diff --git a/setup.cfg b/.flake8
similarity index 70%
rename from setup.cfg
rename to .flake8
index dbdc61b9..b7510db2 100644
--- a/setup.cfg
+++ b/.flake8
@@ -1,12 +1,6 @@
-[metadata]
-license_file = LICENSE
-
 [flake8]
 max-line-length = 100
 exclude = compoundsuper.py,indexsuper.py
 extend-ignore = E203, E231
 per-file-ignores =
     breathe/parser/index.py:E305
-
-[bdist_wheel]
-universal = 0
diff --git a/.github/FUNDING.yml b/.github/FUNDING.yml
index 0709cc05..c287bfa6 100644
--- a/.github/FUNDING.yml
+++ b/.github/FUNDING.yml
@@ -1,6 +1,6 @@
 # These are supported funding model platforms
 
-github: # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
+github: breathe-doc
 patreon: # Replace with a single Patreon username
 open_collective: breathe
 ko_fi: # Replace with a single Ko-fi username
diff --git a/.github/workflows/documentation.yml b/.github/workflows/documentation.yml
index f69712c0..624f3073 100644
--- a/.github/workflows/documentation.yml
+++ b/.github/workflows/documentation.yml
@@ -7,19 +7,15 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/cache@v3
-        with:
-          path: ~/.cache/pip
-          key: ${{ runner.os }}-pip-${{ hashFiles('requirements/*.txt') }}
-          restore-keys: |
-            ${{ runner.os }}-pip-
 
       - name: set up python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
+        with:
+          cache: 'pip'
 
       - name: install dependencies
         run: |
-          pip install -r requirements/development.txt
+          pip install ".[docs]"
           sudo apt-get -y update
           sudo apt-get -y install graphviz libclang1-11 libclang-cpp11
 
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index df95dfb2..9b054158 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -7,18 +7,15 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/cache@v3
-        with:
-          path: ~/.cache/pip
-          key: ${{ runner.os }}-pip-${{ hashFiles('requirements/*.txt') }}
-          restore-keys: |
-            ${{ runner.os }}-pip-
+
       - name: set up python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
+        with:
+          cache: 'pip'
 
       - name: install dependencies
         run: |
-          pip install -r requirements/development.txt
+          pip install ".[lint]"
 
       - name: lint the source code
         run: make flake8
@@ -28,6 +25,3 @@ jobs:
 
       - name: type check the source code
         run: make type-check
-
-      - name: check version numbers are in sync
-        run: make version-check
diff --git a/.github/workflows/unit_tests.yml b/.github/workflows/unit_tests.yml
index 4cb17e6a..0c95b400 100644
--- a/.github/workflows/unit_tests.yml
+++ b/.github/workflows/unit_tests.yml
@@ -7,46 +7,31 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.7', '3.8', '3.9', '3.10']
+        python-version:
+          - '3.8'
+          - '3.9'
+          - '3.10'
+          - '3.11'
+          - '3.12'
         sphinx-version:
-          - '4.0.3'
-          - '4.1.2'
-          - '4.2.0'
-          - '4.3.2'
-          - '4.5.0'
           - '5.0.2'
           - '5.1.1'
+          - '5.2.3'
           - '5.3.0'
           - '6.1.3'
           - git+https://github.com/sphinx-doc/sphinx.git@master
-        exclude:
-          # avoid bug in following configurations
-          # sphinx/util/typing.py:37: in <module>
-          #     from types import Union as types_Union
-          # ImportError: cannot import name 'Union' from 'types'
-          - python-version: '3.10'
-            sphinx-version: '4.0.3'
-          - python-version: '3.10'
-            sphinx-version: '4.1.2'
-
-          # Sphinx has removed support for Python 3.7, Breathe will follow.
-          - python-version: '3.7'
-            sphinx-version: git+https://github.com/sphinx-doc/sphinx.git@master
-          - python-version: '3.7'
-            sphinx-version: '6.1.3'
 
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/cache@v3
-        with:
-          path: ~/.cache/pip
-          key: ${{ runner.os }}-pip-${{ hashFiles('requirements/*.txt') }}
-          restore-keys: |
-            ${{ runner.os }}-pip-
       - name: set up python ${{ matrix.python-version }}
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
+          cache: 'pip'
+
+      - name: install dependencies
+        run: |
+          pip install ".[test]"
 
       - name: install sphinx from PyPI or from git
         run: |
@@ -56,9 +41,5 @@ jobs:
               pip install -Iv Sphinx==${{ matrix.sphinx-version }}
           fi
 
-      - name: install dependencies
-        run: |
-          pip install -r requirements/development.txt
-
       - name: run the unit tests
         run: make dev-test
diff --git a/Makefile b/Makefile
index 8acedb7d..6e5957e8 100644
--- a/Makefile
+++ b/Makefile
@@ -45,7 +45,3 @@ black:
 .PHONY: type-check
 type-check:
 	mypy --warn-redundant-casts --warn-unused-ignores breathe tests
-
-.PHONY: version-check
-version-check:
-	 PYTHONPATH=../:$(PYTHONPATH) python3 scripts/version-check.py
diff --git a/README.rst b/README.rst
index bfc11d78..cbf01022 100644
--- a/README.rst
+++ b/README.rst
@@ -98,7 +98,7 @@ branch.
 Requirements
 ------------
 
-Breathe requires Python 3.6+, Sphinx 4.0+ and Doxygen 1.8+.
+Breathe requires Python 3.8+, Sphinx 5.0+ and Doxygen 1.8+.
 
