diff --git a/pyproject.toml b/pyproject.toml
index a2a0ed24f..c6654194d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -60,19 +60,19 @@ documentation = [
     "sphinx-rtd-theme>=1.1.1"
 ]
 development = [
-    "build>=1.0.3",
-    "codespell>=2.2.2",
-    "coverage>=7.4.0",
-    "mypy>=1.6.0",
-    "pylint>=3.0.0",
-    "pytest>=7.3.1",
-    "pytest-asyncio>=0.20.3",
+    "build>=1.1.1",
+    "codespell>=2.2.6",
+    "coverage>=7.4.3",
+    "mypy>=1.9.0",
+    "pylint>=3.1.0",
+    "pytest>=8.1.0",
+    "pytest-asyncio>=0.23.5.post1",
     "pytest-cov>=4.1.0",
     "pytest-profiling>=1.7.0",
-    "pytest-timeout>=2.2.0",
-    "pytest-xdist>=3.3.1",
-    "ruff>=0.2.0",
-    "twine>=4.0.2",
+    "pytest-timeout>=2.3.1",
+    "pytest-xdist>=3.5.0",
+    "ruff>=0.3.3",
+    "twine>=5.0.0",
     "types-Pygments",
     "types-pyserial"
 ]
diff --git a/test/conftest.py b/test/conftest.py
index c405d2490..ee499042a 100644
--- a/test/conftest.py
+++ b/test/conftest.py
@@ -24,8 +24,6 @@
 
 def pytest_configure():
     """Configure pytest."""
-    pytest.IS_DARWIN = platform.system().lower() == "darwin"
-    pytest.IS_WINDOWS = platform.system().lower() == "windows"
 
 
 # -----------------------------------------------------------------------#
@@ -93,7 +91,7 @@ def prepare_commparams_client(use_port, use_host, use_comm_type):
     """Prepare CommParamsClass object."""
     if use_host == NULLMODEM_HOST and use_comm_type == CommType.SERIAL:
         use_host = f"{NULLMODEM_HOST}:{use_port}"
-    timeout = 10 if not pytest.IS_WINDOWS else 2
+    timeout = 10 if platform.system().lower() != "windows" else 2
     return CommParams(
         comm_name="test comm",
         comm_type=use_comm_type,
diff --git a/test/transport/test_comm.py b/test/transport/test_comm.py
index 918da70dc..4ddf7b742 100644
--- a/test/transport/test_comm.py
+++ b/test/transport/test_comm.py
@@ -1,5 +1,6 @@
 """Test transport."""
 import asyncio
+import platform
 import time
 from unittest import mock
 
@@ -13,7 +14,7 @@
 from pymodbus.transport.serialtransport import SerialTransport
 
 
-FACTOR = 1.2 if not pytest.IS_WINDOWS else 4.2
+FACTOR = 1.2 if platform.system().lower() != "windows" else 4.2
 
 
 class TestTransportComm: