.py
+++ b/text/pyopenjtalk_worker/worker_client.py
@@ -3,6 +3,8 @@ import socket
 
 from .worker_common import RequestType, receive_data, send_data
 
+from common.log import logger
+
 
 class WorkerClient:
     def __init__(self, port: int) -> None:
@@ -28,8 +30,12 @@ class WorkerClient:
             "args": args,
             "kwargs": kwargs,
         }
+        logger.trace(f"client sends request: {data}")
         send_data(self.sock, data)
-        return receive_data(self.sock).get("return")
+        logger.trace("client sent request successfully")
+        response = receive_data(self.sock)
+        logger.trace(f"client received response: {response}")
+        return response.get("return")
 
     def status(self):
         send_data(self.sock, {"request-type": RequestType.STATUS})
diff --git a/text/pyopenjtalk_worker/worker_server.py b/text/pyopenjtalk_worker/worker_server.py
index a2b9f2f..13bc771 100644
--- a/text/pyopenjtalk_worker/worker_server.py
+++ b/text/pyopenjtalk_worker/worker_server.py
@@ -2,7 +2,6 @@ import pyopenjtalk
 import socket
 import select
 
-
 from .worker_common import (
     ConnectionClosedException,
     RequestType,
@@ -88,12 +87,13 @@ class WorkerServer:
                             logger.info("close connection")
                             continue
 
-                        logger.debug(f"receive request: {request}")
+                        logger.trace(f"server received request: {request}")
 
                         response = self.handle_request(request)
-                        logger.debug(f"send response: {response}")
+                        logger.trace(f"server sends response: {response}")
                         try:
                             send_data(sock, response)
+                            logger.trace("server sent response successfully")
                         except Exception:
                             logger.warning(
                                 "an exception occurred during sending responce"