diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c2c14cf9..99fd7757 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -43,7 +43,7 @@ jobs:
         run: |
           # We run tests against "." and not the tests directory as we test the README
           # and documentation.
-          uv run --extra=dev pytest -s -vvv --cov-fail-under 100 --cov=src/ --cov=tests .
+          uv run --group=dev pytest -s -vvv --cov-fail-under 100 --cov=src/ --cov=tests .
         env:
           UV_PYTHON: ${{ matrix.python-version }}
 
diff --git a/.github/workflows/publish-site.yml b/.github/workflows/publish-site.yml
index a70f2f2c..b3cd50d0 100644
--- a/.github/workflows/publish-site.yml
+++ b/.github/workflows/publish-site.yml
@@ -31,7 +31,7 @@ jobs:
         uses: sphinx-notes/pages@v3
         with:
           documentation_path: docs/source
-          pyproject_extras: dev
+          pyproject_group: dev
           python_version: '3.14'
           sphinx_build_options: -W
           publish: ${{ github.ref_name == 'main' }}
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 484e6e0a..7b147b84 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -53,7 +53,7 @@ jobs:
       - name: Generate the GitHub release notes
         env:
           RELEASE: ${{ steps.calver.outputs.release }}
-        run: uv run --extra=release towncrier build --draft --version "$RELEASE" >
+        run: uv run --group=release towncrier build --draft --version "$RELEASE" >
           release-notes.md
 
       # Assemble the same fragments into CHANGELOG.rst under a new
@@ -61,7 +61,7 @@ jobs:
       - name: Update the changelog
         env:
           RELEASE: ${{ steps.calver.outputs.release }}
-        run: uv run --extra=release towncrier build --yes --version "$RELEASE"
+        run: uv run --group=release towncrier build --yes --version "$RELEASE"
 
       - uses: stefanzweifel/git-auto-commit-action@v7
         id: commit
@@ -95,7 +95,7 @@ jobs:
           git fetch --tags
           git checkout "$NEW_TAG"
           uv build --sdist --wheel --out-dir dist/
-          uv run --extra=release check-wheel-contents dist/*.whl
+          uv run --group=release check-wheel-contents dist/*.whl
 
       # We use PyPI trusted publishing rather than a PyPI API token.
       # See https://github.com/pypa/gh-action-pypi-publish/tree/release/v1/?tab=readme-ov-file#trusted-publishing.
diff --git a/docs/source/contributing.rst b/docs/source/contributing.rst
index ee4b19a7..16284a5d 100644
--- a/docs/source/contributing.rst
+++ b/docs/source/contributing.rst
@@ -12,7 +12,7 @@ Install Python dependencies in a virtual environment.
 
 .. code-block:: console
 
-   $ pip install --editable '.[dev]'
+   $ pip install --editable . --group dev
 
 Spell checking requires ``enchant``.
 This can be installed on macOS, for example, with `Homebrew`_:
@@ -64,7 +64,7 @@ Run the following commands to build and view documentation locally:
 
 .. code-block:: console
 
-   $ uv run --extra=dev sphinx-build -M html docs/source docs/build -W
+   $ uv run --group=dev sphinx-build -M html docs/source docs/build -W
    $ python -c 'import os, webbrowser; webbrowser.open("file://" + os.path.abspath("docs/build/html/index.html"))'
 