 Mailing List Archives
 ---------------------
diff --git a/breathe-apidoc.py b/breathe-apidoc.py
index a3437812..8aa276e5 100755
--- a/breathe-apidoc.py
+++ b/breathe-apidoc.py
@@ -1,5 +1,4 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*-
 
 import sys
 
diff --git a/breathe/__init__.py b/breathe/__init__.py
index b0282794..4864133d 100644
--- a/breathe/__init__.py
+++ b/breathe/__init__.py
@@ -4,7 +4,6 @@
 
 from sphinx.application import Sphinx
 
-# Keep in sync with setup.py __version__
 __version__ = "4.35.0"
 
 
diff --git a/breathe/apidoc.py b/breathe/apidoc.py
index e7ff33eb..19896680 100644
--- a/breathe/apidoc.py
+++ b/breathe/apidoc.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 """
     breathe.apidoc
     ~~~~~~~~~~~~~~
@@ -14,7 +13,6 @@
     :copyright: Originally by Sphinx Team, C++ modifications by Tatsuyuki Ishi
     :license: BSD, see LICENSE for details.
 """
-from __future__ import print_function
 
 import os
 import sys
@@ -24,14 +22,6 @@
 
 from breathe import __version__
 
-# Account for FileNotFoundError in Python 2
-# IOError is broader but will hopefully suffice
-try:
-    FileNotFoundError
-except NameError:
-    FileNotFoundError = IOError
-
-
 # Reference: Doxygen XSD schema file, CompoundKind only
 # Only what breathe supports are included
 # Translates identifier to English
@@ -71,7 +61,7 @@ def write_file(name, text, args):
                 if exc.errno != errno.EEXIST:
                     raise
         try:
-            with open(fname, "r") as target:
+            with open(fname) as target:
                 orig = target.read()
                 if orig == text:
                     print_info("File %s up to date, skipping." % fname, args)
@@ -141,7 +131,7 @@ def recurse_tree(args):
 
 class TypeAction(argparse.Action):
     def __init__(self, option_strings, dest, **kwargs):
-        super(TypeAction, self).__init__(option_strings, dest, **kwargs)
+        super().__init__(option_strings, dest, **kwargs)
         self.default = TYPEDICT.keys()
         self.metavar = ",".join(TYPEDICT.keys())
 
diff --git a/breathe/parser/compound.py b/breathe/parser/compound.py
index da6ee69b..cf858d7d 100644
--- a/breathe/parser/compound.py
+++ b/breathe/parser/compound.py
@@ -927,7 +927,7 @@ def __init__(self, char=None, valueOf_=''):
 # end class docCharTypeSub
 
 
-class verbatimTypeSub(object):
+class verbatimTypeSub:
     """
     New node type. Structure is largely pillaged from other nodes in order to
     match the set.
@@ -1200,7 +1200,7 @@ def parse(inFilename):
 
     try:
         doc = minidom.parse(inFilename)
-    except IOError as e:
+    except OSError as e:
         raise FileIOError(e)
     except ExpatError as e:
         raise ParseError(e)
diff --git a/breathe/parser/compoundsuper.py b/breathe/parser/compoundsuper.py
index 79050edd..3c01da9c 100644
--- a/breathe/parser/compoundsuper.py
+++ b/breathe/parser/compoundsuper.py
@@ -134,7 +134,7 @@ def getName(self):
         return self.name
 
 
-class _MemberSpec(object):
+class _MemberSpec:
     def __init__(self, name='', data_type='', container=0):
         self.name = name
         self.data_type = data_type
@@ -2632,7 +2632,7 @@ def buildChildren(self, child_, nodeName_):
                 value_.append(text_.nodeValue)
             # We make this unicode so that our unicode renderer catch-all picks it up
             # otherwise it would go through as 'str' and we'd have to pick it up too
-            valuestr_ = u' '
+            valuestr_ = ' '
             obj_ = self.mixedclass_(MixedContainer.CategorySimple,
                 MixedContainer.TypeString, 'sp', valuestr_)
             self.content_.append(obj_)
diff --git a/breathe/parser/index.py b/breathe/parser/index.py
index 3788991e..d4f0634b 100644
--- a/breathe/parser/index.py
+++ b/breathe/parser/index.py
@@ -49,7 +49,7 @@ class FileIOError(Exception):
 def parse(inFilename):
     try:
         doc = minidom.parse(inFilename)
-    except IOError as e:
+    except OSError as e:
         raise FileIOError(e)
     except ExpatError as e:
         raise ParseError(e)
diff --git a/breathe/parser/indexsuper.py b/breathe/parser/indexsuper.py
index 4c7126ce..8f748455 100644
--- a/breathe/parser/indexsuper.py
+++ b/breathe/parser/indexsuper.py
@@ -129,7 +129,7 @@ def getName(self):
         return self.name
 
 
-class _MemberSpec(object):
+class _MemberSpec:
     def __init__(self, name='', data_type='', container=0):
         self.name = name
         self.data_type = data_type
diff --git a/breathe/project.py b/breathe/project.py
index 865236e8..5c2b65d3 100644
--- a/breathe/project.py
+++ b/breathe/project.py
@@ -110,10 +110,9 @@ def __init__(self, app: Sphinx):
         self.app = app
         # note: don't access self.app.config now, as we are instantiated at setup-time.
 
