diff --git a/.gitattributes b/.gitattributes
deleted file mode 100644
index 08da846..0000000
--- a/.gitattributes
+++ /dev/null
@@ -1 +0,0 @@
-bmi_tester/_version.py export-subst
diff --git a/.github/workflows/black.yml b/.github/workflows/black.yml
index 04351f7..1b42ee6 100644
--- a/.github/workflows/black.yml
+++ b/.github/workflows/black.yml
@@ -14,8 +14,8 @@ jobs:
 
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v4
       - uses: psf/black@stable
         with:
           args: ". --check"
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 9e38a8e..b132d55 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -34,12 +34,12 @@ jobs:
             shell: bash -l {0}
 
         steps:
-          - uses: actions/checkout@v2
+          - uses: actions/checkout@v4
 
           - uses: conda-incubator/setup-miniconda@v2
             with:
               auto-update-conda: true
-              python-version: ${{ matrix.python-version }}
+              python-version: "3.11"
               mamba-version: "*"
               channels: conda-forge,defaults
               channel-priority: true
@@ -47,7 +47,6 @@ jobs:
           - name: Install requirements
             run: |
               mamba install --file=requirements.txt --file=requirements-docs.txt
-              mamba install gimli.units
               mamba info
               mamba list
 
diff --git a/.github/workflows/flake8.yml b/.github/workflows/flake8.yml
index e52096f..22ad273 100644
--- a/.github/workflows/flake8.yml
+++ b/.github/workflows/flake8.yml
@@ -14,11 +14,10 @@ jobs:
 
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - name: Set up Python 3.8
-        uses: actions/setup-python@v2
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v4
         with:
-          python-version: 3.8
+          python-version: "3.11"
 
       - name: Lint
         run: |
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index d498abc..63c6d82 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -20,10 +20,10 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: [3.7, 3.8, 3.9]
+        python-version: ["3.9", "3.10", "3.11"]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - uses: conda-incubator/setup-miniconda@v2
         with:
@@ -41,7 +41,6 @@ jobs:
       - name: Install requirements
         run: |
           mamba install --file=requirements.txt --file=requirements-testing.txt
-          mamba install gimli.units
           mamba list
 
       - name: Build and install package
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 5193948..6ef1e3c 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -1,22 +1,17 @@
 version: 2
 
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.11"
+
 sphinx:
   builder: html
   configuration: docs/conf.py
   fail_on_warning: false
 
-formats:
-  - htmlzip
-
-conda:
-  environment: environment.yml
-
 python:
-  version: 3.8
   install:
+    - requirements: requirements-docs.txt
     - method: pip
       path: .
-  system_packages: false
-
-build:
-  image: latest
diff --git a/MANIFEST.in b/MANIFEST.in
index 2bbde2d..a7b5a51 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,4 +1,3 @@
-include LICENSE
 include *.rst
 include requirements*.txt
 include Makefile
diff --git a/Makefile b/Makefile
index d7a48b7..9e9154c 100644
--- a/Makefile
+++ b/Makefile
@@ -55,7 +55,7 @@ lint: ## check style with flake8
 
 pretty:
 	find bmi_tester -name '*.py' | xargs isort
-	black setup.py tests bmi_tester
+	black tests bmi_tester
 
 test: ## run tests quickly with the default Python
 	pytest
@@ -83,9 +83,8 @@ release: dist ## package and upload a release
 	twine upload dist/*
 
 dist: clean ## builds source and wheel package
-	python setup.py sdist
-	python setup.py bdist_wheel
+	python -m build
 	ls -l dist
 
 install: clean ## install the package to the active Python's site-packages
-	python setup.py develop
+	pip install -e .
diff --git a/README.rst b/README.rst
index 41bdca1..1aeba2f 100644
--- a/README.rst
+++ b/README.rst
@@ -58,7 +58,7 @@ From Source
 +++++++++++
 
 After downloading the *bmi-tester* source code, run the following from
-the project's top-level folder (the one that contains *setup.py*) to
+the project's top-level folder (the one that contains *pyproject.toml*) to
 install into the current environment,
 
 .. code:: bash
diff --git a/bmi_tester/tests/conftest.py b/bmi_tester/tests/conftest.py
index 895cb71..98979dd 100644
--- a/bmi_tester/tests/conftest.py
+++ b/bmi_tester/tests/conftest.py
@@ -159,7 +159,6 @@ def var_name(request):
 
 
 def pytest_generate_tests(metafunc):
-
     if "gid" in metafunc.fixturenames:
         metafunc.parametrize("gid", params["gid"])
     # elif "var_name" in metafunc.fixturenames:
diff --git a/docs/conf.py b/docs/conf.py
index 668c9a0..60e5df3 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -55,9 +55,9 @@
 master_doc = "index"
 
 # General information about the project.
-project = u"bmi_tester"
-copyright = u"2017, Eric Hutton"
-author = u"Eric Hutton"
+project = "bmi_tester"
+copyright = "2017, Eric Hutton"
+author = "Eric Hutton"
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
@@ -228,7 +228,7 @@
 # (source start file, target name, title,
 #  author, documentclass [howto, manual, or own class]).
 latex_documents = [
-    (master_doc, "bmi_tester.tex", u"bmi\\_tester Documentation", u"Author", "manual"),
+    (master_doc, "bmi_tester.tex", "bmi\\_tester Documentation", "Author", "manual"),
 ]
 
 # The name of an image file (relative to this directory) to place at the top of
@@ -256,7 +256,7 @@
 
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
-man_pages = [(master_doc, "bmi_tester", u"bmi_tester Documentation", [author], 1)]
+man_pages = [(master_doc, "bmi_tester", "bmi_tester Documentation", [author], 1)]
 
