diff --git a/tests/conftest.py b/tests/conftest.py
index 1cf058d7000..d0248464cb7 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -658,16 +658,6 @@ def mock_server() -> Iterator[MockServer]:
         yield test_server
 
 
-@pytest.fixture
-def utc() -> Iterator[None]:
-    # time.tzset() is not implemented on some platforms, e.g. Windows.
-    tzset = getattr(time, "tzset", lambda: None)
-    with patch.dict(os.environ, {"TZ": "UTC"}):
-        tzset()
-        yield
-    tzset()
-
-
 @pytest.fixture
 def proxy(request: pytest.FixtureRequest) -> str:
     return request.config.getoption("proxy")