diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index b7d25682..4baaef6e 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -4,13 +4,13 @@ on: [ push, pull_request ]
 
 jobs:
   main:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     strategy:
       matrix:
         python-version: ["3.12"]
     steps:
     - uses: actions/checkout@master
-    - uses: actions/setup-python@v5
+    - uses: actions/setup-python@v6
       name: Setup Python ${{ matrix.python-version }}
       with:
         python-version: ${{ matrix.python-version }}
@@ -19,15 +19,15 @@ jobs:
     - name: Install requirements 📦
       run: |
         pip3 install -e .
-        pip3 install -r requirements.txt
-        pip3 install -r requirements-dev.txt
-        pip3 install -r docs/requirements.txt
+        pip3 install ".[dev]"
+        pip3 install ".[docs]"
+        pip3 install ".[test]"
     - name: run tests ⚙️
-      run: python3 -m pytest
+      run: pytest tests/
     - name: run tests in offline mode
       if: matrix.python-version == '3.12'
       run: |
-          python3 -m pytest \
+          pytest tests/\
             -m "not online" \
             --disable-socket \
             --deselect="tests/doctests/wcs_thredds.txt::wcs_thredds.txt" \
@@ -45,4 +45,4 @@ jobs:
     - name: build docs 🏗️
       run: cd docs && make html
     - name: run flake8 ⚙️
-      run: flake8 owslib
+      run: flake8 owslib/
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 814ef3ff..4b2d503a 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -10,7 +10,7 @@ jobs:
         python-version: ["3.12"]
     steps:
     - uses: actions/checkout@master
-    - uses: actions/setup-python@v5
+    - uses: actions/setup-python@v6
       name: Setup Python ${{ matrix.python-version }}
       with:
         python-version: ${{ matrix.python-version }}
@@ -18,8 +18,9 @@ jobs:
     - name: Install requirements 📦
       run: |
         pip install -e .
-        pip install -r requirements.txt
-        pip install -r requirements-dev.txt
+        pip install ".[dev]"
+        pip install ".[docs]"
+        pip install ".[test]"
 
     - name: run tests ⚙️
-      run: python -m pytest
+      run: pytest tests/
diff --git a/MANIFEST.in b/MANIFEST.in
index 1a68d690..26311789 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,5 +1,2 @@
-include LICENSE
-include *.md
-include *.rst
-include *.txt
-recursive-exclude tests *
\ No newline at end of file
+# this file controls the contents of sdist
+prune tests
diff --git a/README.md b/README.md
index c5f7ed4a..f8656295 100644
--- a/README.md
+++ b/README.md
@@ -147,7 +147,7 @@ Releasing
 
 ```bash
   # update version
-  vi owslib/__init__.py
+  vi pyproject.toml  # update [project]/version
   git commit -m 'update release version' owslib/__init__.py
   # push changes
   git push origin master
diff --git a/owslib/__init__.py b/owslib/__init__.py
index 06cc0f1e..af87e902 100644
--- a/owslib/__init__.py
+++ b/owslib/__init__.py
@@ -1 +1,12 @@
-__version__ = '0.36.dev0'
+# -*- coding: ISO-8859-15 -*-
+# =============================================================================
+# Copyright (c) 2026 Tom Kralidis
+#
+# Authors : Tom Kralidis <tomkralidis@gmail.com>
+#
+# Contact email: tomkralidis@gmail.com