 # If true, show URL addresses after external links.
 # man_show_urls = False
@@ -271,7 +271,7 @@
     (
         master_doc,
         "bmi_tester",
-        u"bmi_tester Documentation",
+        "bmi_tester Documentation",
         author,
         "bmi_tester",
         "One line description of project.",
diff --git a/environment.yml b/environment.yml
index b67396e..0b81182 100644
--- a/environment.yml
+++ b/environment.yml
@@ -2,7 +2,6 @@ name: bmi-tester
 channels:
   - conda-forge
 dependencies:
-- gimli.units
 - pip
 - pip:
   - -r file:requirements.txt
diff --git a/pyproject.toml b/pyproject.toml
index 91c2e97..c5442a7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,12 +1,90 @@
 [build-system]
-requires = ["cython", "numpy", "setuptools", "wheel"]
+requires = ["setuptools", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "bmi-tester"
+description = "Test Python BMI bindings"
+version = "0.5.6.dev0"
+authors = [
+  {email = "eric.hutton@colorado.edu"},
+  {name = "Eric Hutton"},
+]
+maintainers = [
+  {email = "eric.hutton@colorado.edu"},
+  {name = "Eric Hutton"},
+  {email = "mark.piper@colorado.edu"},
+  {name = "Mark Piper"}
+]
+keywords = [
+  "bmi",
+  "csdms",
+  "model",
+  "python",
+]
+license = {file = "LICENSE"}
+classifiers = [
+  "Development Status :: 4 - Beta",
+  "Intended Audience :: Science/Research",
+  "License :: OSI Approved :: MIT License",
+  "Operating System :: OS Independent",
+  "Programming Language :: Python :: 3.9",
+  "Programming Language :: Python :: 3.10",
+  "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3",
+  "Topic :: Scientific/Engineering :: Physics",
+]
+requires-python = ">=3.9"
+dependencies = [
+  "click",
+  "gimli.units",
+  "model_metadata",
+  "numpy",
+  "pytest",
+  "pytest-dependency",
+  "standard_names",
+]
+dynamic = ["readme"]
+
+[project.optional-dependencies]
+dev = [
+  "black",
+  "flake8",
+]
+testing = [
+  "coveralls",
+  "pytest>=3.6",
+  "pytest-cov",
+]
+docs = [
+  "sphinx>=1.5.1",
+]
+build = [
+  "build",
+  "twine",
+  "zest.releaser"
+]
+
+[project.urls]
+homepage = "https://csdms.colorado.edu"
+documentation = "https://csdms.colorado.edu"
+repository = "https://github.com/csdms/bmi-tester"
+changelog = "https://github.com/csdms/bmi-tester/blob/master/CHANGES.rst"
+
+[project.scripts]
+bmi-test = "bmi_tester.bmipytest:main"
+
+[project.entry-points."bmi.plugins"]
+bmi_test = "bmi_tester.bmipytest:configure_parser_test"
+
+[tool.setuptools.dynamic]
+readme = {file = ["README.rst", "CREDITS.rst", "CHANGES.rst"], content-type = "text/x-rst"}
 
 [tool.pytest.ini_options]
 minversion = "6.0.0rc1"
 testpaths = ["tests"]
 norecursedirs = [".*", "*.egg*", "build", "dist"]
 addopts = """
-    --ignore setup.py
     --ignore bmi_tester/bootstrap
     --ignore bmi_tester/tests
     --tb native
@@ -27,3 +105,6 @@ include_trailing_comma = true
 force_grid_wrap = 0
 combine_as_imports = true
 line_length = 88
+
+[tool.zest-releaser]
+tag-format = "v{version}"
diff --git a/requirements.txt b/requirements.txt
index 3762ea3..b038a0f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 click
+gimli.units
 model_metadata
 numpy
 pytest
diff --git a/setup.cfg b/setup.cfg
index 84dedf4..c44ff5d 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,3 @@
-[zest.releaser]
-tag-format = v{version}
-
 [flake8]
 exclude = docs
 ignore =
@@ -8,3 +5,6 @@ ignore =
 	E501
 	W503
 max-line-length = 88
+
+[coverage:run]
+relative_files = True
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 479ec81..0000000
--- a/setup.py
+++ /dev/null
@@ -1,43 +0,0 @@
-#! /usr/bin/env python
-from setuptools import find_packages, setup
-
-
-def read(filename):
-    with open(filename, "r", encoding="utf-8") as fp:
-        return fp.read()
-
-
-long_description = u"\n\n".join(
-    [read("README.rst"), read("CREDITS.rst"), read("CHANGES.rst")]
-)
-
-
-setup(
-    name="bmi-tester",
-    version="0.5.6.dev0",
-    author="Eric Hutton",
-    author_email="eric.hutton@colorado.edu",
-    url="https://github.com/csdms/bmi-tester",
-    description="Test Python BMI bindings.",
-    long_description=long_description,
-    classifiers=[
-        "Development Status :: 4 - Beta",
-        "Intended Audience :: Science/Research",
-        "License :: OSI Approved :: MIT License",
-        "Operating System :: OS Independent",
-        "Programming Language :: Cython",
-        "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.6",
-        "Programming Language :: Python :: 3.7",
-        "Programming Language :: Python :: Implementation :: CPython",
-        "Topic :: Scientific/Engineering :: Physics",
-    ],
-    keywords=["bmi"],
-    install_requires=open("requirements.txt", "r").read().splitlines(),
-    packages=find_packages(),
-    include_package_data=True,
-    entry_points={
-        "console_scripts": ["bmi-test=bmi_tester.bmipytest:main"],
-        "bmi.plugins": ["bmi_test=bmi_tester.bmipytest:configure_parser_test"],
-    },
-)