diff --git a/devolo_home_control_api/publisher/publisher.py b/devolo_home_control_api/publisher/publisher.py
index 490f39d..ef3f745 100644
--- a/devolo_home_control_api/publisher/publisher.py
+++ b/devolo_home_control_api/publisher/publisher.py
@@ -2,7 +2,8 @@
 from __future__ import annotations
 
 import logging
-from typing import Any, Callable, KeysView
+from collections.abc import KeysView
+from typing import Any, Callable
 
 
 class Publisher:
diff --git a/pyproject.toml b/pyproject.toml
index e9a1d47..e11886c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -57,7 +57,7 @@ ignore_missing_imports = true
 line-length = 127
 lint.ignore = ["ANN401", "B024", "COM812", "D203", "D205", "D212", "EM", "FBT001", "N818", "TCH", "TRY300", "TRY400"]
 lint.select = ["ALL"]
-target-version = "py37"
+target-version = "py39"
 
 [tool.ruff.lint.isort]
 combine-as-imports = true
diff --git a/tests/__init__.py b/tests/__init__.py
index 85e1387..b8f660b 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -39,7 +39,7 @@ def get_fixtures_path() -> Path:
     return Path(__file__).parent.joinpath("fixtures")
 
 
-@lru_cache()
+@lru_cache
 def load_fixture(name: str) -> dict[str, Any]:
     """Load a fixture."""
     fixture_path = get_fixtures_path().joinpath(f"{name}.json")
diff --git a/tests/conftest.py b/tests/conftest.py
index 38a8281..69be621 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,6 +1,6 @@
 """Configure tests."""
+from collections.abc import Generator
 from socket import inet_aton
-from typing import Generator
 from unittest.mock import patch
 
 import pytest
diff --git a/tests/mocks/mock_websocket.py b/tests/mocks/mock_websocket.py
index aba8eaf..7f76167 100644
--- a/tests/mocks/mock_websocket.py
+++ b/tests/mocks/mock_websocket.py
@@ -95,7 +95,7 @@ def read() -> None:
             """Call registered callback method."""
             data = self.sock.recv()
             if not data:
-                self._callback(self.on_error, self, Exception)
+                self._callback(self.on_error, Exception)
             elif data == str(ABNF.OPCODE_PONG):
                 self._callback(self.on_pong, data)
             elif data == str(ABNF.OPCODE_CLOSE):