 Continuous integration
diff --git a/prek.toml b/prek.toml
index ca2c206b..41914521 100644
--- a/prek.toml
+++ b/prek.toml
@@ -104,7 +104,7 @@ hooks = [
   {
     id = "actionlint",
     name = "actionlint",
-    entry = "uv run --extra=dev actionlint",
+    entry = "uv run --group=dev actionlint",
     language = "python",
     pass_filenames = false,
     types_or = ["yaml"],
@@ -114,7 +114,7 @@ hooks = [
   {
     id = "pydocstringformatter",
     name = "pydocstringformatter",
-    entry = "uv run --extra=dev pydocstringformatter",
+    entry = "uv run --group=dev pydocstringformatter",
     language = "python",
     types_or = ["python"],
     additional_dependencies = ["uv==0.11.7"],
@@ -123,7 +123,7 @@ hooks = [
   {
     id = "shellcheck",
     name = "shellcheck",
-    entry = "uv run --extra=dev shellcheck --shell=bash",
+    entry = "uv run --group=dev shellcheck --shell=bash",
     language = "python",
     types_or = ["shell"],
     additional_dependencies = ["uv==0.11.7"],
@@ -132,7 +132,7 @@ hooks = [
   {
     id = "shellcheck-docs",
     name = "shellcheck-docs",
-    entry = 'uv run --extra=dev doccmd --no-write-to-file --example-workers 0 --language=shell --language=console --command="shellcheck --shell=bash"',
+    entry = 'uv run --group=dev doccmd --no-write-to-file --example-workers 0 --language=shell --language=console --command="shellcheck --shell=bash"',
     language = "python",
     types_or = [
       "markdown",
@@ -144,7 +144,7 @@ hooks = [
   {
     id = "shfmt",
     name = "shfmt",
-    entry = "uv run --extra=dev shfmt --write --space-redirects --indent=4",
+    entry = "uv run --group=dev shfmt --write --space-redirects --indent=4",
     language = "python",
     types_or = ["shell"],
     additional_dependencies = ["uv==0.11.7"],
@@ -153,7 +153,7 @@ hooks = [
   {
     id = "shfmt-docs",
     name = "shfmt-docs",
-    entry = 'uv run --extra=dev doccmd --language=shell --language=console --skip-marker=shfmt --no-pad-file --command="shfmt --write --space-redirects --indent=4"',
+    entry = 'uv run --group=dev doccmd --language=shell --language=console --skip-marker=shfmt --no-pad-file --command="shfmt --write --space-redirects --indent=4"',
     language = "python",
     types_or = [
       "markdown",
@@ -166,7 +166,7 @@ hooks = [
     id = "mypy",
     name = "mypy",
     stages = ["pre-push"],
-    entry = "uv run --extra=dev -m mypy --num-workers=4",
+    entry = "uv run --group=dev -m mypy --num-workers=4",
     language = "python",
     types_or = [
       "python",
@@ -179,7 +179,7 @@ hooks = [
     id = "mypy-docs",
     name = "mypy-docs",
     stages = ["pre-push"],
-    entry = 'uv run --extra=dev doccmd --no-write-to-file --language=python --command="mypy --num-workers=4"',
+    entry = 'uv run --group=dev doccmd --no-write-to-file --language=python --command="mypy --num-workers=4"',
     language = "python",
     types_or = [
       "markdown",
@@ -190,7 +190,7 @@ hooks = [
     id = "check-manifest",
     name = "check-manifest",
     stages = ["pre-push"],
-    entry = "uv run --extra=dev -m check_manifest",
+    entry = "uv run --group=dev -m check_manifest",
     language = "python",
     pass_filenames = false,
     additional_dependencies = ["uv==0.11.7"]
@@ -199,7 +199,7 @@ hooks = [
     id = "pyright",
     name = "pyright",
     stages = ["pre-push"],
-    entry = "uv run --extra=dev -m pyright .",
+    entry = "uv run --group=dev -m pyright .",
     language = "python",
     types_or = [
       "python",
@@ -212,7 +212,7 @@ hooks = [
