diff --git a/pyproject.toml b/pyproject.toml
index 9bbadd00..505fe38c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -73,7 +73,7 @@ mss = "mss.__main__:main"
 dev = [
   "build==1.3.0",
   "mypy==1.17.1",
-  "ruff==0.11.11",
+  "ruff==0.12.9",
   "twine==6.1.0",
 ]
 docs = [
diff --git a/src/mss/factory.py b/src/mss/factory.py
index b0793e8c..29cb3ed1 100644
--- a/src/mss/factory.py
+++ b/src/mss/factory.py
@@ -22,17 +22,17 @@ def mss(**kwargs: Any) -> MSSBase:
     os_ = platform.system().lower()
 
     if os_ == "darwin":
-        from mss import darwin
+        from mss import darwin  # noqa: PLC0415
 
         return darwin.MSS(**kwargs)
 
     if os_ == "linux":
-        from mss import linux
+        from mss import linux  # noqa: PLC0415
 
         return linux.MSS(**kwargs)
 
     if os_ == "windows":
-        from mss import windows
+        from mss import windows  # noqa: PLC0415
 
         return windows.MSS(**kwargs)
 
diff --git a/src/tests/test_implementation.py b/src/tests/test_implementation.py
index 294ccc80..84d8594f 100644
--- a/src/tests/test_implementation.py
+++ b/src/tests/test_implementation.py
@@ -5,9 +5,10 @@
 from __future__ import annotations
 
 import os
-import os.path
 import platform
 import sys
+import threading
+import time
 from datetime import datetime
 from pathlib import Path
 from typing import TYPE_CHECKING
@@ -16,7 +17,6 @@
 import pytest
 
 import mss
-import mss.tools
 from mss.__main__ import main as entry_point
 from mss.base import MSSBase
 from mss.exception import ScreenShotError
@@ -237,8 +237,6 @@ def test_grab_with_tuple_percents() -> None:
 
 def test_thread_safety() -> None:
     """Regression test for issue #169."""
-    import threading
-    import time
 
     def record(check: dict) -> None:
         """Record for one second."""
diff --git a/src/tests/test_leaks.py b/src/tests/test_leaks.py
index f27e7f77..7e04fb34 100644
--- a/src/tests/test_leaks.py
+++ b/src/tests/test_leaks.py
@@ -2,8 +2,10 @@
 Source: https://github.com/BoboTiG/python-mss.
 """
 
+import ctypes
 import os
 import platform
+import subprocess
 from collections.abc import Callable
 
 import pytest
@@ -18,8 +20,6 @@ def get_opened_socket() -> int:
     """GNU/Linux: a way to get the opened sockets count.
     It will be used to check X server connections are well closed.
     """
-    import subprocess
-
     cmd = f"lsof -U | grep {PID}"
     output = subprocess.check_output(cmd, shell=True)
     return len(output.splitlines())
@@ -29,8 +29,6 @@ def get_handles() -> int:
     """Windows: a way to get the GDI handles count.
     It will be used to check the handles count is not growing, showing resource leaks.
     """
-    import ctypes
-
     PROCESS_QUERY_INFORMATION = 0x400  # noqa:N806
     GR_GDIOBJECTS = 0  # noqa:N806
     h = ctypes.windll.kernel32.OpenProcess(PROCESS_QUERY_INFORMATION, 0, PID)
diff --git a/src/tests/test_setup.py b/src/tests/test_setup.py
index d4788677..da55637c 100644
--- a/src/tests/test_setup.py
+++ b/src/tests/test_setup.py
@@ -17,9 +17,9 @@
 pytest.importorskip("build")
 pytest.importorskip("twine")
 
-SDIST = "python -m build --sdist".split()
-WHEEL = "python -m build --wheel".split()
-CHECK = "twine check --strict".split()
+SDIST = ["python", "-m", "build", "--sdist"]
+WHEEL = ["python", "-m", "build", "--wheel"]
+CHECK = ["twine", "check", "--strict"]
 
 
 def test_sdist() -> None: