diff --git a/tests/components/test_device_connection.py b/tests/components/test_device_connection.py
index c245205..8c5c9d5 100644
--- a/tests/components/test_device_connection.py
+++ b/tests/components/test_device_connection.py
@@ -6,7 +6,7 @@ import pytest
 from pytest import LogCaptureFixture
 
 
-@pytest.mark.asyncio
+@pytest.mark.asyncio(scope="session")
 async def test_reconnection(caplog: LogCaptureFixture) -> None:
     class MyService(pydase.components.device_connection.DeviceConnection):
         def __init__(
diff --git a/tests/data_service/test_data_service_cache.py b/tests/data_service/test_data_service_cache.py
index 8bb734a..e21e64e 100644
--- a/tests/data_service/test_data_service_cache.py
+++ b/tests/data_service/test_data_service_cache.py
@@ -35,7 +35,7 @@ def test_nested_attributes_cache_callback() -> None:
     )
 
 
-@pytest.mark.asyncio
+@pytest.mark.asyncio(scope="session")
 async def test_task_status_update() -> None:
     class ServiceClass(pydase.DataService):
         name = "World"
diff --git a/tests/data_service/test_task_manager.py b/tests/data_service/test_task_manager.py
index b5308ca..bb1619b 100644
--- a/tests/data_service/test_task_manager.py
+++ b/tests/data_service/test_task_manager.py
@@ -10,7 +10,7 @@ from pytest import LogCaptureFixture
 logger = logging.getLogger("pydase")
 
 
-@pytest.mark.asyncio
+@pytest.mark.asyncio(scope="session")
 async def test_autostart_task_callback(caplog: LogCaptureFixture) -> None:
     class MyService(pydase.DataService):
         def __init__(self) -> None:
@@ -36,7 +36,7 @@ async def test_autostart_task_callback(caplog: LogCaptureFixture) -> None:
     assert "'my_other_task' changed to 'TaskStatus.RUNNING'" in caplog.text
 
 
-@pytest.mark.asyncio
+@pytest.mark.asyncio(scope="session")
 async def test_DataService_subclass_autostart_task_callback(
     caplog: LogCaptureFixture,
 ) -> None:
@@ -66,7 +66,7 @@ async def test_DataService_subclass_autostart_task_callback(
     assert "'sub_service.my_other_task' changed to 'TaskStatus.RUNNING'" in caplog.text
 
 
-@pytest.mark.asyncio
+@pytest.mark.asyncio(scope="session")
 async def test_DataService_subclass_list_autostart_task_callback(
     caplog: LogCaptureFixture,
 ) -> None:
@@ -108,7 +108,7 @@ async def test_DataService_subclass_list_autostart_task_callback(
     )
 
 
-@pytest.mark.asyncio
+@pytest.mark.asyncio(scope="session")
 async def test_start_and_stop_task_methods(caplog: LogCaptureFixture) -> None:
     class MyService(pydase.DataService):
         def __init__(self) -> None:
diff --git a/tests/utils/serialization/test_serializer.py b/tests/utils/serialization/test_serializer.py
index df07cf7..0dc872d 100644
--- a/tests/utils/serialization/test_serializer.py
+++ b/tests/utils/serialization/test_serializer.py
@@ -207,7 +207,7 @@ def test_ColouredEnum_serialize() -> None:
     }
 
 
-@pytest.mark.asyncio
+@pytest.mark.asyncio(scope="session")
 async def test_method_serialization() -> None:
     class ClassWithMethod(pydase.DataService):
         def some_method(self) -> str: