diff --git a/.coveragerc b/.coveragerc
deleted file mode 100644
index 9ff8d58..0000000
--- a/.coveragerc
+++ /dev/null
@@ -1,2 +0,0 @@
-[run]
-omit = ./doc/*
diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index 32e0996..8644027 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -1,7 +1,7 @@
 # This workflow will install Python dependencies, run tests and lint with a variety of Python versions
 # For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
 
-name: Python package
+name: CI
 
 on:
   push:
@@ -10,34 +10,123 @@ on:
     branches: [ master, dev, v0.7]
 
 jobs:
-  build:
+  check:
+    name: ${{ matrix.env.name }}
+    runs-on: ubuntu-22.04
+    strategy:
+      fail-fast: false
+      matrix:
+        env:
+          - {"name": "pkg", "target": "show"}
+          - {"name": "lint", "target": "run"}
+          # - {"name": "type", "target": "run"}
+          - {"name": "docs", "target": "all"}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.x"
+      - name: Let us have colors
+        run: echo "FORCE_COLOR=true" >> "$GITHUB_ENV"
+      - name: Install Hatch
+        uses: pypa/hatch@install
+      - name: Setup ${{ matrix.env.name }}
+        run: |
+          hatch -v env create ${{ matrix.env.name }}
+          hatch run ${{ matrix.env.name }}:pip freeze
+      - name: Run ${{ matrix.env.name }}
+        run: hatch -v run ${{ matrix.env.name }}:${{ matrix.env.target }}
 
+  test:
+    name: test py${{ matrix.python-version }} - seaborn-${{ matrix.seaborn-version }}
     runs-on: ubuntu-22.04
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.8, 3.9, '3.10', 3.11, 3.12]
+        # keep synchronized with hatch tests matrix
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        seaborn-version: ["0.11", "0.12", "0.13"]
 
     steps:
-    - uses: actions/checkout@v4
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v5
-      with:
-        python-version: ${{ matrix.python-version }}
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        python -m pip install flake8 coverage packaging
-        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
-    - name: Lint with flake8
-      run: |
-        # stop the build if there are Python syntax errors or undefined names
-        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
-        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
-    - name: Test with unittest
-      run: |
-        coverage run -m unittest discover tests
-        coverage report -m
-    - name: Upload Coverage to Codecov
-      uses: codecov/codecov-action@v4
+      - name: Setup python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.x"
+      - name: Pick environment to run
+        run: |
+          import codecs
+          import os
+          env = "tests.py{}-{}".format("${{ matrix.python-version }}", "${{ matrix.seaborn-version }}")
+          print(f"Environment {env}")
+          with codecs.open(os.environ["GITHUB_ENV"], mode="a", encoding="utf-8") as file_handler:
+              file_handler.write("FORCE_COLOR=1\n")
+              file_handler.write(f"ENV={env}\n")
+        shell: python
+      - name: Install Hatch
+        uses: pypa/hatch@install
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Setup python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Setup test environment
+        run: |
+          hatch -v env create ${ENV}
+          hatch run ${ENV}:pip freeze
+        shell: bash
+      - name: Run test suite
+        run: hatch -v run ${ENV}:run-cov
+        env:
+          CI_RUN: "yes"
+        shell: bash
+      - name: Upload coverage data
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-${{ matrix.python-version }}-${{ matrix.seaborn-version }}
+          path: "report/.coverage.*"
+
+  coverage:
+    name: coverage
+    runs-on: ubuntu-22.04
+    needs: test
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.x"
+      - name: Let us have colors
+        run: echo "FORCE_COLOR=true" >> "$GITHUB_ENV"
+      - name: Install Hatch
+        uses: pypa/hatch@install
+      - name: Setup coverage tool
+        run: |
+          hatch -v env create coverage
+          hatch run coverage:pip freeze
+      - name: Download coverage data
+        uses: actions/download-artifact@v4
+        with:
+          pattern: coverage-*
+          path: report
+          merge-multiple: true
+      - name: Combine and report coverage
+        run: hatch run coverage:run
+
+      - name: Upload HTML report
+        uses: actions/upload-artifact@v4
+        with:
+          name: html-report
+          path: report/html
+
+      - name: Upload Coverage to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+          directory: report
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
diff --git a/.gitignore b/.gitignore
index 32de0af..524db39 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,5 +10,8 @@ statannot.egg-info/requires.txt
 statannot.egg-info/SOURCES.txt
 statannot.egg-info/top_level.txt
 
+usage/figures/*
+report/
+
 # IDE files
 .idea/
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..d99bbae
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,19 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.3.0
+    hooks:
+      - id: check-yaml
+      # - id: end-of-file-fixer
+      # - id: trailing-whitespace
+  - repo: https://github.com/abravalheri/validate-pyproject
+    rev: v0.18
+    hooks:
+      - id: validate-pyproject
+#   - repo: https://github.com/astral-sh/ruff-pre-commit
+#     rev: v0.5.5
+#     hooks:
+#       # Run the linter.