-        # Assume general build directory is the doctree directory without the last component.
-        # We strip off any trailing slashes so that dirname correctly drops the last part.
+        # Assume general build directory is the parent of the doctree directory.
         # This can be overridden with the breathe_build_directory config variable
-        self._default_build_dir = os.path.dirname(app.doctreedir.rstrip(os.sep))
+        self._default_build_dir = os.path.dirname(os.path.normpath(app.doctreedir))
         self.project_count = 0
         self.project_info_store: Dict[str, ProjectInfo] = {}
         self.project_info_for_auto_store: Dict[str, AutoProjectInfo] = {}
diff --git a/breathe/renderer/sphinxrenderer.py b/breathe/renderer/sphinxrenderer.py
index dff0c982..a87fe0f2 100644
--- a/breathe/renderer/sphinxrenderer.py
+++ b/breathe/renderer/sphinxrenderer.py
@@ -2402,12 +2402,9 @@ def visit_docdotfile(self, node) -> List[Node]:
             # Use self.project_info.project_path as the XML_OUTPUT path, and
             # make it absolute with consideration to the conf.py path
             project_path = self.project_info.project_path()
-            if os.path.isabs(project_path):
-                dot_file_path = os.path.abspath(project_path + os.sep + dot_file_path)
-            else:
-                dot_file_path = os.path.abspath(
-                    self.app.confdir + os.sep + project_path + os.sep + dot_file_path
-                )
+            dot_file_path = os.path.abspath(
+                os.path.join(self.app.confdir, project_path, dot_file_path)
+            )
         try:
             with open(dot_file_path, encoding="utf-8") as fp:
                 dotcode = fp.read()
diff --git a/documentation/environment.yaml b/documentation/environment.yaml
index 9d1fb09d..3f019f13 100644
--- a/documentation/environment.yaml
+++ b/documentation/environment.yaml
@@ -11,4 +11,4 @@ dependencies:
   - doxygen
   - pip
   - pip:
-    - -r ../requirements/development.txt
+    - ".[docs,lint,test]"
diff --git a/documentation/make.bat b/documentation/make.bat
new file mode 100644
index 00000000..21f97a1c
--- /dev/null
+++ b/documentation/make.bat
@@ -0,0 +1,243 @@
+@ECHO OFF
+
+REM Command file for Sphinx documentation
+
+if "%SPHINXBUILD%" == "" (
+	set SPHINXBUILD=sphinx-build
+)
+set BUILDDIR=build
+set SRCDIR=source
+set ALLSPHINXOPTS=-d %BUILDDIR%/doctrees %SPHINXOPTS% %SRCDIR%
+set I18NSPHINXOPTS=%SPHINXOPTS% %SRCDIR%
+if NOT "%PAPER%" == "" (
+	set ALLSPHINXOPTS=-D latex_paper_size=%PAPER% %ALLSPHINXOPTS%
+	set I18NSPHINXOPTS=-D latex_paper_size=%PAPER% %I18NSPHINXOPTS%
+)
+
+if "%1" == "" goto help
+
+if "%1" == "help" (
+	:help
+	echo.Please use `make ^<target^>` where ^<target^> is one of
+	echo.  html       to make standalone HTML files
+	echo.  dirhtml    to make HTML files named index.html in directories
+	echo.  singlehtml to make a single large HTML file
+	echo.  pickle     to make pickle files
+	echo.  json       to make JSON files
+	echo.  htmlhelp   to make HTML files and a HTML help project
+	echo.  qthelp     to make HTML files and a qthelp project
+	echo.  devhelp    to make HTML files and a Devhelp project
+	echo.  epub       to make an epub
+	echo.  latex      to make LaTeX files, you can set PAPER=a4 or PAPER=letter
+	echo.  text       to make text files
+	echo.  man        to make manual pages
+	echo.  texinfo    to make Texinfo files
+	echo.  gettext    to make PO message catalogs
+	echo.  changes    to make an overview over all changed/added/deprecated items
+	echo.  xml        to make Docutils-native XML files
+	echo.  pseudoxml  to make pseudoxml-XML files for display purposes
+	echo.  linkcheck  to check all external links for integrity
+	echo.  doctest    to run all doctests embedded in the documentation if enabled
+	goto end
+)
+
+if "%1" == "clean" (
+	for /d %%i in (%BUILDDIR%\*) do rmdir /q /s %%i
+	del /q /s %BUILDDIR%\*
+	goto end
+)
+
+
+%SPHINXBUILD% 2> nul
+if errorlevel 9009 (
+	echo.
+	echo.The 'sphinx-build' command was not found. Make sure you have Sphinx
+	echo.installed, then set the SPHINXBUILD environment variable to point
+	echo.to the full path of the 'sphinx-build' executable. Alternatively you
+	echo.may add the Sphinx directory to PATH.
+	echo.
+	echo.If you don't have Sphinx installed, grab it from
+	echo.http://sphinx-doc.org/
+	exit /b 1
+)
+
+if "%1" == "html" (
+	%SPHINXBUILD% -b html %ALLSPHINXOPTS% %BUILDDIR%/html
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished. The HTML pages are in %BUILDDIR%/html.
+	goto end
+)
+
+if "%1" == "dirhtml" (
+	%SPHINXBUILD% -b dirhtml %ALLSPHINXOPTS% %BUILDDIR%/dirhtml
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished. The HTML pages are in %BUILDDIR%/dirhtml.
