diff --git a/bin/tests/system/isctest/log/basic.py b/bin/tests/system/isctest/log/basic.py
index 89201f61c7..762741f571 100644
--- a/bin/tests/system/isctest/log/basic.py
+++ b/bin/tests/system/isctest/log/basic.py
@@ -10,7 +10,6 @@
 # information regarding copyright ownership.
 
 from pathlib import Path
-from typing import Dict, Optional
 
 import logging
 import textwrap
diff --git a/bin/tests/system/nsec3/tests_nsec3_change.py b/bin/tests/system/nsec3/tests_nsec3_change.py
index 195925092a..c8d2dcd42c 100644
--- a/bin/tests/system/nsec3/tests_nsec3_change.py
+++ b/bin/tests/system/nsec3/tests_nsec3_change.py
@@ -11,7 +11,6 @@
 
 # pylint: disable=redefined-outer-name,unused-import
 
-import os
 import shutil
 import time
 
@@ -19,8 +18,8 @@ import dns
 import dns.update
 import pytest
 
-from isctest.vars.algorithms import RSASHA1, Algorithm
-from nsec3.common import NSEC3_MARK, check_nsec3_case, default_config
+from isctest.vars.algorithms import Algorithm
+from nsec3.common import NSEC3_MARK, check_nsec3_case
 
 import isctest
 import isctest.mark
diff --git a/bin/tests/system/nsec3/tests_nsec3_initial.py b/bin/tests/system/nsec3/tests_nsec3_initial.py
index ce95260f60..aacdfbb435 100644
--- a/bin/tests/system/nsec3/tests_nsec3_initial.py
+++ b/bin/tests/system/nsec3/tests_nsec3_initial.py
@@ -18,7 +18,7 @@ import dns.update
 import pytest
 
 from isctest.vars.algorithms import RSASHA1, Algorithm
-from nsec3.common import NSEC3_MARK, check_nsec3_case, default_config
+from nsec3.common import NSEC3_MARK, check_nsec3_case
 
 import isctest
 import isctest.mark
diff --git a/bin/tests/system/nsec3/tests_nsec3_reconfig.py b/bin/tests/system/nsec3/tests_nsec3_reconfig.py
index 6cf85d6566..e9aa7a6fd4 100644
--- a/bin/tests/system/nsec3/tests_nsec3_reconfig.py
+++ b/bin/tests/system/nsec3/tests_nsec3_reconfig.py
@@ -12,7 +12,6 @@
 # pylint: disable=redefined-outer-name,unused-import
 
 import os
-import shutil
 import time
 
 import dns
@@ -20,7 +19,7 @@ import dns.update
 import pytest
 
 from isctest.vars.algorithms import RSASHA1, Algorithm
-from nsec3.common import NSEC3_MARK, check_nsec3_case, default_config
+from nsec3.common import NSEC3_MARK, check_nsec3_case
 
 import isctest
 import isctest.mark
diff --git a/bin/tests/system/nsec3/tests_nsec3_reload.py b/bin/tests/system/nsec3/tests_nsec3_reload.py
index bd720c87f1..920a84c311 100644
--- a/bin/tests/system/nsec3/tests_nsec3_reload.py
+++ b/bin/tests/system/nsec3/tests_nsec3_reload.py
@@ -11,12 +11,7 @@
 
 # pylint: disable=redefined-outer-name,unused-import
 
-import os
 import shutil
-import time
-
-import dns
-import pytest
 
 from nsec3.common import NSEC3_MARK, check_nsec3_case
 
diff --git a/bin/tests/system/nsec3/tests_nsec3_restart.py b/bin/tests/system/nsec3/tests_nsec3_restart.py
index 85913c34e0..50b67aaef4 100644
--- a/bin/tests/system/nsec3/tests_nsec3_restart.py
+++ b/bin/tests/system/nsec3/tests_nsec3_restart.py
@@ -18,7 +18,7 @@ import dns.update
 import pytest
 
 from isctest.vars.algorithms import Algorithm
-from nsec3.common import NSEC3_MARK, check_nsec3_case, check_nsec3param, default_config
+from nsec3.common import NSEC3_MARK, check_nsec3_case, check_nsec3param
 
 import isctest
 import isctest.mark
diff --git a/bin/tests/system/nsec3/tests_nsec3_retransfer.py b/bin/tests/system/nsec3/tests_nsec3_retransfer.py
index 0651ecf5ad..83c4275ecb 100644
--- a/bin/tests/system/nsec3/tests_nsec3_retransfer.py
+++ b/bin/tests/system/nsec3/tests_nsec3_retransfer.py
@@ -14,11 +14,9 @@
 from datetime import timedelta
 
 import os
-import shutil
 
 import dns
 import dns.update
-import pytest
 
 from isctest.vars.algorithms import RSASHA256
 from nsec3.common import NSEC3_MARK, check_auth_nsec3, check_nsec3param
diff --git a/bin/tests/system/rollover-multisigner/tests_rollover_multisigner.py b/bin/tests/system/rollover-multisigner/tests_rollover_multisigner.py
index d59e005c6d..f1ec60bec2 100644
--- a/bin/tests/system/rollover-multisigner/tests_rollover_multisigner.py
+++ b/bin/tests/system/rollover-multisigner/tests_rollover_multisigner.py
@@ -17,7 +17,6 @@ import os
 
 import dns
 import dns.update
-import pytest
 
 from isctest.kasp import Iret
 from isctest.run import EnvCmd
diff --git a/pyproject.toml b/pyproject.toml
index 6a8dc81bbe..51beb6bef8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -92,6 +92,8 @@ target-version = "py310"
 lint.select = [
   # import order
   "I",
+  # unused imports
+  "F401",
   # sorted __all__
   "RUF022",
   # f-strings