diff --git a/.github/workflows/pyupgrade.yml b/.github/workflows/pyupgrade.yml
index d7bbd3884..a9f1d762f 100644
--- a/.github/workflows/pyupgrade.yml
+++ b/.github/workflows/pyupgrade.yml
@@ -19,5 +19,5 @@ jobs:
           from pyupgrade._main import main
           from glob import glob
           files = glob('**/*.py', recursive=True)
-          sys.exit(main(files + ['--py37-plus']))
+          sys.exit(main(files + ['--py38-plus']))
           " || ( git diff ; false )
diff --git a/action/tests/test_main.py b/action/tests/test_main.py
index 20db3e6e5..e0d726154 100644
--- a/action/tests/test_main.py
+++ b/action/tests/test_main.py
@@ -220,9 +220,8 @@ def test_runs_darker(tmp_path, env, expect):
         run_module("main")
 
     darker = str(tmp_path / ".darker-env" / BIN / "darker")
-    # We can change `c[0][0][0]` to `c.args[0][0]` after dropping Python 3.7 support.
     # This gets the first list item of the first positional argument to the `run` call.
-    assert darker in [c[0][0][0] for c in main_patch.subprocess.run.call_args_list]
+    assert darker in [c.args[0][0] for c in main_patch.subprocess.run.call_args_list]
 
 
 def test_error_if_pip_fails(tmp_path, capsys):
diff --git a/release_tools/bump_version.py b/release_tools/bump_version.py
index 895c852ef..9867a4ac4 100644
--- a/release_tools/bump_version.py
+++ b/release_tools/bump_version.py
@@ -22,19 +22,13 @@
 import sys
 from datetime import date
 from pathlib import Path
-from typing import Dict, List, Match, Optional, Tuple
+from typing import Dict, List, Match, Optional, Tuple, TypedDict
 from warnings import warn
 
 import click
 import requests
 from packaging.version import Version
 
-if sys.version_info >= (3, 8):
-    from typing import TypedDict
-else:
-    from typing_extensions import TypedDict
-
-
 VERSION_PY_PATH = "src/darker/version.py"
 
 
diff --git a/release_tools/update_contributors.py b/release_tools/update_contributors.py
index 74d144230..7acbad12a 100644
--- a/release_tools/update_contributors.py
+++ b/release_tools/update_contributors.py
@@ -14,14 +14,13 @@
 # pylint: disable=too-few-public-methods,abstract-method
 
 import re
-import sys
 import xml.etree.ElementTree as ET  # nosec
 from dataclasses import dataclass
 from functools import total_ordering
 from itertools import groupby
 from pathlib import Path
 from textwrap import dedent, indent
-from typing import Any, Dict, Iterable, List, MutableMapping, Optional, cast
+from typing import Any, Dict, Iterable, List, MutableMapping, Optional, TypedDict, cast
 
 import click
 import defusedxml.ElementTree
@@ -30,11 +29,6 @@
 from requests_cache.session import CachedSession
 from ruamel import yaml
 
-if sys.version_info >= (3, 8):
-    from typing import TypedDict
-else:
-    from typing_extensions import TypedDict
-
 
 @click.group()
 def cli() -> None:
diff --git a/setup.cfg b/setup.cfg
index 1c3c919ed..e17d91bc4 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -10,7 +10,6 @@ description = Apply Black formatting only in regions changed since last commit
 long_description_content_type = text/x-rst
 classifiers =
     Programming Language :: Python :: 3 :: Only
-    Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
@@ -30,10 +29,9 @@ install_requires =
     # NOTE: remember to keep `constraints-oldest.txt` in sync with these
     black>=21.5b1,<24.2  # upper limit until incompatibility fixed
     toml>=0.10.0
-    typing-extensions ; python_version < "3.8"
 # NOTE: remember to keep `.github/workflows/python-package.yml` in sync
 #       with the minimum required Python version
-python_requires = >=3.7
+python_requires = >=3.8
 
