diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 69d71cb8c..4271498bb 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -20,9 +20,9 @@ jobs:
       MOLER_DEBUG_THREADS: True
       PYTHON_COVERAGE: '3.14'
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
       - name: Set up Python ${{ matrix.os }} ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
@@ -95,11 +95,11 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-        python-version: [3.14]
+        python-version: ["3.14"]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
       - name: Set up Python ${{ matrix.os }} ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 7a5bb9fc9..000000000
--- a/.travis.yml
+++ /dev/null
@@ -1,54 +0,0 @@
-language: python
-dist: bionic
-matrix:
-  include:
-    - python: 2.7.17
-    - python: 3.6.10
-    - python: 3.7.3
-    - python: 3.8.1
-
-before_install:
-  - sudo apt-get -y install sshpass
-
-install:
-  - pip install -U pip
-  - pip install -U pycodestyle coveralls pytest pytest-mccabe pytest-random
-  - if [[ $TRAVIS_PYTHON_VERSION == *"3."* ]]; then pip install -U pytest-asyncio; fi
-  - pip install -Ur requirements.txt
-
-before_script:
-  - python -V
-  - cat /etc/passwd | grep home
-  - sudo useradd molerssh -c MolerSshTest -s /bin/bash -l -m -p `python3 -c 'import crypt; print(crypt.crypt("moler_password", "mr"))'`
-  - sudo useradd sshproxy -c Proxy4SshTest -s /bin/bash -l -m -p `python3 -c 'import crypt; print(crypt.crypt("proxy_password", "mr"))'`
-  - sudo useradd adbshell -c AdbShell4SshTest -s /bin/bash -l -m -p `python3 -c 'import crypt; print(crypt.crypt("adb_password", "mr"))'`
-  - cat /etc/passwd | grep home
-  - which scp
-  - sshpass -p moler_password ssh -oStrictHostKeyChecking=no molerssh@localhost pwd
-  - sshpass -p proxy_password ssh -oStrictHostKeyChecking=no sshproxy@localhost pwd
-  - sshpass -p adb_password ssh -oStrictHostKeyChecking=no adbshell@localhost pwd
-  - sshpass -p moler_password scp adb_simulation.sh molerssh@localhost:/home/molerssh/adb_simulation.sh
-  - sshpass -p moler_password ssh molerssh@localhost 'chmod +x ~/adb_simulation.sh'
-  - sshpass -p moler_password ssh molerssh@localhost 'echo "alias adb=~/adb_simulation.sh" >> ~/.profile'
-
-
-script:
-  - python -m pycodestyle --statistics --count moler
-  - if [[ $TRAVIS_PYTHON_VERSION == *"2.7"* ]]; then python -m pytest --random -s -vv test; fi
-  - if [[ $TRAVIS_PYTHON_VERSION == *"3.6"* ]]; then python -m pytest -c py3pytest.ini --random --mccabe -s -vv; fi
-  - if [[ $TRAVIS_PYTHON_VERSION == *"3.7"* ]]; then coverage run -m pytest -c py3pytest.ini --random --mccabe -s -vv; fi
-  - if [[ $TRAVIS_PYTHON_VERSION == *"3.8"* ]]; then python -m pytest --mccabe -s -vv moler; fi
-
-
-after_success:
-  - if [[ $TRAVIS_PYTHON_VERSION == *"3.7"* ]]; then coveralls; fi
-  - sudo userdel --remove --force molerssh
-  - cat /etc/passwd | grep home
-
-after_failure:
-  - echo "----------------------- LOGS -----------------------"
-  - whoami
-  - pwd
-  - ls -lah *.log
-  - export LINE='------------------------------------------------------------------------------------------------'
-  - for log in `ls -1 *.log`; do echo $LINE; echo ---; echo --- $log; echo ---; echo $LINE; cat $log; done
diff --git a/moler/asyncio_runner.py b/moler/asyncio_runner.py
index 87710a4cb..49cce705d 100644
--- a/moler/asyncio_runner.py
+++ b/moler/asyncio_runner.py
@@ -35,23 +35,22 @@
 
 
 current_process = psutil.Process()
-if platform.system() == 'Linux':
-
-    # Check if RLIMIT_NOFILE is available in your psutil
-    # noinspection PyUnresolvedReferences
-    (max_open_files_limit_soft, max_open_files_limit_hard) = current_process.rlimit(psutil.RLIMIT_NOFILE)
-else:
+if platform.system() == 'Windows':
     # https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/setmaxstdio?view=vs-2019
     (max_open_files_limit_soft, max_open_files_limit_hard) = (510, 512)  # TODO: any way on Win?
+else:
+    # Unix (Linux, Darwin, BSD, ...): read the real RLIMIT_NOFILE via stdlib resource module.
+    import resource
+    (max_open_files_limit_soft, max_open_files_limit_hard) = resource.getrlimit(resource.RLIMIT_NOFILE)
 
