diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index efb225a..72abb3d 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -20,7 +20,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: [ '3.8', '3.9', '3.10', '3.11', '3.12' ]
+        python-version: [ '3.10', '3.11', '3.12', '3.13', '3.14' ]
 
     steps:
     - name: Checkout
@@ -30,20 +30,22 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
 
-    - name: Upgrade pip
-      run: python3 -m pip install --upgrade pip
-
     - name: Install ypywidgets in dev mode
-      run: pip install -e ".[dev]"
+      run: pip install -e . --group dev
+
+    - name: Lint
+      run: |
+        ruff format --check src tests
+        ruff check src tests
 
     - name: Check types
-      run: mypy src
+      run: mypy src tests
 
     - name: Run tests
       run: pytest ./tests -v --color=yes
 
     - name: Run code coverage
-      if: ${{ (matrix.python-version == '3.12') && (matrix.os == 'ubuntu-latest') }}
+      if: ${{ (matrix.python-version == '3.14') && (matrix.os == 'ubuntu-latest') }}
       run: |
         coverage run -m pytest tests
         coverage report --fail-under=100
diff --git a/pyproject.toml b/pyproject.toml
index 428c59e..d773051 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,7 +8,7 @@ version = "0.9.7"
 description = "Y-based Jupyter widgets for Python"
 readme = "README.md"
 license = "MIT"
-requires-python = ">=3.8"
+requires-python = ">=3.10"
 authors = [
     { name = "David Brochart", email = "david.brochart@gmail.com" },
 ]
@@ -24,14 +24,16 @@ dependencies = [
 ]
 
 [project.urls]
-Homepage = "https://github.com/davidbrochart/ypywidgets"
+Homepage = "https://github.com/QuantStack/ypywidgets"
 
-[project.optional-dependencies]
+[dependency-groups]
 dev = [
+    "anyio",
     "coverage >=7.0.0,<8.0.0",
     "mypy",
     "pytest",
-    "pytest-asyncio",
+    "ruff",
+    "trio",
 ]
 
 [tool.hatch.build.targets.wheel]
diff --git a/src/ypywidgets/comm.py b/src/ypywidgets/comm.py
index 89a5a89..10f004c 100644
--- a/src/ypywidgets/comm.py
+++ b/src/ypywidgets/comm.py
@@ -54,12 +54,13 @@ def __init__(
 
     def _receive(self, msg):
         message = bytes(msg["buffers"][0])
-        if message[0] == YMessageType.SYNC:
-            reply = handle_sync_message(message[1:], self._ydoc)
-            if reply is not None:
-                self._comm.send(buffers=[reply])
-            if message[1] == YSyncMessageType.SYNC_STEP2:
-                self._ydoc.observe(self._send)
+        match message[0]:
+            case YMessageType.SYNC:
+                reply = handle_sync_message(message[1:], self._ydoc)
+                if reply is not None:
+                    self._comm.send(buffers=[reply])
+                if message[1] == YSyncMessageType.SYNC_STEP2:
+                    self._ydoc.observe(self._send)
 
     def _send(self, event: TransactionEvent):
         update = event.update
@@ -69,12 +70,12 @@ def _send(self, event: TransactionEvent):
 
 class CommWidget(Widget):
     def __init__(
-            self,
-            ydoc: Doc | None = None,
-            comm_data: dict | None = None,
-            comm_metadata: dict | None = None,
-            comm_id: str | None = None,
-        ):
+        self,
+        ydoc: Doc | None = None,
+        comm_data: dict | None = None,
+        comm_metadata: dict | None = None,
+        comm_id: str | None = None,
+    ):
         super().__init__(ydoc)
         model_name = self.__class__.__name__
         _model_name = self.ydoc["_model_name"] = Text()
@@ -90,13 +91,13 @@ def __init__(
     def _repr_mimebundle_(self, *args, **kwargs):  # pragma: nocover
         plaintext = repr(self)
         if len(plaintext) > 110:
-            plaintext = plaintext[:110] + '…'
+            plaintext = plaintext[:110] + "…"
         data = {
             "text/plain": plaintext,
             "application/vnd.jupyter.ywidget-view+json": {
                 "version_major": 2,
                 "version_minor": 0,
                 "model_id": self._comm.comm_id,
-            }
+            },
         }
         return data
diff --git a/src/ypywidgets/reactive.py b/src/ypywidgets/reactive.py
index e337321..47a12e4 100644
--- a/src/ypywidgets/reactive.py
+++ b/src/ypywidgets/reactive.py
@@ -10,7 +10,6 @@
 
