diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index f3da861f..d46fb755 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -8,23 +8,30 @@ on:
 
 jobs:
   main-windows:
-    uses: asottile/workflows/.github/workflows/tox.yml@v1.5.0
+    uses: asottile/workflows/.github/workflows/tox.yml@v1.8.1
     with:
-      env: '["py38"]'
+      env: '["py39"]'
       os: windows-latest
       arch: '["x64", "x86"]'
       wheel-tags: true
       submodules: true
   main-macos:
-    uses: asottile/workflows/.github/workflows/tox.yml@v1.5.0
+    uses: asottile/workflows/.github/workflows/tox.yml@v1.8.1
     with:
-      env: '["py38"]'
+      env: '["py39"]'
       os: macos-latest
       wheel-tags: true
       submodules: true
+  main-macos-intel:
+    uses: asottile/workflows/.github/workflows/tox.yml@v1.8.1
+    with:
+      env: '["py39"]'
+      os: macos-13
+      wheel-tags: true
+      submodules: true
   main-linux:
-    uses: asottile/workflows/.github/workflows/tox.yml@v1.5.0
+    uses: asottile/workflows/.github/workflows/tox.yml@v1.8.1
     with:
-      env: '["pypy3", "py38", "py39", "py310", "py311"]'
+      env: '["py39", "py310", "py311"]'
       os: ubuntu-latest
       submodules: true
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 791adf5f..1874d259 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,6 +1,6 @@
 repos:
 -   repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.5.0
+    rev: v5.0.0
     hooks:
     -   id: trailing-whitespace
     -   id: end-of-file-fixer
@@ -9,26 +9,30 @@ repos:
     -   id: double-quote-string-fixer
     -   id: name-tests-test
     -   id: requirements-txt-fixer
+-   repo: https://github.com/asottile/setup-cfg-fmt
+    rev: v2.8.0
+    hooks:
+    -   id: setup-cfg-fmt
 -   repo: https://github.com/asottile/reorder-python-imports
-    rev: v3.12.0
+    rev: v3.15.0
     hooks:
     -   id: reorder-python-imports
-        args: [--py38-plus]
+        args: [--py39-plus]
 -   repo: https://github.com/asottile/add-trailing-comma
-    rev: v3.1.0
+    rev: v3.2.0
     hooks:
     -   id: add-trailing-comma
 -   repo: https://github.com/asottile/pyupgrade
-    rev: v3.15.0
+    rev: v3.20.0
     hooks:
     -   id: pyupgrade
-        args: [--py38-plus]
+        args: [--py39-plus]
 -   repo: https://github.com/hhatto/autopep8
-    rev: v2.0.4
+    rev: v2.3.2
     hooks:
     -   id: autopep8
 -   repo: https://github.com/PyCQA/flake8
-    rev: 6.1.0
+    rev: 7.2.0
     hooks:
     -   id: flake8
         exclude: ^docs/conf.py
diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
index 101beec7..37c4e077 100644
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -23,10 +23,10 @@ Tests
 - All code patches should contain one or more unit tests or regression tests.
 - All code patches have to successfully run tests on every Python version
   we aim to support.  tox_ would help.
-- All commits will be tested by `Azure Pipelines`_ (Linux and Windows).
+- All commits will be tested by `GitHub Actions`_ (Linux and Windows).
 
 .. _tox:  https://tox.readthedocs.io/
-.. _`Azure Pipelines`: https://dev.azure.com/asottile/asottile/_build/latest?definitionId=22&branchName=main
+.. _`GitHub Actions`: https://github.com/sass/libsass-python/actions
 
 
 Maintainer's guide
@@ -50,10 +50,9 @@ Here's a brief check list for releasing a new version:
 - Make a source distribution and upload it to PyPI
   (``python3 setup.py sdist upload``).
   If it's successful the new version must appear on PyPI_.
-- `Azure Pipelines`_ automatically makes binary wheels for Windows, but each
+- `GitHub Actions`_ automatically makes binary wheels for Windows, but each
   CI build takes a while.  These wheels are not automatically uploaded,
-  but there's ``./bin/download-windows-wheels`` script that downloads built
-  wheels.  Then upload them with ``twine``.
+  you can retreive them from the build's artifacts.
 - Run ``./bin/build-manylinux-wheels`` to build linux wheels and upload them to
   PyPI (takes ~5 minutes).
 - The `docs website`__ also has to be updated.
diff --git a/README.rst b/README.rst
index de214895..593c78f1 100644
--- a/README.rst
+++ b/README.rst
@@ -20,8 +20,6 @@ distribution/deployment.  That means you can add just ``libsass`` into
 your ``setup.py``'s ``install_requires`` list or ``requirements.txt`` file.
 No need for Ruby nor Node.js.
 
