diff --git a/.github/dependabot.yml b/.github/dependabot.yml
deleted file mode 100644
index a1322e2..0000000
--- a/.github/dependabot.yml
+++ /dev/null
@@ -1,10 +0,0 @@
-version: 2
-updates:
-  - package-ecosystem: github-actions
-    directory: "/"
-    assignees:
-      - redeboer
-    labels:
-      - 🖱️ DX
-    schedule:
-      interval: monthly
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 24fea69..2c5622c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,7 +2,8 @@ name: CI
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
+  cancel-in-progress: |-
+    ${{ github.ref != format('refs/heads/{0}', github.event.repository.default_branch) }}
 
 env:
   PYTHONHASHSEED: "0"
diff --git a/.github/workflows/release-drafter.yml b/.github/workflows/release-drafter.yml
index d64f197..5234093 100644
--- a/.github/workflows/release-drafter.yml
+++ b/.github/workflows/release-drafter.yml
@@ -11,6 +11,6 @@ jobs:
   update_release_draft:
     runs-on: ubuntu-22.04
     steps:
-      - uses: release-drafter/release-drafter@v5
+      - uses: release-drafter/release-drafter@v6
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/requirements.yml b/.github/workflows/requirements.yml
index b2562f2..ec42f28 100644
--- a/.github/workflows/requirements.yml
+++ b/.github/workflows/requirements.yml
@@ -2,7 +2,8 @@ name: Requirements
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
+  cancel-in-progress: |-
+    ${{ github.ref != format('refs/heads/{0}', github.event.repository.default_branch) }}
 
 on:
   pull_request:
diff --git a/.gitpod.yml b/.gitpod.yml
index 3aab122..29d758d 100644
--- a/.gitpod.yml
+++ b/.gitpod.yml
@@ -1,6 +1,6 @@
 tasks:
-  - init: pyenv local 3.8
-  - init: pip install -c .constraints/py3.8.txt -e .[dev]
+  - init: pyenv local 3.9
+  - init: pip install -c .constraints/py3.9.txt -e .[dev]
 
 github:
   prebuilds:
@@ -22,7 +22,6 @@ vscode:
     - executablebookproject.myst-highlight
     - github.vscode-github-actions
     - github.vscode-pull-request-github
-    - ms-python.black-formatter
     - ms-python.mypy-type-checker
     - ms-python.python
     - ms-python.vscode-pylance
@@ -31,10 +30,9 @@ vscode:
     - ms-vsliveshare.vsliveshare
     - redhat.vscode-yaml
     - ryanluker.vscode-coverage-gutters
-    - Soulcode.vscode-unwanted-extensions
+    - soulcode.vscode-unwanted-extensions
     - stkb.rewrap
     - streetsidesoftware.code-spell-checker
     - tamasfe.even-better-toml
     - trentrand.git-commit-helper-vscode
-    - tyriar.sort-lines
     - yzhang.markdown-all-in-one
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 3ce5ea9..f1f0d45 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -13,6 +13,40 @@ repos:
       - id: check-hooks-apply
       - id: check-useless-excludes
 
+  - repo: https://github.com/kynan/nbstripout
+    rev: 0.7.1
+    hooks:
+      - id: nbstripout
+        args:
+          - --extra-keys
+          - |
+            cell.attachments
+            cell.metadata.code_folding
+            cell.metadata.id
+            cell.metadata.pycharm
+            cell.metadata.user_expressions
+            metadata.celltoolbar
+            metadata.colab.name
+            metadata.colab.provenance
+            metadata.interpreter
+            metadata.notify_time
+            metadata.toc
+            metadata.toc-autonumbering
+            metadata.toc-showcode
+            metadata.toc-showmarkdowntxt
+            metadata.toc-showtags
+            metadata.varInspector
+            metadata.vscode
+
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.3.0
+    hooks:
+      - id: ruff
+        args: [--fix]
+        types_or: [python, pyi, jupyter]
+      - id: ruff-format
+        types_or: [python, pyi, jupyter]
+
   - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v4.5.0
     hooks:
@@ -31,16 +65,22 @@ repos:
         args: ["--django"]
       - id: trailing-whitespace
 
-  - repo: https://github.com/psf/black-pre-commit-mirror
-    rev: 24.2.0
+  - repo: https://github.com/pre-commit/mirrors-prettier
+    rev: v4.0.0-alpha.8
     hooks:
-      - id: black
-      - id: black-jupyter
-        args:
-          - --line-length=85
-        types_or:
-          - jupyter
+      - id: prettier
+
+  - repo: https://github.com/ComPWA/mirrors-taplo
+    rev: v0.8.1
+    hooks:
+      - id: taplo
 