 [options.packages.find]
 where = src
diff --git a/src/darker/black_diff.py b/src/darker/black_diff.py
index 77c962b19..4fc42963c 100644
--- a/src/darker/black_diff.py
+++ b/src/darker/black_diff.py
@@ -34,9 +34,8 @@
 """
 import inspect
 import logging
-import sys
 from pathlib import Path
-from typing import Collection, Optional, Pattern, Set, Tuple, Union
+from typing import Collection, Optional, Pattern, Set, Tuple, TypedDict, Union
 
 # `FileMode as Mode` required to satisfy mypy==0.782. Strange.
 from black import FileMode as Mode
@@ -57,11 +56,6 @@
 from darker.config import ConfigurationError
 from darker.utils import TextDocument
 
-if sys.version_info >= (3, 8):
-    from typing import TypedDict
-else:
-    from typing_extensions import TypedDict
-
 __all__ = ["BlackConfig", "Mode", "run_black"]
 
 logger = logging.getLogger(__name__)
diff --git a/src/darker/config.py b/src/darker/config.py
index 702c1f0a3..02f47584c 100644
--- a/src/darker/config.py
+++ b/src/darker/config.py
@@ -2,21 +2,15 @@
 
 import logging
 import os
-import sys
 from argparse import ArgumentParser, Namespace
 from dataclasses import dataclass, field
 from pathlib import Path
-from typing import Dict, Iterable, List, Optional, Set, Union, cast
+from typing import Dict, Iterable, List, Optional, Set, TypedDict, Union, cast
 
 import toml
 
 from darker.black_compat import find_project_root
 
-if sys.version_info >= (3, 8):
-    from typing import TypedDict
-else:
-    from typing_extensions import TypedDict
-
 
 class TomlArrayLinesEncoder(toml.TomlEncoder):  # type: ignore
     """Format TOML so list items are each on their own line"""
diff --git a/src/darker/git.py b/src/darker/git.py
index 160b745b8..370a92777 100644
--- a/src/darker/git.py
+++ b/src/darker/git.py
@@ -29,19 +29,6 @@
 from darker.multiline_strings import get_multiline_string_ranges
 from darker.utils import GIT_DATEFORMAT, TextDocument
 
-if sys.version_info < (3, 8):
-
-    def shlex_join(split_command: Iterable[str]) -> str:
-        """Backport `shlex.join` for Python 3.7
-
-        :param split_command: The elements on the command line
-        :return: The command line as one string, with appropriate quoting
-
-        """
-        return " ".join(shlex.quote(arg) for arg in split_command)
-
-else:
-    shlex_join = shlex.join
 
 logger = logging.getLogger(__name__)
 
@@ -338,7 +325,7 @@ def _git_check_output(
     encoding: Optional[str] = None,
 ) -> Union[str, bytes]:
     """Log command line, run Git, return stdout, exit with 123 on error"""
-    logger.debug("[%s]$ git %s", cwd, shlex_join(cmd))
+    logger.debug("[%s]$ git %s", cwd, shlex.join(cmd))
     try:
         return check_output(  # nosec
             ["git"] + cmd,
diff --git a/src/darker/import_sorting.py b/src/darker/import_sorting.py
index 38bb84090..95d3f7867 100644
--- a/src/darker/import_sorting.py
+++ b/src/darker/import_sorting.py
@@ -1,9 +1,8 @@
 """Helpers for invoking ``isort`` and acting on its output"""
 
 import logging
-import sys
 from pathlib import Path
-from typing import Any, Collection, List, Optional
+from typing import Any, Collection, List, Optional, TypedDict
 
 from darker.black_compat import find_project_root
 from darker.diff import diff_chunks
@@ -11,12 +10,6 @@
 from darker.git import EditedLinenumsDiffer
 from darker.utils import DiffChunk, TextDocument, glob_any
 