     id = "pyright-docs",
     name = "pyright-docs",
     stages = ["pre-push"],
-    entry = 'uv run --extra=dev doccmd --no-write-to-file --example-workers 0 --language=python --command="pyright"',
+    entry = 'uv run --group=dev doccmd --no-write-to-file --example-workers 0 --language=python --command="pyright"',
     language = "python",
     types_or = [
       "markdown",
@@ -222,7 +222,7 @@ hooks = [
   {
     id = "vulture",
     name = "vulture",
-    entry = "uv run --extra=dev -m vulture .",
+    entry = "uv run --group=dev -m vulture .",
     language = "python",
     types_or = ["python"],
     pass_filenames = false,
@@ -232,7 +232,7 @@ hooks = [
   {
     id = "vulture-docs",
     name = "vulture docs",
-    entry = 'uv run --extra=dev doccmd --no-write-to-file --example-workers 0 --language=python --command="vulture"',
+    entry = 'uv run --group=dev doccmd --no-write-to-file --example-workers 0 --language=python --command="vulture"',
     language = "python",
     types_or = ["python"],
     pass_filenames = false,
@@ -242,7 +242,7 @@ hooks = [
   {
     id = "pyroma",
     name = "pyroma",
-    entry = "uv run --extra=dev -m pyroma --min 10 .",
+    entry = "uv run --group=dev -m pyroma --min 10 .",
     language = "python",
     pass_filenames = false,
     types_or = ["toml"],
@@ -252,7 +252,7 @@ hooks = [
   {
     id = "deptry",
     name = "deptry",
-    entry = "uv run --extra=dev -m deptry src/",
+    entry = "uv run --group=dev -m deptry src/",
     language = "python",
     pass_filenames = false,
     additional_dependencies = ["uv==0.11.7"],
@@ -261,7 +261,7 @@ hooks = [
   {
     id = "pylint",
     name = "pylint",
-    entry = "uv run --extra=dev -m pylint *.py src/ tests/ docs/",
+    entry = "uv run --group=dev -m pylint *.py src/ tests/ docs/",
     language = "python",
     stages = ["manual"],
     pass_filenames = false,
@@ -270,7 +270,7 @@ hooks = [
   {
     id = "pylint-docs",
     name = "pylint-docs",
-    entry = 'uv run --extra=dev doccmd --no-write-to-file --example-workers 0 --language=python --command="pylint"',
+    entry = 'uv run --group=dev doccmd --no-write-to-file --example-workers 0 --language=python --command="pylint"',
     language = "python",
     stages = ["manual"],
     types_or = [
@@ -281,7 +281,7 @@ hooks = [
   {
     id = "ruff-check-fix",
     name = "Ruff check fix",
-    entry = "uv run --extra=dev -m ruff check --fix",
+    entry = "uv run --group=dev -m ruff check --fix",
     language = "python",
     types_or = ["python"],
     additional_dependencies = ["uv==0.11.7"],
@@ -290,7 +290,7 @@ hooks = [
   {
     id = "ruff-check-fix-docs",
     name = "Ruff check fix docs",
-    entry = 'uv run --extra=dev doccmd --language=python --command="ruff check --fix"',
+    entry = 'uv run --group=dev doccmd --language=python --command="ruff check --fix"',
     language = "python",
     types_or = [
       "markdown",
@@ -302,7 +302,7 @@ hooks = [
   {
     id = "ruff-format-fix",
     name = "Ruff format",
-    entry = "uv run --extra=dev -m ruff format",
+    entry = "uv run --group=dev -m ruff format",
     language = "python",
     types_or = ["python"],
     additional_dependencies = ["uv==0.11.7"],
@@ -311,7 +311,7 @@ hooks = [
   {
     id = "ruff-format-fix-docs",
     name = "Ruff format docs",
-    entry = 'uv run --extra=dev doccmd --language=python --no-pad-file --command="ruff format"',
+    entry = 'uv run --group=dev doccmd --language=python --no-pad-file --command="ruff format"',
     language = "python",
