diff --git a/.github/SECURITY.md b/.github/SECURITY.md
index dbdabeb1..00d4d5e4 100644
--- a/.github/SECURITY.md
+++ b/.github/SECURITY.md
@@ -9,11 +9,10 @@
 
 ## Reporting a Vulnerability
 
-If you believe you have identified a security issue with Python-dotenv, please email
+If you believe you have identified a security issue with python-dotenv, please email
 python-dotenv@saurabh-kumar.com. A maintainer will contact you acknowledging the report
 and how to continue.
 
 Be sure to include as much detail as necessary in your report. As with reporting normal
 issues, a minimal reproducible example will help the maintainers address the issue faster.
-If you are able, you may also include a fix for the issue generated with `git
-format-patch`.
+If you are able, you may also include a fix for the issue generated with `git format-patch`.
diff --git a/src/dotenv/main.py b/src/dotenv/main.py
index 052de054..0c81bba5 100644
--- a/src/dotenv/main.py
+++ b/src/dotenv/main.py
@@ -7,8 +7,7 @@
 import tempfile
 from collections import OrderedDict
 from contextlib import contextmanager
-from typing import (IO, Dict, Iterable, Iterator, Mapping, Optional, Tuple,
-                    Union)
+from typing import IO, Dict, Iterable, Iterator, Mapping, Optional, Tuple, Union
 
 from .parser import Binding, parse_stream
 from .variables import parse_variables
@@ -17,7 +16,7 @@
 # These paths may flow to `open()` and `shutil.move()`; `shutil.move()`
 # only accepts string paths, not byte paths or file descriptors. See
 # https://github.com/python/typeshed/pull/6832.
-StrPath = Union[str, 'os.PathLike[str]']
+StrPath = Union[str, "os.PathLike[str]"]
 
 logger = logging.getLogger(__name__)
 
@@ -26,7 +25,7 @@ def with_warn_for_invalid_lines(mappings: Iterator[Binding]) -> Iterator[Binding
     for mapping in mappings:
         if mapping.error:
             logger.warning(
-                "Python-dotenv could not parse statement starting at line %s",
+                "python-dotenv could not parse statement starting at line %s",
                 mapping.original.line,
             )
         yield mapping
@@ -60,10 +59,10 @@ def _get_stream(self) -> Iterator[IO[str]]:
         else:
             if self.verbose:
                 logger.info(
-                    "Python-dotenv could not find configuration file %s.",
-                    self.dotenv_path or '.env',
+                    "python-dotenv could not find configuration file %s.",
+                    self.dotenv_path or ".env",
                 )
-            yield io.StringIO('')
+            yield io.StringIO("")
 
     def dict(self) -> Dict[str, Optional[str]]:
         """Return dotenv as dict"""
@@ -73,7 +72,9 @@ def dict(self) -> Dict[str, Optional[str]]:
         raw_values = self.parse()
 
         if self.interpolate:
-            self._dict = OrderedDict(resolve_variables(raw_values, override=self.override))
+            self._dict = OrderedDict(
+                resolve_variables(raw_values, override=self.override)
+            )
         else:
             self._dict = OrderedDict(raw_values)
 
@@ -101,8 +102,7 @@ def set_as_environment_variables(self) -> bool:
         return True
 
     def get(self, key: str) -> Optional[str]:
-        """
-        """
+        """ """
         data = self.dict()
 
         if key in data:
@@ -166,9 +166,8 @@ def set_key(
     if quote_mode not in ("always", "auto", "never"):
         raise ValueError(f"Unknown quote_mode: {quote_mode}")
 
-    quote = (
-        quote_mode == "always"
-        or (quote_mode == "auto" and not value_to_set.isalnum())
+    quote = quote_mode == "always" or (
+        quote_mode == "auto" and not value_to_set.isalnum()
     )
 
     if quote:
@@ -176,7 +175,7 @@ def set_key(
     else:
         value_out = value_to_set
     if export:
-        line_out = f'export {key_to_set}={value_out}\n'
+        line_out = f"export {key_to_set}={value_out}\n"
     else:
         line_out = f"{key_to_set}={value_out}\n"
 
