diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index be006de9..4b5e1c76 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -8,6 +8,6 @@ updates:
     groups:
       github-actions:
         patterns:
-          - "*"  # Group all Actions updates into a single larger pull request
+          - "*" # Group all Actions updates into a single larger pull request
     schedule:
       interval: weekly
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 36bd93d2..79e9b618 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -16,42 +16,42 @@ jobs:
       SETUPTOOLS_SCM_PRETEND_VERSION: ${{ github.event.inputs.version }}
 
     steps:
-    - uses: actions/checkout@v6
+      - uses: actions/checkout@v6
 
-    - name: Build and Check Package
-      uses: hynek/build-and-inspect-python-package@v2.14
+      - name: Build and Check Package
+        uses: hynek/build-and-inspect-python-package@v2.14
 
   deploy:
     needs: package
     runs-on: ubuntu-latest
     environment: deploy
     permissions:
-      id-token: write  # For PyPI trusted publishers.
-      contents: write  # For tag.
+      id-token: write # For PyPI trusted publishers.
+      contents: write # For tag.
 
     steps:
-    - uses: actions/checkout@v6
-
-    - name: Download Package
-      uses: actions/download-artifact@v7
-      with:
-        name: Packages
-        path: dist
-
-    - name: Publish package to PyPI
-      uses: pypa/gh-action-pypi-publish@v1.13.0
-      with:
-        attestations: true
-
-    - name: Push tag
-      run: |
-        git config user.name "pytest bot"
-        git config user.email "pytestbot@gmail.com"
-        git tag --annotate --message=v${{ github.event.inputs.version }} v${{ github.event.inputs.version }} ${{ github.sha }}
-        git push origin v${{ github.event.inputs.version }}
-
-    - name: GitHub Release
-      uses: softprops/action-gh-release@v2
-      with:
-        files: dist/*
-        tag_name: v${{ github.event.inputs.version }}
+      - uses: actions/checkout@v6
+
+      - name: Download Package
+        uses: actions/download-artifact@v7
+        with:
+          name: Packages
+          path: dist
+
+      - name: Publish package to PyPI
+        uses: pypa/gh-action-pypi-publish@v1.13.0
+        with:
+          attestations: true
+
+      - name: Push tag
+        run: |
+          git config user.name "pytest bot"
+          git config user.email "pytestbot@gmail.com"
+          git tag --annotate --message=v${{ github.event.inputs.version }} v${{ github.event.inputs.version }} ${{ github.sha }}
+          git push origin v${{ github.event.inputs.version }}
+
+      - name: GitHub Release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: dist/*
+          tag_name: v${{ github.event.inputs.version }}
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index afc3bef7..312e8e9d 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -20,9 +20,9 @@ jobs:
   package:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v6
-    - name: Build and Check Package
-      uses: hynek/build-and-inspect-python-package@v2.14
+      - uses: actions/checkout@v6
+      - name: Build and Check Package
+        uses: hynek/build-and-inspect-python-package@v2.14
 
   test:
 
@@ -69,28 +69,28 @@ jobs:
             python: "3.10"
 
     steps:
-    - uses: actions/checkout@v6
-      with:
-        # Needed to fetch tags, which are required by setuptools-scm.
-        fetch-depth: 0
+      - uses: actions/checkout@v6
+        with:
+          # Needed to fetch tags, which are required by setuptools-scm.
+          fetch-depth: 0
 
-    - name: Download Package
-      uses: actions/download-artifact@v7
-      with:
-        name: Packages
-        path: dist
+      - name: Download Package
+        uses: actions/download-artifact@v7
+        with:
+          name: Packages
+          path: dist
 
-    - name: Set up Python
-      uses: actions/setup-python@v6
-      with:
-        python-version: ${{ matrix.python }}
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: ${{ matrix.python }}
 
-    - name: Install tox
-      run: |
-        python -m pip install --upgrade pip
-        pip install tox
+      - name: Install tox
+        run: |
+          python -m pip install --upgrade pip
+          pip install tox
 
-    - name: Test
-      shell: bash
-      run: |
-        tox run -e ${{ matrix.tox_env }} --installpkg "$(find dist/*.whl)"
+      - name: Test
+        shell: bash
+        run: |
+          tox run -e ${{ matrix.tox_env }} --installpkg "$(find dist/*.whl)"
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index a05a730d..898244eb 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,31 +1,31 @@
 repos:
-- repo: https://github.com/astral-sh/ruff-pre-commit
-  rev: "v0.14.14"
-  hooks:
-    - id: ruff
-      args: ["--fix"]
-    - id: ruff-format
--   repo: https://github.com/asottile/blacken-docs
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.14.14
+    hooks:
+      - id: ruff
+        args: [--fix]
+      - id: ruff-format
+  - repo: https://github.com/asottile/blacken-docs
     rev: 1.20.0
     hooks:
-    -   id: blacken-docs
+      - id: blacken-docs
         additional_dependencies: [black==23.1.0]
--   repo: https://github.com/pre-commit/pre-commit-hooks
+  - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v6.0.0
     hooks:
-    -   id: check-yaml
--   repo: local
+      - id: check-yaml
+  - repo: local
     hooks:
-    -   id: rst
+      - id: rst
         name: rst
         entry: rst-lint
         files: ^(CHANGELOG.rst|HOWTORELEASE.rst|README.rst|changelog/.*)$
         language: python
         additional_dependencies: [pygments, restructuredtext_lint]
--   repo: https://github.com/pre-commit/mirrors-mypy
+  - repo: https://github.com/pre-commit/mirrors-mypy
     rev: v1.19.1
     hooks:
-    -   id: mypy
+      - id: mypy
         files: ^(src/|testing/)
         args: []
         additional_dependencies:
@@ -33,3 +33,12 @@ repos:
           - execnet>=2.1.0
           - types-psutil
           - setproctitle
+  - repo: https://github.com/google/yamlfmt
+    rev: v0.21.0
+    hooks:
+      - id: yamlfmt
+        name: YAML formatter
+        files: (^|/).*\.ya?ml$
+        args:
+          - "--conf"
+          - ".yamlfmt"
diff --git a/.yamlfmt b/.yamlfmt
new file mode 100644
index 00000000..f13843f4
--- /dev/null
+++ b/.yamlfmt
@@ -0,0 +1,10 @@
+# config for pre-commit https://github.com/google/yamlfmt
+
+formatter:
+  type: basic
+  line_ending: lf
+  indent: 2
+  include_document_start: false
+  retain_line_breaks: true
+  retain_empty_objects: false
+  disable_sort_keys: false