diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index 5ab4f0564..637a229b5 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -3,7 +3,7 @@ current_version = 0.2.2
 commit = True
 tag = True
 
-[bumpversion:file:./setup.py]
+[bumpversion:file:pyproject.toml]
 
 [bumpversion:file:./docs/conf.py]
 
diff --git a/.github/workflows/pages.yml b/.github/workflows/pages.yml
index 920b44b49..c181b4b57 100644
--- a/.github/workflows/pages.yml
+++ b/.github/workflows/pages.yml
@@ -27,18 +27,14 @@ jobs:
       - name: Installing the library
         shell: bash -l {0}
         run: |
-          mkdir -p $HOME/.tidy3d
-          echo ${{ secrets.TIDY3D_AUTH }}  > $HOME/.tidy3d/auth.json
-          pip install -e .
-          sudo wget https://github.com/jgm/pandoc/releases/download/1.16.0.2/pandoc-1.16.0.2-1-amd64.deb
-          sudo dpkg -i pandoc-1.16.0.2-1-amd64.deb
-          #sudo apt install pandoc
-          pip install -r requirements_dev.txt
+          sudo apt install pandoc
+          pip install -e .[docs]
       - name: Running the Sphinx to gh-pages Action
         uses: uibcdf/action-sphinx-docs-to-gh-pages@v1.0-beta.2
         env:
           TIDY3D_USER: ${{ secrets.TIDY3D_EMAIL }}
           TIDY3D_PASS: ${{ secrets.TIDY3D_PASSWORD }}
+          DISPLAY: 1.0
         with:
           branch: main
           dir_docs: docs
diff --git a/.github/workflows/pre-commit.yml b/.github/workflows/pre-commit.yml
deleted file mode 100644
index 38940972d..000000000
--- a/.github/workflows/pre-commit.yml
+++ /dev/null
@@ -1,16 +0,0 @@
-name: pre-commit
-
-on:
-  pull_request:
-  push:
-
-jobs:
-  pre-commit:
-    runs-on: ubuntu-latest
-    concurrency:
-      group: ${{ github.ref }}-pre-commit
-      cancel-in-progress: true
-    steps:
-    - uses: actions/checkout@v3
-    - uses: actions/setup-python@v3
-    - uses: pre-commit/action@v3.0.0
diff --git a/.github/workflows/pythonpublish.yml b/.github/workflows/release.yml
similarity index 64%
rename from .github/workflows/pythonpublish.yml
rename to .github/workflows/release.yml
index 7d27a356c..fef6fe744 100644
--- a/.github/workflows/pythonpublish.yml
+++ b/.github/workflows/release.yml
@@ -1,21 +1,20 @@
-name: Upload Python Package
+name: Release PyPI
 
 on:
-  release:
-    types: [created, published]
   push:
-    branches: [master]
-    tags: [v*]
+    tags: "v*"
 
 jobs:
-  deploy:
+  release_pypi:
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v4
         with:
-          python-version: "3.x"
+          python-version: 3.x
+          cache-dependency-path: pyproject.toml
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
@@ -25,5 +24,5 @@ jobs:
           TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
           TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
         run: |
-          python setup.py sdist bdist_wheel
+          make build
           twine upload dist/*
diff --git a/.github/workflows/test_code.yml b/.github/workflows/test_code.yml
index ed34d8849..e32331f77 100644
--- a/.github/workflows/test_code.yml
+++ b/.github/workflows/test_code.yml
@@ -1,35 +1,124 @@
----
-name: Lint and Test
-# https://docs.github.com/en/free-pro-team@latest/actions/guides/building-and-testing-python
+name: Test pre-commit, code and docs
 
 on:
   pull_request:
   push:
+    branches:
+      - main
 
 jobs:
-  build:
+  pre-commit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+      - uses: pre-commit/action@v3.0.0
+  test_code:
+    needs: [pre-commit]
     runs-on: ${{ matrix.os }}
     strategy:
       max-parallel: 12
       matrix:
-        python-version: [3.7, '3.10']
-        os: [ubuntu-latest]
+        python-version: ["3.10"]
+        os: [ubuntu-latest, windows-latest, macos-latest]
 
