diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
new file mode 100644
index 0000000..84e51d4
--- /dev/null
+++ b/.github/workflows/publish.yml
@@ -0,0 +1,32 @@
+name: Client Build and Publish
+
+on:
+  workflow_dispatch:
+
+jobs:
+  pypi-publish:
+    name: Upload release to PyPI
+    runs-on: ubuntu-latest
+    environment:
+      name: pypi
+      url: https://pypi.org/p/django-richenum
+    permissions:
+      contents: read
+      id-token: write
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: "3.11"
+    - name: Install Poetry
+      run: |
+        make poetry
+    - name: Install dependencies
+      run: |
+        make install-build
+    - name: Build package
+      run: |
+        make build
+    - name: Publish package distributions to PyPI
+      uses: pypa/gh-action-pypi-publish@release/v1
diff --git a/.github/workflows/python-version-tests.yml b/.github/workflows/python-version-tests.yml
new file mode 100644
index 0000000..b485656
--- /dev/null
+++ b/.github/workflows/python-version-tests.yml
@@ -0,0 +1,82 @@
+name: Python Version Tests
+
+on:
+  push:
+    branches: ["master"]
+  pull_request:
+    branches: ["master"]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    env:
+      SECRET_KEY: placeholder
+      DJANGO_DB_ENGINE: ${{ matrix.db-engine }}
+      DJANGO_DB_HOST: 127.0.0.1
+      DJANGO_DB_USER: travis
+      DJANGO_DB_PASSWORD: travis
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        django-version: ["3.2", "4.0", "4.1", "4.2"]
+        db-engine: ["sqlite", "mysql", "postgres"]
+        exclude:
+        - python-version: "3.11"
+          django-version: "3.2"
+        - python-version: "3.11"
+          django-version: "4.0"
+    services:
+      postgres:
+        image: postgres:12
+        ports:
+        - 5432:5432
+        options: >-
+          --health-cmd=pg_isready
+          --health-interval=10s
+          --health-timeout=5s
+          --health-retries=5
+        env:
+          POSTGRES_DB: testdb
+          POSTGRES_USER: travis
+          POSTGRES_PASSWORD: travis
+      mysql:
+        image: mysql:8
+        ports:
+        - 3306:3306
+        options: >-
+          --health-cmd="mysqladmin ping"
+          --health-interval=10s
+          --health-timeout=5s
+          --health-retries=5
+        env:
+          MYSQL_USER: travis
+          MYSQL_PASSWORD: travis
+          MYSQL_ALLOW_EMPTY_PASSWORD: true
+          MYSQL_DATABASE: test_testdb
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install Poetry
+      run: |
+        make poetry
+    - name: Install dependencies
+      run: |
+        make install-dev
+    - name: Pin Django version
+      run: |
+        poetry run pip install "Django==${{ matrix.django-version }}.*"
+    - name: Lint with flake8 and pylint
+      run: |
+        make lint
+    - name: Test with custom Django runner
+      run: |
+        make test
diff --git a/.github/workflows/tox.yml b/.github/workflows/tox.yml
deleted file mode 100644
index d413b50..0000000
--- a/.github/workflows/tox.yml
+++ /dev/null
@@ -1,61 +0,0 @@
-# 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
-
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
-
-jobs:
-  test:
-    runs-on: ubuntu-latest
-    strategy:
-      max-parallel: 1
-      matrix:
-        python-version: [3.8, 3.9, '3.10', '3.11']
-    services:
-      postgres:
-        image: postgres:12
-        ports:
-        - 5432:5432
-        options: >-
-          --health-cmd=pg_isready
-          --health-interval=10s
-          --health-timeout=5s
-          --health-retries=5
-        env:
-          POSTGRES_DB: testdb
-          POSTGRES_USER: travis
-          POSTGRES_PASSWORD: travis
-      mysql:
-        image: mysql:8
-        ports:
-          - 3306:3306
-        options: >-
-          --health-cmd="mysqladmin ping"
-          --health-interval=10s
-          --health-timeout=5s
-          --health-retries=5
-        env:
-          MYSQL_USER: travis
-          MYSQL_PASSWORD: travis
-          MYSQL_ALLOW_EMPTY_PASSWORD: true
-          MYSQL_DATABASE: test_testdb
-
-    steps:
-    - uses: actions/checkout@v1
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v1
-      with:
-        python-version: ${{ matrix.python-version }}
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        pip install tox tox-gh-actions
-    - name: Test with tox
-      run: tox
-    - name: Lint with tox
-      run: tox -e lint
diff --git a/AUTHORS.md b/AUTHORS.md
new file mode 100644
index 0000000..131a461
--- /dev/null
+++ b/AUTHORS.md
@@ -0,0 +1,12 @@
+Developed and maintained by [Hearsay Social, Inc.](https://hearsaysocial.com).
