diff --git a/src/pfs_target_uploader/pn_app.py b/src/pfs_target_uploader/pn_app.py
index 8110401..aee9d8e 100644
--- a/src/pfs_target_uploader/pn_app.py
+++ b/src/pfs_target_uploader/pn_app.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 
 import os
+import sys
 from datetime import datetime, timezone
 
 import gurobipy
@@ -38,11 +39,17 @@ def _toggle_widgets(widgets: list, disabled: bool = True):
 def target_uploader_app(use_panel_cli=False):
     pn.state.notifications.position = "bottom-left"
 
+    config = dotenv_values(".env.shared")
+
+    # configure logger to be multiprocessing-safe
+    log_level = config["LOG_LEVEL"] if "LOG_LEVEL" in config.keys() else "INFO"
+    logger.info(f"Log level is set to {log_level}")
+    logger.remove()
+    logger.add(sys.stderr, level=log_level, enqueue=True)
+
     logger.info(f"{pn.state.headers=}")
     logger.info(f"{pn.state.location.href=}")
 
-    config = dotenv_values(".env.shared")
-
     if "MAX_EXETIME" not in config.keys():
         max_exetime: int = 900
     else:
@@ -434,6 +441,7 @@ def cb_PPP(event):
                 clustering_algorithm=clustering_algorithm,
                 quiet=ppp_quiet,
                 max_exetime=max_exetime,
+                logger=logger,
             )
 
             panel_ppp.show_results()
diff --git a/src/pfs_target_uploader/utils/ppp.py b/src/pfs_target_uploader/utils/ppp.py
index 297209b..1535efa 100644
--- a/src/pfs_target_uploader/utils/ppp.py
+++ b/src/pfs_target_uploader/utils/ppp.py
@@ -55,7 +55,12 @@ def PPPrunStart(
     quiet=True,
     clustering_algorithm="HDBSCAN",
     queue=None,
+    logger=None,
 ):
+    if logger is None:
+        logger.remove()
+        logger.add(sys.stderr, level="INFO", enqueue=True)
+
     r_pfi = d_pfi / 2.0
 
     ppp_quiet = quiet
diff --git a/src/pfs_target_uploader/widgets/PppResultWidgets.py b/src/pfs_target_uploader/widgets/PppResultWidgets.py
index 7c9a427..db5527c 100644
--- a/src/pfs_target_uploader/widgets/PppResultWidgets.py
+++ b/src/pfs_target_uploader/widgets/PppResultWidgets.py
@@ -1,8 +1,8 @@
 #!/usr/bin/env python3
 
+import multiprocessing as mp
 import sys
 
-import multiprocessing as mp
 import numpy as np
 import panel as pn
 from astropy import units as u
@@ -55,7 +55,7 @@ def __init__(
 
         self.ppp_error_text_2 = (
             "<font size=5>⚠️ **Error**</font>\n\n"
-            f"<font size=3>Calculation stops because time is running out. "
+            "<font size=3>Calculation stops because time is running out. "
             "If you would get the complete outputs, please modify the input list or consult with the observatory. </font>"
         )
 
@@ -273,7 +273,12 @@ def run_ppp(
         clustering_algorithm="HDBSCAN",
         quiet=True,
         max_exetime=900,
+        logger=None,
     ):
+        if logger is None:
+            logger.remove()
+            logger.add(sys.stderr, level="INFO", enqueue=True)
+
         if weights is None:
             weights = [2.02, 0.01, 0.01]
 
@@ -304,6 +309,7 @@ def run_ppp(
                 quiet,
                 clustering_algorithm,
                 ppp_run_results,
+                logger,
             ),
         )