diff --git a/src/flake8/options/config.py b/src/flake8/options/config.py
index 6f6a4ec..b5904cb 100644
--- a/src/flake8/options/config.py
+++ b/src/flake8/options/config.py
@@ -11,12 +11,12 @@ from typing import Tuple
 from flake8.options.manager import OptionManager
 
 LOG = logging.getLogger(__name__)
-DEFAULT_CANDIDATES = ("setup.cfg", "tox.ini", ".flake8")
-ADDITIONAL_CANDIDATES = ("flake8",)
-ADDITIONAL_LOCATIONS = (
+DEFAULT_CANDIDATES = ["setup.cfg", "tox.ini", ".flake8"]
+ADDITIONAL_CANDIDATES = ["flake8"]
+ADDITIONAL_LOCATIONS = [
     os.path.expanduser(r"~"),
     os.path.expanduser(r"~/.config"),
-)
+]
 
 
 def _is_config(path: str) -> bool:
diff --git a/tests/integration/test_main.py b/tests/integration/test_main.py
index 17b3f75..9aa4eb9 100644
--- a/tests/integration/test_main.py
+++ b/tests/integration/test_main.py
@@ -10,8 +10,8 @@ from flake8 import utils
 from flake8.main import cli
 from flake8.options import config
 
-config.ADDITIONAL_LOCATIONS = ()
-config.ADDITIONAL_CANDIDATES = ()
+config.ADDITIONAL_LOCATIONS = []
+config.ADDITIONAL_CANDIDATES = []
 
 
 def test_diff_option(tmpdir, capsys):
diff --git a/tests/unit/test_options_config.py b/tests/unit/test_options_config.py
index b89daf3..d4f7649 100644
--- a/tests/unit/test_options_config.py
+++ b/tests/unit/test_options_config.py
@@ -8,8 +8,8 @@ from flake8.options.manager import OptionManager
 
 
 def test_config_not_found_returns_none(tmp_path):
-    config.ADDITIONAL_LOCATIONS = ()
-    config.ADDITIONAL_CANDIDATES = ()
+    config.ADDITIONAL_LOCATIONS = []
+    config.ADDITIONAL_CANDIDATES = []
     assert config._find_config_file(str(tmp_path)) is None