-It currently supports CPython 3.7+, and PyPy 3!
-
 .. _Sass: https://sass-lang.com/
 .. _LibSass: https://github.com/sass/libsass
 
diff --git a/bin/build-manylinux-wheels b/bin/build-manylinux-wheels
index 65e05355..233c5afc 100755
--- a/bin/build-manylinux-wheels
+++ b/bin/build-manylinux-wheels
@@ -22,7 +22,7 @@ def check_call(*cmd):
 def main():
     os.makedirs('dist', exist_ok=True)
     with tempfile.TemporaryDirectory() as work:
-        pip = '/opt/python/cp37-cp37m/bin/pip'
+        pip = '/opt/python/cp39-cp39/bin/pip'
         check_call(
             'docker', 'run', '-ti',
             # Use this so the files are not owned by root
diff --git a/bin/download-windows-wheels b/bin/download-windows-wheels
deleted file mode 100755
index dee25a26..00000000
--- a/bin/download-windows-wheels
+++ /dev/null
@@ -1,59 +0,0 @@
-#!/usr/bin/env python3
-import argparse
-import io
-import json
-import os.path
-import re
-import urllib.request
-import zipfile
-
-DEFINITION_RE = re.compile(
-    r'https://dev.azure.com/(?P<org>[^/]+)/(?P<project>[^/]+)'
-    r'/_build/latest\?definitionId=(?P<definition>\d+)',
-)
-BUILDS = 'https://dev.azure.com/{org}/{project}/_apis/build/builds?api-version=5.0&definitions={definition}&$top=5'  # noqa: E501
-ARTIFACTS = 'https://dev.azure.com/{org}/{project}/_apis/build/builds/{build}/artifacts?api-version=5.0'  # noqa: E501
-
-
-def main() -> int:
-    parser = argparse.ArgumentParser()
-    parser.add_argument('tag')
-    parser.add_argument('--dest', default='dist')
-    args = parser.parse_args()
-
-    with open('README.rst') as f:
-        match = DEFINITION_RE.search(f.read())
-        assert match
-
-    builds_resp = urllib.request.urlopen(BUILDS.format(**match.groupdict()))
-    builds_json = json.load(builds_resp)
-
-    build_id = next(
-        iter([
-            build['id'] for build in builds_json['value']
-            if build['status'] == 'completed'
-            if build['result'] == 'succeeded'
-            if build['sourceBranch'] == f'refs/tags/{args.tag}'
-        ]),
-    )
-
-    artifacts_url = ARTIFACTS.format(build=build_id, **match.groupdict())
-    artifacts_resp = urllib.request.urlopen(artifacts_url)
-    artifacts_json = json.load(artifacts_resp)
-
-    os.makedirs(args.dest, exist_ok=True)
-    for artifact in artifacts_json['value']:
-        if artifact['name'].startswith('wheel_'):
-            print(f'artifact: {artifact["name"]}')
-            resp = urllib.request.urlopen(artifact['resource']['downloadUrl'])
-            bio = io.BytesIO(resp.read())
-            with zipfile.ZipFile(bio) as zipf:
-                for info in zipf.infolist():
-                    if info.filename.endswith('.whl'):
-                        info.filename = os.path.basename(info.filename)
-                        zipf.extract(info, path=args.dest)
-    return 0
-
-
-if __name__ == '__main__':
-    raise SystemExit(main())
diff --git a/docs/changes.rst b/docs/changes.rst
index 0cc472e9..cf4b4b8e 100644
--- a/docs/changes.rst
+++ b/docs/changes.rst
@@ -1,6 +1,16 @@
 Changelog
 =========
 