@@ -223,7 +222,9 @@ def unset_key(
                 dest.write(mapping.original.string)
 
     if not removed:
-        logger.warning("Key %s not removed from %s - key doesn't exist.", key_to_unset, dotenv_path)
+        logger.warning(
+            "Key %s not removed from %s - key doesn't exist.", key_to_unset, dotenv_path
+        )
         return None, key_to_unset
 
     return removed, key_to_unset
@@ -235,7 +236,7 @@ def resolve_variables(
 ) -> Mapping[str, Optional[str]]:
     new_values: Dict[str, Optional[str]] = {}
 
-    for (name, value) in values:
+    for name, value in values:
         if value is None:
             result = None
         else:
@@ -259,7 +260,7 @@ def _walk_to_root(path: str) -> Iterator[str]:
     Yield directories starting from the given directory up to the root
     """
     if not os.path.exists(path):
-        raise IOError('Starting path not found')
+        raise IOError("Starting path not found")
 
     if os.path.isfile(path):
         path = os.path.dirname(path)
@@ -273,7 +274,7 @@ def _walk_to_root(path: str) -> Iterator[str]:
 
 
 def find_dotenv(
-    filename: str = '.env',
+    filename: str = ".env",
     raise_error_if_not_found: bool = False,
     usecwd: bool = False,
 ) -> str:
@@ -284,14 +285,14 @@ def find_dotenv(
     """
 
     def _is_interactive():
-        """ Decide whether this is running in a REPL or IPython notebook """
+        """Decide whether this is running in a REPL or IPython notebook"""
         try:
-            main = __import__('__main__', None, None, fromlist=['__file__'])
+            main = __import__("__main__", None, None, fromlist=["__file__"])
         except ModuleNotFoundError:
             return False
-        return not hasattr(main, '__file__')
+        return not hasattr(main, "__file__")
 
-    if usecwd or _is_interactive() or getattr(sys, 'frozen', False):
+    if usecwd or _is_interactive() or getattr(sys, "frozen", False):
         # Should work without __file__, e.g. in REPL or IPython notebook.
         path = os.getcwd()
     else:
@@ -313,9 +314,9 @@ def _is_interactive():
             return check_path
 
     if raise_error_if_not_found:
-        raise IOError('File not found')
+        raise IOError("File not found")
 
-    return ''
+    return ""
 
 
 def load_dotenv(
diff --git a/tests/test_main.py b/tests/test_main.py
index fd5e3903..2d63eec1 100644
--- a/tests/test_main.py
+++ b/tests/test_main.py
@@ -28,9 +28,9 @@ def test_set_key_no_file(tmp_path):
         ("", "a", "", (True, "a", ""), "a=''\n"),
         ("", "a", "b", (True, "a", "b"), "a='b'\n"),
         ("", "a", "'b'", (True, "a", "'b'"), "a='\\'b\\''\n"),
-        ("", "a", "\"b\"", (True, "a", '"b"'), "a='\"b\"'\n"),
+        ("", "a", '"b"', (True, "a", '"b"'), "a='\"b\"'\n"),
         ("", "a", "b'c", (True, "a", "b'c"), "a='b\\'c'\n"),
-        ("", "a", "b\"c", (True, "a", "b\"c"), "a='b\"c'\n"),
+        ("", "a", 'b"c', (True, "a", 'b"c'), "a='b\"c'\n"),
         ("a=b", "a", "c", (True, "a", "c"), "a='c'\n"),
         ("a=b\n", "a", "c", (True, "a", "c"), "a='c'\n"),
         ("a=b\n\n", "a", "c", (True, "a", "c"), "a='c'\n\n"),
@@ -75,20 +75,20 @@ def test_get_key_no_file(tmp_path):
     nx_path = tmp_path / "nx"
     logger = logging.getLogger("dotenv.main")
 