 
 def system_resources_usage():
-    if platform.system() == 'Linux':
-        curr_fds_open = current_process.num_fds()
-    else:
+    if platform.system() == 'Windows':
         ofiles = current_process.open_files()
         osockets = current_process.connections(kind="all")
         curr_fds_open = len(ofiles) + len(osockets)  # TODO: any better way on Win?
+    else:
+        curr_fds_open = current_process.num_fds()
     curr_threads_nb = threading.active_count()
     return curr_fds_open, curr_threads_nb
 
diff --git a/moler/config/loggers.py b/moler/config/loggers.py
index a199d8626..4a18b2a00 100644
--- a/moler/config/loggers.py
+++ b/moler/config/loggers.py
@@ -290,6 +290,25 @@ def change_logging_suffix(suffix=None, logger_name=None):
     )
 
 
+def _is_foreign_file_handler(handler):
+    """
+    Tell whether a FileHandler was not created by Moler and must not be reopened.
+
+    Other libraries (e.g. pytest, since its 9.0 logging change) attach their own
+    FileHandlers to Moler's non-propagating loggers. pytest's default handler points
+    to os.devnull ('/dev/null'); reopening it with a Moler suffix/path would yield an
+    unwritable path like '/dev/null.suffix' and raise PermissionError. Such handlers
+    are owned by the other library, so Moler should leave them untouched.
+
+    :param handler: logging.FileHandler to inspect.
+    :return: True if the handler points to os.devnull and should be skipped.
+    """
+    try:
+        return os.path.abspath(handler.baseFilename) == os.path.abspath(os.devnull)
+    except (AttributeError, TypeError):
+        return False
+
+
 def _reopen_all_logfiles_with_new_suffix(logger_suffixes, new_suffix, logger_name):
     """
     Reopen all log files with new suffix.
@@ -308,6 +327,8 @@ def _reopen_all_logfiles_with_new_suffix(logger_suffixes, new_suffix, logger_nam
         written_to_log = False
         for handler in logger_handlers:
             if isinstance(handler, logging.FileHandler):
+                if _is_foreign_file_handler(handler):
+                    continue
                 new_log_full_path = _get_new_filepath_with_suffix(
                     old_path=handler.baseFilename,
                     old_suffix=old_suffix,
@@ -367,6 +388,8 @@ def _reopen_all_logfiles_in_new_path(old_logging_path, new_logging_path):
 
         for handler in logger_handlers:
             if isinstance(handler, logging.FileHandler):
+                if _is_foreign_file_handler(handler):
+                    continue
                 handler.close()
                 handler.baseFilename = handler.baseFilename.replace(
                     old_logging_path, new_logging_path
diff --git a/py3pytest.ini b/py3pytest.ini
index 35e87da29..f58aaf0a9 100644
--- a/py3pytest.ini
+++ b/py3pytest.ini
@@ -1,4 +1,2 @@
 [pytest]
 python_files = test_*.py py3test_*.py  # testfiles running only under python3 start with py3test_
-mccabe-complexity =
-    *.py 10
diff --git a/requirements/test.txt b/requirements/test.txt
index 285c14b67..e01ee928e 100644
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -1,12 +1,8 @@
 -r base.txt
 pycodestyle
-coveralls
+coverage
 pytest
-pytest-mccabe
-pytest-random
 mock
-pytest-cov
 pytest-asyncio
 flake8
-pydocstyle
 pylint
diff --git a/setup.cfg b/setup.cfg
index f84d83a91..81d63ed3e 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,7 +1,3 @@
-[tool:pytest]
-mccabe-complexity =
-    *.py 10
-
 [pycodestyle]
 count = True
 ignore = E501
diff --git a/test/conftest.py b/test/conftest.py
index 8a23550c0..c1128c4c5 100644
--- a/test/conftest.py
+++ b/test/conftest.py
@@ -21,11 +21,13 @@
 
 
 current_process = psutil.Process()
-if platform.system() == 'Linux':
-    (max_open_files_limit_soft, max_open_files_limit_hard) = current_process.rlimit(psutil.RLIMIT_NOFILE)
-else:
+if platform.system() == 'Windows':
     # https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/setmaxstdio?view=vs-2019
     (max_open_files_limit_soft, max_open_files_limit_hard) = (510, 512)  # TODO: any way on Win?
+else:
+    # Unix (Linux, Darwin, BSD, ...): read the real RLIMIT_NOFILE via stdlib resource module.
+    import resource
+    (max_open_files_limit_soft, max_open_files_limit_hard) = resource.getrlimit(resource.RLIMIT_NOFILE)
 
 
 def system_resources_usage():