+
+## Contributors
+
+- [Adam DePue](https://github.com/adepue)
+- [Akshay Shah](https://github.com/akshayjshah)
+- [Cordelia Notbohm](https://github.com/cnotbohm)
+- [Dale Hui](https://github.com/dhui)
+- [Robert MacCloy](https://github.com/rbm)
+- [Ben Lopatin](https://github.com/bennylope)
+- [Asher Foa](https://github.com/asherf)
+- [Krisztian Csizmazia](https://github.com/csizmaziakiki)
diff --git a/AUTHORS.rst b/AUTHORS.rst
deleted file mode 100644
index 83167db..0000000
--- a/AUTHORS.rst
+++ /dev/null
@@ -1,12 +0,0 @@
-Developed and maintained by `Hearsay Social, Inc.
-<https://hearsaysocial.com>`_.
-
-Contributors
-============
-| `Adam DePue <https://github.com/adepue>`_
-| `Akshay Shah <https://github.com/akshayjshah>`_
-| `Dale Hui <https://github.com/dhui>`_
-| `Robert MacCloy <https://github.com/rbm>`_
-| `Ben Lopatin <https://github.com/bennylope>`_
-| `Asher Foa <https://github.com/asherf>`_
-| `Krisztian Csizmazia <https://github.com/csizmaziakiki>`_
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..44d6c52
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,101 @@
+# Changelog
+
+## 5.1.0 (2023-3-4)
+- Migrate to poetry
+
+## 4.1.0 (2023-12-12)
+
+- Support for Django 4.2
+- Support for Python 3.11
+- Remove support for Django 2.2, 3.0, 3.1
+- Remove support for Python 3.7
+- Require MySQL 8 and Postgres 12
+
+## 3.7.0 (2019-09-05)
+
+- Support for Django 2.3
+
+## 3.6.0 (2019-07-09)
+
+- Support for Django 2.2
+- Support for Python 3.7
+- Remove support for Django 2.0
+
+## 3.5.0 (2018-09-10)
+
+- Fix [deprecation of context param for Field.from_db_value](https://code.djangoproject.com/ticket/28370)
+- Support for Django 2.1
+- Switch tests suite to use pytest
+- Remove pylint-django plugin, no longer needed
+
+## 3.4.0 (2018-02-10)
+
+- Drop support for old Django versions
+
+## 3.3.0 (2018-01-21)
+
+- removed Python 3.4
+- add support for Python 3.6
+- add support for Django 2.0
+- Properly mark raw strings (used as regex)
+
+## 3.2.0 (2016-08-22)
+
+- Python 3.4 & 3.5 support
+
+## 3.1.0 (2015-08-02)
+
+- Django 1.10 support
+
+## 3.0.1 (2015-07-13)
+
+- Prepare for python 3 support
+
+## 2.4.1 (2015-05-04)
+
+- replace mysql client library (for tests)
+- stop using lambdas
+
+## 2.3.0 (2015-05-04)
+
+- Support Django 1.8
+
+## 2.2.0 (2015-03-11)
+
+- Support ModelForms for non-SQLite DB backends
+
+## 2.1.0 (2014-11-01)
+
+- Support migration in Django 1.7
+
+## 2.0.0 (2014-09-04)
+
+- Support Django 1.7, drop support for Python 2.6.
+
+## 1.2.2 (2014-08-02)
+
+- Support Django 1.3
+
+## 1.2.1 (2014-06-02)
+
+- Remove uses of BaseException.message.
+
+## 1.2.0 (2013-12-03)
+
+- Add enum-aware versions of TypedMultipleChoiceField.
+
+## 1.1.0 (2013-12-03)
+
+- Fix form fields to support Django 1.6 (while maintaining compatibility with 1.4 and 1.5).
+
+## 1.0.2 (2013-11-05)
+
+- Make EnumField.run_validators a no-op. This stops some warnings from type comparison, and it doesn't seem useful in an EnumField context.
+
+## 1.0.1 (2013-09-10)
+
+- Support South.
+
+## 1.0.0 (2013-08-16)
+
+- Initial public release.