     steps:
-      - name: Cancel Workflow Action
-        uses: styfle/cancel-workflow-action@0.11.0
       - uses: actions/checkout@v3
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
+          cache: "pip"
+          cache-dependency-path: pyproject.toml
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip
-          pip install flake8 pytest pytest_regressions
           pip install .
+          pip install flake8 pytest pytest_regressions
       - name: Lint with flake8
         run: |
           flake8 .
       - name: Test with pytest
         run: pytest
+  test_code_coverage_python37:
+    runs-on: ubuntu-latest
+    needs: [pre-commit]
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3.9
+          cache: "pip"
+          cache-dependency-path: pyproject.toml
+      - name: Install dependencies
+        run: |
+          pip install -e .
+      - name: Test with pytest
+        run: |
+          python -m pip install --upgrade pip
+          pip install pytest klayout lytest scikit-image pytest-cov pytest_regressions
+          pytest --cov=sky130 tests/
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v3
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          fail_ci_if_error: true
+  test_docs:
+    needs: [pre-commit]
+    runs-on: ${{ matrix.os }}
+    strategy:
+      max-parallel: 12
+      matrix:
+        python-version: [3.9]
+        os: [ubuntu-latest]
+
+    steps:
+      - uses: actions/checkout@v3
+      - uses: conda-incubator/setup-miniconda@v2
+        with:
+          python-version: 3.9
+          mamba-version: "*"
+          channels: conda-forge,defaults
+          channel-priority: true
+          activate-environment: anaconda-client-env
+      - name: Add conda to system path
+        run: |
+          echo $CONDA/bin >> $GITHUB_PATH
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          sudo apt install pandoc
+          pip install -e .[docs]
+      - name: Test documentation
+        env:
+          TIDY3D_USER: ${{ secrets.TIDY3D_EMAIL }}
+          TIDY3D_PASS: ${{ secrets.TIDY3D_PASSWORD }}
+          DISPLAY: 1.0
+        run: |
+          mkdir -p $HOME/.tidy3d
+          echo ${{ secrets.TIDY3D_AUTH }} > $HOME/.tidy3d/auth.json
+          cd docs
+          make html
+
+  release_pypi:
+    needs: [pre-commit]
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3.x
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install setuptools wheel twine
+      - name: Build and publish
+        env:
+          TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
+          TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
+        run: |
+          python setup.py sdist bdist_wheel
+          twine upload dist/*
diff --git a/.github/workflows/test_docs.yml b/.github/workflows/test_docs.yml
deleted file mode 100644
index c21257a31..000000000
--- a/.github/workflows/test_docs.yml
+++ /dev/null
@@ -1,27 +0,0 @@
-name: Test documentation
-
-on:
-  pull_request:
-  push:
-
-jobs:
-  build-linux:
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Cancel Workflow Action
-        uses: styfle/cancel-workflow-action@0.11.0
-      - uses: actions/checkout@v3
-      - name: Set up Python 3.9
-        uses: actions/setup-python@v3
-        with:
-          python-version: 3.9
-      - name: Install dependencies
-        run: |
-          pip install -r requirements_dev.txt
-          pip install .
-          sudo apt install pandoc
-      - name: Test documentation
-        run: |
-          cd docs
-          make html
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
deleted file mode 100644
index e72bd2a5f..000000000
--- a/.gitlab-ci.yml
+++ /dev/null
@@ -1,71 +0,0 @@
-image: python:3.7
-
-before_script:
-  - pip list
-  - python -V # Print out python version for debugging
-  - which python # Print out which python for debugging
