diff --git a/climax/main/downscale_bootstrap.py b/climax/main/downscale_bootstrap.py
index 53116b4baa459dab88a7a4f59ca9a1666efdf767..36a0d47e2c5eb859b85f6285b4e6335fff405c8c 100644
--- a/climax/main/downscale_bootstrap.py
+++ b/climax/main/downscale_bootstrap.py
@@ -4,7 +4,6 @@
 # -*- coding: utf-8 -*-
 
 # builtins
-import sys
 import time
 import logging
 from datetime import timedelta
@@ -29,9 +28,9 @@ from climax.main.config import (ERA5_PLEVELS, ERA5_PREDICTORS, PREDICTAND,
                                 NORM, TRAIN_CONFIG, NET, LOSS, FILTERS,
                                 OVERWRITE, DEM, DEM_FEATURES, STRATIFY,
                                 WET_DAY_THRESHOLD, VALID_SIZE, ANOMALIES,
-                                OPTIM_PARAMS, LR_SCHEDULER, SENSITIVITY,
-                                LR_SCHEDULER_PARAMS, CHUNKS, VALID_PERIOD,
-                                NYEARS, BOOTSTRAP)
+                                OPTIM_PARAMS, LR_SCHEDULER, CHUNKS,
+                                VALID_PERIOD, LR_SCHEDULER_PARAMS, NYEARS,
+                                BOOTSTRAP)
 from climax.main.io import (ERA5_PATH, OBS_PATH, DEM_PATH, MODEL_PATH,
                             TARGET_PATH)