diff --git a/.github/workflows/flake8.yml b/.github/workflows/flake8.yml
index f689082d1..06499c211 100644
--- a/.github/workflows/flake8.yml
+++ b/.github/workflows/flake8.yml
@@ -9,6 +9,9 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: 3.x
       - uses: TrueBrain/actions-flake8@v2
         with:
           plugins: >
diff --git a/.github/workflows/help-in-readme.yml b/.github/workflows/help-in-readme.yml
index 69551ec64..2b70097fc 100644
--- a/.github/workflows/help-in-readme.yml
+++ b/.github/workflows/help-in-readme.yml
@@ -6,6 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - run: pip install '.[flynt,isort]'
+      - name: Install uv
+        uses: astral-sh/setup-uv@v3
       - name: Verify that README contains output of darker --help
-        run: darker --verify-readme
+        run: uvx --from '.[flynt,isort]' darker --verify-readme
diff --git a/.github/workflows/isort.yml b/.github/workflows/isort.yml
index 32c156289..49fcf95a7 100644
--- a/.github/workflows/isort.yml
+++ b/.github/workflows/isort.yml
@@ -10,8 +10,10 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
+        with:
+          python-version: 3.x
       - run: pip install 'isort>=5.0.1'
-      - uses: wearerequired/lint-action@v2.3.0
+      - uses: akaihola/lint-action@master
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           isort: true
diff --git a/.github/workflows/mypy.yml b/.github/workflows/mypy.yml
index 8545afa59..dd60081f6 100644
--- a/.github/workflows/mypy.yml
+++ b/.github/workflows/mypy.yml
@@ -9,9 +9,13 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+      - name: Install uv
+        uses: astral-sh/setup-uv@v3
       - uses: actions/setup-python@v5
+        with:
+          python-version: 3.x
       - run: |
-          pip install -U \
+          uv pip install --system -U \
             black \
             git+https://github.com/akaihola/darkgraylib.git@main \
             flynt \
diff --git a/.github/workflows/pylint.yml b/.github/workflows/pylint.yml
index 72f53dcd1..7005eb088 100644
--- a/.github/workflows/pylint.yml
+++ b/.github/workflows/pylint.yml
@@ -9,10 +9,14 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+      - name: Install uv
+        uses: astral-sh/setup-uv@v3
       - uses: actions/setup-python@v5
+        with:
+          python-version: 3.x
       - name: Install dependencies for running Pylint
         run: |
-          pip install -U \
+          uv pip install --system -U \
             black \
             git+https://github.com/akaihola/darkgraylib.git@main \
             defusedxml \
@@ -23,8 +27,9 @@ jobs:
             requests \
             requests-cache \
             ruamel.yaml \
+            setuptools \
             toml
-          pip list
+          uv pip list --system
       - uses: wearerequired/lint-action@v2.3.0
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index 7e6a25c6f..96e4cd6e5 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -20,11 +20,11 @@ jobs:
       wheel-path: ${{ steps.get-darker-version.outputs.wheel-path }}
     steps:
       - uses: actions/checkout@v4
+      - name: Install uv
+        uses: astral-sh/setup-uv@v3
       - uses: actions/setup-python@v5
-      - name: Install wheel
-        run: python -m pip install wheel
       - name: Build wheel distribution
-        run: python setup.py bdist_wheel
+        run: uv build --wheel
       - name: Upload wheel for other jobs
         uses: actions/upload-artifact@v4
         with:
@@ -146,12 +146,12 @@ jobs:
       - build-wheel
     steps:
       - uses: actions/checkout@v4
+      - name: Install uv
+        uses: astral-sh/setup-uv@v3
       - uses: actions/setup-python@v5
-      - name: Install twine
-        run: python -m pip install twine
       - name: Download wheel uploaded by the build-wheel job
         uses: actions/download-artifact@v4.1.7
       - name: Build source distribution
-        run: python setup.py sdist
+        run: uv build --sdist
       - name: Validate distributions
-        run: twine check dist/*
+        run: uvx twine check dist/*
diff --git a/.github/workflows/pyupgrade.yml b/.github/workflows/pyupgrade.yml
index 0273248ec..22af5bbdf 100644
--- a/.github/workflows/pyupgrade.yml
+++ b/.github/workflows/pyupgrade.yml
@@ -9,12 +9,13 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+      - name: Install uv
+        uses: astral-sh/setup-uv@v3
       - uses: actions/setup-python@v5
-      - run: pip install pyupgrade
       - name: Ensure modern Python style using pyupgrade
         # This script is written in a Linux / macos / windows portable way
         run: |
-          python -c "
+          uvx --from pyupgrade python -c "
           import sys
           from pyupgrade._main import main
           from glob import glob
diff --git a/.github/workflows/safety.yml b/.github/workflows/safety.yml
index 4aab1bfd4..1d4d567c0 100644
--- a/.github/workflows/safety.yml
+++ b/.github/workflows/safety.yml
@@ -9,9 +9,9 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+      - name: Install uv
+        uses: astral-sh/setup-uv@v3
       - uses: actions/setup-python@v5
-      - run: pip install -U pip-tools
-      - run: pip-compile setup.cfg
-      - run: pip install -U safety
+      - run: uvx --from pip-tools pip-compile setup.cfg
       - name: Check dependencies for known security vulnerabilities using Safety
-        run: safety check --file requirements.txt
+        run: uvx safety check --file requirements.txt
diff --git a/.github/workflows/test-bump-version.yml b/.github/workflows/test-bump-version.yml
index 4cf90af6b..d02b0af4e 100644
--- a/.github/workflows/test-bump-version.yml
+++ b/.github/workflows/test-bump-version.yml
@@ -9,6 +9,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+      - name: Install uv
+        uses: astral-sh/setup-uv@v3
       - uses: actions/setup-python@v5
 