+	goto end
+)
+
+if "%1" == "singlehtml" (
+	%SPHINXBUILD% -b singlehtml %ALLSPHINXOPTS% %BUILDDIR%/singlehtml
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished. The HTML pages are in %BUILDDIR%/singlehtml.
+	goto end
+)
+
+if "%1" == "pickle" (
+	%SPHINXBUILD% -b pickle %ALLSPHINXOPTS% %BUILDDIR%/pickle
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished; now you can process the pickle files.
+	goto end
+)
+
+if "%1" == "json" (
+	%SPHINXBUILD% -b json %ALLSPHINXOPTS% %BUILDDIR%/json
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished; now you can process the JSON files.
+	goto end
+)
+
+if "%1" == "htmlhelp" (
+	%SPHINXBUILD% -b htmlhelp %ALLSPHINXOPTS% %BUILDDIR%/htmlhelp
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished; now you can run HTML Help Workshop with the ^
+.hhp project file in %BUILDDIR%/htmlhelp.
+	goto end
+)
+
+if "%1" == "qthelp" (
+	%SPHINXBUILD% -b qthelp %ALLSPHINXOPTS% %BUILDDIR%/qthelp
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished; now you can run "qcollectiongenerator" with the ^
+.qhcp project file in %BUILDDIR%/qthelp, like this:
+	echo.^> qcollectiongenerator %BUILDDIR%\qthelp\libuv.qhcp
+	echo.To view the help file:
+	echo.^> assistant -collectionFile %BUILDDIR%\qthelp\libuv.ghc
+	goto end
+)
+
+if "%1" == "devhelp" (
+	%SPHINXBUILD% -b devhelp %ALLSPHINXOPTS% %BUILDDIR%/devhelp
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished.
+	goto end
+)
+
+if "%1" == "epub" (
+	%SPHINXBUILD% -b epub %ALLSPHINXOPTS% %BUILDDIR%/epub
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished. The epub file is in %BUILDDIR%/epub.
+	goto end
+)
+
+if "%1" == "latex" (
+	%SPHINXBUILD% -b latex %ALLSPHINXOPTS% %BUILDDIR%/latex
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished; the LaTeX files are in %BUILDDIR%/latex.
+	goto end
+)
+
+if "%1" == "latexpdf" (
+	%SPHINXBUILD% -b latex %ALLSPHINXOPTS% %BUILDDIR%/latex
+	cd %BUILDDIR%/latex
+	make all-pdf
+	cd %BUILDDIR%/..
+	echo.
+	echo.Build finished; the PDF files are in %BUILDDIR%/latex.
+	goto end
+)
+
+if "%1" == "latexpdfja" (
+	%SPHINXBUILD% -b latex %ALLSPHINXOPTS% %BUILDDIR%/latex
+	cd %BUILDDIR%/latex
+	make all-pdf-ja
+	cd %BUILDDIR%/..
+	echo.
+	echo.Build finished; the PDF files are in %BUILDDIR%/latex.
+	goto end
+)
+
+if "%1" == "text" (
+	%SPHINXBUILD% -b text %ALLSPHINXOPTS% %BUILDDIR%/text
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished. The text files are in %BUILDDIR%/text.
+	goto end
+)
+
+if "%1" == "man" (
+	%SPHINXBUILD% -b man %ALLSPHINXOPTS% %BUILDDIR%/man
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished. The manual pages are in %BUILDDIR%/man.
+	goto end
+)
+
+if "%1" == "texinfo" (
+	%SPHINXBUILD% -b texinfo %ALLSPHINXOPTS% %BUILDDIR%/texinfo
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished. The Texinfo files are in %BUILDDIR%/texinfo.
+	goto end
+)
+
+if "%1" == "gettext" (
+	%SPHINXBUILD% -b gettext %I18NSPHINXOPTS% %BUILDDIR%/locale
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished. The message catalogs are in %BUILDDIR%/locale.
+	goto end
+)
+
+if "%1" == "changes" (
+	%SPHINXBUILD% -b changes %ALLSPHINXOPTS% %BUILDDIR%/changes
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.The overview file is in %BUILDDIR%/changes.
+	goto end
+)
+
+if "%1" == "linkcheck" (
+	%SPHINXBUILD% -b linkcheck %ALLSPHINXOPTS% %BUILDDIR%/linkcheck
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Link check complete; look for any errors in the above output ^
+or in %BUILDDIR%/linkcheck/output.txt.
+	goto end
+)
+
+if "%1" == "doctest" (
+	%SPHINXBUILD% -b doctest %ALLSPHINXOPTS% %BUILDDIR%/doctest
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Testing of doctests in the sources finished, look at the ^
+results in %BUILDDIR%/doctest/output.txt.
+	goto end
+)
+
+if "%1" == "xml" (
+	%SPHINXBUILD% -b xml %ALLSPHINXOPTS% %BUILDDIR%/xml
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished. The XML files are in %BUILDDIR%/xml.
+	goto end
+)
+
+if "%1" == "pseudoxml" (
+	%SPHINXBUILD% -b pseudoxml %ALLSPHINXOPTS% %BUILDDIR%/pseudoxml
+	if errorlevel 1 exit /b 1
+	echo.
+	echo.Build finished. The pseudo-XML files are in %BUILDDIR%/pseudoxml.
+	goto end
+)
+
+:end
\ No newline at end of file
diff --git a/documentation/source/conf.py b/documentation/source/conf.py
index c1cf8c34..a0868216 100644
--- a/documentation/source/conf.py
+++ b/documentation/source/conf.py
@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-#
 # BreatheExample documentation build configuration file, created by
 # sphinx-quickstart on Tue Feb  3 18:20:48 2009.
 #
@@ -35,6 +33,7 @@
     "sphinx.ext.ifconfig",
     "sphinx.ext.graphviz",
     "sphinx_copybutton",
+    "sphinxcontrib.spelling",
 ]
 
