diff --git a/.github/workflows/packaging.yml b/.github/workflows/packaging.yml
new file mode 100644
index 0000000..52c09c9
--- /dev/null
+++ b/.github/workflows/packaging.yml
@@ -0,0 +1,141 @@
+name: Packaging
+
+on:
+  - push
+
+jobs:
+  format:
+    name: Check formatting
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install tox
+        run: python -m pip install tox
+
+      - name: Run black
+        run: tox -e format
+
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install tox
+        run: python -m pip install tox
+
+      - name: Run flake8
+        run: tox -e lint
+
+  typecheck:
+    name: Type check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install tox
+        run: python -m pip install tox
+
+      - name: Run mypy
+        run: tox -e typecheck
+
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python:
+          - version: "3.13"
+            toxenv: "py313"
+          - version: "3.12"
+            toxenv: "py312"
+          - version: "3.11"
+            toxenv: "py311"
+          - version: "3.10"
+            toxenv: "py310"
+          - version: "3.9"
+            toxenv: "py39"
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python.version }}
+
+      - name: Install tox
+        run: python -m pip install tox
+
+      - name: Run pytest
+        run: tox -e ${{ matrix.python.toxenv }}
+
+  build_source_dist:
+    name: Build source distribution
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install build
+        run: python -m pip install build
+
+      - name: Run build
+        run: python -m build --sdist
+
+      - uses: actions/upload-artifact@v4
+        with:
+          path: dist/*.tar.gz
+
+  publish:
+    needs: [format, lint, typecheck, test]
+    if: startsWith(github.ref, 'refs/tags')
+    runs-on: ubuntu-latest
+    environment: release
+    permissions:
+      id-token: write
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: 3.9
+
+      - name: Install pypa/build
+        run: python -m pip install build
+
+      - name: Build distribution
+        run: python -m build --outdir dist/
+
+      - name: Publish distribution to Test PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          repository_url: https://test.pypi.org/legacy/
+
+      - name: Publish distribution to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+
+      - name: Publish distribution to GitHub release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: |
+            dist/django_webmention-*.whl
+            dist/django_webmention-*.tar.gz
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/pyproject.toml b/pyproject.toml
index 7276f76..debf12f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,3 +1,235 @@
+[project]
+name = "django-webmention"
+version = "3.0.0"
+description = "A pluggable implementation of webmention for Django projects"
+authors = [
+    { name = "Dane Hillard", email = "github@danehillard.com" },
+]
+license = { file = "LICENSE" }
+classifiers = [
+    "Development Status :: 5 - Production/Stable",
+    "Intended Audience :: Developers",
+    "Framework :: Django",
+    "Framework :: Django :: 3.2",
+    "Framework :: Django :: 4.0",
+    "Framework :: Django :: 4.1",
+    "Topic :: Internet :: WWW/HTTP :: Indexing/Search",
+    "License :: OSI Approved :: MIT License",
+    "Programming Language :: Python",
+    "Programming Language :: Python :: 3 :: Only",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+]
+dependencies = [
+    "Django>=4.2.0",
+    "requests>=2.32.3",
+]
+
+[project.urls]
+Repository = "https://github.com/easy-as-python/django-webmention"
+
+[tool.setuptools.packages.find]
+where = ["src"]
+exclude = ["test*"]
+
+######################
+# Tool configuration #
+######################
+
 [tool.black]
 line-length = 120
-target-version = ['py35', 'py36', 'py37', 'py38']
+target-version = ["py39", "py310", "py311", "py312", "py313"]
+
+[tool.mypy]
+python_version = "3.9"
+warn_unused_configs = true
+show_error_context = true
+pretty = true
+namespace_packages = true
+check_untyped_defs = true
+
+[[tool.mypy.overrides]]
+module = [
+    "django.core.urlresolvers",
+]
+ignore_missing_imports = true
