diff --git a/scripts/pylib/twister/twisterlib/coverage.py b/scripts/pylib/twister/twisterlib/coverage.py
index 3ae14a50131..3aba6705a8a 100644
--- a/scripts/pylib/twister/twisterlib/coverage.py
+++ b/scripts/pylib/twister/twisterlib/coverage.py
@@ -15,7 +15,6 @@ import sys
 import tempfile
 
 logger = logging.getLogger('twister')
-logger.setLevel(logging.DEBUG)
 
 supported_coverage_formats = {
     "gcovr": ["html", "xml", "csv", "txt", "coveralls", "sonarqube"],
diff --git a/scripts/pylib/twister/twisterlib/environment.py b/scripts/pylib/twister/twisterlib/environment.py
index c833db3b679..1047576d94a 100644
--- a/scripts/pylib/twister/twisterlib/environment.py
+++ b/scripts/pylib/twister/twisterlib/environment.py
@@ -27,7 +27,6 @@ from twisterlib.error import TwisterRuntimeError
 from twisterlib.log_helper import log_command
 
 logger = logging.getLogger('twister')
-logger.setLevel(logging.DEBUG)
 
 ZEPHYR_BASE = os.getenv("ZEPHYR_BASE")
 if not ZEPHYR_BASE:
diff --git a/scripts/pylib/twister/twisterlib/error.py b/scripts/pylib/twister/twisterlib/error.py
index 26180653a95..7a88a5d9d54 100644
--- a/scripts/pylib/twister/twisterlib/error.py
+++ b/scripts/pylib/twister/twisterlib/error.py
@@ -6,7 +6,7 @@ import logging
 import traceback
 
 logger = logging.getLogger('twister')
-logger.setLevel(logging.DEBUG)
+
 
 class TwisterException(Exception):
     def __init__(self, message="TwisterException"):
diff --git a/scripts/pylib/twister/twisterlib/handlers.py b/scripts/pylib/twister/twisterlib/handlers.py
index 4a7ecca88eb..dc1ff258935 100755
--- a/scripts/pylib/twister/twisterlib/handlers.py
+++ b/scripts/pylib/twister/twisterlib/handlers.py
@@ -47,7 +47,6 @@ except ImportError as capture_error:
         raise capture_error
 
 logger = logging.getLogger('twister')
-logger.setLevel(logging.DEBUG)
 
 
 def terminate_process(proc):
diff --git a/scripts/pylib/twister/twisterlib/hardwaremap.py b/scripts/pylib/twister/twisterlib/hardwaremap.py
index 1121301c577..d6c3892f260 100644
--- a/scripts/pylib/twister/twisterlib/hardwaremap.py
+++ b/scripts/pylib/twister/twisterlib/hardwaremap.py
@@ -30,7 +30,6 @@ except ImportError:
     print("Install tabulate python module with pip to use --device-testing option.")
 
 logger = logging.getLogger('twister')
-logger.setLevel(logging.DEBUG)
 
 
 class DUT:
diff --git a/scripts/pylib/twister/twisterlib/harness.py b/scripts/pylib/twister/twisterlib/harness.py
index 58fbf5e5dcd..b3e210bc8d7 100644
--- a/scripts/pylib/twister/twisterlib/harness.py
+++ b/scripts/pylib/twister/twisterlib/harness.py
@@ -28,7 +28,6 @@ from twisterlib.statuses import TwisterStatus
 from twisterlib.testinstance import TestInstance
 
 logger = logging.getLogger('twister')
-logger.setLevel(logging.DEBUG)
 
 _WINDOWS = platform.system() == 'Windows'
 
diff --git a/scripts/pylib/twister/twisterlib/jobserver.py b/scripts/pylib/twister/twisterlib/jobserver.py
index f66e6b08db0..cd08eabf0d2 100644
--- a/scripts/pylib/twister/twisterlib/jobserver.py
+++ b/scripts/pylib/twister/twisterlib/jobserver.py
@@ -14,7 +14,7 @@ import subprocess
 import sys
 
 logger = logging.getLogger('twister')
-logger.setLevel(logging.DEBUG)
+
 
 class JobHandle:
     """Small object to handle claim of a job."""
diff --git a/scripts/pylib/twister/twisterlib/log_helper.py b/scripts/pylib/twister/twisterlib/log_helper.py
index e6a2b74c58b..a92d4edacef 100644
--- a/scripts/pylib/twister/twisterlib/log_helper.py
+++ b/scripts/pylib/twister/twisterlib/log_helper.py
@@ -12,6 +12,7 @@ import shlex
 
 _WINDOWS = platform.system() == 'Windows'
 