+  - repo: https://github.com/pappasam/toml-sort
+    rev: v0.23.1
+    hooks:
+      - id: toml-sort
+        args:
+          - --in-place
   - repo: https://github.com/ComPWA/policy
     rev: 0.2.6
     hooks:
@@ -77,56 +117,8 @@ repos:
         types:
           - python
 
-  - repo: https://github.com/kynan/nbstripout
-    rev: 0.7.1
-    hooks:
-      - id: nbstripout
-        args:
-          - --extra-keys
-          - |
-            cell.attachments
-            cell.metadata.code_folding
-            cell.metadata.id
-            cell.metadata.pycharm
-            cell.metadata.user_expressions
-            metadata.celltoolbar
-            metadata.colab.name
-            metadata.colab.provenance
-            metadata.interpreter
-            metadata.notify_time
-            metadata.toc
-            metadata.toc-autonumbering
-            metadata.toc-showcode
-            metadata.toc-showmarkdowntxt
-            metadata.toc-showtags
-            metadata.varInspector
-            metadata.vscode
-
-  - repo: https://github.com/pre-commit/mirrors-prettier
-    rev: v4.0.0-alpha.8
-    hooks:
-      - id: prettier
-
   - repo: https://github.com/ComPWA/mirrors-pyright
     rev: v1.1.352
     hooks:
       - id: pyright
 