 
 class Reactive(_Reactive, Generic[ValueType]):
-
     def __init__(
         self,
         default: ValueType,
diff --git a/tests/conftest.py b/tests/conftest.py
index b7a0ea5..ede26f5 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,9 +1,13 @@
-import asyncio
-import time
-from typing import Optional
+import math
+from contextlib import AsyncExitStack
+from functools import partial
+from typing import Any, cast
 
 import comm
 import pytest
+from anyio import Event, create_memory_object_stream, create_task_group, fail_after
+from anyio.abc import TaskGroup
+from anyio.streams.memory import MemoryObjectReceiveStream, MemoryObjectSendStream
 from pycrdt import (
     YMessageType,
     YSyncMessageType,
@@ -15,86 +19,163 @@
 from ypywidgets import Widget
 from ypywidgets.comm import CommWidget
 
+pytestmark = pytest.mark.anyio
 
-class MockComm(comm.base_comm.BaseComm):
 
+class MockComm(comm.base_comm.BaseComm):
     def __init__(
-            self,
-            comm_id=None,
-            target_name=None,
-            data=None,
-            metadata=None,
+        self,
+        task_group: TaskGroup,
+        send_send_stream: MemoryObjectSendStream,
+        send_recv_stream: MemoryObjectReceiveStream,
+        recv_send_stream: MemoryObjectSendStream,
+        recv_recv_stream: MemoryObjectReceiveStream,
+        comm_id: str = "",
+        target_name: str = "",
+        data=None,
+        metadata=None,
+    ) -> None:
+        self.send_send_stream = send_send_stream
+        self.send_recv_stream = send_recv_stream
+        self.recv_send_stream = recv_send_stream
+        self.recv_recv_stream = recv_recv_stream
+        super().__init__(
+            comm_id=comm_id, target_name=target_name, data=data, metadata=metadata
+        )
+        task_group.start_soon(self.receive)
+
+    def publish_msg(
+        self, msg_type, data, metadata, buffers, target_name=None, target_module=None
     ):
-        self.send_queue = asyncio.Queue()
-        self.recv_queue = asyncio.Queue()
-        super().__init__(comm_id=comm_id, target_name=target_name, data=data, metadata=metadata)
-        self.receive_task = asyncio.create_task(self.receive())
-
-    def publish_msg(self, msg_type, data, metadata, buffers, target_name=None, target_module=None):
-        self.send_queue.put_nowait((msg_type, data, metadata, buffers, target_name, target_module))
+        self.send_send_stream.send_nowait(
+            (msg_type, data, metadata, buffers, target_name, target_module)
+        )
 
     def handle_msg(self, msg):
         self._msg_callback(msg)
 
-    async def receive(self):
+    async def receive(self) -> None:
         while True:
-            msg = await self.recv_queue.get()
+            msg = await self.recv_recv_stream.receive()
             self.handle_msg(msg)
 
 
-comm.create_comm = MockComm
-
+class Context:
+    def __init__(self):
+        self.tasks = []
+
+    def add_task(self, task):
+        self.tasks.append(task)
+
+    async def __aenter__(self) -> "Context":
+        send_send_stream, send_recv_stream = create_memory_object_stream(
+            max_buffer_size=math.inf
+        )
+        recv_send_stream, recv_recv_stream = create_memory_object_stream(
+            max_buffer_size=math.inf
+        )
+        async with AsyncExitStack() as stack:
+            await stack.enter_async_context(send_send_stream)
+            await stack.enter_async_context(recv_send_stream)
+            await stack.enter_async_context(send_recv_stream)
+            await stack.enter_async_context(recv_recv_stream)
+            self.task_group = await stack.enter_async_context(create_task_group())
+            comm.create_comm = partial(
+                MockComm,
+                self.task_group,
+                send_send_stream,
+                send_recv_stream,
+                recv_send_stream,
+                recv_recv_stream,
+            )
+            for task in self.tasks:
+                self.task_group.start_soon(task)
+            self.stack = stack.pop_all()
+        return self
+
+    async def __aexit__(self, *exc) -> bool | None:
+        self.task_group.cancel_scope.cancel()
+        comm.create_comm = _create_comm
+        return await self.stack.__aexit__(*exc)
+
+
+def _create_comm(*args: Any, **kwargs: Any) -> comm.BaseComm:
+    return comm.DummyComm(*args, **kwargs)  # pragma: nocover
+
+
+class SyncedWidgets:
+    def __init__(
+        self, widget_factories: tuple[type[CommWidget], type[Widget]], context: Context
+    ) -> None:
+        self.local_widget_factory, self.remote_widget_factory = widget_factories
+        self.local_widget: CommWidget | None = None
+        self.remote_widget: Widget | None = None
+        self.local_widget_created = Event()
+        self.remote_widget_created = Event()
+        context.add_task(self.receive)
+
+    def send(self, event: TransactionEvent) -> None:
+        update = event.update
+        message = create_update_message(update)
+        self.comm.recv_send_stream.send_nowait({"buffers": [message]})
 