+Version 0.23.0
+--------------
+
+Released on January 6, 2024.
+
+- Follow up the libsass upstream: 3.6.6 --- See the release notes of LibSass
+  3.6.6__. [:issue:`452` by Anthony Sottile]
+
+__ https://github.com/sass/libsass/releases/tag/3.6.6
+
 Version 0.22.0
 --------------
 
diff --git a/docs/conf.py b/docs/conf.py
index ca7e3906..46964c23 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -267,11 +267,11 @@
 
 
 extlinks = {
-    'issue': ('https://github.com/sass/libsass-python/issues/%s', '#'),
+    'issue': ('https://github.com/sass/libsass-python/issues/%s', '#%s'),
     'branch': (
         'https://github.com/sass/libsass-python/compare/main...%s',
-        '',
+        '%s',
     ),
-    'commit': ('https://github.com/sass/libsass-python/commit/%s', ''),
-    'upcommit': ('https://github.com/sass/libsass/commit/%s', ''),
+    'commit': ('https://github.com/sass/libsass-python/commit/%s', '%s'),
+    'upcommit': ('https://github.com/sass/libsass/commit/%s', '%s'),
 }
diff --git a/docs/index.rst b/docs/index.rst
index dafa5845..be2ee3f0 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -8,8 +8,6 @@ distribution/deployment.  That means you can add just ``libsass`` into
 your :file:`setup.py`'s ``install_requires`` list or :file:`requirements.txt`
 file.
 
-It currently supports CPython 3.7+ and PyPy 3!
-
 .. _Sass: https://sass-lang.com/
 .. _LibSass: https://github.com/sass/libsass
 
diff --git a/libsass b/libsass
index f6afdbb9..7037f03f 160000
--- a/libsass
+++ b/libsass
@@ -1 +1 @@
-Subproject commit f6afdbb9288d20d1257122e71d88e53348a53af3
+Subproject commit 7037f03fabeb2b18b5efa84403f5a6d7a990f460
diff --git a/sass.py b/sass.py
index 4e660883..055221fb 100644
--- a/sass.py
+++ b/sass.py
@@ -24,7 +24,7 @@
     'SassError', 'SassFunction', 'SassList', 'SassMap', 'SassNumber',
     'SassWarning', 'and_join', 'compile', 'libsass_version',
 )
-__version__ = '0.22.0'
+__version__ = '0.23.0'
 libsass_version = _sass.libsass_version
 
 
diff --git a/setup.cfg b/setup.cfg
index 8d0ca2bb..406413ca 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,9 +1,50 @@
+[metadata]
+name = libsass
+version = attr: sass.__version__
+description = Sass for Python: A straightforward binding of libsass for Python.
+long_description = file: README.rst
+long_description_content_type = text/x-rst
+url = https://sass.github.io/libsass-python/
+author = Hong Minhee
+author_email = minhee@dahlia.kr
+license = MIT
+license_files = LICENSE
+classifiers =
+    Development Status :: 5 - Production/Stable
+    Environment :: Web Environment
+    Intended Audience :: Developers
+    Operating System :: OS Independent
+    Programming Language :: C
+    Programming Language :: C++
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3 :: Only
+    Programming Language :: Python :: Implementation :: CPython
+    Programming Language :: Python :: Implementation :: PyPy
+    Programming Language :: Python :: Implementation :: Stackless
+    Topic :: Internet :: WWW/HTTP
+    Topic :: Internet :: WWW/HTTP :: Dynamic Content
+    Topic :: Software Development :: Code Generators
+    Topic :: Software Development :: Compilers
+
+[options]
+packages = sassutils
+py_modules =
+    pysassc
+    sass
+    sasstests
+python_requires = >=3.9
+
+[options.entry_points]
+console_scripts =
+    pysassc = pysassc:main
+distutils.commands =
+    build_sass = sassutils.distutils:build_sass
+distutils.setup_keywords =
+    sass_manifests = sassutils.distutils:validate_manifests
+
 [aliases]
 upload_doc = build_sphinx upload_doc
 release = sdist upload build_sphinx upload_doc
 
