diff --git a/pytest.ini b/pytest.ini
index 07ac113a3..23108d61e 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -1,4 +1,5 @@
 [pytest]
+asyncio_mode=auto
 testdox_format = plaintext
 addopts = --testdox --timeout 20 --ignore e2e --ignore tests/e2e
 norecursedirs=__pycache__, *.egg-info
diff --git a/requirements_test.txt b/requirements_test.txt
index ea6d086a5..f489cfb2e 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -1,5 +1,5 @@
-pytest < 8.0.0
-pytest-asyncio <= 0.16
+pytest < 9.0.0
+pytest-asyncio
 pytest-mock
 pytest-testdox>=1.1.1
 pytest-cov
diff --git a/tests/e2e/iothub_e2e/aio/test_c2d.py b/tests/e2e/iothub_e2e/aio/test_c2d.py
index 980ccc583..07905e135 100644
--- a/tests/e2e/iothub_e2e/aio/test_c2d.py
+++ b/tests/e2e/iothub_e2e/aio/test_c2d.py
@@ -10,7 +10,6 @@
 logger = logging.getLogger(__name__)
 logger.setLevel(level=logging.INFO)
 
-pytestmark = pytest.mark.asyncio
 
 # TODO: add tests for various application properties
 # TODO: is there a way to call send_c2d so it arrives as an object rather than a JSON string?
diff --git a/tests/e2e/iothub_e2e/aio/test_connect_disconnect.py b/tests/e2e/iothub_e2e/aio/test_connect_disconnect.py
index 89d3d267b..01df331de 100644
--- a/tests/e2e/iothub_e2e/aio/test_connect_disconnect.py
+++ b/tests/e2e/iothub_e2e/aio/test_connect_disconnect.py
@@ -9,8 +9,6 @@
 logger = logging.getLogger(__name__)
 logger.setLevel(level=logging.INFO)
 
-pytestmark = pytest.mark.asyncio
-
 
 @pytest.mark.describe("Client object")
 class TestConnectDisconnect(object):
diff --git a/tests/e2e/iothub_e2e/aio/test_connect_disconnect_stress.py b/tests/e2e/iothub_e2e/aio/test_connect_disconnect_stress.py
index c4d1f5caf..0e4e1d2fd 100644
--- a/tests/e2e/iothub_e2e/aio/test_connect_disconnect_stress.py
+++ b/tests/e2e/iothub_e2e/aio/test_connect_disconnect_stress.py
@@ -10,8 +10,6 @@
 logger = logging.getLogger(__name__)
 logger.setLevel(level=logging.INFO)
 
-pytestmark = pytest.mark.asyncio
-
 
 @pytest.mark.stress
 @pytest.mark.describe("Client object connect/disconnect stress")
diff --git a/tests/e2e/iothub_e2e/aio/test_infrastructure.py b/tests/e2e/iothub_e2e/aio/test_infrastructure.py
index 5ace0aebf..1587d5c71 100644
--- a/tests/e2e/iothub_e2e/aio/test_infrastructure.py
+++ b/tests/e2e/iothub_e2e/aio/test_infrastructure.py
@@ -4,8 +4,6 @@
 import pytest
 import uuid
 
-pytestmark = pytest.mark.asyncio
-
 
 @pytest.mark.describe("ServiceHelper object")
 class TestServiceHelper(object):
diff --git a/tests/e2e/iothub_e2e/aio/test_methods.py b/tests/e2e/iothub_e2e/aio/test_methods.py
index 50e7f487c..4ca196dab 100644
--- a/tests/e2e/iothub_e2e/aio/test_methods.py
+++ b/tests/e2e/iothub_e2e/aio/test_methods.py
@@ -11,8 +11,6 @@
 logger = logging.getLogger(__name__)
 logger.setLevel(level=logging.INFO)
 
-pytestmark = pytest.mark.asyncio
-
 
 @pytest.fixture
 def method_name():
diff --git a/tests/e2e/iothub_e2e/aio/test_sas_renewal.py b/tests/e2e/iothub_e2e/aio/test_sas_renewal.py
index e7942b150..faabe343a 100644
--- a/tests/e2e/iothub_e2e/aio/test_sas_renewal.py
+++ b/tests/e2e/iothub_e2e/aio/test_sas_renewal.py
@@ -11,8 +11,6 @@
 logger = logging.getLogger(__name__)
 logger.setLevel(level=logging.INFO)
 
-pytestmark = pytest.mark.asyncio
-
 
 @pytest.mark.skipif(
     test_config.config.auth not in test_config.AUTH_WITH_RENEWING_TOKEN,
diff --git a/tests/e2e/iothub_e2e/aio/test_send_message.py b/tests/e2e/iothub_e2e/aio/test_send_message.py
index 40bb2daa2..bc609e9c9 100644
--- a/tests/e2e/iothub_e2e/aio/test_send_message.py
+++ b/tests/e2e/iothub_e2e/aio/test_send_message.py
@@ -11,8 +11,6 @@
 logger = logging.getLogger(__name__)
 logger.setLevel(level=logging.INFO)
 