+
+[tool.coverage.run]
+branch = true
+omit = [
+    "manage.py",
+    "webmention/checks.py",
+    "*test*",
+    "*/migrations/*",
+    "*/admin.py",
+    "*/__init__.py",
+]
+
+[tool.coverage.report]
+precision = 2
+show_missing = true
+skip_covered = true
+
+[tool.coverage.paths]
+source = [
+    "src/webmention",
+    "*/site-packages/webmention",
+]
+
+[tool.pytest.ini_options]
+DJANGO_SETTINGS_MODULE = "tests.settings"
+testpaths = ["tests"]
+addopts = ["-ra", "-q", "--cov=webmention"]
+xfail_strict = true
+
+[tool.tox]
+envlist = [
+    "py39-django4.2",
+    "py39-django5.0",
+    "py39-django5.1",
+    "py310-django4.2",
+    "py310-django5.0",
+    "py310-django5.1",
+    "py311-django4.2",
+    "py311-django5.0",
+    "py311-django5.1",
+    "py312-django4.2",
+    "py312-django5.0",
+    "py312-django5.1",
+    "py313-django4.2",
+    "py313-django5.0",
+    "py313-django5.1",
+]
+
+[tool.tox.env_run_base]
+deps = [
+    "pytest",
+    "pytest-cov",
+    "pytest-django",
+]
+commands = [
+    ["pytest", { replace = "posargs", default = [], extend = true }],
+]
+
+[tool.tox.env."py39-django4.2"]
+deps = [
+    { replace = "ref", of = ["tool", "tox", "env_run_base", "deps"], extend = true },
+    "Django>=4.2,<4.3",
+]
+
+[tool.tox.env."py39-django5.0"]
+deps = [
+    { replace = "ref", of = ["tool", "tox", "env_run_base", "deps"], extend = true },
+    "Django>=5.0,<5.1",
+]
+
+[tool.tox.env."py39-django5.1"]
+deps = [
+    { replace = "ref", of = ["tool", "tox", "env_run_base", "deps"], extend = true },
+    "Django>=5.1,<5.2",
+]
+
+[tool.tox.env."py310-django4.2"]
+deps = [
+    { replace = "ref", of = ["tool", "tox", "env_run_base", "deps"], extend = true },
+    "Django>=4.2,<4.3",
+]
+
+[tool.tox.env."py310-django5.0"]
+deps = [
+    { replace = "ref", of = ["tool", "tox", "env_run_base", "deps"], extend = true },
+    "Django>=5.0,<5.1",
+]
+
+[tool.tox.env."py310-django5.1"]
+deps = [
+    { replace = "ref", of = ["tool", "tox", "env_run_base", "deps"], extend = true },
+    "Django>=5.1,<5.2",
+]
+
+[tool.tox.env."py311-django4.2"]
+deps = [
+    { replace = "ref", of = ["tool", "tox", "env_run_base", "deps"], extend = true },
+    "Django>=4.2,<4.3",
+]
+
+[tool.tox.env."py311-django5.0"]
+deps = [
+    { replace = "ref", of = ["tool", "tox", "env_run_base", "deps"], extend = true },
+    "Django>=5.0,<5.1",
+]
+
+[tool.tox.env."py311-django5.1"]
+deps = [
+    { replace = "ref", of = ["tool", "tox", "env_run_base", "deps"], extend = true },
+    "Django>=5.1,<5.2",
+]
+
+[tool.tox.env."py312-django4.2"]
+deps = [
+    { replace = "ref", of = ["tool", "tox", "env_run_base", "deps"], extend = true },
+    "Django>=4.2,<4.3",
+]
+
+[tool.tox.env."py312-django5.0"]
+deps = [
+    { replace = "ref", of = ["tool", "tox", "env_run_base", "deps"], extend = true },
+    "Django>=5.0,<5.1",
+]
+
+[tool.tox.env."py312-django5.1"]
+deps = [
+    { replace = "ref", of = ["tool", "tox", "env_run_base", "deps"], extend = true },
+    "Django>=5.1,<5.2",
+]
+
+[tool.tox.env."py313-django4.2"]
+deps = [
+    { replace = "ref", of = ["tool", "tox", "env_run_base", "deps"], extend = true },
+    "Django>=4.2,<4.3",
+]
+
+[tool.tox.env."py313-django5.0"]
+deps = [
+    { replace = "ref", of = ["tool", "tox", "env_run_base", "deps"], extend = true },
+    "Django>=5.0,<5.1",
+]
+
+[tool.tox.env."py313-django5.1"]
+deps = [
+    { replace = "ref", of = ["tool", "tox", "env_run_base", "deps"], extend = true },
+    "Django>=5.1,<5.2",
+]
+
+[tool.tox.env.lint]
+skip_install = true
+deps = [
+    "ruff",
+]
+commands = [
+    ["ruff", "check", { replace = "posargs", default = ["--diff", "src/webmention", "tests"], extend = true }],
+]
+
+[tool.tox.env.format]
+skip_install = true
+deps = [
+    "black",
+]
+commands = [
+    ["black", { replace = "posargs", default = ["--check", "--diff", "src/webmention", "tests"], extend = true }],
+]
+
+[tool.tox.env.typecheck]
+deps = [
+    { replace = "ref", of = ["tool", "tox", "env_run_base", "deps"], extend = true },
+    "mypy",
+    "django-types",
+    "types-requests",
+]
+commands = [
+    ["mypy", { replace = "posargs", default = ["src/webmention", "tests"], extend = true }],