+# =============================================================================
+
+from owslib.util import get_package_version
+
+__version__ = get_package_version()
diff --git a/owslib/util.py b/owslib/util.py
index 4eb33495..ab6c762b 100644
--- a/owslib/util.py
+++ b/owslib/util.py
@@ -1,6 +1,6 @@
 # -*- coding: ISO-8859-15 -*-
 # =============================================================================
-# Copyright (c) 2025 Tom Kralidis
+# Copyright (c) 2026 Tom Kralidis
 #
 # Authors : Tom Kralidis <tomkralidis@gmail.com>
 #
@@ -12,6 +12,7 @@
 import copy
 from copy import deepcopy
 from datetime import datetime, timedelta, timezone
+import importlib.metadata
 from io import StringIO, BytesIO
 import os
 import re
@@ -1068,3 +1069,13 @@ def str2bool(value: Union[bool, str]) -> bool:
         value2 = value.lower() in ('yes', 'true', 't', '1', 'on')
 
     return value2
+
+
+def get_package_version() -> str:
+    """
+    Helper function to get package version
+
+    :returns: `str` of version of package
+    """
+
+    return importlib.metadata.version('OWSLib')
diff --git a/pyproject.toml b/pyproject.toml
index 205a289e..0a3252ce 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,3 +1,61 @@
 [build-system]
-requires = ["setuptools>=46.4", "wheel"]
+requires = ["setuptools<69", "wheel"]
 build-backend = "setuptools.build_meta"
+
+[project]
+name = "OWSLib"
+version = "0.36.dev0"
+description = "OGC Web Service utility library"
+readme = "README.md"
+requires-python = ">=3.12"
+license = {text = "BSD-3-Clause"}
+keywords = ["gis", "ogc", "ogcapi", "ows", "opensearch", "iso", "19115", "fgdc", "dif", "ows", "wfs", "wms", "sos", "csw", "wps", "wcs", "capabilities", "metadata", "wmts", "connectedsystems"]
+authors = [
+    {name = "Sean Gillies", email = "sean.gillies@gmail.com"},
+    {name = "Tom Kralidis", email = "tomkralidis@gmail.com"}
+]
+maintainers = [
+    {name = "Tom Kralidis", email = "tomkralidis@gmail.com"}
+]
+classifiers = [
+    "Development Status :: 4 - Beta",
+    "Environment :: Console",
+    "Intended Audience :: Developers",
+    "Intended Audience :: Science/Research",
+    "Operating System :: OS Independent",
+    "Programming Language :: Python",
+    "Topic :: Scientific/Engineering :: GIS"
+]
+dependencies = [
+    "lxml",
+    "python-dateutil",
+    "pyyaml",
+    "requests"
+]
+
+[project.optional-dependencies]
+dev = ["flake8", "flake8-pyproject", "pytest", "pytest-cov", "pytest_httpserver", "pytest-socket", "Pillow", "tox", "twine", "coverage", "coveralls", "build"]
+docs = ["ipykernel", "nbconvert", "nbsphinx", "pypandoc", "sphinx==8.1.3"]
+release = ["build", "twine", "wheel"]
+test = ["pytest"]
+
+[project.urls]
+homepage = "https://geopython.github.io/OWSLib"
+source = "https://github.com/geopython/OWSLib"
+documentation = "https://geopython.github.io/OWSLib"
+issues = "https://github.com/geopython/OWSLib/issues"
+
+[tool.pytest]
+addopts = ["-v", "-rxs", "-s", "--color=yes", "--tb=native", "--ignore=setup.py", "--doctest-modules", "--doctest-glob='tests/**/*.txt'", "--cov-report=term-missing", "--cov=owslib"]
+
+norecursedirs = [".git", "docs", "examples", "etc", "cov*", "*.egg*", "pytest*", ".tox", "_broken"]
+markers = ["online: test requires online resources."]