     types_or = [
       "markdown",
@@ -323,7 +323,7 @@ hooks = [
   {
     id = "strict-kwargs-fix",
     name = "strict-kwargs",
-    entry = "uv run --extra=dev strict-kwargs check --fix",
+    entry = "uv run --group=dev strict-kwargs check --fix",
     language = "python",
     types_or = ["python"],
     additional_dependencies = ["uv==0.11.7"],
@@ -333,7 +333,7 @@ hooks = [
   {
     id = "no-defaults",
     name = "no-defaults",
-    entry = "uv run --extra=dev no-defaults",
+    entry = "uv run --group=dev no-defaults",
     language = "python",
     types_or = ["python"],
     additional_dependencies = ["uv==0.11.7"],
@@ -343,7 +343,7 @@ hooks = [
   {
     id = "vale-sync",
     name = "vale sync",
-    entry = "uv run --extra=dev vale sync",
+    entry = "uv run --group=dev vale sync",
     language = "python",
     pass_filenames = false,
     files = '(\.(rst|md)$|^\.vale\.ini$)',
@@ -353,7 +353,7 @@ hooks = [
   {
     id = "vale",
     name = "vale",
-    entry = "uv run --extra=dev vale",
+    entry = "uv run --group=dev vale",
     language = "python",
     types_or = [
       "rst",
@@ -366,7 +366,7 @@ hooks = [
   {
     id = "doc8",
     name = "doc8",
-    entry = "uv run --extra=dev -m doc8",
+    entry = "uv run --group=dev -m doc8",
     language = "python",
     types_or = ["rst"],
     additional_dependencies = ["uv==0.11.7"],
@@ -375,7 +375,7 @@ hooks = [
   {
     id = "interrogate",
     name = "interrogate",
-    entry = "uv run --extra=dev -m interrogate",
+    entry = "uv run --group=dev -m interrogate",
     language = "python",
     types_or = ["python"],
     additional_dependencies = ["uv==0.11.7"],
@@ -384,7 +384,7 @@ hooks = [
   {
     id = "interrogate-docs",
     name = "interrogate docs",
-    entry = 'uv run --extra=dev doccmd --no-write-to-file --example-workers 0 --language=python --command="interrogate"',
+    entry = 'uv run --group=dev doccmd --no-write-to-file --example-workers 0 --language=python --command="interrogate"',
     language = "python",
     types_or = [
       "markdown",
@@ -396,7 +396,7 @@ hooks = [
   {
     id = "pyproject-fmt-fix",
     name = "pyproject-fmt",
-    entry = "uv run --extra=dev pyproject-fmt",
+    entry = "uv run --group=dev pyproject-fmt",
     language = "python",
     types_or = ["toml"],
     files = "pyproject.toml",
@@ -405,7 +405,7 @@ hooks = [
   {
     id = "linkcheck",
     name = "linkcheck",
-    entry = "uv run --extra=dev sphinx-build -M linkcheck docs/source docs/build -W",
+    entry = "uv run --group=dev sphinx-build -M linkcheck docs/source docs/build -W",
     language = "python",
     types_or = ["rst"],
     stages = ["manual"],
@@ -415,7 +415,7 @@ hooks = [
   {
     id = "spelling",
     name = "spelling",
-    entry = "uv run --extra=dev sphinx-build -M spelling docs/source docs/build -W",
+    entry = "uv run --group=dev sphinx-build -M spelling docs/source docs/build -W",
     language = "python",
     types_or = ["rst"],
     stages = ["manual"],
@@ -425,7 +425,7 @@ hooks = [
   {
     id = "docs",
     name = "Build Documentation",
-    entry = "uv run --extra=dev sphinx-build -M html docs/source docs/build -W",
+    entry = "uv run --group=dev sphinx-build -M html docs/source docs/build -W",
     language = "python",
     stages = ["manual"],
     pass_filenames = false,
@@ -435,7 +435,7 @@ hooks = [
     id = "pyright-verifytypes",
     name = "pyright-verifytypes",
     stages = ["pre-push"],
-    entry = "uv run --extra=dev -m pyright --verifytypes vws_auth_tools",