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
deleted file mode 100644
index 9204313..0000000
--- a/CHANGELOG.rst
+++ /dev/null
@@ -1,103 +0,0 @@
-Changelog
-=========
-
-4.1.0 (2023-12-12)
-------------------
-    - Support for Django 4.2
-    - Support for Python 3.11
-    - Remove support for Django 2.2, 3.0, 3.1
-    - Remove support for Python 3.7
-    - Require MySQL 8 and Postgres 12 
-
-3.7.0 (2019-09-05)
-------------------
-    - Support for Django 2.3
-
-3.6.0 (2019-07-09)
-------------------
-    - Support for Django 2.2
-    - Support for Python 3.7
-    - Remove support for Django 2.0
-
-3.5.0 (2018-09-10)
-------------------
-    - Fix [deprecation of context param for Field.from_db_value](https://code.djangoproject.com/ticket/28370)
-    - Support for Django 2.1
-    - Switch tests suite to use pytest
-    - Remove pylint-django plugin, no longer needed
-
-3.4.0 (2018-02-10)
-------------------
-    - Drop support for old Django versions
-
-
-3.3.0 (2018-01-21)
-------------------
-    - removed Python 3.4
-    - add support for Python 3.6
-    - add support for Django 2.0
-    - Properly mark raw strings (used as regex)
-
-3.2.0 (2016-08-22)
-------------------
-    - Python 3.4 & 3.5 support
-
-3.1.0 (2015-08-02)
-------------------
-    - Django 1.10 support
-
-3.0.1 (2015-07-13)
-------------------
-    - Prepare for python 3 support
-
-2.4.1 (2015-05-04)
-------------------
-    - replace mysql client library (for tests)
-    - stop using lambdas
-
-2.3.0 (2015-05-04)
-------------------
-    - Support Django 1.8
-
-2.2.0 (2015-03-11)
-------------------
-    - Support ModelForms for non-SQLite DB backends
-
-2.1.0 (2014-11-01)
-------------------
-    - Support migration in Django 1.7
-
-2.0.0 (2014-09-04)
-------------------
-    - Support Django 1.7, drop support for Python 2.6.
-
-1.2.2 (2014-08-02)
-------------------
-    - Support Django 1.3
-
-1.2.1 (2014-06-02)
-------------------
-    - Remove uses of BaseException.message.
-
-1.2.0 (2013-12-03)
-------------------
-    - Add enum-aware versions of TypedMultipleChoiceField.
-
-1.1.0 (2013-12-03)
-------------------
-    - Fix form fields to support Django 1.6 (while maintaining
-      compatibility with 1.4 and 1.5).
-
-1.0.2 (2013-11-05)
-------------------
-    - Make EnumField.run_validators a no-op.
-      This stops some warnings from type comparison, and it doesn't seem
-      useful in an EnumField context.
-
-1.0.1 (2013-09-10)
-------------------
-    - Support South.
-
-1.0.0 (2013-08-16)
-------------------
-    - Initial public release.
diff --git a/MANIFEST.in b/MANIFEST.in
deleted file mode 100644
index 98c429d..0000000
--- a/MANIFEST.in
+++ /dev/null
@@ -1 +0,0 @@
-include *.rst LICENSE.txt
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..54f4eef
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,32 @@
+REPO = $(shell git rev-parse --show-toplevel)
+POETRY = poetry
+
+install-build:
+	${POETRY} install --only=main
+
+install-dev:
+	${POETRY} install
+
+poetry:
+	curl -sSL https://install.python-poetry.org | POETRY_VERSION=1.8.4 python3 -
+	poetry cache clear pypi --all
+	poetry config virtualenvs.in-project true
+
+quickstart: poetry install-dev
+
+quickstart-build: poetry install-build
+
+clean:
+	# Delete all .pyc and .pyo files.
+	find ${REPO} \( -name "*~" -o -name "*.py[co]" -o -name ".#*" -o -name "#*#" \) -exec rm -f '{}' +
+	rm -rf build dist src/django_richenum.egg-info django_richenum.egg-info
+
+lint: clean
+	${POETRY} run flake8 --config=${REPO}/setup.cfg ${REPO}/src/django_richenum/ ${REPO}/tests/
+	${POETRY} run pylint --rcfile=${REPO}/pylint.rc ${REPO}/src/django_richenum/ ${REPO}/tests/
+
+test: clean
+	${POETRY} run python ${REPO}/tests/run_tests.py
+
+build:
+	${POETRY} build
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..748e523
--- /dev/null
+++ b/README.md
@@ -0,0 +1,129 @@
+# django-richenum
+
+[![Latest PyPI Version](https://img.shields.io/pypi/v/django-richenum.svg)](https://pypi.python.org/pypi/django-richenum/)
+[![Python versions](https://img.shields.io/pypi/pyversions/django-richenum.svg)](https://pypi.org/project/django-richenum/)
+[![PyPI Downloads](https://img.shields.io/pypi/dm/django-richenum.svg)](https://pypi.org/project/django-richenum/)
+
+## About
+
+A Django extension of richenum for Python. If you're unfamiliar with richenums, please read up on them (see [Related Packages](#related-packages)) before using django-richenum.