-  - pip install -r requirements.txt --upgrade
-  - python setup.py develop
-
-stages:
-  - test
-  - release
-
-pre-commit:
-  stage: test
-  script:
-    - pip install pre-commit
-    - pre-commit install
-    - pre-commit run -a
-
-test:
-  stage: test
-  script:
-    - pytest
-
-python37:
-  image: python:3.7
-  stage: test
-  script:
-    - python -m pip install tox
-    - python -m tox -e py37
-
-python38:
-  image: python:3.8
-  stage: test
-  script:
-    - python -m pip install tox
-    - python -m tox -e py38
-
-python39:
-  image: python:3.9
-  stage: test
-  script:
-    - python -m pip install tox
-    - python -m tox -e py39
-
-doctest:
-  stage: test
-  script:
-    - python -m pip install tox
-    - python -m tox -e docs
-
-flake8:
-  stage: test
-  script:
-    - python -m pip install tox
-    - python -m tox -e flake8
-
-mypy:
-  stage: test
-  script:
-    - python -m pip install tox
-    - python -m tox -e mypy
-
-docs:
-  stage: release
-  script:
-    - cd docs
-    - make install clean html upload
-  only:
-    - release
diff --git a/.isort.cfg b/.isort.cfg
deleted file mode 100644
index da00084db..000000000
--- a/.isort.cfg
+++ /dev/null
@@ -1,5 +0,0 @@
-[settings]
-line_length = 88
-multi_line_output = 3
-include_trailing_comma = True
-known_third_party = celery,django,environ,pyquery,pytz,redis,requests,rest_framework
diff --git a/.mergify.yml b/.mergify.yml
deleted file mode 100644
index a41d6856d..000000000
--- a/.mergify.yml
+++ /dev/null
@@ -1,8 +0,0 @@
-pull_request_rules:
-  - name: automatic merge for Dependabot pull requests
-    conditions:
-      - author~=^dependabot(|-preview)\[bot\]$
-      - check-success=Travis CI - Pull Request
-    actions:
-      merge:
-        method: merge
diff --git a/.readthedocs.yml b/.readthedocs.yml
deleted file mode 100644
index ba02e14ca..000000000
--- a/.readthedocs.yml
+++ /dev/null
@@ -1,24 +0,0 @@
-# .readthedocs.yml
-# Read the Docs configuration file
-# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
-
-# Required
-version: 2
-
-# Build documentation in the docs/ directory with Sphinx
-sphinx:
-  configuration: docs/conf.py
-
-# Build documentation with MkDocs
-#mkdocs:
-#  configuration: mkdocs.yml
-
-# Optionally build your docs in additional formats such as PDF and ePub
-# formats: all
-
-# Optionally set the version of Python and requirements required to build your docs
-python:
-   version: 3.9
-   install:
-      - requirements: requirements.txt
-      - requirements: requirements_dev.txt
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 4e4004d68..000000000
--- a/.travis.yml
+++ /dev/null
@@ -1,14 +0,0 @@
-language: python
-python:
-  - "3.7"
-
-# install dependencies
-install:
-  - pip install -r requirements.txt
-
-# run tests
-script:
-  - pytest
-
-notifications:
-  email: false
diff --git a/MANIFEST.in b/MANIFEST.in
deleted file mode 100644
index cdbd159a3..000000000
--- a/MANIFEST.in
+++ /dev/null
@@ -1,19 +0,0 @@
-include requirements.txt
-include README.md
-include LICENSE
-include sky130/klayout/sky130/sky130.xs
-include sky130/klayout/sky130/sky130.lyp
-include sky130/klayout/sky130/sky130_xs.lyp
-include sky130/klayout/sky130/sky130hd.lyt
-include sky130/klayout/sky130/tech.lyt
-include sky130/klayout/sky130/layers.lyp
-recursive-include sky130/gds *.gds
-recursive-include sky130/spice *.spice
-global-include *.lyp
-global-include *.lym
-global-include *.lyt
-global-include *.spice
-global-include *.xs
-include requirements.txt
-include requirements_dev.txt
-include sky130/gds/*.gds
diff --git a/Makefile b/Makefile
index 72e8609b8..7dd421b56 100644
--- a/Makefile
+++ b/Makefile
@@ -1,8 +1,5 @@
-
 install:
-	pip install -r requirements.txt --upgrade
-	pip install -r requirements_dev.txt --upgrade
-	pip install -e .
+	pip install -e . pre-commit
 	pre-commit install
 