+
 def log_command(logger, msg, args):
     '''Platform-independent helper for logging subprocess invocations.
     Will log a command string that can be copy/pasted into a POSIX
diff --git a/scripts/pylib/twister/twisterlib/platform.py b/scripts/pylib/twister/twisterlib/platform.py
index f960610ae14..b19f908b915 100644
--- a/scripts/pylib/twister/twisterlib/platform.py
+++ b/scripts/pylib/twister/twisterlib/platform.py
@@ -18,7 +18,6 @@ from twisterlib.constants import SUPPORTED_SIMS
 from twisterlib.environment import ZEPHYR_BASE
 
 logger = logging.getLogger('twister')
-logger.setLevel(logging.DEBUG)
 
 
 class Simulator:
diff --git a/scripts/pylib/twister/twisterlib/reports.py b/scripts/pylib/twister/twisterlib/reports.py
index 8a11097b391..a8fa17d5f93 100644
--- a/scripts/pylib/twister/twisterlib/reports.py
+++ b/scripts/pylib/twister/twisterlib/reports.py
@@ -17,7 +17,6 @@ from colorama import Fore
 from twisterlib.statuses import TwisterStatus
 
 logger = logging.getLogger('twister')
-logger.setLevel(logging.DEBUG)
 
 
 class ReportStatus(str, Enum):
diff --git a/scripts/pylib/twister/twisterlib/runner.py b/scripts/pylib/twister/twisterlib/runner.py
index 5b02e3374d8..5f3fdb06f33 100644
--- a/scripts/pylib/twister/twisterlib/runner.py
+++ b/scripts/pylib/twister/twisterlib/runner.py
@@ -61,7 +61,6 @@ import expr_parser
 from anytree import Node, RenderTree
 
 logger = logging.getLogger('twister')
-logger.setLevel(logging.DEBUG)
 
 
 class ExecutionCounter:
diff --git a/scripts/pylib/twister/twisterlib/size_calc.py b/scripts/pylib/twister/twisterlib/size_calc.py
index 8034dca44ee..00432964ff2 100644
--- a/scripts/pylib/twister/twisterlib/size_calc.py
+++ b/scripts/pylib/twister/twisterlib/size_calc.py
@@ -13,7 +13,7 @@ import sys
 from twisterlib.error import TwisterRuntimeError
 
 logger = logging.getLogger('twister')
-logger.setLevel(logging.DEBUG)
+
 
 class SizeCalculator:
     alloc_sections = [
diff --git a/scripts/pylib/twister/twisterlib/testinstance.py b/scripts/pylib/twister/twisterlib/testinstance.py
index 635866272f2..4da24692592 100644
--- a/scripts/pylib/twister/twisterlib/testinstance.py
+++ b/scripts/pylib/twister/twisterlib/testinstance.py
@@ -36,7 +36,7 @@ from twisterlib.statuses import TwisterStatus
 from twisterlib.testsuite import TestCase, TestSuite
 
 logger = logging.getLogger('twister')
-logger.setLevel(logging.DEBUG)
+
 
 class TestInstance:
     """Class representing the execution of a particular TestSuite on a platform
diff --git a/scripts/pylib/twister/twisterlib/testplan.py b/scripts/pylib/twister/twisterlib/testplan.py
index 098d9047d3b..9a213b1c227 100755
--- a/scripts/pylib/twister/twisterlib/testplan.py
+++ b/scripts/pylib/twister/twisterlib/testplan.py
@@ -38,7 +38,6 @@ from twisterlib.testsuite import TestSuite, scan_testsuite_path
 from zephyr_module import parse_modules
 
 logger = logging.getLogger('twister')
-logger.setLevel(logging.DEBUG)
 
 ZEPHYR_BASE = os.getenv("ZEPHYR_BASE")
 if not ZEPHYR_BASE:
diff --git a/scripts/pylib/twister/twisterlib/testsuite.py b/scripts/pylib/twister/twisterlib/testsuite.py
index a99e9c88e09..5d4f346effc 100644
--- a/scripts/pylib/twister/twisterlib/testsuite.py
+++ b/scripts/pylib/twister/twisterlib/testsuite.py
@@ -18,7 +18,6 @@ from twisterlib.mixins import DisablePyTestCollectionMixin
 from twisterlib.statuses import TwisterStatus
 
 logger = logging.getLogger('twister')
-logger.setLevel(logging.DEBUG)
 
 class ScanPathResult:
     """Result of the scan_tesuite_path function call.
diff --git a/scripts/tests/twister/conftest.py b/scripts/tests/twister/conftest.py
index 7c91be6ffc5..f45e596f5a0 100644
--- a/scripts/tests/twister/conftest.py
+++ b/scripts/tests/twister/conftest.py
@@ -4,12 +4,13 @@
 # SPDX-License-Identifier: Apache-2.0
 
 '''Common fixtures for use in testing the twister tool.'''
-
+import logging
 import os
 import sys
 import pytest
 
 pytest_plugins = ["pytester"]
+logging.getLogger("twister").setLevel(logging.DEBUG)  # requires for testing twister
 
 ZEPHYR_BASE = os.getenv("ZEPHYR_BASE")
 sys.path.insert(0, os.path.join(ZEPHYR_BASE, "scripts/pylib/twister"))
diff --git a/scripts/tests/twister_blackbox/conftest.py b/scripts/tests/twister_blackbox/conftest.py
index 609bb800812..0fd73927c6f 100644
--- a/scripts/tests/twister_blackbox/conftest.py
+++ b/scripts/tests/twister_blackbox/conftest.py
@@ -12,6 +12,8 @@ import os
 import pytest
 import sys
 
+logging.getLogger("twister").setLevel("DEBUG")  # requires for testing twister
+
 ZEPHYR_BASE = os.getenv('ZEPHYR_BASE')
 TEST_DATA = os.path.join(ZEPHYR_BASE, 'scripts', 'tests',
                         'twister_blackbox', 'test_data')