       - name: Make sure that `darkgray_bump_version` still finds all version strings
@@ -20,9 +22,7 @@ jobs:
         # This is used to update the call for reviewing pull requests
         # in `README.rst`.
         run: |
-          pip install \
-            https://github.com/akaihola/darkgray-dev-tools/archive/refs/heads/main.zip
-          darkgray_bump_version \
+          uvx --from=darkgray-dev-tools darkgray_bump_version \
             --minor \
             --dry-run \
             --token=${{ secrets.GITHUB_TOKEN }}
diff --git a/src/darker/black_diff.py b/src/darker/black_diff.py
index b9c106648..a47db055e 100644
--- a/src/darker/black_diff.py
+++ b/src/darker/black_diff.py
@@ -32,10 +32,12 @@
   based on whether reformats touch user-edited lines
 
 """
+
+from __future__ import annotations
+
 import inspect
 import logging
-from pathlib import Path
-from typing import Collection, Optional, Pattern, Set, Tuple, TypedDict, Union
+from typing import TYPE_CHECKING, Collection, Pattern, TypedDict
 
 # `FileMode as Mode` required to satisfy mypy==0.782. Strange.
 from black import FileMode as Mode
@@ -56,6 +58,9 @@
 from darkgraylib.config import ConfigurationError
 from darkgraylib.utils import TextDocument
 
+if TYPE_CHECKING:
+    from pathlib import Path
+
 __all__ = ["BlackConfig", "Mode", "run_black"]
 
 logger = logging.getLogger(__name__)
@@ -69,10 +74,10 @@ class BlackConfig(TypedDict, total=False):
     """Type definition for Black configuration dictionaries"""
 
     config: str
-    exclude: Pattern[str]
-    extend_exclude: Pattern[str]
-    force_exclude: Pattern[str]
-    target_version: Union[str, Set[str]]
+    exclude: Pattern[str] | None
+    extend_exclude: Pattern[str] | None
+    force_exclude: Pattern[str] | None
+    target_version: str | set[str]
     line_length: int
     skip_string_normalization: bool
     skip_magic_trailing_comma: bool
@@ -82,7 +87,7 @@ class BlackConfig(TypedDict, total=False):
 class BlackModeAttributes(TypedDict, total=False):
     """Type definition for items accepted by ``black.Mode``"""
 
-    target_versions: Set[TargetVersion]
+    target_versions: set[TargetVersion]
     line_length: int
     string_normalization: bool
     is_pyi: bool
@@ -90,7 +95,7 @@ class BlackModeAttributes(TypedDict, total=False):
     preview: bool
 
 
-def read_black_config(src: Tuple[str, ...], value: Optional[str]) -> BlackConfig:
+def read_black_config(src: tuple[str, ...], value: str | None) -> BlackConfig:
     """Read the black configuration from ``pyproject.toml``
 
     :param src: The source code files and directories to be processed by Darker
@@ -136,7 +141,7 @@ def filter_python_files(
     paths: Collection[Path],  # pylint: disable=unsubscriptable-object
     root: Path,
     black_config: BlackConfig,
-) -> Set[Path]:
+) -> set[Path]:
     """Get Python files and explicitly listed files not excluded by Black's config
 
     :param paths: Relative file/directory paths from CWD to Python sources
@@ -164,7 +169,7 @@ def filter_python_files(
             directories,
             root,
             include=DEFAULT_INCLUDE_RE,
-            exclude=black_config.get("exclude", DEFAULT_EXCLUDE_RE),
+            exclude=black_config.get("exclude") or DEFAULT_EXCLUDE_RE,
             extend_exclude=black_config.get("extend_exclude"),
             force_exclude=black_config.get("force_exclude"),
             report=Report(),