 watch:
@@ -39,12 +36,20 @@ update:
 update-pre:
 	pre-commit autoupdate --bleeding-edge
 
+git-rm-merged:
+	git branch -D `git branch --merged | grep -v \* | xargs`
+
 release:
 	git push
 	git push --tags
 
 build:
-	python setup.py sdist bdist_wheel
+	rm -rf dist
+	pip install build
+	python -m build
 
 tech:
 	python3 install_tech.py
+
+
+.PHONY: gdsdiff build conda
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 000000000..19ceddf69
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,149 @@
+# https://setuptools.pypa.io/en/latest/userguide/pyproject_config.html
+[build-system]
+requires = ["flit_core >=3.2,<4"]
+build-backend = "flit_core.buildapi"
+
+[project]
+name="sky130"
+description="skywater130 pdk"
+classifiers = [
+    "License :: OSI Approved :: MIT License",
+	"Programming Language :: Python :: 3.7",
+	"Programming Language :: Python :: 3.8",
+	"Programming Language :: Python :: 3.9",
+	"Programming Language :: Python :: 3.10",
+	"Programming Language :: Python :: 3.11",
+	"Operating System :: OS Independent",
+]
+version="0.2.2"
+authors = [
+    {name = "gdsfactory", email = "contact@gdsfactory.com"},
+]
+keywords = ["python"]
+license = {file = "LICENSE"}
+dependencies = [
+    "gdsfactory[full]==6.16.2",
+    "PySpice"
+]
+readme = "README.md"
+requires-python = ">=3.7"
+
+[project.optional-dependencies]
+dev = [
+    "autotyping",
+    "black>=21",
+    "doc8",
+    "mypy",
+    "pre-commit",
+    "pylsp-mypy",
+    "types-cachetools",
+    "flake8",
+    "flake8-bugbear",
+    "ipykernel",
+    "pytest",
+    "pytest-cov",
+    "pytest_regressions",
+    "types-PyYAML",
+    "xdoctest",
+    "pyproject-flake8",
+    ]
+docs = [
+    "autodoc_pydantic",
+    "docutils==0.17.1",
+    "matplotlib",
+    "myst-parser",
+    "nbsphinx",
+    "sphinx",
+    "sphinx-autodoc-typehints",
+    "sphinx-book-theme==0.3.3",
+    "sphinx-click",
+    "sphinx-copybutton",
+    "sphinx-markdown-tables==0.0.16",
+    "sphinxcontrib-video",
+    ]
+
+
+[tool.setuptools.packages]
+find = {}
+
+[tool.black]
+line-length = 88
+target-version = ['py310']
+include = '\.pyi?$'
+exclude = '''  # Specify the files/dirs that should be ignored by the black formatter
+/(
+    \.eggs
+  | \.git
+  | \.hg
+  | \.mypy_cache
+  | \.tox
+  | \.venv
+  | env
+  | _build
+  | buck-out
+  | build
+  | dist
+)/
+'''
+
+[tool.pytest.ini_options]
+testpaths = ["sky130", "tests"]
+# addopts = --tb=no
+# addopts = '--tb=short'
+python_files = ["sky130/*.py", "tests/*.py"]
+# python_files = ["tests/*.py"]
+# norecursedirs = ["extra/*.py", 'sky130/simulations/*.py']
+# addopts = '--cov=tests --cov-report html'
+
+[tool.flake8]
+max-line-length = 88
+max-complexity = 57
+select = ["B","C","E","F","W","T4","B9"]
+ignore = [ "E501", "E503", "E722", "W503", "W503", "E203", "B950", "B305", "B018", "B902", "B020", "B905"]
+extend-ignore = "RST303"
+
+exclude = [
+    ".git",
+    "__pycache__",
+    "lib",
+    "docs/source/conf.py",
+    "build",
+    "dist",
+    ".ipynb_checkpoints",
+    ".tox",
+    "extra",
+    "deprecated",
+    ".mypy_cache",
+    "venv",
+    "devsim",
+    ]
+
+[tool.commitizen]
+name = "cz_conventional_commits"
+version = "0.1.0"
+version_files = [
+    "pyproject.toml:version",
+]
+
+[tool.mypy]
+python_version = "3.10"
+strict = true
+
+[tool.pylsp-mypy]
+enabled = true
+live_mode = true
+strict = true
+
+[tool.isort]
+multi_line_output = 3
+line_length = 88
+include_trailing_comma = true
+
+[tool.setuptools.package-data]
+mypkg = ["*.csv", "*.yaml"]
+
+[tool.pydocstyle]
+inherit = false
+match = "(?!test).*\\.py"
+add-ignore = ["D100","D101","D102","D103","D104","D203","D405","D417"]
+convention = "google"
diff --git a/pytest.ini b/pytest.ini
deleted file mode 100644
index 3116f2af7..000000000