+
+[tool.flake8]
+ignore = ["F401", "E402"]
+max-line-length = 120
+exclude = [".git", "__pycache__", "docs/source/conf.py,", "build", "dist", "examples", "etc"]
+
+# ensure all subpackages are found
+[tool.setuptools.packages.find]
+include = ["owslib*"]
\ No newline at end of file
diff --git a/requirements-dev.txt b/requirements-dev.txt
deleted file mode 100644
index 785f2e44..00000000
--- a/requirements-dev.txt
+++ /dev/null
@@ -1,12 +0,0 @@
--r requirements.txt
-flake8
-pytest
-pytest-cov
-pytest_httpserver 
-pytest-socket
-Pillow
-tox
-twine
-coverage
-coveralls
-build
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index f4d78980..00000000
--- a/requirements.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-lxml
-python-dateutil
-pyyaml
-requests
diff --git a/setup.py b/setup.py
deleted file mode 100644
index dab770f0..00000000
--- a/setup.py
+++ /dev/null
@@ -1,88 +0,0 @@
-# =============================================================================
-# Copyright (c) 2025 Tom Kralidis
-#
-# Author: Tom Kralidis <tomkralidis@gmail.com>
-#
-# Contact email: tomkralidis@gmail.com
-# =============================================================================
-
-from pathlib import Path
-import re
-from setuptools import setup, find_packages
-
-
-def read(filename, encoding='utf-8'):
-    """read file contents"""
-
-    fullpath = Path(__file__).resolve().parent / filename
-
-    with fullpath.open() as fh:
-        contents = fh.read().strip()
-    return contents
-
-
-def get_package_version():
-    """get version from top-level package init"""
-    version_file = read('owslib/__init__.py')
-    version_match = re.search(r"^__version__ = ['\"]([^'\"]*)['\"]",
-                              version_file, re.M)
-    if version_match:
-        return version_match.group(1)
-    raise RuntimeError('Unable to find version string.')
-
-
-readme = open('README.md').read()
-reqs = [line.strip() for line in open('requirements.txt')]
-
-MANIFEST = Path('MANIFEST')
-
-if MANIFEST.exists():
-    MANIFEST.unlink()
-
-setup(
-    name='OWSLib',
-    version=get_package_version(),
-    description='OGC Web Service utility library',
-    long_description=read('README.md'),
-    long_description_content_type='text/markdown',
-    license='BSD',
-    keywords=' '.join([
-        'gis',
-        'ogc',
-        'ogcapi',
-        'ows',
-        'opensearch',
-        'iso',
-        '19115',
-        'fgdc',
-        'dif',
-        'ows',
-        'wfs',
-        'wms',
-        'sos',
-        'csw',
-        'wps',
-        'wcs',
-        'capabilities',
-        'metadata',
-        'wmts',
-        'connectedsystems'
-    ]),
-    author='Sean Gillies',
-    author_email='sean.gillies@gmail.com',
-    maintainer='Tom Kralidis',
-    maintainer_email='tomkralidis@gmail.com',
-    url='https://owslib.readthedocs.io',
-    install_requires=reqs,
-    python_requires='>=3.10',
-    packages=find_packages(exclude=["docs", "etc", "examples", "tests"]),
-    classifiers=[
-        'Development Status :: 4 - Beta',
-        'Intended Audience :: Developers',
-        'Intended Audience :: Science/Research',
-        'Natural Language :: English',
-        'Operating System :: OS Independent',
-        'Programming Language :: Python',
-        'Topic :: Scientific/Engineering :: GIS'
-    ]
-)
diff --git a/tests/test_ogcapi_records_pycsw.py b/tests/test_ogcapi_records_pycsw.py
index 6b2c9274..b7c6b717 100644
--- a/tests/test_ogcapi_records_pycsw.py
+++ b/tests/test_ogcapi_records_pycsw.py
