diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2b1f0c2..84ac791 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,8 +11,6 @@ jobs:
     with:
       CODE_FOLDER: zigpy_xbee
       CACHE_VERSION: 2
-      PYTHON_VERSION_DEFAULT: 3.9.15
-      PRE_COMMIT_CACHE_PATH:  ~/.cache/pre-commit
       MINIMUM_COVERAGE_PERCENTAGE: 100
     secrets:
       CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
diff --git a/tests/test_api.py b/tests/test_api.py
index 48768e1..a366a81 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -323,7 +323,7 @@ def _handle_at_response(api, tsn, status, at_response=b""):
     return response
 
 
-def test_handle_at_response_none(api):
+async def test_handle_at_response_none(api):
     """Test AT successful response with no value."""
     tsn = 123
     fut = _handle_at_response(api, tsn, 0)
@@ -332,7 +332,7 @@ def test_handle_at_response_none(api):
     assert fut.exception() is None
 
 
-def test_handle_at_response_data(api):
+async def test_handle_at_response_data(api):
     """Test AT successful response with data."""
     tsn = 123
     status, response = 0, 0x23
@@ -342,7 +342,7 @@ def test_handle_at_response_data(api):
     assert fut.exception() is None
 
 
-def test_handle_at_response_error(api):
+async def test_handle_at_response_error(api):
     """Test AT unsuccessful response."""
     tsn = 123
     status, response = 1, 0x23
@@ -351,7 +351,7 @@ def test_handle_at_response_error(api):
     assert isinstance(fut.exception(), ATCommandError)
 
 
-def test_handle_at_response_invalid_command(api):
+async def test_handle_at_response_invalid_command(api):
     """Test invalid AT command response."""
     tsn = 123
     status, response = 2, 0x23
@@ -360,7 +360,7 @@ def test_handle_at_response_invalid_command(api):
     assert isinstance(fut.exception(), InvalidCommand)
 
 
-def test_handle_at_response_undef_error(api):
+async def test_handle_at_response_undef_error(api):
     """Test AT unsuccessful response with undefined error."""
     tsn = 123
     status, response = 0xEE, 0x23
@@ -482,7 +482,7 @@ def test_handle_tx_status_duplicate(api):
     assert send_fut.set_exception.call_count == 0
 
 
-def test_handle_registration_status(api):
+async def test_handle_registration_status(api):
     """Test device registration status."""
     frame_id = 0x12
     status = xbee_t.RegistrationStatus.SUCCESS
@@ -526,7 +526,7 @@ async def test_command_mode_at_cmd_timeout(api):
     assert result is None
 
 
-def test_handle_command_mode_rsp(api):
+async def test_handle_command_mode_rsp(api):
     """Test command mode response."""
     api._cmd_mode_future = None
     data = "OK"
diff --git a/tests/test_uart.py b/tests/test_uart.py
index a235bd8..fa4739d 100644
--- a/tests/test_uart.py
+++ b/tests/test_uart.py
@@ -4,7 +4,7 @@
 from unittest import mock
 
 import pytest
-import serial_asyncio
+import serial_asyncio_fast
 import zigpy.config
 
 from zigpy_xbee import uart
@@ -22,7 +22,7 @@ def gw():
     """Gateway fixture."""
     gw = uart.Gateway(mock.MagicMock())
     gw._transport = mock.MagicMock()
-    gw._transport.serial.BAUDRATES = serial_asyncio.serial.Serial.BAUDRATES
+    gw._transport.serial.BAUDRATES = serial_asyncio_fast.serial.Serial.BAUDRATES
     return gw
 
 
@@ -48,7 +48,7 @@ async def mock_conn(loop, protocol_factory, **kwargs):
         loop.call_soon(protocol.connection_made, None)
         return None, protocol
 
-    monkeypatch.setattr(serial_asyncio, "create_serial_connection", mock_conn)
+    monkeypatch.setattr(serial_asyncio_fast, "create_serial_connection", mock_conn)
 
     await uart.connect(DEVICE_CONFIG, api)