 [flake8]
 exclude = .tox,build,dist,docs,ez_setup.py
-
-[metadata]
-license_file = LICENSE
diff --git a/setup.py b/setup.py
index fe9743e8..d877c2af 100644
--- a/setup.py
+++ b/setup.py
@@ -1,4 +1,3 @@
-import ast
 import atexit
 import os.path
 import platform
@@ -97,26 +96,7 @@ def customize_compiler(compiler):
                 elif filename.endswith('.h'):
                     headers.append(filename)
 
-    if sys.platform == 'win32':
-        from distutils.msvc9compiler import get_build_version
-        vscomntools_env = 'VS{}{}COMNTOOLS'.format(
-            int(get_build_version()),
-            int(get_build_version() * 10) % 10,
-        )
-        try:
-            os.environ[vscomntools_env] = os.environ['VS140COMNTOOLS']
-        except KeyError:
-            distutils.log.warn(
-                'You probably need Visual Studio 2015 (14.0) '
-                'or higher',
-            )
-        from distutils import msvccompiler, msvc9compiler
-        if msvccompiler.get_build_version() < 14.0:
-            msvccompiler.get_build_version = lambda: 14.0
-        if get_build_version() < 14.0:
-            msvc9compiler.get_build_version = lambda: 14.0
-            msvc9compiler.VERSION = 14.0
-    elif platform.system() in {'Darwin', 'FreeBSD', 'OpenBSD'}:
+    if platform.system() in {'Darwin', 'FreeBSD', 'OpenBSD'}:
         # Dirty workaround to avoid link error...
         # Python distutils doesn't provide any way
         # to configure different flags for each cc and c++.
@@ -169,24 +149,6 @@ def restore_cencode():
 )
 
 
-def version(sass_filename='sass.py'):
-    with open(sass_filename) as f:
-        tree = ast.parse(f.read(), sass_filename)
-    for node in tree.body:
-        if isinstance(node, ast.Assign) and len(node.targets) == 1:
-            target, = node.targets
-            if isinstance(target, ast.Name) and target.id == '__version__':
-                return node.value.s
-
-
-def readme():
-    try:
-        with open(os.path.join(os.path.dirname(__file__), 'README.rst')) as f:
-            return f.read()
-    except OSError:
-        pass
-
-
 class upload_doc(distutils.cmd.Command):
     """Uploads the documentation to GitHub pages."""
 
@@ -237,53 +199,6 @@ def finalize_options(self):
 
 
 setup(
-    name='libsass',
-    description='Sass for Python: '
-                'A straightforward binding of libsass for Python.',
-    long_description=readme(),
-    version=version(),
     ext_modules=[sass_extension],
-    packages=['sassutils'],
-    py_modules=['pysassc', 'sass', 'sasstests'],
-    package_data={
-        '': [
-            'README.rst',
-            'test/*.sass',
-        ],
-    },
-    license='MIT License',
-    author='Hong Minhee',
-    author_email='minhee' '@' 'dahlia.kr',
-    url='https://sass.github.io/libsass-python/',
-    download_url='https://github.com/sass/libsass-python/releases',
-    entry_points={
-        'distutils.commands': [
-            'build_sass = sassutils.distutils:build_sass',
-        ],
-        'distutils.setup_keywords': [
-            'sass_manifests = sassutils.distutils:validate_manifests',
-        ],
-        'console_scripts': [
-            ['pysassc = pysassc:main'],
-        ],
-    },
-    classifiers=[
-        'Development Status :: 5 - Production/Stable',
-        'Environment :: Web Environment',
-        'Intended Audience :: Developers',
-        'License :: OSI Approved :: MIT License',
-        'Operating System :: OS Independent',
-        'Programming Language :: C',
-        'Programming Language :: C++',
-        'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: Implementation :: CPython',
-        'Programming Language :: Python :: Implementation :: PyPy',
-        'Programming Language :: Python :: Implementation :: Stackless',
-        'Topic :: Internet :: WWW/HTTP',
-        'Topic :: Internet :: WWW/HTTP :: Dynamic Content',
-        'Topic :: Software Development :: Code Generators',
-        'Topic :: Software Development :: Compilers',
-    ],
-    python_requires='>=3.8',
     cmdclass=cmdclass,
 )