-pytestmark = pytest.mark.asyncio
-
 
 @pytest.mark.describe("Client send_message method")
 class TestSendMessage(object):
diff --git a/tests/e2e/iothub_e2e/aio/test_send_message_stress.py b/tests/e2e/iothub_e2e/aio/test_send_message_stress.py
index 81d7aacb9..64beb7025 100644
--- a/tests/e2e/iothub_e2e/aio/test_send_message_stress.py
+++ b/tests/e2e/iothub_e2e/aio/test_send_message_stress.py
@@ -15,7 +15,6 @@
 logger = logging.getLogger(__name__)
 logger.setLevel(level=logging.INFO)
 
-pytestmark = pytest.mark.asyncio
 
 # Settings that apply to all tests in this module
 TELEMETRY_PAYLOAD_SIZE = 16 * 1024
diff --git a/tests/e2e/iothub_e2e/aio/test_twin.py b/tests/e2e/iothub_e2e/aio/test_twin.py
index 92b798910..a16e9b136 100644
--- a/tests/e2e/iothub_e2e/aio/test_twin.py
+++ b/tests/e2e/iothub_e2e/aio/test_twin.py
@@ -11,8 +11,6 @@
 logger = logging.getLogger(__name__)
 logger.setLevel(level=logging.INFO)
 
-pytestmark = pytest.mark.asyncio
-
 
 # TODO: tests with drop_incoming and reject_incoming
 
diff --git a/tests/e2e/iothub_e2e/aio/test_twin_stress.py b/tests/e2e/iothub_e2e/aio/test_twin_stress.py
index b873becf2..db0858203 100644
--- a/tests/e2e/iothub_e2e/aio/test_twin_stress.py
+++ b/tests/e2e/iothub_e2e/aio/test_twin_stress.py
@@ -12,8 +12,6 @@
 logger = logging.getLogger(__name__)
 logger.setLevel(level=logging.INFO)
 
-pytestmark = pytest.mark.asyncio
-
 
 @pytest.fixture
 def toxic():
diff --git a/tests/e2e/provisioning_e2e/tests/test_async_certificate_enrollments.py b/tests/e2e/provisioning_e2e/tests/test_async_certificate_enrollments.py
index 1b8ea4ab3..0219af14e 100644
--- a/tests/e2e/provisioning_e2e/tests/test_async_certificate_enrollments.py
+++ b/tests/e2e/provisioning_e2e/tests/test_async_certificate_enrollments.py
@@ -29,7 +29,6 @@
 )
 
 
-pytestmark = pytest.mark.asyncio
 logging.basicConfig(level=logging.DEBUG)
 
 
diff --git a/tests/e2e/provisioning_e2e/tests/test_async_symmetric_enrollments.py b/tests/e2e/provisioning_e2e/tests/test_async_symmetric_enrollments.py
index 3657db15b..914a158d5 100644
--- a/tests/e2e/provisioning_e2e/tests/test_async_symmetric_enrollments.py
+++ b/tests/e2e/provisioning_e2e/tests/test_async_symmetric_enrollments.py
@@ -13,7 +13,7 @@
 import os
 import uuid
 
-pytestmark = pytest.mark.asyncio
+
 logging.basicConfig(level=logging.DEBUG)
 
 
diff --git a/tests/unit/common/test_async_adapter.py b/tests/unit/common/test_async_adapter.py
index 800b85d42..d90a895e4 100644
--- a/tests/unit/common/test_async_adapter.py
+++ b/tests/unit/common/test_async_adapter.py
@@ -11,7 +11,6 @@
 import azure.iot.device.common.async_adapter as async_adapter
 
 logging.basicConfig(level=logging.DEBUG)
-pytestmark = pytest.mark.asyncio
 
 
 @pytest.fixture
diff --git a/tests/unit/iothub/aio/test_async_clients.py b/tests/unit/iothub/aio/test_async_clients.py
index b22d1774e..3796f494a 100644
--- a/tests/unit/iothub/aio/test_async_clients.py
+++ b/tests/unit/iothub/aio/test_async_clients.py
@@ -44,7 +44,6 @@
     SharedIoTHubModuleClientCreateFromEdgeEnvironmentWithDebugEnvTests,
 )
 
-pytestmark = pytest.mark.asyncio
 logging.basicConfig(level=logging.DEBUG)
 
 
diff --git a/tests/unit/iothub/aio/test_async_handler_manager.py b/tests/unit/iothub/aio/test_async_handler_manager.py
index b3dc5c056..781b902ab 100644
--- a/tests/unit/iothub/aio/test_async_handler_manager.py
+++ b/tests/unit/iothub/aio/test_async_handler_manager.py
@@ -16,7 +16,6 @@
 from azure.iot.device.iothub.inbox_manager import InboxManager
 from azure.iot.device.iothub.aio.async_inbox import AsyncClientInbox
 
-pytestmark = pytest.mark.asyncio
 logging.basicConfig(level=logging.DEBUG)
 
 # NOTE ON TEST IMPLEMENTATION:
diff --git a/tests/unit/provisioning/aio/test_async_provisioning_device_client.py b/tests/unit/provisioning/aio/test_async_provisioning_device_client.py
index 2b1106a52..75ebc5107 100644
--- a/tests/unit/provisioning/aio/test_async_provisioning_device_client.py
+++ b/tests/unit/provisioning/aio/test_async_provisioning_device_client.py
@@ -20,7 +20,6 @@
 
 
 logging.basicConfig(level=logging.DEBUG)
-pytestmark = pytest.mark.asyncio
 
 
 async def create_completed_future(result=None):