+#       - id: ruff
+#         args: [ --fix, --unsafe-fixes ]
+#       # Run the formatter.
+#       - id: ruff-format
diff --git a/MANIFEST.in b/MANIFEST.in
deleted file mode 100644
index a7da3fc..0000000
--- a/MANIFEST.in
+++ /dev/null
@@ -1,2 +0,0 @@
-include requirements.txt
-include LICENSE
diff --git a/coverage.sh b/coverage.sh
deleted file mode 100755
index c1419ac..0000000
--- a/coverage.sh
+++ /dev/null
@@ -1 +0,0 @@
-coverage run -m unittest discover tests && coverage report && coverage-badge -f -o coverage.svg
\ No newline at end of file
diff --git a/docs/source/_static/.gitignore b/docs/source/_static/.gitignore
new file mode 100644
index 0000000..f935021
--- /dev/null
+++ b/docs/source/_static/.gitignore
@@ -0,0 +1 @@
+!.gitignore
diff --git a/docs/source/conf.py b/docs/source/conf.py
index d423ab2..9e4921f 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -33,7 +33,12 @@
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
-extensions = ['sphinx.ext.autodoc', 'sphinx.ext.coverage', 'sphinx_rtd_theme']
+extensions = [
+    'sphinx.ext.autodoc',
+    'sphinx.ext.coverage',
+    'sphinx.ext.doctest',
+    'sphinx_rtd_theme',
+]
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
diff --git a/docs/source/setup.rst b/docs/source/setup.rst
deleted file mode 100644
index 552eb49..0000000
--- a/docs/source/setup.rst
+++ /dev/null
@@ -1,7 +0,0 @@
-setup module
-============
-
-.. automodule:: setup
-   :members:
-   :undoc-members:
-   :show-inheritance:
diff --git a/hatch.toml b/hatch.toml
new file mode 100644
index 0000000..4509a14
--- /dev/null
+++ b/hatch.toml
@@ -0,0 +1,147 @@
+# https://hatch.pypa.io/latest/config/environment/overview/
+# ---------------------------------------------------------
+[envs.default]
+description = "Development environment"
+installer = "uv pip install"
+
+# ---------------------------------------------------------
+[envs.pkg]
+description = "package information"
+[envs.pkg.scripts]
+show = [
+  "uv pip list --format=columns",
+  'python -c "import sys; print(sys.version); print(sys.executable)"',
+]
+
+
+# ---------------------------------------------------------
+[envs.lint]
+template = "lint"
+installer = "uv pip install"
+description = "lint and format"
+detached = true
+dependencies = ["pre-commit"]
+
+[envs.lint.scripts]
+run = "pre-commit run --all-files"
+
+
+# ---------------------------------------------------------
+[envs.docs]
+template = "docs"
+installer = "uv pip install"
+description = "build and check documentation"
+features = ["docs"]
+
+[envs.docs.scripts]
+build = "sphinx-build -W --keep-going -b html docs/source docs/build"
+doctest = "sphinx-build -W --keep-going -b doctest docs/source docs/build"
+linkcheck = "sphinx-build -W --keep-going -b linkcheck docs/source docs/build"
+all = ["build", "doctest", "linkcheck"]
+
+
+# ---------------------------------------------------------
+[envs.types]
+template = "types"
+installer = "uv pip install"
+description = "Run the type checker"
+dev-mode = false
+dependencies = ["mypy"]
+
+[envs.types.scripts]
+run = [
+  """
+  mypy --install-types --non-interactive --ignore-missing-imports \
+    --config-file={root}/pyproject.toml {args:statannotations tests}
+  """,
+]
+
+
+# ---------------------------------------------------------
+[envs.tests]
+template = "tests"
+installer = "uv pip install"
+description = "Run the tests suite"