 read_the_docs_build = os.environ.get("READTHEDOCS", None) == "True"
@@ -122,17 +121,6 @@
     version = "compare"
     release = "compare"
 
-# Only add spelling extension if it is available. We don't know if it is installed as we don't want
-# to put it in the setup.py file as a dependency as we don't want Breathe to be dependent on it as
-# people should be able to use Breathe without 'spelling'. There might be a better way to handle
-# this.
-try:
-    import sphinxcontrib.spelling
-
-    extensions.append("sphinxcontrib.spelling")
-except ImportError:
-    pass
-
 
 # Configuration for spelling extension
 spelling_word_list_filename = "spelling_wordlist.txt"
diff --git a/examples/doxygen/make.bat b/examples/doxygen/make.bat
new file mode 100644
index 00000000..120e9b22
--- /dev/null
+++ b/examples/doxygen/make.bat
@@ -0,0 +1,111 @@
+@ECHO OFF
+
+set DOXYGEN=doxygen
+for /f "delims=" %%i in ('where doxygen') do set DOXYGEN=%%i
+
+set PERL=perl
+for /f "delims=" %%i in ('where perl') do set PERL=%%i
+
+set HAVE_DOT=dot
+for /f "delims=" %%i in ('where dot') do set HAVE_DOT=%%i
+
+@REM echo DOXYGEN  : %DOXYGEN%
+@REM echo PERL     : %PERL%
+@REM echo HAVE_DOT : %HAVE_DOT%
+
+if "%1" == "" (
+    call :all
+    goto end
+)
+
+if "%1" == "all" (
+    call :all
+    goto end
+)
+
+if "%1" == "clean" (
+    call :clean
+    goto end
+)
+
+goto end
+
+:all
+    call :doxygen class.cfg
+    call :doxygen concept.cfg
+    call :doxygen define.cfg
+    call :doxygen enum.cfg
+    call :doxygen file.cfg
+    call :doxygen func.cfg
+    call :doxygen page.cfg
+    call :doxygen relates.cfg
+    call :doxygen author.cfg
+    call :doxygen par.cfg
+    call :doxygen parblock.cfg
+    call :doxygen overload.cfg
+    call :doxygen example.cfg
+    call :doxygen include.cfg
+    call :doxygen qtstyle.cfg
+    call :doxygen jdstyle.cfg
+    call :doxygen structcmd.cfg
+    call :doxygen autolink.cfg
+    call :doxygen restypedef.cfg
+    call :doxygen afterdoc.cfg
+    call :doxygen templ.cfg
+    call :doxygen tag.cfg
+    call :doxygen group.cfg
+    call :doxygen diagrams.cfg
+    call :doxygen memgrp.cfg
+    call :doxygen docstring.cfg
+    call :doxygen pyexample.cfg
+    call :doxygen manual.cfg
+    call :doxygen interface.cfg
+    goto end
+
+:clean
+    call :rmdir class
+    call :rmdir concept
+    call :rmdir define
+    call :rmdir enum
+    call :rmdir file
+    call :rmdir func
+    call :rmdir page
+    call :rmdir relates
+    call :rmdir author
+    call :rmdir par
+    call :rmdir parblock
+    call :rmdir overload
+    call :rmdir example
+    call :rmdir include
+    call :rmdir qtstyle
+    call :rmdir jdstyle
+    call :rmdir structcmd
+    call :rmdir autolink
+    call :rmdir restypedef
+    call :rmdir afterdoc
+    call :rmdir template
+    call :rmdir tag
+    call :rmdir group
+    call :rmdir diagrams
+    call :rmdir memgrp
+    call :rmdir docstring
+    call :rmdir pyexample
+    call :rmdir manual
+    call :rmdir interface
+    goto end
+
+:doxygen
+    set CFG=%~1
+    echo Running doxygen: %CFG%
+    "%DOXYGEN%" %CFG%
+    goto end
+
+:rmdir
+    set DIR=%~1
+    if exist "%DIR%" (
+        echo Removing directory: %DIR%
+        rmdir /s/q "%DIR%"
+    )
+    goto end
+
+:end
\ No newline at end of file
diff --git a/examples/specific/make.bat b/examples/specific/make.bat
new file mode 100644
index 00000000..f8a57423
--- /dev/null
+++ b/examples/specific/make.bat
@@ -0,0 +1,183 @@
+@ECHO OFF
+
+set DOXYGEN=doxygen
+for /f "delims=" %%i in ('where doxygen') do set DOXYGEN=%%i
+
+set PERL=perl
+for /f "delims=" %%i in ('where perl') do set PERL=%%i
+
+set HAVE_DOT=dot
+for /f "delims=" %%i in ('where dot') do set HAVE_DOT=%%i
+
+@REM echo DOXYGEN  : %DOXYGEN%
+@REM echo PERL     : %PERL%
+@REM echo HAVE_DOT : %HAVE_DOT%
+