-    with mock.patch.object(logger, "info") as mock_info, \
-            mock.patch.object(logger, "warning") as mock_warning:
+    with (
+        mock.patch.object(logger, "info") as mock_info,
+        mock.patch.object(logger, "warning") as mock_warning,
+    ):
         result = dotenv.get_key(nx_path, "foo")
 
     assert result is None
     mock_info.assert_has_calls(
         calls=[
-            mock.call("Python-dotenv could not find configuration file %s.", nx_path)
+            mock.call("python-dotenv could not find configuration file %s.", nx_path)
         ],
     )
     mock_warning.assert_has_calls(
-        calls=[
-            mock.call("Key %s not found in %s.", "foo", nx_path)
-        ],
+        calls=[mock.call("Key %s not found in %s.", "foo", nx_path)],
     )
 
 
@@ -249,10 +249,12 @@ def test_load_dotenv_no_file_verbose():
     logger = logging.getLogger("dotenv.main")
 
     with mock.patch.object(logger, "info") as mock_info:
-        result = dotenv.load_dotenv('.does_not_exist', verbose=True)
+        result = dotenv.load_dotenv(".does_not_exist", verbose=True)
 
     assert result is False
-    mock_info.assert_called_once_with("Python-dotenv could not find configuration file %s.", ".does_not_exist")
+    mock_info.assert_called_once_with(
+        "python-dotenv could not find configuration file %s.", ".does_not_exist"
+    )
 
 
 @mock.patch.dict(os.environ, {"a": "c"}, clear=True)
@@ -317,21 +319,23 @@ def test_load_dotenv_file_stream(dotenv_path):
 
 
 def test_load_dotenv_in_current_dir(tmp_path):
-    dotenv_path = tmp_path / '.env'
-    dotenv_path.write_bytes(b'a=b')
-    code_path = tmp_path / 'code.py'
-    code_path.write_text(textwrap.dedent("""
+    dotenv_path = tmp_path / ".env"
+    dotenv_path.write_bytes(b"a=b")
+    code_path = tmp_path / "code.py"
+    code_path.write_text(
+        textwrap.dedent("""
         import dotenv
         import os
 
         dotenv.load_dotenv(verbose=True)
         print(os.environ['a'])
-    """))
+    """)
+    )
     os.chdir(tmp_path)
 
     result = sh.Command(sys.executable)(code_path)
 
-    assert result == 'b\n'
+    assert result == "b\n"
 
 
 def test_dotenv_values_file(dotenv_path):
@@ -352,30 +356,23 @@ def test_dotenv_values_file(dotenv_path):
         ({"b": "c"}, "a=${b}", True, {"a": "c"}),
         ({"b": "c"}, "a=${b:-d}", False, {"a": "${b:-d}"}),
         ({"b": "c"}, "a=${b:-d}", True, {"a": "c"}),
-
         # Defined in file
         ({}, "b=c\na=${b}", True, {"a": "c", "b": "c"}),
-
         # Undefined
         ({}, "a=${b}", True, {"a": ""}),
         ({}, "a=${b:-d}", True, {"a": "d"}),
-
         # With quotes
         ({"b": "c"}, 'a="${b}"', True, {"a": "c"}),
         ({"b": "c"}, "a='${b}'", True, {"a": "c"}),
-
         # With surrounding text
         ({"b": "c"}, "a=x${b}y", True, {"a": "xcy"}),
-
         # Self-referential
         ({"a": "b"}, "a=${a}", True, {"a": "b"}),
         ({}, "a=${a}", True, {"a": ""}),
         ({"a": "b"}, "a=${a:-c}", True, {"a": "b"}),
         ({}, "a=${a:-c}", True, {"a": "c"}),
-
         # Reused
         ({"b": "c"}, "a=${b}${b}", True, {"a": "cc"}),
-
         # Re-defined and used in file
         ({"b": "c"}, "b=d\na=${b}", True, {"a": "d", "b": "d"}),
         ({}, "a=b\na=c\nd=${a}", True, {"a": "c", "d": "c"}),