+features = ["tests"]
+extra-dependencies = [
+    "matplotlib<3.9",
+    "seaborn=={matrix:seaborn_version}",
+]
+
+[[envs.tests.matrix]]
+# python = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+# seaborn_version = ["0.11", "0.12", "0.13"]
+python = ["3.8", "3.9", "3.10", "3.11"]
+seaborn_version = ["0.11"]
+
+[envs.tests.overrides]
+matrix.seaborn_version.extra-dependencies = [
+    "matplotlib<3.9",
+    "seaborn=={matrix:seaborn_version}",
+    { value = "pandas<2", if = ["0.11", "0.12"]},
+    { value = "numpy<2", if = ["0.11", "0.12"]},
+]
+
+[envs.tests.env-vars]
+COVERAGE_FILE = "report/.coverage.{matrix:python}-{matrix:seaborn_version}"
+COVERAGE_PROCESS_START = "pyproject.toml"
+_COVERAGE_SRC = "statannotations"
+
+[envs.tests.scripts]
+run-cov = [
+  """
+  pytest --cov=statannotations \
+    --cov-config=pyproject.toml --cov-context=test \
+    --cov-report=term-missing:skip-covered \
+    --cov-report html:report/html{matrix:python} \
+    --cov-report xml:report/coverage{matrix:python}.xml \
+    {args:-n auto --slow}
+  """,
+]
+run = "pytest {args:-n auto}"
+
+
+# ---------------------------------------------------------
+[envs.coverage]
+template = "coverage"
+installer = "uv pip install"
+description = "combine coverage files"
+detached = true
+dependencies = [
+  "coverage[toml]>=7.3",
+]
+env-vars = { COVERAGE_FILE = "report/.coverage" }
+
+[envs.coverage.scripts]
+run = [
+  "- coverage combine --rcfile=pyproject.toml report",
+  "coverage report {args:--skip-covered --show-missing}",
+  "coverage xml -o report/coverage.xml",
+  "coverage html -d report/html",
+]
+
+
+# ---------------------------------------------------------
+[envs.examples]
+template = "examples"
+installer = "uv pip install"
+description = "Run the examples"
+python = "3.11"
+extra-dependencies = [
+    "matplotlib<3.9",
+    "seaborn=={matrix:seaborn_version}",
+]
+
+[[envs.examples.matrix]]
+seaborn_version = ["0.11", "0.12", "0.13"]
+
+[envs.examples.overrides]
+matrix.seaborn_version.extra-dependencies = [
+    "matplotlib<3.9",
+    "seaborn=={matrix:seaborn_version}",
+    { value = "pandas<2", if = ["0.11", "0.12"]},
+    { value = "numpy<2", if = ["0.11", "0.12"]},
+]
+
+[envs.examples.scripts]
+run = "- python usage/test_script.py {args}"
diff --git a/make_doc.sh b/make_doc.sh
deleted file mode 100755
index 2994014..0000000
--- a/make_doc.sh
+++ /dev/null
@@ -1,3 +0,0 @@
-cd docs &&
-# sphinx-apidoc -f -o source ../statannotations &&
-make html
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..448180c
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,103 @@
+# https://peps.python.org/pep-0517/
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+# https://peps.python.org/pep-0621/
+[project]
+name = "statannotations"
+description = "add statistical significance or custom annotations on seaborn plots. Based on statannot 0.2.3"
+readme = "README.md"
+license = {text = "MIT License"}
+requires-python = ">=3.7"
+maintainers = [
+    { name = "Florian Charlier", email = "trevis@cascliniques.be" },
+]
+classifiers = [
+    "License :: OSI Approved :: MIT License",
+    "Operating System :: OS Independent",
+    "Programming Language :: Python :: 3",
+    "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",
+    "Programming Language :: Python :: 3.12",
+]
+dynamic = ["version"]
+dependencies = [
+    "matplotlib>=2.2.2",