+if "%1" == "" (
+    call :all
+    goto end
+)
+
+if "%1" == "all" (
+    call :all
+    goto end
+)
+
+if "%1" == "clean" (
+    call :clean
+    goto end
+)
+
+goto end
+
+:all
+    @REM ---------------
+    @REM General Pattern
+    @REM ---------------
+    call :doxygen nutshell.cfg
+    call :doxygen alias.cfg
+    call :doxygen rst.cfg
+    call :doxygen inline.cfg
+    call :doxygen namespacefile.cfg
+    call :doxygen array.cfg
+    call :doxygen inheritance.cfg
+    call :doxygen members.cfg
+    call :doxygen userdefined.cfg
+    call :doxygen fixedwidthfont.cfg
+    call :doxygen latexmath.cfg
+    call :doxygen functionOverload.cfg
+    call :doxygen image.cfg
+    call :doxygen name.cfg
+    call :doxygen union.cfg
+    call :doxygen group.cfg
+    call :doxygen struct.cfg
+    call :doxygen struct_function.cfg
+    call :doxygen qtsignalsandslots.cfg
+    call :doxygen lists.cfg
+    call :doxygen headings.cfg
+    call :doxygen links.cfg
+    call :doxygen parameters.cfg
+    call :doxygen template_class.cfg
+    call :doxygen template_class_non_type.cfg
+    call :doxygen template_function.cfg
+    call :doxygen template_type_alias.cfg
+    call :doxygen template_specialisation.cfg
+    call :doxygen enum.cfg
+    call :doxygen define.cfg
+    call :doxygen interface.cfg
+    call :doxygen xrefsect.cfg
+    call :doxygen tables.cfg
+    call :doxygen cpp_anon.cfg
+    call :doxygen cpp_concept.cfg
+    call :doxygen cpp_enum.cfg
+    call :doxygen cpp_union.cfg
+    call :doxygen cpp_function.cfg
+    call :doxygen cpp_friendclass.cfg
+    call :doxygen cpp_inherited_members.cfg
+    call :doxygen cpp_trailing_return_type.cfg
+    call :doxygen cpp_constexpr_hax.cfg
+    call :doxygen cpp_function_lookup.cfg
+    call :doxygen c_file.cfg
+    call :doxygen c_struct.cfg
+    call :doxygen c_enum.cfg
+    call :doxygen c_typedef.cfg
+    call :doxygen c_macro.cfg
+    call :doxygen c_union.cfg
+    call :doxygen membergroups.cfg
+    call :doxygen simplesect.cfg
+    call :doxygen code_blocks.cfg
+    call :doxygen dot_graphs.cfg
+    @REM -------------
+    @REM Special Cases
+    @REM -------------
+    call :doxygen programlisting.cfg
+    call :doxygen decl_impl.cfg
+    call :doxygen multifile.cfg
+    call :doxygen auto.cfg
+    call :doxygen class.cfg
+    call :doxygen typedef.cfg
+    goto end
+
+:clean
+    @REM ---------------
+    @REM General Pattern
+    @REM ---------------
+    call :rmdir nutshell
+    call :rmdir alias
+    call :rmdir rst
+    call :rmdir inline
+    call :rmdir namespacefile
+    call :rmdir array
+    call :rmdir inheritance
+    call :rmdir members
+    call :rmdir userdefined
+    call :rmdir fixedwidthfont
+    call :rmdir latexmath
+    call :rmdir functionOverload
+    call :rmdir image
+    call :rmdir name
+    call :rmdir union
+    call :rmdir group
+    call :rmdir struct
+    call :rmdir struct_function
+    call :rmdir qtsignalsandslots
+    call :rmdir lists
+    call :rmdir headings
+    call :rmdir links
+    call :rmdir parameters
+    call :rmdir template_class
+    call :rmdir template_class_non_type
+    call :rmdir template_function
+    call :rmdir template_type_alias
+    call :rmdir template_specialisation
+    call :rmdir enum
+    call :rmdir define
+    call :rmdir interface
+    call :rmdir xrefsect
+    call :rmdir tables
+    call :rmdir cpp_anon
+    call :rmdir cpp_concept
+    call :rmdir cpp_enum
+    call :rmdir cpp_union
+    call :rmdir cpp_function
+    call :rmdir cpp_friendclass
+    call :rmdir cpp_inherited_members
+    call :rmdir cpp_trailing_return_type
+    call :rmdir cpp_constexpr_hax
+    call :rmdir cpp_function_lookup
+    call :rmdir c_file
+    call :rmdir c_struct
+    call :rmdir c_enum
+    call :rmdir c_typedef
+    call :rmdir c_macro