+
+### Model Fields
+
+`IndexEnumField`  
+Store ints in DB, but expose OrderedRichEnumValues in Python.
+
+`CanonicalNameEnumField`  
+Store varchar in DB, but expose RichEnumValues in Python.  
+We recommend that you use `IndexEnumField` for storage and query efficiency.
+
+`LaxIndexEnumField`  
+Like `IndexEnumField`, but also allows casting to and from canonical names.  
+Mainly used to help migrate existing code that uses strings as database values.
+
+### Form Fields
+
+`CanonicalEnumField`  
+Uses the RichEnum/OrderedRichEnum `canonical_name` as form field values.
+
+`IndexEnumField`  
+Uses the OrderedRichEnum `index` as form field values.
+
+### Django Admin
+
+`RichEnumFieldListFilter`  
+Enables filtering by RichEnum model fields in the Django admin UI.
+
+## Links
+
+- [GitHub: django-richenum](https://github.com/hearsaycorp/django-richenum)
+- [PyPI: django-richenum](https://pypi.python.org/pypi/django-richenum/)
+
+## Installation
+
+```bash
+pip install django-richenum
+```
+
+## Example Usage
+
+### IndexEnumField
+
+```python
+>>> from richenum import OrderedRichEnum, OrderedRichEnumValue
+>>> class MyOrderedRichEnum(OrderedRichEnum):
+...    FOO = OrderedRichEnumValue(index=1, canonical_name="foo", display_name="Foo")
+...    BAR = OrderedRichEnumValue(index=2, canonical_name="bar", display_name="Bar")
+...
+>>> from django.db import models
+>>> from django_richenum.models import IndexEnumField
+>>> class MyModel(models.Model):
+...    my_enum = IndexEnumField(MyOrderedRichEnum, default=MyOrderedRichEnum.FOO)
+...
+>>> m = MyModel.objects.create(my_enum=MyOrderedRichEnum.BAR)
+>>> m.save()
+>>> m.my_enum
+OrderedRichEnumValue - idx: 2  canonical_name: 'bar'  display_name: 'Bar'
+>>> MyModel.objects.filter(my_enum=MyOrderedRichEnum.BAR)
+```
+
+### CanonicalNameEnumField
+
+```python
+>>> from richenum import RichEnum, RichEnumValue
+>>> class MyRichEnum(RichEnum):
+...    FOO = RichEnumValue(canonical_name="foo", display_name="Foo")
+...    BAR = RichEnumValue(canonical_name="bar", display_name="Bar")
+...
+>>> from django.db import models
+>>> from django_richenum.models import CanonicalNameEnumField
+>>> class MyModel(models.Model):
+...    my_enum = CanonicalNameEnumField(MyRichEnum, default=MyRichEnum.FOO)
+...
+>>> m = MyModel.objects.create(my_enum=MyRichEnum.BAR)
+>>> m.save()
+>>> m.my_enum
+RichEnumValue - canonical_name: 'bar'  display_name: 'Bar'
+>>> MyModel.objects.filter(my_enum=MyRichEnum.BAR)
+```
+
+### RichEnumFieldListFilter
+
+```python
+>>> from django_richenum.admin import register_admin_filters
+>>> register_admin_filters()
+```
+
+## Related Packages
+
+`richenum`  
+Package implementing RichEnum and OrderedRichEnum that django-richenum depends on.
+
+- [GitHub: richenum](https://github.com/hearsaycorp/richenum)
+- [PyPI: richenum](https://pypi.python.org/pypi/richenum/)
+
+## Notes
+
+If you're using Django 1.7+, you'll need to use the `@deconstructible` decorator for your `RichEnumValue` and `OrderedRichEnumValue` classes so Django's migration framework knows how to serialize your `RichEnumValue` and `OrderedRichEnumValue`.
+
+```python
+>>> from django.utils.deconstruct import deconstructible
+>>> from richenum import RichEnumValue, OrderedRichEnumValue
+>>> @deconstructible
+... class CustomRichEnumValue(RichEnumValue):
+...     pass
+...
+>>> @deconstructible
+... class CustomOrderedRichEnumValue(OrderedRichEnumValue):
+...     pass
+...
+```
+
+## Contributing
+
+1. Fork the repo from [GitHub](https://github.com/hearsaycorp/django-richenum).