@@ -40,7 +40,7 @@ def test_ogcapi_records_pycsw():
     assert isinstance(w.response, dict)
 
     pycsw_cite_demo_queryables = w.collection_queryables('metadata:main')
-    assert len(pycsw_cite_demo_queryables['properties'].keys()) == 14
+    assert len(pycsw_cite_demo_queryables['properties'].keys()) == 18
 
     # Minimum of limit param is 1
     with pytest.raises(RuntimeError):
diff --git a/tests/test_wfs_generic.py b/tests/test_wfs_generic.py
index 6a0c2344..1f2234fa 100644
--- a/tests/test_wfs_generic.py
+++ b/tests/test_wfs_generic.py
@@ -1,13 +1,13 @@
 from owslib.wfs import WebFeatureService
 from owslib.util import ServiceException
 from owslib.fes import PropertyIsLike, etree
-from urllib.parse import urlparse
 from tests.utils import resource_file, sorted_url_query, service_ok
 import json
 import pytest
 
 SERVICE_URL = 'https://services.ga.gov.au/gis/stratunits/ows'
 
+
 def test_caps_info():
     getcapsin = open(resource_file("wfs_HSRS_GetCapabilities_1_1_0.xml"), "rb").read()
     wfs = WebFeatureService('http://gis.bnhelp.cz/ows/crwfs', xml=getcapsin, version='1.1.0')
@@ -143,17 +143,6 @@ def test_srsname_wfs_200():
     assert len(json.loads(feature.read())['features']) == 1
 
 
-@pytest.mark.online
-@pytest.mark.skipif(not service_ok(SERVICE_URL),
-                    reason="WFS service is unreachable")
-def test_schema_wfs_100():
-    wfs = WebFeatureService(SERVICE_URL, version='1.0.0')
-    schema = wfs.get_schema('stratunit:StratigraphicUnit')
-    assert len(schema['properties']) == 33
-    assert schema['properties']['DESCRIPTION'] == 'string'
-    assert schema['geometry'] is None
-
-
 @pytest.mark.online
 @pytest.mark.skipif(not service_ok(SERVICE_URL),
                     reason="WFS service is unreachable")
@@ -183,7 +172,7 @@ def test_schema_wfs_200():
 def test_xmlfilter_wfs_110():
     wfs = WebFeatureService(SERVICE_URL, version='1.1.0')
     filter_prop = PropertyIsLike(propertyname='stratunit:GEOLOGICHISTORY', literal='Cisuralian - Guadalupian',
-        matchCase=True)
+                                 matchCase=True)
 
     filterxml = etree.tostring(filter_prop.toXML()).decode("utf-8")
 
@@ -200,7 +189,7 @@ def test_xmlfilter_wfs_110():
 def test_xmlfilter_wfs_200():
     wfs = WebFeatureService(SERVICE_URL,  version='2.0.0')
     filter_prop = PropertyIsLike(propertyname='stratunit:geologichistory', literal='Cisuralian - Guadalupian',
-        matchCase=True)
+                                 matchCase=True)
 
     filterxml = etree.tostring(filter_prop.toXML()).decode("utf-8")
 
@@ -208,4 +197,3 @@ def test_xmlfilter_wfs_200():
 
     response = wfs.getfeature(**getfeat_params).read()
     assert b'<stratunit:NAME>Boolgeeda Iron Formation</stratunit:NAME>' in response
-
diff --git a/tox.ini b/tox.ini
deleted file mode 100644
index 935ef79e..00000000
--- a/tox.ini
+++ /dev/null
@@ -1,39 +0,0 @@
-[pytest]
-addopts = 
-    -v
-    -rxs
-    -s
-    --color=yes
-    --tb=native
-    --ignore=setup.py
-    --doctest-modules
-    --doctest-glob='tests/**/*.txt'
-    --cov-report=term-missing
-    --cov=owslib
-
-norecursedirs = .git docs examples etc cov* *.egg* pytest* .tox _broken
-markers =
-    online: test requires online resources.
-
-[flake8]
-ignore=F401,E402
-max-line-length=120
-exclude =
-    .git,
-    __pycache__,
-    docs/source/conf.py,
-    build,
-    dist
-    examples,
-    etc,
-
-[tox]
-skipsdist=True
-
-[testenv]
-recreate=False
-commands=
-    python3 setup.py develop
-    py.test \
-        --basetemp={envtmpdir} \
-        {posargs}