-@pytest.fixture
-def widget_factories():
-    return CommWidget, Widget
+    async def receive(self) -> None:
+        self.local_widget = self.local_widget_factory()
+        self.local_widget_created.set()
+        self.comm = cast(MockComm, self.local_widget._comm)
+        while True:
+            (
+                msg_type,
+                data,
+                metadata,
+                buffers,
+                target_name,
+                target_module,
+            ) = await self.comm.send_recv_stream.receive()
+            match msg_type:
+                case "comm_open":
+                    self.remote_widget = self.remote_widget_factory()
+                    msg = create_sync_message(self.remote_widget.ydoc)
+                    self.comm.handle_msg({"buffers": [msg]})
+                case "comm_msg":
+                    assert self.remote_widget is not None
+                    message = buffers[0]
+                    match message[0]:
+                        case YMessageType.SYNC:
+                            reply = handle_sync_message(
+                                message[1:], self.remote_widget.ydoc
+                            )
+                            if reply is not None:
+                                self.comm.handle_msg({"buffers": [reply]})
+                            if message[1] == YSyncMessageType.SYNC_STEP2:
+                                self.sub = self.remote_widget.ydoc.observe(self.send)
+                                self.remote_widget_created.set()
+
+    async def get_local_widget(self, timeout: float = 0.2) -> CommWidget:
+        with fail_after(timeout):
+            await self.local_widget_created.wait()
+            assert self.local_widget is not None
+            return self.local_widget
+
+    async def get_remote_widget(self, timeout: float = 0.2) -> Widget:
+        with fail_after(timeout):
+            await self.remote_widget_created.wait()
+            assert self.remote_widget is not None
+            return self.remote_widget
 
 
 @pytest.fixture
-async def synced_widgets(widget_factories):
-    local_widget = widget_factories[0]()
-    remote_widget_manager = RemoteWidgetManager(widget_factories[1], local_widget._comm)
-    remote_widget = await remote_widget_manager.get_widget()
-    return local_widget, remote_widget
+def context() -> Context:
+    return Context()
 
 
-class RemoteWidgetManager:
-
-    comm: Optional[MockComm]
-    widget: Optional[Widget]
+@pytest.fixture
+def widget_factories() -> tuple[type[CommWidget], type[Widget]]:
+    return CommWidget, Widget
 
-    def __init__(self, widget_factory, comm):
-        self.widget_factory = widget_factory
-        self.comm = comm
-        self.widget = None
-        self.receive_task = asyncio.create_task(self.receive())
 
-    def send(self, event: TransactionEvent):
-        update = event.update
-        message = create_update_message(update)
-        self.comm.recv_queue.put_nowait({"buffers": [message]})
-
-    async def receive(self):
-        while True:
-            msg_type, data, metadata, buffers, target_name, target_module = await self.comm.send_queue.get()
-            if msg_type == "comm_open":
-                self.widget = self.widget_factory()
-                msg = create_sync_message(self.widget.ydoc)
-                self.comm.handle_msg({"buffers": [msg]})
-            elif msg_type == "comm_msg":
-                message = buffers[0]
-                if message[0] == YMessageType.SYNC:
-                    reply = handle_sync_message(message[1:], self.widget.ydoc)
-                    if reply is not None:
-                        self.comm.handle_msg({"buffers": [reply]})
-                    if message[1] == YSyncMessageType.SYNC_STEP2:
-                        self.widget.ydoc.observe(self.send)
-
-    async def get_widget(self, timeout=0.1):
-        t = time.monotonic()
-        while True:
-            if self.widget:
-                return self.widget
-            await asyncio.sleep(0)
-            if time.monotonic() - t > timeout:  # pragma: nocover
-                raise TimeoutError("Timeout waiting for widget")
+@pytest.fixture
+def synced_widgets(
+    widget_factories: tuple[type[CommWidget], type[Widget]], context: Context
+) -> SyncedWidgets:
+    return SyncedWidgets(widget_factories, context)
diff --git a/tests/test_attributes.py b/tests/test_attributes.py
index 4bcfe85..7e762d5 100644
--- a/tests/test_attributes.py
+++ b/tests/test_attributes.py
@@ -1,71 +1,78 @@
-import asyncio
-from typing import Optional
+from __future__ import annotations
 
 import pytest
+from anyio import sleep
 from pycrdt import Text
-from ypywidgets import Reactive
+from ypywidgets import Reactive, Widget
 from ypywidgets.comm import CommWidget
 