-  - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.3.0
-    hooks:
-      - id: ruff
-        args: [--fix]
-        types_or: [python, pyi, jupyter]
-
-  - repo: https://github.com/ComPWA/mirrors-taplo
-    rev: v0.8.1
-    hooks:
-      - id: taplo
-
-  - repo: https://github.com/pappasam/toml-sort
-    rev: v0.23.1
-    hooks:
-      - id: toml-sort
-        args:
-          - --in-place
diff --git a/.vscode/extensions.json b/.vscode/extensions.json
index 65d9a54..82d6e46 100644
--- a/.vscode/extensions.json
+++ b/.vscode/extensions.json
@@ -8,7 +8,6 @@
     "executablebookproject.myst-highlight",
     "github.vscode-github-actions",
     "github.vscode-pull-request-github",
-    "ms-python.black-formatter",
     "ms-python.mypy-type-checker",
     "ms-python.python",
     "ms-python.vscode-pylance",
@@ -17,21 +16,22 @@
     "ms-vsliveshare.vsliveshare",
     "redhat.vscode-yaml",
     "ryanluker.vscode-coverage-gutters",
-    "Soulcode.vscode-unwanted-extensions",
+    "soulcode.vscode-unwanted-extensions",
     "stkb.rewrap",
     "streetsidesoftware.code-spell-checker",
     "tamasfe.even-better-toml",
     "trentrand.git-commit-helper-vscode",
-    "tyriar.sort-lines",
     "yzhang.markdown-all-in-one"
   ],
   "unwantedRecommendations": [
     "bungcip.better-toml",
     "davidanson.vscode-markdownlint",
     "garaioag.garaio-vscode-unwanted-recommendations",
+    "ms-python.black-formatter",
     "ms-python.flake8",
     "ms-python.isort",
     "ms-python.pylint",
-    "travisillig.vscode-json-stable-stringify"
+    "travisillig.vscode-json-stable-stringify",
+    "tyriar.sort-lines"
   ]
 }
diff --git a/.vscode/settings.json b/.vscode/settings.json
index 0b14d0d..5aa7320 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,6 +1,8 @@
 {
   "[git-commit]": {
-    "editor.rulers": [72],
+    "editor.rulers": [
+      72
+    ],
     "rewrap.wrappingColumn": 72
   },
   "[ipynb]": {
@@ -19,14 +21,17 @@
     "editor.codeActionsOnSave": {
       "source.organizeImports": "explicit"
     },
-    "editor.defaultFormatter": "ms-python.black-formatter",
-    "editor.rulers": [88]
+    "editor.defaultFormatter": "charliermarsh.ruff",
+    "editor.rulers": [
+      88
+    ]
   },
   "[yaml]": {
     "editor.defaultFormatter": "esbenp.prettier-vscode"
   },
-  "black-formatter.importStrategy": "fromEnvironment",
-  "coverage-gutters.coverageFileNames": ["coverage.xml"],
+  "coverage-gutters.coverageFileNames": [
+    "coverage.xml"
+  ],
   "coverage-gutters.coverageReportFileName": "**/htmlcov/index.html",
   "coverage-gutters.showGutterCoverage": false,
   "coverage-gutters.showLineCoverage": true,
@@ -34,28 +39,42 @@
   "diffEditor.experimental.showMoves": true,
   "editor.formatOnSave": true,
   "git.rebaseWhenSync": true,
-  "github-actions.workflows.pinned.workflows": [".github/workflows/ci.yml"],
+  "github-actions.workflows.pinned.workflows": [
+    ".github/workflows/ci.yml"
+  ],
   "gitlens.telemetry.enabled": false,
   "livePreview.defaultPreviewPath": "docs/_build/html",
   "multiDiffEditor.experimental.enabled": true,
-  "mypy-type-checker.args": ["--config-file=${workspaceFolder}/pyproject.toml"],
+  "mypy-type-checker.args": [
+    "--config-file=${workspaceFolder}/pyproject.toml"
+  ],
   "mypy-type-checker.importStrategy": "fromEnvironment",
+  "notebook.codeActionsOnSave": {
+    "notebook.source.organizeImports": "explicit"
+  },
+  "notebook.formatOnSave.enabled": true,
   "notebook.gotoSymbols.showAllSymbols": true,
   "python.analysis.autoImportCompletions": false,
   "python.analysis.inlayHints.pytestParameters": true,
   "python.analysis.typeCheckingMode": "strict",
   "python.languageServer": "Pylance",
-  "python.testing.pytestArgs": ["--color=no", "--no-cov"],
+  "python.testing.pytestArgs": [
+    "--color=no",
+    "--no-cov"
+  ],
   "python.testing.pytestEnabled": true,
   "python.testing.unittestEnabled": false,
+  "redhat.telemetry.enabled": false,
   "rewrap.wrappingColumn": 88,
   "ruff.enable": true,
+  "ruff.importStrategy": "fromEnvironment",
   "ruff.organizeImports": true,
   "search.exclude": {
     "*/.pydocstyle": true,
     ".constraints/*.txt": true,
     "tests/**/__init__.py": true
   },
+  "telemetry.telemetryLevel": "off",
   "yaml.schemas": {
     "https://json.schemastore.org/github-workflow.json": "file:///home/redeboer/dev/redeboer/PawianTools/.github/workflows/requirements.yml"
   }
diff --git a/README.md b/README.md
index faa9205..a42b62a 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,6 @@
 <br>
 [![pre-commit](https://img.shields.io/badge/pre--commit-enabled-brightgreen)](https://github.com/pre-commit/pre-commit)
 [![Prettier](https://camo.githubusercontent.com/687a8ae8d15f9409617d2cc5a30292a884f6813a/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f636f64655f7374796c652d70726574746965722d6666363962342e7376673f7374796c653d666c61742d737175617265)](https://prettier.io/)
-[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 [![Ruff](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/charliermarsh/ruff/main/assets/badge/v2.json)](https://github.com/astral-sh/ruff)
 
 Go to [redeboer.github.io/PawianTools](https://redeboer.github.io/PawianTools) to view
diff --git a/docs/conf.py b/docs/conf.py
index 66a2379..3fed0ba 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -15,12 +15,14 @@
     set_intersphinx_version_remapping,
 )
 
-set_intersphinx_version_remapping({
-    "ipython": {
-        "8.12.2": "8.12.1",
-        "8.12.3": "8.12.1",
-    },
-})
+set_intersphinx_version_remapping(
+    {
+        "ipython": {
+            "8.12.2": "8.12.1",
+            "8.12.3": "8.12.1",
+        },
+    }
+)
 