+    call :rmdir c_union
+    call :rmdir membergroups
+    call :rmdir simplesect
+    call :rmdir code_blocks
+    call :rmdir dot_graphs
+    @REM -------------
+    @REM Special Cases
+    @REM -------------
+    call :rmdir programlisting
+    call :rmdir decl_impl
+    call :rmdir multifilexml
+    call :rmdir auto
+    call :rmdir class
+    call :rmdir typedef
+    goto end
+
+:doxygen
+    set CFG=%~1
+    echo Running doxygen: %CFG%
+    "%DOXYGEN%" %CFG%
+    goto end
+
+:rmdir
+    set DIR=%~1
+    if exist "%DIR%" (
+        echo Removing directory: %DIR%
+        rmdir /s/q "%DIR%"
+    )
+    goto end
+
+:end
\ No newline at end of file
diff --git a/examples/tinyxml/make.bat b/examples/tinyxml/make.bat
new file mode 100644
index 00000000..66f01a8c
--- /dev/null
+++ b/examples/tinyxml/make.bat
@@ -0,0 +1,55 @@
+@ECHO OFF
+
+set DOXYGEN=doxygen
+for /f "delims=" %%i in ('where doxygen') do set DOXYGEN=%%i
+
+set PERL=perl
+for /f "delims=" %%i in ('where perl') do set PERL=%%i
+
+set HAVE_DOT=dot
+for /f "delims=" %%i in ('where dot') do set HAVE_DOT=%%i
+
+@REM echo DOXYGEN  : %DOXYGEN%
+@REM echo PERL     : %PERL%
+@REM echo HAVE_DOT : %HAVE_DOT%
+
+if "%1" == "" (
+    call :all
+    goto end
+)
+
+if "%1" == "all" (
+    call :all
+    goto end
+)
+
+if "%1" == "clean" (
+    call :clean
+    goto end
+)
+
+goto end
+
+:all
+    call :doxygen tinyxml.cfg
+    goto end
+
+:clean
+    call :rmdir tinyxml
+    goto end
+
+:doxygen
+    set CFG=%~1
+    echo Running doxygen: %CFG%
+    "%DOXYGEN%" %CFG%
+    goto end
+
+:rmdir
+    set DIR=%~1
+    if exist "%DIR%" (
+        echo Removing directory: %DIR%
+        rmdir /s/q "%DIR%"
+    )
+    goto end
+
+:end
\ No newline at end of file
diff --git a/make.bat b/make.bat
new file mode 100644
index 00000000..b68c75be
--- /dev/null
+++ b/make.bat
@@ -0,0 +1,97 @@
+@ECHO OFF
+
+if "%1" == "html"           goto html
+if "%1" == "pdf"            goto pdf
+if "%1" == "data"           goto data
+if "%1" == "clean"          goto clean
+if "%1" == "distclean"      goto distclean
+if "%1" == "test"           goto test
+if "%1" == "dev-test"       goto dev-test
+if "%1" == "flake8"         goto flake8
+if "%1" == "black"          goto black
+if "%1" == "type-check"     goto type-check
+if "%1" == "version-check"  goto version-check
+if "%1" == "all"            goto all
+goto end
+
+:html
+    call :data
+    cd documentation
+    call make.bat html
+    cd ..
+    goto end
+
+:pdf
+    call :data
+    cd documentation
+    call make.bat latexpdf
+    cd ..
+    goto end
+
+:data
+    cd examples\doxygen
+    call make.bat all
+    cd ..\..
+    cd examples\tinyxml
+    call make.bat all
+    cd ..\..
+    cd examples\specific
+    call make.bat all
+    cd ..\..
+    goto end
+
+:clean
+    cd examples\doxygen
+    call make.bat clean
+    cd ..\..
+    cd examples\tinyxml
+    call make.bat clean
+    cd ..\..
+    cd examples\specific
+    call make.bat clean
+    cd ..\..
+    goto end
+
+:distclean
+    call :clean
+    cd documentation
+    call make.bat clean
+    cd ..
+    goto end
+
+:test
+    cd tests
+    python -m pytest -v
+    cd ..
+    goto end
+
+:dev-test
+    cd tests
+    set PYTHONPATH=..\;%PYTHONPATH%
+    python -m pytest -v
+    cd ..
+    goto end
+
+:flake8
+    flake8 breathe
+    goto end
+
+:black
+    black --check .
+    goto end
+
+:type-check
+    mypy --warn-redundant-casts --warn-unused-ignores breathe tests
+    goto end
+
+:version-check
+    set PYTHONPATH=..\;%PYTHONPATH%
+    python scripts\version-check.py
+    goto end
+
+:all
+    call :html
+    call :pdf
+    goto end
+
+:end
\ No newline at end of file
diff --git a/mkrelease b/mkrelease
index 545a75fa..c0a95c84 100755
--- a/mkrelease
+++ b/mkrelease
@@ -40,7 +40,7 @@ pack()
 	tar -xf "breathe-$version.tar.gz"
 
