diff --git a/shogi-ai/util/common.py b/shogi-ai/util/common.py
index 2a3b290..aea598d 100644
--- a/shogi-ai/util/common.py
+++ b/shogi-ai/util/common.py
@@ -24,7 +24,7 @@ def get_logger(name: str) -> logging.Logger:
         logdir.mkdir()
 
     form = "%(asctime)s.%(msecs)03d - %(name)s - %(levelname)s - %(message)s"
-    time = datetime.now().strftime("%Y%m%d.%H%M%S.%f")
+    time = datetime.now().strftime("%Y%m%d.%H%M%S")
     logging.basicConfig(
         filename=f"{logdir}/{name}.{time}.log",
         level=logging.INFO,
diff --git a/shogi-ai/util/multiproc.py b/shogi-ai/util/multiproc.py
index 52649ba..b5b4664 100644
--- a/shogi-ai/util/multiproc.py
+++ b/shogi-ai/util/multiproc.py
@@ -15,14 +15,13 @@
 """
 
 import concurrent.futures
+import multiprocessing
 import os
 from concurrent.futures import Future, ProcessPoolExecutor
 from functools import partial
 from typing import Any, Callable, List
 
-from util.common import get_logger
-
-logger = get_logger(__name__)
+logger = multiprocessing.get_logger()
 
 
 class MultiProcManager: