diff --git a/.flake8 b/.flake8
new file mode 100644
index 000000000..4da080b2c
--- /dev/null
+++ b/.flake8
@@ -0,0 +1,16 @@
+[flake8]
+# https://pep8.readthedocs.io/en/latest/intro.html#error-codes
+ignore =
+    # line break after operator
+    W504
+# Max width of Github code review is 79 characters
+max-line-length = 79
+max-complexity = 18
+per-file-ignores =
+    */__init__.py: F401
+exclude =
+    .git,
+    docs,
+    .idea,
+    .mypy_cache,
+    .pytest_cache,
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 4e52531a9..b9fb5531e 100755
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -30,7 +30,7 @@ repos:
     rev: 7.1.1
     hooks:
       - id: flake8
-        args: ["--config=setup.cfg"]
+        args: ["--config=.flake8"]
         additional_dependencies: [flake8-isort]
 
   # Can run individually with `pre-commit run mypy --all-files`
@@ -38,7 +38,7 @@ repos:
     rev: v1.11.2
     hooks:
       - id: mypy
-        args: ["--config=setup.cfg", "--show-error-codes"]
+        args: ["--config=pyproject.toml", "--show-error-codes"]
         verbose: true
         additional_dependencies: ['types-requests']
 
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 000000000..bef85afa2
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,77 @@
+[project]
+name = "polaris"
+dynamic = ["version"]
+authors = [
+    { name="Xylar Asay-Davis", email="xylar@lanl.gov" },
+    { name="Althea Denlinger", email="althea@lanl.gov" }
+]
+description = "Testing and analysis for Omega, MPAS-Ocean, MALI and MPAS-Seaice"
+license = {file = "LICENSE"}
+readme = "README.md"
+requires-python = ">=3.9"
+classifiers = [
+    # these are only for searching/browsing projects on PyPI
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+
+    "License :: OSI Approved :: BSD License",
+    "Operating System :: OS Independent",
+]
+
+dependencies = [
+    "cartopy",
+    "cmocean",
+    "importlib_resources",
+    "ipython",
+    "jigsawpy",
+    "jupyter",
+    "lxml",
+    "matplotlib>=3.9.0",
+    "netcdf4",
+    "numpy>=2.0,<3.0",
+    "progressbar2",
+    "pyamg>=4.2.2",
+    "pyproj",
+    "ruamel.yaml",
+    "requests",
+    "scipy>=1.8.0",
+    "shapely>=2.0,<3.0",
+    "xarray",
+]
+
+[tool.isort]
+multi_line_output = "3"
+include_trailing_comma = true
+force_grid_wrap = "0"
+use_parentheses = true
+line_length = "79"
+skip = ["e3sm_diags/e3sm_diags_driver.py"]
+
+[tool.mypy]
+python_version = "3.10"
+check_untyped_defs = true
+ignore_missing_imports = true
+warn_unused_ignores = true
+warn_redundant_casts = true
+warn_unused_configs = true
+
+[build-system]
+requires = ["setuptools>=60"]
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools.packages.find]
+exclude = ["docs*", "conda*"]
+
+[tool.setuptools.dynamic]
+version = { attr = "polaris.version.__version__" }
+
+# evolution of options.entry-points
+[project.scripts]
+polaris = "polaris.__main__:main"
+mpas_to_yaml = "polaris.yaml:main_mpas_to_yaml"
+
+[project.urls]
+Documentation = "https://docs.e3sm.org/polaris"
+"Bug Tracker" = "https://github.com/E3SM-Project/polaris/issues"
diff --git a/setup.cfg b/setup.cfg
deleted file mode 100644
index 3cddead30..000000000
--- a/setup.cfg
+++ /dev/null
@@ -1,92 +0,0 @@
-[metadata]
-name = polaris
-version = attr: polaris.version.__version__
-author = E3SM Development Team
-author_email = xylar@lanl.gov
-description = Testing and analysis for Omega, MPAS-Ocean, MALI and MPAS-Seaice
-long_description = file: README.md
-long_description_content_type = text/markdown
-url = https://github.com/E3SM-Project/polaris
-project_urls =
-    Bug Tracker = https://github.com/E3SM-Project/polaris/issues
-classifiers =
-    Programming Language :: Python
-    Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.9
-    Programming Language :: Python :: 3.10
-    Programming Language :: Python :: 3.11
-    Programming Language :: Python :: 3.12
-    License :: OSI Approved :: BSD License
-    Operating System :: OS Independent
-
-[options]
-packages = find:
-include_package_data = True
-python_requires = >=3.9,<=3.12
-install_requires =
-    cartopy
-    cmocean
-    importlib_resources
-    ipython
-    jigsawpy
-    jupyter
-    lxml
-    matplotlib>=3.9.0
-    netcdf4
-    numpy>=2.0,<3.0
-    progressbar2
-    pyamg>=4.2.2
-    pyproj
-    ruamel.yaml
-    requests
-    scipy>=1.8.0
-    shapely>=2.0,<3.0
-    xarray
-
-[options.entry_points]
-console_scripts =
-    polaris = polaris.__main__:main
-    mpas_to_yaml = polaris.yaml:main_mpas_to_yaml
-
-[flake8]
-# https://pep8.readthedocs.io/en/latest/intro.html#error-codes
-ignore =
-    # line break after operator
-    W504
-# Max width of Github code review is 79 characters
-max-line-length = 79
-max-complexity = 18
-per-file-ignores =
-    */__init__.py: F401
-exclude =
-    .git,
-    docs,
-    .idea,
-    .mypy_cache,
-    .pytest_cache,
-
-[isort]
-multi_line_output=3
-include_trailing_comma=True
-force_grid_wrap=0
-use_parentheses=True
-line_length=79
-skip=
-    e3sm_diags/e3sm_diags_driver.py
-
-[pycodestyle]
-max-line-length = 79
-exclude =
-    .git
-    docs
-    .idea
-    .mypy_cache
-    .pytest_cache
-
-[mypy]
-python_version = 3.10
-check_untyped_defs = True
-ignore_missing_imports = True
-warn_unused_ignores = True
-warn_redundant_casts = True
-warn_unused_configs = True
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 7f1a1763c..000000000
--- a/setup.py
+++ /dev/null
@@ -1,4 +0,0 @@
-from setuptools import setup
-
-if __name__ == "__main__":
-    setup()