diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 75771d5..f8545ec 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -14,9 +14,9 @@ jobs:
       uses: actions/setup-python@v3
       with:
         python-version: '3.x'
-        cache: pip
-        cache-dependency-path: requirements/dev.txt
+    - name: Install tox
+      run: pip install tox
     - name: Lint
-      run: make lint
+      run: tox -e lint
     - name: Test
-      run: make test
+      run: tox
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index aaee692..ea93533 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -19,14 +19,14 @@ jobs:
       uses: actions/setup-python@v3
       with:
         python-version: '3.x'
-        cache: pip
-        cache-dependency-path: .github/workflows/release.yml
+    - name: Install project
+      run: pip install .[dev]
     - name: Lint
-      run: make lint
+      run: tox -e lint
     - name: Test
-      run: make test
+      run: tox
     - name: Install build dependencies
-      run: pip install -U setuptools wheel build calver
+      run: pip install -U setuptools wheel build
     - name: Build
       run: python -m build .
     - name: Publish
@@ -44,7 +44,8 @@ jobs:
         cache-dependency-path: .github/workflows/release.yml
     - name: Version
       id: version
-      run: echo "::set-output name=version::$(python setup.py --version 2>/dev/null)"
+      run: |
+        echo version=$(python -c "from trove_classifiers import version; print(version.__version__)" 2>/dev/null) >> $GITHUB_OUTPUT
     - name: Tag
       uses: actions/create-release@v1
       env:
diff --git a/.gitignore b/.gitignore
index fe11925..ae59162 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,10 @@
 build/
 dist/
 *.egg-info/
+.tox/
+.venv/
+.env/
+env/
+venv/
+.idea/
+.vscode/
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 45a0ff5..6ca1081 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,5 +1,5 @@
 # Contributing
-How to contributing to this package.
+How to contribute to this package.
 
 ## Running tests
 Run `make test`. This checks whether the auto-generated list of classifiers
diff --git a/Makefile b/Makefile
deleted file mode 100644
index 81c0d1e..0000000
--- a/Makefile
+++ /dev/null
@@ -1,26 +0,0 @@
-BINDIR = $(PWD)/.state/env/bin
-
-.state/env/pyvenv.cfg: requirements/dev.txt
-	rm -rf .state/env
-	python -m venv .state/env
-
-	# install/upgrade general requirements
-	$(BINDIR)/python -m pip install --upgrade pip setuptools wheel
-
-	# install various types of requirements
-	$(BINDIR)/python -m pip install -r requirements/dev.txt
-
-test: .state/env/pyvenv.cfg
-	$(BINDIR)/python -m pip install .
-	$(BINDIR)/pytest
-	$(BINDIR)/python -m tests.lib
-
-lint: .state/env/pyvenv.cfg
-	$(BINDIR)/black --check bin setup.py src tests
-	$(BINDIR)/python bin/sort.py src/trove_classifiers/__init__.py
-	$(BINDIR)/mypy src
-
-reformat: .state/env/pyvenv.cfg
-	$(BINDIR)/black tests src
-
-.PHONY: build test lint reformat
diff --git a/pyproject.toml b/pyproject.toml
index 05374a2..0dde369 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,45 @@
 [build-system]
-requires = ["setuptools", "calver"]
+requires = ["setuptools >= 61.0"]
 build-backend = "setuptools.build_meta"
 
+[project]
+name = "trove-classifiers"
+readme = "README.md"
+description = "Canonical source for classifiers on PyPI (pypi.org)."
+authors = [{name = "The PyPI Admins", email = "admin@pypi.org"}]
+classifiers = [
+    "Development Status :: 5 - Production/Stable",
+    "Intended Audience :: Developers",
+    "License :: OSI Approved :: Apache Software License",
+    "Programming Language :: Python :: 3",
+    "Typing :: Typed",
+]
+keywords = ["classifiers"]
+dynamic = ["version"]
+
+[project.urls]
+Homepage = "https://github.com/pypa/trove-classifiers"
+
+[project.optional-dependencies]
+dev = [
+    "tox >= 4.0"
+]
+
+[tool.setuptools]
+package-dir = {"" = "src"}
+include-package-data = false
+
+[tool.setuptools.packages.find]
+where = ["src"]
+namespaces = false
+
+[tool.setuptools.package-data]
+"*" = ["py.typed"]
+
+[tool.setuptools.dynamic.version]
+attr = "trove_classifiers.version.__version__"
+
+
 [tool.mypy]
 strict = true
 warn_unreachable = true
diff --git a/requirements/dev.txt b/requirements/dev.txt
deleted file mode 100644
index 533f3b6..0000000
--- a/requirements/dev.txt
+++ /dev/null
@@ -1,5 +0,0 @@
-black
-jinja2
-natsort
-pytest
-mypy
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 826eac7..0000000
--- a/setup.py
+++ /dev/null
@@ -1,33 +0,0 @@
-from io import open
-from os import path
-
-from setuptools import setup, find_packages
-
-here = path.abspath(path.dirname(__file__))
-
-# Get the long description from the README file
-with open(path.join(here, "README.md"), encoding="utf-8") as f:
-    long_description = f.read()
-
-setup(
-    name="trove-classifiers",
-    description="Canonical source for classifiers on PyPI (pypi.org).",
-    long_description=long_description,
-    long_description_content_type="text/markdown",
-    url="https://github.com/pypa/trove-classifiers",
-    author="The PyPI Admins",
-    author_email="admin@pypi.org",
-    classifiers=[
-        "Development Status :: 5 - Production/Stable",
-        "Intended Audience :: Developers",
-        "License :: OSI Approved :: Apache Software License",
-        "Programming Language :: Python :: 3",
-        "Typing :: Typed",
-    ],
-    keywords="classifiers",
-    package_dir={"": "src"},
-    packages=find_packages(where="src"),
-    package_data={"": ["py.typed"]},
-    use_calver=True,
-    setup_requires=["calver"],
-)
diff --git a/src/trove_classifiers/version.py b/src/trove_classifiers/version.py
new file mode 100644
index 0000000..09d1db5
--- /dev/null
+++ b/src/trove_classifiers/version.py
@@ -0,0 +1 @@
+__version__ = "2022.12.22"
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..57fbe1e
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,43 @@
+[tox]
+envlist =
+    py311
+    py310
+    py39
+    py38
+    py37
+    lint
+    reformat
+
+isolated_build = true
+skip_missing_interpreters = true
+minversion = 4.0
+
+[testenv]
+description = run the tests with pytest under {envname}
+passenv =
+    PYTEST_*
+deps =
+    pytest >= 7.1
+commands =
+    pytest {posargs}
+    python -m tests.lib
+
+[testenv:lint]
+description = lint the code base
+skip_install = true
+deps =
+    black >= 22.12.0
+    mypy >= 0.991
+    natsort >= 8.2
+commands =
+    black --check bin src tests
+    python bin/sort.py src/trove_classifiers/__init__.py
+    mypy src
+
+[testenv:reformat]
+description = format the code base
+skip_install = true
+deps =
+    black >= 22.12.0
+commands =
+    black tests src