+]
diff --git a/setup.cfg b/setup.cfg
deleted file mode 100644
index 8ffb45e..0000000
--- a/setup.cfg
+++ /dev/null
@@ -1,89 +0,0 @@
-[metadata]
-name = django-webmention
-version = 3.0.0
-description = A pluggable implementation of webmention for Django projects
-author = Dane Hillard
-author_email = github@danehillard.com
-long_description = file: README.md
-long_description_content_type = text/markdown
-url = https://github.com/easy-as-python/django-webmention
-license = MIT
-license_file = LICENSE
-classifiers =
-    Development Status :: 5 - Production/Stable
-    Intended Audience :: Developers
-    Framework :: Django
-    Framework :: Django :: 3.2
-    Framework :: Django :: 4.0
-    Framework :: Django :: 4.1
-    Topic :: Internet :: WWW/HTTP :: Indexing/Search
-    License :: OSI Approved :: MIT License
-    Programming Language :: Python
-    Programming Language :: Python :: 3 :: Only
-    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
-
-[options]
-package_dir = =src
-packages = find:
-install_requires =
-    Django>=2.2.0
-    requests>=2.7.0
-
-[options.packages.find]
-where = src
-
-[options.extras_require]
-test =
-    coverage
-    pytest
-    pytest-cov
-    pytest-django
-lint =
-    pyflakes
-    black
-
-[coverage:run]
-branch = True
-omit =
-    manage.py
-    setup.py
-    webmention/checks.py
-    *test*
-    */migrations/*
-    */admin.py
-    */__init__.py
-
-[coverage:report]
-precision = 2
-show_missing = True
-skip_covered = True
-
-[tool:pytest]
-DJANGO_SETTINGS_MODULE = tests.test_settings
-python_files =
-    tests.py
-    test_*.py
-addopts = -ra -q --cov=webmention
-
-[tox:tox]
-envlist = {py37,py38,py39,py310,py311}-django{3.2,4.0,4.1}
-
-[testenv]
-extras = test
-commands =
-    pytest {posargs}
-deps =
-    django3.1: Django>=3.2,<3.3
-    django4.0: Django>=4.0,<4.1
-    django4.1: Django>=4.1,<4.2
-
-[testenv:lint]
-extras = lint
-commands =
-    pyflakes src/webmention tests
-    black --check src/webmention tests
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 056ba45..0000000
--- a/setup.py
+++ /dev/null
@@ -1,4 +0,0 @@
-import setuptools
-
-
-setuptools.setup()
diff --git a/src/webmention/models.py b/src/webmention/models.py
index 55675e2..a0fe851 100644
--- a/src/webmention/models.py
+++ b/src/webmention/models.py
@@ -1,8 +1,10 @@
+from django.contrib.admin import display
 from django.db import models
 from django.utils.html import format_html
 
 
 class WebMentionResponse(models.Model):
+    id: int
     response_body = models.TextField()
     response_to = models.URLField()
     source = models.URLField()
@@ -18,15 +20,13 @@ class Meta:
     def __str__(self):
         return self.source
 
+    @display(description="source")
     def source_for_admin(self):
-        return format_html('<a href="{href}">{href}</a>'.format(href=self.source))
-
-    source_for_admin.short_description = "source"
+        return format_html('<a href="{}">{}</a>', self.source, self.source)
 
+    @display(description="response to")
     def response_to_for_admin(self):
-        return format_html('<a href="{href}">{href}</a>'.format(href=self.response_to))
-
-    response_to_for_admin.short_description = "response to"
+        return format_html('<a href="{}">{}</a>', self.response_to, self.response_to)
 
     def invalidate(self):
         if self.id:
diff --git a/src/webmention/views.py b/src/webmention/views.py
index 8b381b3..ff33ff3 100644
--- a/src/webmention/views.py
+++ b/src/webmention/views.py
@@ -27,7 +27,8 @@ def receive(request):
             webmention.update(source, target, response_body)
             return HttpResponse("The webmention was successfully received", status=202)
         except (SourceFetchError, TargetNotFoundError) as e:
-            webmention.invalidate()
+            if webmention:
+                webmention.invalidate()
             return HttpResponseBadRequest(str(e))
         except Exception as e:
             return HttpResponseServerError(str(e))
diff --git a/tests/test_settings.py b/tests/settings.py
similarity index 100%
rename from tests/test_settings.py
rename to tests/settings.py