+2. Make your changes.
+3. Add unittests for your changes.
+4. Run `make lint` and `make test`.
+5. Add yourself to `AUTHORS.md` (in alphabetical order).
+6. Send a pull request from your fork to the main repo.
diff --git a/README.rst b/README.rst
deleted file mode 100644
index c3c5515..0000000
--- a/README.rst
+++ /dev/null
@@ -1,149 +0,0 @@
-.. role:: python(code)
-          :language: python
-
-django-richenum
-===============
-
-.. image:: https://travis-ci.org/hearsaycorp/django-richenum.png?branch=master
-    :alt: Build Status
-    :target: https://travis-ci.org/hearsaycorp/django-richenum
-
-.. image:: https://img.shields.io/pypi/v/django-richenum.svg
-    :alt: Latest PyPI Version
-    :target: https://pypi.python.org/pypi/django-richenum/
-
-.. image:: https://img.shields.io/pypi/pyversions/django-richenum.svg
-    :alt: Python versions
-    :target: https://pypi.org/project/django-richenum/
-
-.. image:: https://img.shields.io/pypi/dm/django-richenum.svg
-  :alt: Pypi Downloads
-  :target: https://pypi.org/project/django-richenum/
-
-About
-=====
-A Django extension of richenum for Python. If you're unfamiliar with richenums, please read up on them (see `Related Packages`_) before using django-richenum.
-
-Model Fields
-------------
-IndexEnumField
-  Store ints in DB, but expose OrderedRichEnumValues in Python.
-CanonicalNameEnumField
-  Store varchar in DB, but expose RichEnumValues in Python.
-  We recommend that you use IndexEnumField for storage and query efficiency.
-LaxIndexEnumField
-  Like IndexEnumField, but also allows casting to and from canonical names.
-  Mainly used to help migrate existing code that uses strings as database values.
-
-Form Fields
------------
-CanonicalEnumField
-  Uses the RichEnum/OrderedRichEnum canonical_name as form field values.
-IndexEnumField
-  Uses the OrderedRichEnum index as form field values.
-
-Django Admin
-------------
-RichEnumFieldListFilter
-  Enables filtering by RichEnum model fields in the Django admin UI
-
-Links
------
-| `GitHub: django-richenum <https://github.com/hearsaycorp/django-richenum>`_
-| `PyPi: django-richenum <https://pypi.python.org/pypi/django-richenum/>`_
-
-Installation
-============
-.. code:: bash
-
-    $ pip install django-richenum
-
-Example Usage
-=============
-
-IndexEnumField
---------------
-.. code:: python
-
-    >>> from richenum import OrderedRichEnum, OrderedRichEnumValue
-    >>> class MyOrderedRichEnum(OrderedRichEnum):
-    ...    FOO = OrderedRichEnumValue(index=1, canonical_name="foo", display_name="Foo")
-    ...    BAR = OrderedRichEnumValue(index=2, canonical_name="bar", display_name="Bar")
-    ...
-    >>> from django.db import models
-    >>> from django_richenum.models import IndexEnumField
-    >>> class MyModel(models.Model):
-    ...    my_enum = IndexEnumField(MyOrderedRichEnum, default=MyOrderedRichEnum.FOO)
-    ...
-    >>> m = MyModel.objects.create(my_enum=MyOrderedRichEnum.BAR)
-    >>> m.save()
-    >>> m.my_enum
-    OrderedRichEnumValue - idx: 2  canonical_name: 'bar'  display_name: 'Bar'
-    >>> MyModel.objects.filter(my_enum=MyOrderedRichEnum.BAR)
-
-
-CanonicalNameEnumField
-----------------------
-.. code:: python
-
-    >>> from richenum import RichEnum, RichEnumValue
-    >>> class MyRichEnum(RichEnum):
-    ...    FOO = RichEnumValue(canonical_name="foo", display_name="Foo")
-    ...    BAR = RichEnumValue(canonical_name="bar", display_name="Bar")
-    ...
-    >>> from django.db import models
-    >>> from django_richenum.models import CanonicalNameEnumField
-    >>> class MyModel(models.Model):
-    ...    my_enum = CanonicalNameEnumField(MyRichEnum, default=MyRichEnum.FOO)
-    ...
-    >>> m = MyModel.objects.create(my_enum=MyRichEnum.BAR)
-    >>> m.save()
-    >>> m.my_enum
-    RichEnumValue - canonical_name: 'bar'  display_name: 'Bar'
-    >>> MyModel.objects.filter(my_enum=MyRichEnum.BAR)
-
-RichEnumFieldListFilter
------------------------
-.. code:: python
-
-    >>> from django_richenum.admin import register_admin_filters
-    >>> register_admin_filters()
-
-
-Related Packages
-================
-
-richenum
-  Package implementing RichEnum and OrderedRichEnum that django-richenum depends on.