+    "numpy>=1.12.1",
+    "pandas>=0.23.0",
+    "scipy>=1.1.0",
+    "seaborn>=0.9.0",
+]
+
+[project.optional-dependencies]
+extra = ["statsmodels"]
+tests = [
+    "statannotations[extra]",
+    "pytest>=6",
+    "pytest-cov>=4.1",
+    "pytest-skip-slow",
+    "pytest-xdist",
+    "packaging",
+    # "coverage[toml]>=7.3",
+]
+docs = [
+    "sphinx",
+    "sphinx-rtd-theme",
+]
+dev = [
+    "ipython",
+]
+
+[project.urls]
+Homepage = "https://github.com/trevismd/statannotations"
+
+# https://hatch.pypa.io/latest/config/metadata/
+[tool.hatch.version]
+path = "statannotations/_version.py"
+
+[tool.hatch.build.targets.sdist]
+only-include = [
+    "/statannotations",
+    # "usage",
+    # "tests",
+    # "docs",
+]
+
+
+# https://docs.pytest.org/en/stable/reference/customize.html
+[tool.pytest.ini_options]
+minversion = "6.0"
+testpaths = ["tests"]
+addopts = "--import-mode=importlib"
+
+
+# https://coverage.readthedocs.io/en/latest/config.html
+[tool.coverage.report]
+exclude_also = [
+    "pragma: no.cover",
+    "if TYPE_CHECKING:",
+    "@overload",
+    "except ImportError",
+    "\\.\\.\\.",
+    "raise NotImplementedError()",
+    "if __name__ == .__main__.:",
+]
+show_missing = true
+skip_covered = false
+
+[tool.coverage.run]
+source = ["."]
+branch = true
+parallel = true
+# Cannot use, it results in 'no-data-collected'
+# relative_files = true
+
+[tool.coverage.paths]
+source = [
+  "statannotations",
+  "**/site-packages/statannotations",
+]
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index 31019d5..0000000
--- a/requirements.txt
+++ /dev/null
@@ -1,7 +0,0 @@
-numpy>=1.12.1
-seaborn>=0.9.0
-matplotlib>=2.2.2
-pandas>=0.23.0
-scipy>=1.1.0
-statsmodels
-packaging
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 58ac68e..0000000
--- a/setup.py
+++ /dev/null
@@ -1,41 +0,0 @@
-from setuptools import find_packages, setup
-import re
-
-with open("README.md", "r") as f:
-    long_description = f.read()
-
-VERSIONFILE = "statannotations/_version.py"
-verstrline = open(VERSIONFILE, "rt").read()
-match = re.search(r"^__version__ = ['\"]([^'\"]*)['\"]", verstrline, re.M)
-if match:
-    version = match.group(1)
-else:
-    raise RuntimeError("Unable to find version string in %s." % (VERSIONFILE,))
-
-
-def remove_dev_only(list_of_dependencies):
-    return [dep for dep in list_of_dependencies
-            if dep.strip() not in ("statsmodels", "packaging")]
-
-
-setup(
-    name="statannotations",
-    version=version,
-    maintainer="Florian Charlier",
-    maintainer_email="trevis@cascliniques.be",
-    description=("add statistical significance or custom annotations on "
-                 "seaborn plots. Based on statannot 0.2.3"),
-    license="MIT License",
-    license_file="LICENSE",
-    long_description=long_description,
-    long_description_content_type="text/markdown",
-    url="https://github.com/trevismd/statannotations",
-    packages=find_packages(exclude=("tests", "usage", "docs", "build", "dist")),
-    classifiers=[
-        "Programming Language :: Python :: 3",
-        "License :: OSI Approved :: MIT License",
-        "Operating System :: OS Independent",
-    ],
-    install_requires=remove_dev_only(open("requirements.txt").readlines()),
-    python_requires='>=3.6',
-)
diff --git a/usage/.png b/usage/.png
deleted file mode 100644
index 9bfb18e..0000000
Binary files a/usage/.png and /dev/null differ