diff --git a/.github/workflows/run_tests.yml b/.github/workflows/run_tests.yml
index 67209c2..6e95c36 100644
--- a/.github/workflows/run_tests.yml
+++ b/.github/workflows/run_tests.yml
@@ -19,6 +19,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0  # Fetch full history for setuptools_scm
 
     - name: Log reason (manual run only)
       if: github.event_name == 'workflow_dispatch'
@@ -28,23 +30,33 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
-        python-version: 3.11
+        python-version: 3.13
+
+    - name: Install system dependencies
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y build-essential pkg-config zlib1g-dev libtool autotools-dev
 
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
         python -m pip install setuptools>=61.0
         python -m pip install -r requirements.txt
+        python -m pip install opentype-sanitizer
+
+    - name: Download OTS source
+      run: |
+        python setup.py download --version=9.2.0 --sha256=1a1e50cd7ecea27c4ef04c5b1491c21e75555f35bf91e27103ede04ddd11e053
     
     - name: Lint with flake8
       run: flake8 . --show-source --statistics
     
     - name: Lint with cpplint
-      run: cpplint --filter=-build/includesubdir,-readability/casting,-build/include --recursive .
+      run: cpplint --filter=-build/includesubdir,-readability/casting,-build/include --recursive src/_pyots/
     
     - name: Build and install
       run: |
-        python setup.py install
+        python -m pip install -v .
     
     - name: Test with pytest
       run: |
diff --git a/pyproject.toml b/pyproject.toml
index ddc46f2..2a86497 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,41 @@
 [build-system]
 requires = ["setuptools>=61", "wheel", "setuptools_scm[toml]>=3.4", "ninja", "meson"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "pyots"
+description = "Python wrapper for ot-sanitizer"
+readme = "README.md"
+license = "BSD-3-Clause"
+authors = [
+    {name = "Adobe Type team & friends", email = "afdko@adobe.com"}
+]
+classifiers = [
+    "Development Status :: 4 - Beta",
+    "Intended Audience :: Developers",
+    "Topic :: Software Development :: Testing",
+    "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",
+    "Operating System :: MacOS :: MacOS X",
+    "Operating System :: POSIX :: Linux",
+]
+requires-python = ">=3.9"
+dynamic = ["version"]
+
+[project.urls]
+Homepage = "https://github.com/adobe-type-tools/pyots"
+
+[tool.setuptools]
+package-dir = {"" = "src"}
+zip-safe = false
+
+[tool.setuptools.packages.find]
+where = ["src"]
+
+[tool.setuptools_scm]
 
 [tool.pytest.ini_options]
 testpaths = [
diff --git a/setup.py b/setup.py
index dd9a9ab..abde01f 100644
--- a/setup.py
+++ b/setup.py
@@ -1,10 +1,10 @@
-from build import SRC_DIR, OTS_SRC_DIR
 from distutils.dir_util import mkpath, remove_tree
 from distutils import log
 import io
 import os
 import re
-from setuptools import setup, find_packages, Extension, Command
+from pathlib import Path
+from setuptools import setup, Extension, Command
 from setuptools.command import build_py
 from setuptools.command.egg_info import egg_info
 import subprocess
@@ -12,6 +12,15 @@
 
 PY = sys.executable
 
+# Define paths (previously imported from build.py)
+try:
+    ROOT = Path(__file__).parent.resolve()
+except NameError:
+    # Fallback for when __file__ is not defined
+    ROOT = Path.cwd()
+SRC_DIR = ROOT / "src"
+OTS_SRC_DIR = SRC_DIR / "ots"
+
 BUILD_DIR = OTS_SRC_DIR / "build" / "meson"
 BUILD_SUB_DIR = BUILD_DIR / "subprojects"
 SRC_SUB_DIR = OTS_SRC_DIR / "subprojects"
@@ -47,7 +56,7 @@ def _get_extra_objects():
     # xo.append(BUILD_SUB_DIR / f"woff2-{WOFF2_TAG}" / "libwoff2_decoder.a")
     # xo.append(BUILD_SUB_DIR / f"woff2-{WOFF2_TAG}" / "libwoff2_common.a")
 
-    return [str(p) for p in xo]
+    return [str(p.relative_to(ROOT)) for p in xo]
 
 
 def _get_include_dirs():
@@ -69,7 +78,7 @@ def _get_include_dirs():
     # woff2
     ip.append(SRC_SUB_DIR / f"woff2-{WOFF2_TAG}" / "include")
 
-    return [str(p) for p in ip]
+    return [str(p.relative_to(ROOT)) for p in ip]
 
 
 def _get_sources():
@@ -87,7 +96,7 @@ def _get_sources():
     sp.append(SRC_SUB_DIR / f"woff2-{WOFF2_TAG}" / "src" / "woff2_dec.cc")
     sp.append(SRC_SUB_DIR / f"woff2-{WOFF2_TAG}" / "src" / "woff2_out.cc")
 
-    return [str(p) for p in sp]
+    return [str(p.relative_to(ROOT)) for p in sp]
 
 
 class BuildStaticLibs(Command):
@@ -271,37 +280,7 @@ def run(self):
     sources=_get_sources(),
 )
 
-with io.open("README.md", encoding="utf-8") as readme:
-    long_description = readme.read()
-
-classifiers = [
-    'Development Status :: 4 - Beta',
-    'Intended Audience :: Developers',
-    'Topic :: Software Development :: Testing',
-    'License :: OSI Approved :: BSD License',
-    'Programming Language :: Python :: 3.9',
-    'Programming Language :: Python :: 3.10',
-    'Programming Language :: Python :: 3.11',
-    'Programming Language :: Python :: 3.12',
-    'Operating System :: MacOS :: MacOS X',
-    'Operating System :: POSIX :: Linux',
-]
-
 setup(
-    author='Adobe Type team & friends',
-    author_email='afdko@adobe.com',
     cmdclass=custom_commands,
-    classifiers=classifiers,
-    description='Python wrapper for ot-sanitizer',
     ext_modules=[pyots_mod],
-    long_description_content_type='text/markdown',
-    long_description=long_description,
-    name='pyots',
-    packages=find_packages('src'),
-    package_dir={'': 'src'},
-    python_requires='>=3.9',
-    url='https://github.com/adobe-type-tools/pyots',
-    use_scm_version=True,
-    setup_requires=['setuptools_scm'],
-    zip_safe=False,
 )