+    entry = "uv run --group=dev -m pyright --verifytypes vws_auth_tools",
     language = "python",
     pass_filenames = false,
     types_or = ["python"]
@@ -444,7 +444,7 @@ hooks = [
     id = "ty",
     name = "ty",
     stages = ["pre-push"],
-    entry = "uv run --extra=dev ty check",
+    entry = "uv run --group=dev ty check",
     language = "python",
     types_or = [
       "python",
@@ -457,7 +457,7 @@ hooks = [
     id = "ty-docs",
     name = "ty-docs",
     stages = ["pre-push"],
-    entry = 'uv run --extra=dev doccmd --no-write-to-file --example-workers 0 --language=python --command="ty check"',
+    entry = 'uv run --group=dev doccmd --no-write-to-file --example-workers 0 --language=python --command="ty check"',
     language = "python",
     types_or = [
       "markdown",
@@ -469,7 +469,7 @@ hooks = [
     id = "pyrefly",
     name = "pyrefly",
     stages = ["pre-push"],
-    entry = "uv run --extra=dev pyrefly check",
+    entry = "uv run --group=dev pyrefly check",
     language = "python",
     types_or = [
       "python",
@@ -482,7 +482,7 @@ hooks = [
     id = "pyrefly-docs",
     name = "pyrefly-docs",
     stages = ["pre-push"],
-    entry = 'uv run --extra=dev doccmd --no-write-to-file --example-workers 0 --language=python --command="pyrefly check"',
+    entry = 'uv run --group=dev doccmd --no-write-to-file --example-workers 0 --language=python --command="pyrefly check"',
     language = "python",
     types_or = [
       "markdown",
@@ -493,7 +493,7 @@ hooks = [
   {
     id = "yamlfix",
     name = "yamlfix",
-    entry = "uv run --extra=dev yamlfix",
+    entry = "uv run --group=dev yamlfix",
     language = "python",
     types_or = ["yaml"],
     additional_dependencies = ["uv==0.11.7"],
@@ -502,7 +502,7 @@ hooks = [
   {
     id = "zizmor",
     name = "zizmor",
-    entry = "uv run --extra=dev zizmor --strict-collection .github",
+    entry = "uv run --group=dev zizmor --strict-collection .github",
     language = "python",
     pass_filenames = false,
     types_or = ["yaml"],
@@ -512,7 +512,7 @@ hooks = [
   {
     id = "sphinx-lint",
     name = "sphinx-lint",
-    entry = "uv run --extra=dev sphinx-lint --enable=all --disable=line-too-long",
+    entry = "uv run --group=dev sphinx-lint --enable=all --disable=line-too-long",
     language = "python",
     types_or = ["rst"],
     additional_dependencies = ["uv==0.11.7"],
diff --git a/pyproject.toml b/pyproject.toml
index 488c8e67..d94020de 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -32,7 +32,11 @@ dynamic = [
 dependencies = [
     "beartype>=0.22.9",
 ]
-optional-dependencies.dev = [
+urls.Documentation = "https://vws-python.github.io/vws-auth-tools/"
+urls.Source = "https://github.com/VWS-Python/vws-auth-tools"
+
+[dependency-groups]
+dev = [
     "actionlint-py==1.7.12.24",
     "check-manifest==0.51",
     "deptry==0.25.1",
@@ -83,12 +87,7 @@ optional-dependencies.dev = [
     "yamlfix==1.19.1",
     "zizmor==1.30.0",
 ]
-optional-dependencies.release = [ "check-wheel-contents==0.6.3", "towncrier==26.9.0" ]
-urls.Documentation = "https://vws-python.github.io/vws-auth-tools/"
-urls.Source = "https://github.com/VWS-Python/vws-auth-tools"
-
-[dependency-groups]
-dev = []
+release = [ "check-wheel-contents==0.6.3", "towncrier==26.9.0" ]
 
 [tool.setuptools]
 packages.find.where = [
@@ -304,12 +303,6 @@ ignore = [
     "zizmor.yml",
 ]
 
-[tool.deptry]
-optional_dependencies_dev_groups = [
-    "dev",
-    "release",
-]
-
 [tool.vulture]
 # Duplicate some of .gitignore
 exclude = [ ".venv" ]