-if sys.version_info >= (3, 8):
-    from typing import TypedDict
-else:
-    from typing_extensions import TypedDict
-
-
 try:
     import isort
 
diff --git a/src/darker/linting.py b/src/darker/linting.py
index 1e285d68f..fcd514266 100644
--- a/src/darker/linting.py
+++ b/src/darker/linting.py
@@ -51,10 +51,9 @@
     git_get_content_at_revision,
     git_get_root,
     git_rev_parse,
-    shlex_join,
 )
 from darker.highlighting import colorize
-from darker.utils import WINDOWS, fix_py37_win_tempdir_permissions
+from darker.utils import WINDOWS
 
 logger = logging.getLogger(__name__)
 
@@ -300,7 +299,7 @@ def _check_linter_output(
     else:
         cmdline_parts = cmdline
     cmdline_and_paths = cmdline_parts + [str(path) for path in sorted(paths)]
-    logger.debug("[%s]$ %s", root, shlex_join(cmdline_and_paths))
+    logger.debug("[%s]$ %s", root, shlex.join(cmdline_and_paths))
     with Popen(  # nosec
         cmdline_and_paths,
         stdout=PIPE,
@@ -336,7 +335,7 @@ def run_linter(  # pylint: disable=too-many-locals
         cmdline_str = cmdline
     else:
         linter = cmdline[0]
-        cmdline_str = shlex_join(cmdline)
+        cmdline_str = shlex.join(cmdline)
     # 10. run a linter subprocess for files mentioned on the command line which may be
     #     modified or unmodified, to get current linting status in the working tree
     #     (steps 10.-12. are optional)
@@ -534,7 +533,6 @@ def _get_messages_from_linters_for_baseline(
                 make_linter_env(root, rev1_commit),
                 normalize_whitespace,
             )
-            fix_py37_win_tempdir_permissions(tmpdir)
     return result
 
 
diff --git a/src/darker/tests/conftest.py b/src/darker/tests/conftest.py
index 2760ec90d..88cf210fb 100644
--- a/src/darker/tests/conftest.py
+++ b/src/darker/tests/conftest.py
@@ -10,7 +10,6 @@
 from black import find_project_root as black_find_project_root
 
 from darker.git import _git_check_output_lines, git_get_version
-from darker.utils import fix_py37_win_tempdir_permissions
 
 
 class GitRepoFixture:
@@ -122,8 +121,6 @@ def git_repo(tmp_path, monkeypatch):
 
     yield repository
 
-    fix_py37_win_tempdir_permissions(repository.root)
-
 
 @pytest.fixture
 def find_project_root_cache_clear():
diff --git a/src/darker/utils.py b/src/darker/utils.py
index 812b3a302..a992240fc 100644
--- a/src/darker/utils.py
+++ b/src/darker/utils.py
@@ -2,13 +2,12 @@
 
 import io
 import logging
-import os
 import sys
 import tokenize
 from datetime import datetime
 from itertools import chain
 from pathlib import Path
-from typing import Collection, Iterable, List, Tuple, Union
+from typing import Collection, Iterable, List, Tuple
 
 logger = logging.getLogger(__name__)
 
@@ -240,27 +239,3 @@ def glob_any(path: Path, patterns: Collection[str]) -> bool:
 
     """
     return any(path.glob(pattern) for pattern in patterns)
-
-
-def fix_py37_win_tempdir_permissions(dirpath: Union[str, Path]) -> None:
-    """Work around a `tempfile` clean-up issue on Windows with Python 3.7
-
-    Call this before exiting a ``with TemporaryDirectory():`` block or in teardown for
-    a Pytest fixture which creates a temporary directory.
-
-    See discussion in https://github.com/akaihola/darker/pull/393
-    Solution borrowed from https://github.com/python/cpython/pull/10320
-
-    :param dirpath: The root path of the temporary directory
-
-    """
-    if not WINDOWS or sys.version_info >= (3, 8):
-        return
-    for root, dirs, files in os.walk(dirpath):
-        for name in dirs + files:
-            path = os.path.join(root, name)
-            try:
-                os.chflags(path, 0)  # type: ignore[attr-defined]
-            except AttributeError:
-                pass
-            os.chmod(path, 0o700)