--- a/pytest.ini
+++ /dev/null
@@ -1,11 +0,0 @@
-[pytest]
-testpaths = sky130 tests
-# addopts = --tb=no
-addopts = '--tb=short'
-python_files = sky130/*.py tests/*.py
-
-filterwarnings =
-    ignore::UserWarning
-    ignore::DeprecationWarning
-
-# addopts = '--html=test_report.html' '--self-contained-html'
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index c33296105..000000000
--- a/requirements.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-gdsfactory[full]==6.15.3
-PySpice
diff --git a/requirements_dev.txt b/requirements_dev.txt
deleted file mode 100644
index 716ac4e7e..000000000
--- a/requirements_dev.txt
+++ /dev/null
@@ -1,25 +0,0 @@
-autodoc_pydantic
-autotyping
-doc8
-docutils==0.17.1
-flake8
-flake8-bugbear
-gdsfactory[full]
-ipykernel
-mypy
-myst-parser
-nbsphinx
-pre-commit
-pur
-pydocstyle
-pytest
-pytest-cov
-pytest-regressions
-sphinx-autodoc-typehints
-sphinx-book-theme==0.3.3
-sphinx-click
-sphinx-copybutton
-sphinx-markdown-tables==0.0.16
-types-PyYAML
-types-waitress
-xdoctest
diff --git a/setup.cfg b/setup.cfg
deleted file mode 100644
index 0ac626881..000000000
--- a/setup.cfg
+++ /dev/null
@@ -1,27 +0,0 @@
-[flake8]
-max-line-length = 88
-max-complexity = 38
-select = B,C,E,F,W,T4,B9
-ignore = E501, E503, E722, W503, W503, E203, B950
-
-extend-ignore =
-    RST303
-
-exclude =
-    .git,
-    __pycache__,
-    docs/source/conf.py,
-    build,
-    dist,
-    .ipynb_checkpoints,
-    .tox,
-    extra,
-    deprecated,
-    gdslib,
-    .tox,
-    .mypy_cache
-
-[pydocstyle]
-inherit = false
-ignore = D100,D203,D405
-match = .*\.py
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 59954a09a..000000000
--- a/setup.py
+++ /dev/null
@@ -1,34 +0,0 @@
-from setuptools import find_packages
-from setuptools import setup
-
-
-def get_install_requires():
-    with open("requirements.txt") as f:
-        return [line.strip() for line in f.readlines() if not line.startswith("-")]
-
-
-with open("README.md") as f:
-    LONG_DESCRIPTION = f.read()
-
-
-setup(
-    name="sky130",
-    version="0.2.2",
-    url="https://github.com/gdsfactory/skywater130",
-    include_package_data=True,
-    license="MIT",
-    author="gdsfactory",
-    description="skywater gdsfactory pdk",
-    long_description=LONG_DESCRIPTION,
-    long_description_content_type="text/markdown",
-    packages=find_packages(exclude=("tests",)),
-    # install_requires=("gdsfactory==5.8.8",),
-    install_requires=get_install_requires(),
-    python_requires=">=3.7",
-    classifiers=[
-        "Development Status :: 2 - Pre-Alpha",
-        "License :: OSI Approved :: MIT License",
-        "Programming Language :: Python",
-        "Programming Language :: Python :: 3.7",
-    ],
-)
diff --git a/tox.ini b/tox.ini
deleted file mode 100644
index 8c8086305..000000000
--- a/tox.ini
+++ /dev/null
@@ -1,57 +0,0 @@
-[tox]
-envlist = py37, py38, py39
-
-
-[testenv]
-commands = pytest
-deps=
-    pytest
-    -rrequirements.txt
-    -rrequirements_dev.txt
-
-# Linters
-[testenv:flake8]
-basepython = python3
-skip_install = true
-deps =
-    flake8
-    flake8-bugbear
-    flake8-docstrings>=1.3.1
-    flake8-import-order>=0.9
-    flake8-typing-imports>=1.1
-    pep8-naming
-commands =
-    flake8
-
-
-# Flake8 Configuration
-[flake8]
-ignore = D203, W503, E203, B950
-exclude =
-    .tox,
-    .git,
-    __pycache__,
-    docs/source/conf.py,
-    build,
-    dist,
-    tests/fixtures/*,
-    *.pyc,
-    *.egg-info,
-    .cache,
-    .eggs
-max-complexity = 10
-import-order-style = google
-application-import-names = flake8
-
-
-[testenv:docs]
-commands =
-    py.test --doctest-glob="*.md" --doctest-glob="README.md" README.md
-
-
-[testenv:mypy]
-skip_install = True
-deps =
-    mypy
-commands=
-	mypy . ignore-missing-imports --pretty