+pytestmark = pytest.mark.anyio
+
 
 class Widget1(CommWidget):
-    foo = Reactive[str]("foo1")
-    bar = Reactive[str]("bar1")
-    baz = Reactive[Optional[str]](None)
+    foo = Reactive[str | None]("foo1")
+    bar = Reactive[str | None]("bar1")
+    baz = Reactive[str | None](None)
 
 
-class Widget2(CommWidget):
-    foo = Reactive[str]("")
+class Widget2(Widget):
+    foo = Reactive[str | None](None)
+    bar = Reactive[str | None](None)
+    baz = Reactive[str | None](None)
 
     @foo.watch
     def _watch_foo(self, old, new):
         print(f"foo changed: '{old}'->'{new}'")
 
 
-@pytest.mark.asyncio
-async def test_create_ydoc(synced_widgets):
-    local_widget, remote_widget = await synced_widgets
+async def test_create_ydoc(synced_widgets, context):
+    async with context:
+        local_widget = await synced_widgets.get_local_widget()
+        remote_widget = await synced_widgets.get_remote_widget()
 
-    local_text = Text()
-    local_widget.ydoc["text"] = local_text
-    text = "hello world!"
-    local_text += text
+        local_text = Text()
+        local_widget.ydoc["text"] = local_text
+        text = "hello world!"
+        local_text += text
 
-    remote_text = Text()
-    remote_widget.ydoc["text"] = remote_text
-    await asyncio.sleep(0.01)
-    assert str(remote_text) == text
+        remote_text = Text()
+        remote_widget.ydoc["text"] = remote_text
+        await sleep(0.01)
+        assert str(remote_text) == text
 
 
-@pytest.mark.asyncio
-@pytest.mark.parametrize("widget_factories", ((Widget1, Widget1),))
-async def test_sync_attribute(widget_factories, synced_widgets):
-    local_widget, remote_widget = await synced_widgets
+@pytest.mark.parametrize("widget_factories", ((Widget1, Widget2),))
+async def test_sync_attribute(widget_factories, synced_widgets, context):
+    async with context:
+        local_widget = await synced_widgets.get_local_widget()
+        remote_widget = await synced_widgets.get_remote_widget()
 
-    with pytest.raises(AttributeError):
-        assert local_widget.wrong_attr1
+        with pytest.raises(AttributeError):
+            assert local_widget.wrong_attr1
 
-    with pytest.raises(AttributeError):
-        assert remote_widget.wrong_attr2
+        with pytest.raises(AttributeError):
+            assert remote_widget.wrong_attr2
 
-    local_widget.foo = "foo2"
-    assert remote_widget.foo == "foo1"  # not synced yet
-    await asyncio.sleep(0.01)  # wait for sync
-    assert remote_widget.foo == "foo2"
+        local_widget.foo = "foo2"
+        assert remote_widget.foo is None  # not synced yet
+        await sleep(0.01)  # wait for sync
+        assert remote_widget.foo == "foo2"
 
-    remote_widget.baz = "baz2"
-    assert local_widget.baz is None  # not synced yet
-    await asyncio.sleep(0.01)  # wait for sync
-    assert local_widget.baz == "baz2"
+        remote_widget.baz = "baz2"
+        assert local_widget.baz is None  # not synced yet
+        await sleep(0.01)  # wait for sync
+        assert local_widget.baz == "baz2"
 
 
-@pytest.mark.asyncio
 @pytest.mark.parametrize("widget_factories", ((Widget1, Widget2),))
-async def test_watch_attribute(widget_factories, synced_widgets, capfd):
-    local_widget, remote_widget = await synced_widgets
+async def test_watch_attribute(widget_factories, synced_widgets, capfd, context):
+    async with context:
+        local_widget = await synced_widgets.get_local_widget()
+        await synced_widgets.get_remote_widget()
 
-    local_widget.foo = "foo"
+        local_widget.foo = "foo"
 
-    # we're seeing the remote widget watch callback
-    await asyncio.sleep(0.01)
-    out, err = capfd.readouterr()
-    assert out == "foo changed: ''->'foo'\n"
+        # we're seeing the remote widget watch callback
+        await sleep(0.01)
+        out, err = capfd.readouterr()
+        assert out == "foo changed: 'None'->'foo'\n"