-
-  | `GitHub: richenum <https://github.com/hearsaycorp/richenum>`_
-
-  | `PyPi: richenum <https://pypi.python.org/pypi/richenum/>`_
-
-Notes
-=====
-
-If you're using Django 1.7+, you'll need to use the :python:`@deconstructible` decorator for your :python:`RichEnumValue` and :python:`OrderedRichEnumValue` classes so Django's migration framework knows how to serialize your :python:`RichEnumValue` and :python:`OrderedRichEnumValue`.
-
-.. code:: python
-
-    >>> from django.utils.deconstruct import deconstructible
-    >>> from richenum import RichEnumValue, OrderedRichEnumValue
-    >>> @deconstructible
-    ... class CustomRichEnumValue(RichEnumValue):
-    ...     pass
-    ...
-    >>> @deconstructible
-    ... class CustomOrderedRichEnumValue(OrderedRichEnumValue):
-    ...     pass
-    ...
-
-Contributing
-============
-
-#. Fork the repo from `GitHub <https://github.com/hearsaycorp/django-richenum>`_.
-#. Make your changes.
-#. Add unittests for your changes.
-#. Run `pep8 <https://pypi.python.org/pypi/pep8>`_, `pyflakes <https://pypi.python.org/pypi/pyflakes>`_, and `pylint <https://pypi.python.org/pypi/pyflakes>`_ to make sure your changes follow the Python style guide and doesn't have any errors.
-#. Add yourself to the AUTHORS file (in alphabetical order).
-#. Send a pull request from your fork to the main repo.
diff --git a/build.sh b/build.sh
deleted file mode 100755
index f0fb26c..0000000
--- a/build.sh
+++ /dev/null
@@ -1,9 +0,0 @@
-#!/usr/bin/env sh
-
-# Safer to update these separately.
-pip install -U "setuptools"
-pip install -U "wheel"
-pip install -U "pip"
-
-./setup.py sdist
-./setup.py bdist_wheel
diff --git a/poetry.lock b/poetry.lock
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index 0000000..0383768
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+]
+
+[[package]]
+name = "tomlkit"
+version = "0.13.3"
+description = "Style preserving TOML library"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "tomlkit-0.13.3-py3-none-any.whl", hash = "sha256:c89c649d79ee40629a9fda55f8ace8c6a1b42deb912b2a8fd8d942ddadb606b0"},
+    {file = "tomlkit-0.13.3.tar.gz", hash = "sha256:430cf247ee57df2b94ee3fbe588e71d362a941ebb545dec29b53961d61add2a1"},
+]
+
+[[package]]
+name = "typing-extensions"
+version = "4.13.2"
+description = "Backported and Experimental Type Hints for Python 3.8+"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "typing_extensions-4.13.2-py3-none-any.whl", hash = "sha256:a439e7c04b49fec3e5d3e2beaa21755cadbbdc391694e28ccdd36ca4a1408f8c"},
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+]
+
+[[package]]
+name = "tzdata"
+version = "2025.3"
+description = "Provider of IANA time zone data"
+optional = false
+python-versions = ">=2"
+files = [
+    {file = "tzdata-2025.3-py2.py3-none-any.whl", hash = "sha256:06a47e5700f3081aab02b2e513160914ff0694bce9947d6b76ebd6bf57cfc5d1"},
+    {file = "tzdata-2025.3.tar.gz", hash = "sha256:de39c2ca5dc7b0344f2eba86f49d614019d29f060fc4ebc8a417896a620b56a7"},
+]
+
+[metadata]
+lock-version = "2.0"
+python-versions = ">=3.8,<4.0"
+content-hash = "2d54cdf3913723c555e2c7b5b182cc7f6d18662ecc34f1bc4c5907e400047fcb"
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..a0caca6
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,38 @@
+[tool.poetry]
+name = "django-richenum"
+version = "5.1.0"
+description = "Django Enum library for python."
