diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 84551b8..bc363b7 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -12,7 +12,7 @@ jobs:
     steps:
     - uses: actions/checkout@v7
     - name: Set up Python
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@v7
       with:
         python-version: 3.x
     - name: Install dependencies
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 160c97d..5c7c8cb 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -26,7 +26,7 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v7
 
-    - uses: actions/setup-python@v6
+    - uses: actions/setup-python@v7
       with:
         python-version: ${{ matrix.python-version }}
 
diff --git a/pyproject.toml b/pyproject.toml
index ca9aee5..d7d506e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,6 +34,7 @@ dev = [
     "pytest",
     "ruff",
     "trio",
+    "typing_extensions >=4.15.0,<5.0.0; python_version<'3.11'",
 ]
 
 [tool.hatch.build.targets.wheel]
diff --git a/src/ypywidgets/__init__.py b/src/ypywidgets/__init__.py
index ed8598d..accf874 100644
--- a/src/ypywidgets/__init__.py
+++ b/src/ypywidgets/__init__.py
@@ -1,8 +1,7 @@
 import importlib.metadata
 
-from .widget import Widget as Widget
 from .reactive import Reactive as Reactive
-
+from .widget import Widget as Widget
 
 try:
     __version__ = importlib.metadata.version("ypywidgets")
diff --git a/src/ypywidgets/comm.py b/src/ypywidgets/comm.py
index b2d1d91..7c70afa 100644
--- a/src/ypywidgets/comm.py
+++ b/src/ypywidgets/comm.py
@@ -92,10 +92,10 @@ def __init__(
         _model_name = self.ydoc["_model_name"] = Text()
         _model_name += model_name
         if comm_metadata is None:
-            comm_metadata = dict(
-                ymodel_name=model_name,
-                create_ydoc=not ydoc,
-            )
+            comm_metadata = {
+                "ymodel_name": model_name,
+                "create_ydoc": not ydoc,
+            }
         self._comm = create_widget_comm(comm_data, comm_metadata, comm_id)
         self._comm_provider = CommProvider(self.ydoc, self._comm)
 
diff --git a/tests/conftest.py b/tests/conftest.py
index ede26f5..f043664 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,4 +1,5 @@
 import math
+import sys
 from contextlib import AsyncExitStack
 from functools import partial
 from typing import Any, cast
@@ -9,16 +10,23 @@
 from anyio.abc import TaskGroup
 from anyio.streams.memory import MemoryObjectReceiveStream, MemoryObjectSendStream
 from pycrdt import (
+    TransactionEvent,
     YMessageType,
     YSyncMessageType,
-    TransactionEvent,
     create_sync_message,
     create_update_message,
     handle_sync_message,
 )
+
 from ypywidgets import Widget
 from ypywidgets.comm import CommWidget
 
+if sys.version_info >= (3, 11):
+    from typing import Self
+else:  # pragma: nocover
+    from typing_extensions import Self
+
+
 pytestmark = pytest.mark.anyio
 
 
@@ -67,10 +75,14 @@ def __init__(self):
     def add_task(self, task):
         self.tasks.append(task)
 
-    async def __aenter__(self) -> "Context":
+    async def __aenter__(self) -> Self:
+        send_send_stream: MemoryObjectSendStream
+        send_recv_stream: MemoryObjectReceiveStream
         send_send_stream, send_recv_stream = create_memory_object_stream(
             max_buffer_size=math.inf
         )
+        recv_send_stream: MemoryObjectSendStream
+        recv_recv_stream: MemoryObjectReceiveStream
         recv_send_stream, recv_recv_stream = create_memory_object_stream(
             max_buffer_size=math.inf
         )
@@ -126,11 +138,11 @@ async def receive(self) -> None:
         while True:
             (
                 msg_type,
-                data,
-                metadata,
+                _data,
+                _metadata,
                 buffers,
-                target_name,
-                target_module,
+                _target_name,
+                _target_module,
             ) = await self.comm.send_recv_stream.receive()
             match msg_type:
                 case "comm_open":
diff --git a/tests/test_attributes.py b/tests/test_attributes.py
index 7e762d5..d2b6d88 100644
--- a/tests/test_attributes.py
+++ b/tests/test_attributes.py
@@ -3,6 +3,7 @@
 import pytest
 from anyio import sleep
 from pycrdt import Text
+
 from ypywidgets import Reactive, Widget
 from ypywidgets.comm import CommWidget
 
@@ -74,5 +75,5 @@ async def test_watch_attribute(widget_factories, synced_widgets, capfd, context)
 
         # we're seeing the remote widget watch callback
         await sleep(0.01)
-        out, err = capfd.readouterr()
+        out, _err = capfd.readouterr()
         assert out == "foo changed: 'None'->'foo'\n"
diff --git a/tests/test_comm_awareness.py b/tests/test_comm_awareness.py
index 5f9ca0f..3295591 100644
--- a/tests/test_comm_awareness.py
+++ b/tests/test_comm_awareness.py
@@ -2,6 +2,7 @@
 
 import pytest
 from pycrdt import Awareness, Doc, YMessageType, create_awareness_message
+
 from ypywidgets.comm import CommWidget
 
 pytestmark = pytest.mark.anyio
@@ -29,7 +30,7 @@ async def test_comm_widget_exposes_provider_awareness():
     assert widget.awareness is widget._comm_provider.awareness
 
 
-async def test_comm_widget_awareness_observe_and_unobserve():
+async def test_comm_widget_awareness_observe_and_unobserve() -> None:
     widget = CommWidget()
 
     events: list[str] = []