 	cd -- "breathe-$version"
-	python3 setup.py sdist bdist_wheel
+	python3 -m build
 	mv -- dist ..
 
 	cd -- ..
@@ -66,6 +66,7 @@ upload()
 (
 	cd -- mkrelease_tmp
 
+	twine check --strict dist/*
 	twine upload -- dist/*
 
 	{
diff --git a/pyproject.toml b/pyproject.toml
index 15f421bb..1f21f7a5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,3 +1,102 @@
+[build-system]
+requires = ["flit_core>=3.7"]
+build-backend = "flit_core.buildapi"
+
+# project metadata
+[project]
+name = "breathe"
+description = "Sphinx Doxygen renderer"
+readme = "README.rst"
+urls.Changelog = "https://github.com/breathe-doc/breathe/blob/main/CHANGELOG.rst"
+urls.Code = "https://github.com/breathe-doc/breathe/"
+urls.Download = "https://pypi.org/project/breathe/"
+urls.Documentation = "https://breathe.readthedocs.io/"
+urls.Homepage = "https://www.breathe-doc.org/"
+urls."Issue tracker" = "https://github.com/breathe-doc/breathe/issues"
+license.text = "BSD-3-Clause"
+requires-python = ">=3.8"
+
+# Classifiers list: https://pypi.org/classifiers/
+classifiers = [
+    "Development Status :: 5 - Production/Stable",
+    "Environment :: Console",
+    "Environment :: Web Environment",
+    "Framework :: Sphinx",
+    "Framework :: Sphinx :: Extension",
+    "Intended Audience :: Developers",
+    "Intended Audience :: Education",
+    "License :: OSI Approved :: BSD License",
+    "Operating System :: OS Independent",
+    "Programming Language :: Python",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3 :: Only",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Topic :: Documentation",
+    "Topic :: Documentation :: Sphinx",
+    "Topic :: Software Development",
+    "Topic :: Software Development :: Documentation",
+    "Topic :: Text Processing",
+    "Topic :: Utilities",
+]
+dependencies = [
+    "Sphinx>=5.0.2",
+    "docutils>=0.12",
+    "Jinja2>=2.7.3",
+    "MarkupSafe>=0.23",
+    "Pygments>=1.6",
+]
+dynamic = ["version"]
+
+[project.optional-dependencies]
+docs = [
+    "furo",
+    "sphinx-copybutton",
+    "sphinxcontrib-spelling",
+]
+lint = [
+    "black==22.3.0",
+    "flake8>=6.0",
+    "mypy>=1",
+    "types-docutils",
+    "types-Pygments",
+]
+test = [
+    "pytest>=8.0",
+]
+
+[[project.authors]]
+name = "Michael Jones"
+email = "m.pricejones@gmail.com"
+
+[project.scripts]
+breathe-apidoc = "breathe.apidoc:main"
+
+[tool.flit.module]
+name = "breathe"
+
+[tool.flit.sdist]
+include = [
+    "LICENSE",
+    "CHANGELOG.rst",
+    "CONTRIBUTING.rst",
+    "CONTRIBUTORS.rst",
+    # Documentation
+    "documentation/",
+    # Tests
+    "tests/",
+    # Utilities
+    "Makefile",
+    "mkrelease",
+]
+exclude = [
+    "documentation/build",
+]
+
 [tool.black]
 line-length = 100
 extend-exclude = '''
diff --git a/requirements/development.txt b/requirements/development.txt
deleted file mode 100644
index 35b1c56d..00000000
--- a/requirements/development.txt
+++ /dev/null
@@ -1,14 +0,0 @@
--r production.txt
-
-flake8
-pip-tools>=0.3.5
-pytest
-
-mypy>=0.900
-types-docutils>=0.14,<0.18
-types-Pygments
-
-black==22.3.0
-
-sphinx-copybutton
-furo
\ No newline at end of file
diff --git a/requirements/production.txt b/requirements/production.txt
deleted file mode 100644
index 816dbe45..00000000
--- a/requirements/production.txt
+++ /dev/null
@@ -1,5 +0,0 @@
-docutils>=0.12
-Jinja2>=2.7.3
-MarkupSafe>=0.23
-Pygments>=1.6
-Sphinx>=4.0,!=5.0.0
diff --git a/scripts/version-check.py b/scripts/version-check.py
deleted file mode 100644
index 2ad59ccb..00000000
--- a/scripts/version-check.py
+++ /dev/null
@@ -1,28 +0,0 @@
-"""
-This script is designed to check that the version numbers that we have in place stay in sync. The
-script fails with exit code 1 if they are not the same and always prints the current status.
-"""
-
-import sys
-import re
-
-import breathe
-
-setup_version = ""
-with open("setup.py") as setup:
-    for line in setup:
-        if line.startswith("__version__"):
-            match = re.search('"(?P<version>[^"]*)"', line)
-            if match:
-                setup_version = match.group("version")
-
-if setup_version == breathe.__version__:
-    print("Versions match")
-    print(f"  {setup_version}")
-    print(f"  {breathe.__version__}")
-    sys.exit(0)
-else:
-    print("Versions do not match")
-    print(f"  {setup_version}")
-    print(f"  {breathe.__version__}")
-    sys.exit(1)
diff --git a/setup.py b/setup.py
deleted file mode 100644
index eed8907d..00000000
--- a/setup.py
+++ /dev/null
@@ -1,61 +0,0 @@
-# -*- coding: utf-8 -*-
-try:
-    from setuptools import setup, find_packages
-except ImportError:
-    import distribute_setup
-
-    distribute_setup.use_setuptools()
-    from setuptools import setup, find_packages
-
-import sys
-
-# Keep in sync with breathe/__init__.py __version__
-__version__ = "4.35.0"
-
-long_desc = """
-Breathe is an extension to reStructuredText and Sphinx to be able to read and
- render `Doxygen <http://www.doxygen.org>`__ xml output.
-"""
-
-requires = ["Sphinx>=4.0,!=5.0.0", "docutils>=0.12"]
-
-if sys.version_info < (3, 7):
-    print("ERROR: Sphinx requires at least Python 3.7 to run.")
-    sys.exit(1)
-
-
-setup(
-    name="breathe",
-    version=__version__,
-    url="https://github.com/michaeljones/breathe",
-    download_url="https://github.com/michaeljones/breathe",
-    license="BSD",
-    author="Michael Jones",
-    author_email="m.pricejones@gmail.com",
-    description="Sphinx Doxygen renderer",
-    long_description=long_desc,
-    zip_safe=False,
-    classifiers=[
-        "Development Status :: 4 - Beta",
-        "Environment :: Console",
-        "Environment :: Web Environment",
-        "Framework :: Sphinx :: Extension",
-        "Intended Audience :: Developers",
-        "Intended Audience :: Education",
-        "License :: OSI Approved :: BSD License",
-        "Operating System :: OS Independent",
-        "Programming Language :: Python :: 3",
-        "Topic :: Documentation",
-        "Topic :: Text Processing",
-        "Topic :: Utilities",
-    ],
-    platforms="any",
-    packages=find_packages(),
-    include_package_data=True,
-    entry_points={
-        "console_scripts": [
-            "breathe-apidoc = breathe.apidoc:main",
-        ],
-    },
-    install_requires=requires,
-)
diff --git a/tests/test_renderer.py b/tests/test_renderer.py
index a858c65d..0fd044a5 100644
--- a/tests/test_renderer.py
+++ b/tests/test_renderer.py
@@ -35,7 +35,7 @@ def app(test_params, app_params, make_app, shared_result):
     """
     args, kwargs = app_params
     assert "srcdir" in kwargs
-    kwargs["srcdir"].makedirs(exist_ok=True)
+    os.makedirs(kwargs["srcdir"], exist_ok=True)
     (kwargs["srcdir"] / "conf.py").write_text("")
     app_ = make_app(*args, **kwargs)
     yield app_
diff --git a/tests/warnings/source/conf.py b/tests/warnings/source/conf.py
index 3dfc126d..7dde9c8b 100644
--- a/tests/warnings/source/conf.py
+++ b/tests/warnings/source/conf.py
@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-#
 # Test Breathe Warnings documentation build configuration file, created by
 # sphinx-quickstart on Thu Jun  5 18:57:21 2014.
 #