+authors = ["Hearsay Social <opensource@hearsaysocial.com>"]
+license = "MIT"
+readme = ["README.md", "CHANGELOG.md"]
+homepage = "https://github.com/hearsaycorp/django-richenum"
+repository = "https://github.com/hearsaycorp/django-richenum"
+keywords = ["python", "django", "enum", "richenum"]
+classifiers = [
+    "Development Status :: 5 - Production/Stable",
+    "License :: OSI Approved :: MIT License",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: Implementation :: CPython",
+]
+packages = [{ include = "django_richenum", from = "src" }]
+include = ["LICENSE.txt", "AUTHORS.md", "CHANGELOG.md"]
+
+[tool.poetry.dependencies]
+python = ">=3.8,<4.0"
+Django = ">=3.2,<4.3"
+richenum = "*"
+
+[tool.poetry.group.dev.dependencies]
+pytest = "*"
+pytest-django = "*"
+flake8 = "*"
+pylint = "*"
+mysqlclient = "*"
+psycopg2-binary = "*"
+
+[build-system]
+requires = ["poetry-core>=1.1.0"]
+build-backend = "poetry.core.masonry.api"
diff --git a/setup.py b/setup.py
deleted file mode 100755
index 5a41a14..0000000
--- a/setup.py
+++ /dev/null
@@ -1,115 +0,0 @@
-#!/usr/bin/env python
-import os
-import sys
-
-from setuptools import find_packages
-from setuptools import setup
-from setuptools.command.test import test as TestCommand
-
-tests_require = (
-    'pytest>=6.2.5,<7.5',
-    'pytest-django',
-)
-
-
-install_requires = (
-    'Django>=3.2,<4.3',
-    'richenum',
-)
-
-
-class DjangoTest(TestCommand):
-    DIRNAME = os.path.dirname(__file__)
-    APPS = ('tests',)
-
-    def finalize_options(self):
-        TestCommand.finalize_options(self)
-        self.test_args = []
-        self.test_suite = True
-
-    def run_tests(self):
-        import django
-        import pytest
-        from django.conf import settings
-
-        db_host = os.environ.get('DJANGO_DB_HOST')
-        db_engine = os.environ.get('DJANGO_DB_ENGINE', 'sqlite')
-        db_user = os.environ.get('DJANGO_DB_USER')
-        db_pass = os.environ.get('DJANGO_DB_PASSWORD')
-
-        if db_engine == 'mysql':
-            db_settings = {
-                'ENGINE': 'django.db.backends.mysql',
-                'NAME': 'testdb',
-                'USER': db_user or 'root',
-                'HOST': db_host,
-                'PASSWORD': db_pass
-            }
-        elif db_engine == 'postgres':
-            db_settings = {
-                'ENGINE': 'django.db.backends.postgresql_psycopg2',
-                'NAME': 'testdb',
-                'USER': db_user or 'postgres',
-                'HOST': db_host,
-                'PASSWORD': db_pass
-            }
-        elif db_engine == 'sqlite':
-            db_settings = {
-                'ENGINE': 'django.db.backends.sqlite3',
-                'NAME': os.path.join(self.DIRNAME, 'database.db'),
-            }
-        else:
-            raise ValueError("Unknown DB engine: %s" % db_engine)
-
-        settings.configure(
-            DEBUG=True,
-            DATABASES={'default': db_settings},
-            SECRET_KEY=os.environ.get('SECRET_KEY'),
-            CACHES={
-                'default': {
-                    'BACKEND': 'django.core.cache.backends.dummy.DummyCache'
-                }
-            },
-            MIDDLEWARE_CLASSES=['django.middleware.common.CommonMiddleware'],
-            INSTALLED_APPS=(
-                # Default Django apps from settings template
-                # https://github.com/django/django/blob/2.1/django/conf/project_template/project_name/settings.py-tpl
-                'django.contrib.admin',
-                'django.contrib.auth',
-                'django.contrib.contenttypes',
-                'django.contrib.sessions',
-                'django.contrib.messages',
-                'django.contrib.staticfiles') + self.APPS)
-
-        django.setup()
-        sys.exit(pytest.main(["tests/"]))
-
-
-setup(
-    name='django-richenum',
-    version='5.0.0',
-    description='Django Enum library for python.',
-    long_description=(
-        open('README.rst').read() + '\n\n' +
-        open('CHANGELOG.rst').read() + '\n\n' +
-        open('AUTHORS.rst').read()),
-    classifiers=[
-        'Development Status :: 5 - Production/Stable',
-        'License :: OSI Approved :: MIT License',
-        'Programming Language :: Python :: 3.8',