 BRANCH = get_branch_name()
 ORGANIZATION = "redeboer"
@@ -45,10 +47,12 @@
     "members": True,
     "undoc-members": True,
     "show-inheritance": True,
-    "special-members": ", ".join([
-        "__call__",
-        "__eq__",
-    ]),
+    "special-members": ", ".join(
+        [
+            "__call__",
+            "__eq__",
+        ]
+    ),
 }
 autodoc_member_order = "bysource"
 autodoc_typehints_format = "short"
diff --git a/environment.yml b/environment.yml
index 0610a07..7c4effc 100644
--- a/environment.yml
+++ b/environment.yml
@@ -4,8 +4,8 @@ channels:
 dependencies:
   - graphviz # for binder
   - pip
-  - python==3.8.*
+  - python==3.9.*
   - pip:
-      - -c .constraints/py3.8.txt -e .[dev]
+      - -c .constraints/py3.9.txt -e .[dev]
 variables:
   PRETTIER_LEGACY_CLI: "1"
diff --git a/pyproject.toml b/pyproject.toml
index 21d5d58..6710377 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -68,17 +68,14 @@ doc = [
     "sphinx-thebe",
     "sphinx-togglebutton",
 ]
-format = [
-    "black",
-]
 jupyter = [
+    "black",
     "isort",
     "jupyterlab",
     "jupyterlab-code-formatter",
     "jupyterlab-git",
     "jupyterlab-lsp",
     "jupyterlab-myst",
-    "jupyterlab-myst",
     "python-lsp-ruff",
     "python-lsp-server[rope]",
 ]
@@ -93,8 +90,9 @@ lint = [
 sty = [
     "pawian-tools[format]",
     "pawian-tools[lint]",
-    "pawian-tools[test]", # for pytest type hints
+    "pawian-tools[test]",
     "pre-commit",
+    "ruff",
 ]
 test = [
     "nbmake",
@@ -128,31 +126,6 @@ where = ["src"]
 [tool.setuptools_scm]
 write_to = "src/pawian/version.py"
 
-[tool.black]
-exclude = '''
-/(
-    .*\.egg-info
-    | .*build
-    | \.eggs
-    | \.git
-    | \.pytest_cache
-    | \.tox
-    | \.venv
-    | \.vscode
-    | dist
-)/
-'''
-include = '\.pyi?$'
-preview = true
-target-version = [
-    "py310",
-    "py311",
-    "py312",
-    "py37",
-    "py38",
-    "py39",
-]
-
 [tool.coverage.report]
 exclude_also = [
     "if TYPE_CHECKING:",
@@ -251,6 +224,19 @@ testpaths = [
 
 [tool.ruff]
 extend-include = ["*.ipynb"]
+preview = true
+show-fixes = true
+src = [
+    "src",
+    "tests",
+]
+target-version = "py37"
+
+[tool.ruff.format]
+docstring-code-format = true
+line-ending = "lf"
+
+[tool.ruff.lint]
 extend-select = [
     "A",
     "B",
@@ -294,18 +280,17 @@ ignore = [
     "D407",
     "D416",
     "E501",
+    "ISC001",
+    "PLW1514",
     "SIM108",
     "UP036",
 ]
-show-fixes = true
-src = [
-    "src",
-    "tests",
-]
-target-version = "py37"
 task-tags = ["cspell"]
 
-[tool.ruff.per-file-ignores]
+[tool.ruff.lint.isort]
+split-on-trailing-comma = false
+
+[tool.ruff.lint.per-file-ignores]
 "*.ipynb" = [
     "B018",
     "C90",
@@ -339,13 +324,15 @@ task-tags = ["cspell"]
     "D",
     "INP001",
     "PGH001",
+    "PLC2701",
     "PLR0913",
     "PLR2004",
+    "PLR6301",
     "S101",
     "T20",
 ]
 
-[tool.ruff.pydocstyle]
+[tool.ruff.lint.pydocstyle]
 convention = "google"
 
 [tool.tomlsort]
diff --git a/src/boostcfg/lineparser.py b/src/boostcfg/lineparser.py
index 31a8681..caff38f 100644
--- a/src/boostcfg/lineparser.py
+++ b/src/boostcfg/lineparser.py
@@ -6,8 +6,8 @@
     "get_key_value_pair",
     "is_commented",
     "is_empty",
-    "strip_comment",
     "string_to_value",
+    "strip_comment",
 ]
 
 
diff --git a/tests/boostcfg/test_boostcfg.py b/tests/boostcfg/test_boostcfg.py
index 2138657..bcd7a87 100644
--- a/tests/boostcfg/test_boostcfg.py
+++ b/tests/boostcfg/test_boostcfg.py
@@ -15,7 +15,7 @@ def test_append_value_from_line():
     cfg.append_value_from_line("true_bool = true")
     assert cfg["key"] == "value"
     assert cfg["float"] == 3.14
-    assert cfg["int"] == int(-11)
+    assert cfg["int"] == -11
     assert not cfg["false_bool"]
     assert cfg["true_bool"]
     cfg.append_value_from_line("key = value")