-        'Programming Language :: Python :: 3.9',
-        'Programming Language :: Python :: 3.10',
-        'Programming Language :: Python :: 3.11',
-        'Programming Language :: Python :: Implementation :: CPython',
-    ],
-    keywords='python django enum richenum',
-    url='https://github.com/hearsaycorp/django-richenum',
-    author='Hearsay Social',
-    author_email='opensource@hearsaysocial.com',
-    license='MIT',
-    package_dir={'': 'src'},
-    packages=find_packages('src'),
-    install_requires=install_requires,
-    tests_require=tests_require,
-    cmdclass={'test': DjangoTest},
-)
diff --git a/tests/run_tests.py b/tests/run_tests.py
new file mode 100644
index 0000000..4510b61
--- /dev/null
+++ b/tests/run_tests.py
@@ -0,0 +1,74 @@
+#!/usr/bin/env python3
+import os
+import sys
+
+
+REPO_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+SRC_ROOT = os.path.join(REPO_ROOT, "src")
+
+
+def _db_settings():
+    db_host = os.environ.get("DJANGO_DB_HOST")
+    db_engine = os.environ.get("DJANGO_DB_ENGINE", "sqlite")
+    db_user = os.environ.get("DJANGO_DB_USER")
+    db_pass = os.environ.get("DJANGO_DB_PASSWORD")
+
+    if db_engine == "mysql":
+        return {
+            "ENGINE": "django.db.backends.mysql",
+            "NAME": "testdb",
+            "USER": db_user or "root",
+            "HOST": db_host,
+            "PASSWORD": db_pass,
+        }
+    if db_engine == "postgres":
+        return {
+            "ENGINE": "django.db.backends.postgresql_psycopg2",
+            "NAME": "testdb",
+            "USER": db_user or "postgres",
+            "HOST": db_host,
+            "PASSWORD": db_pass,
+        }
+    if db_engine == "sqlite":
+        return {
+            "ENGINE": "django.db.backends.sqlite3",
+            "NAME": os.path.join(REPO_ROOT, "database.db"),
+        }
+
+    raise ValueError(f"Unknown DB engine: {db_engine}")
+
+
+def main():
+    if REPO_ROOT not in sys.path:
+        sys.path.insert(0, REPO_ROOT)
+    if SRC_ROOT not in sys.path:
+        sys.path.insert(0, SRC_ROOT)
+
+    import django
+    import pytest
+    from django.conf import settings
+
+    if not settings.configured:
+        settings.configure(
+            DEBUG=True,
+            DATABASES={"default": _db_settings()},
+            SECRET_KEY=os.environ.get("SECRET_KEY", "placeholder"),
+            CACHES={"default": {"BACKEND": "django.core.cache.backends.dummy.DummyCache"}},
+            MIDDLEWARE_CLASSES=["django.middleware.common.CommonMiddleware"],
+            INSTALLED_APPS=(
+                "django.contrib.admin",
+                "django.contrib.auth",
+                "django.contrib.contenttypes",
+                "django.contrib.sessions",
+                "django.contrib.messages",
+                "django.contrib.staticfiles",
+                "tests",
+            ),
+        )
+
+    django.setup()
+    return pytest.main(["tests/"])
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/tox.ini b/tox.ini
deleted file mode 100644
index 96d1236..0000000
--- a/tox.ini
+++ /dev/null
@@ -1,47 +0,0 @@
-[tox]
-envlist = {py38,py39,py310}-django{320,400,410,420}-{sqlite,mysql,postgres},lint
-
-[gh-actions]
-python =
-    3.8: py38
-    3.9: py39
-    3.10: py310
-    3.11: py311
-
-[testenv]
-deps =
-    django320: Django>=3.2,<3.3
-    django400: Django>=3.3,<4.1
-    django410: Django>=4.1,<4.2
-    django420: Django>=4.2,<4.3
-    pytest>=6.2.5,<7.5
-    pytest-django
-    mysqlclient
-    psycopg2
-skip_missing_interpreters=true
-setenv =
-    mysql: DJANGO_DB_HOST = 127.0.0.1
-    mysql: DJANGO_DB_ENGINE = mysql
-    mysql: DJANGO_DB_USER = travis
-    mysql: DJANGO_DB_PASSWORD = travis
-    sqlite: DJANGO_DB_ENGINE = sqlite
-    postgres: DJANGO_DB_HOST = 127.0.0.1
-    postgres: DJANGO_DB_ENGINE = postgres
-    postgres: DJANGO_DB_USER = travis
-    postgres: DJANGO_DB_PASSWORD = travis
-    SECRET_KEY = placeholder # required env variable for django>=3.2
-
-commands =
-    python setup.py test
-
-[testenv:lint]
-deps = 
-    flake8 
-    pytest
-    pylint
-    setuptools
-commands =
-    flake8 tests src setup.py
-    pylint --rcfile=pylint.rc src/django_richenum
-    pylint --rcfile=pylint.rc tests
-    pylint --rcfile=pylint.rc setup.py