diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
new file mode 100644
index 0000000..e656eab
--- /dev/null
+++ b/.github/CODEOWNERS
@@ -0,0 +1 @@
+* @Coding-Cuddles/kata-maintainers
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..2b49354
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,12 @@
+version: 2
+
+updates:
+  - package-ecosystem: "uv"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 798d5cf..7343182 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -11,49 +11,40 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - name: Checkout
-        uses: actions/checkout@v3
+      - uses: actions/checkout@v7
 
-      - name: Install poetry
-        run: pipx install poetry
-
-      - name: Set up Python
-        uses: actions/setup-python@v4
+      - uses: actions/setup-python@v7
         with:
-          python-version: '3.8'
-          cache: 'poetry'
+          python-version: "3.11"
 
-      - name: Install dependencies
-        run: poetry install
+      - uses: astral-sh/setup-uv@v9.0.0
+        with:
+          version: "latest"
+          prune-cache: true
 
       - name: Check formatting
-        run: |
-          source $(poetry env info --path)/bin/activate
-          make format-check
+        run: make format-check
 
   test:
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
 
     steps:
-      - name: Checkout
-        uses: actions/checkout@v3
+      - uses: actions/checkout@v7
 
-      - name: Install poetry
-        run: pipx install poetry
-
-      - name: Set up Python
-        uses: actions/setup-python@v4
+      - uses: actions/setup-python@v7
         with:
-          python-version: '3.8'
-          cache: 'poetry'
+          python-version: "3.11"
 
-      - name: Install dependencies
-        run: poetry install
+      - uses: astral-sh/setup-uv@v9.0.0
+        with:
+          version: "latest"
+          prune-cache: true
 
       - name: Run main
         run: make run
 
       - name: Test
-        run: |
-          source $(poetry env info --path)/bin/activate
-          make test
+        run: make test
diff --git a/.replit b/.replit
deleted file mode 100644
index ddce839..0000000
--- a/.replit
+++ /dev/null
@@ -1,19 +0,0 @@
-run = ["make", "test"]
-language = "python3"
-entrypoint = "main.py"
-hidden = ["LICENSE", "venv", ".config", ".gitignore", "**/__pycache__", "**/.pytest_cache", "**/*.pyc"]
-
-[nix]
-channel = "stable-21_11"
-
-[languages]
-
-[languages.python3]
-pattern = "**/*.py"
-
-[languages.python3.languageServer]
-start = "pylsp"
-
-[debugger]
-support = false
-
diff --git a/Makefile b/Makefile
index c7c588a..e05c904 100644
--- a/Makefile
+++ b/Makefile
@@ -1,28 +1,43 @@
-all: test
+COLOR_CYAN := \033[36m
+COLOR_RESET := \033[0m
 
-SRCS := $(shell git ls-files *.py)
+SRCS := $(shell git ls-files '*.py')
+
+.DEFAULT_GOAL := help
+
+.PHONY: all
+all: test ## Run tests
+
+.PHONY: help
+help: ## Show this help message
+	@awk 'BEGIN {FS = ":.*##"; printf "Usage: make [options] $(COLOR_CYAN)[target] ...$(COLOR_RESET)\n\n"} \
+	/^[a-zA-Z_-]+:.*##/ {printf "  $(COLOR_CYAN)%-20s$(COLOR_RESET) %s\n", $$1, $$2}' \
+		$(MAKEFILE_LIST)
 
 .PHONY: run
-run:
-	./main.py
+run: ## Run the main entry point
+	uv run python main.py
 
 .PHONY: test
-test:
-	pytest test_*.py
+test: ## Run tests
+	uv run pytest test_*.py
 
 .PHONY: format
-format:
-	yapf -i $(SRCS)
+format: ## Format Python sources in place
+	uv run ruff format $(SRCS)
 
 .PHONY: format-check
-format-check:
-	yapf --diff $(SRCS) \
+format-check: ## Fail if Python sources require formatting
+	uv run ruff format --check $(SRCS) \
 		|| (echo "Some files require formatting. Run 'make format' to fix." && exit 1)
 
 .PHONY: clean
-clean:
-	git clean -Xfd
+clean: ## Remove generated caches
+	find . \( -path ./.git -o -path ./.venv -o -path ./venv \) -prune \
+		-o -type d -name __pycache__ -exec rm -rf {} +
+	rm -rf .pytest_cache .ruff_cache
+	rm -f .coverage .coverage.*
 
-ifndef VERBOSE
+ifneq ($(VERBOSE),1)
 .SILENT:
 endif
diff --git a/README.md b/README.md
index ddbb649..86ecc1d 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,8 @@
 # Roman numerals kata in Python
 
 [![CI](https://github.com/Coding-Cuddles/roman-numerals-python-kata/actions/workflows/main.yml/badge.svg)](https://github.com/Coding-Cuddles/roman-numerals-python-kata/actions/workflows/main.yml)
-[![Replit](https://img.shields.io/badge/Try%20with%20Replit-black?logo=replit)](https://replit.com/new/github/Coding-Cuddles/roman-numerals-python-kata)
+[![Python 3.11+](https://img.shields.io/badge/python-3.11%2B-blue.svg)](https://www.python.org/downloads/)
+[![License: MIT](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
 
 ## Overview
 
@@ -61,24 +62,97 @@ their corresponding Arabic digits.
 * If you do know an algorithm, evaluate if it can be implemented using strict
   TDD principles.
 
-## Usage
+## Prerequisites
 
-You can import this project into [Replit](https://replit.com), and it will
-handle all dependencies automatically.
+Required:
 
-### Prerequisites
+- [Git](https://git-scm.com/downloads)
+- [uv](https://docs.astral.sh/uv/getting-started/installation/)
 
-* [Python 3.8+](https://www.python.org/)
-* [pytest](https://pytest.org)
+Optional:
 
-### Run main
+- [GNU Make](https://www.gnu.org/software/make/), for shorter commands. Every required task also
+  has a direct `uv` command.
+
+You do not need to install Python or pytest separately. `uv` installs a compatible Python version
+and the locked project dependencies when needed.
+
+## Set up the kata
+
+1. Clone the repository:
+
+   ```console
+   git clone https://github.com/Coding-Cuddles/roman-numerals-python-kata.git
+   ```
+
+2. Enter the repository directory:
+
+   ```console
+   cd roman-numerals-python-kata
+   ```
+
+3. Run the existing test. Use Make when it is installed:
+
+   ```console
+   make test
+   ```
+
+   Otherwise, run pytest through `uv` directly:
+
+   ```console
+   uv run pytest test_*.py
+   ```
+
+   The first run may install Python and the project dependencies. Setup is complete when pytest
+   reports `1 passed`.
+
+   If the command fails with `uv: command not found`, install
+   [uv](https://docs.astral.sh/uv/getting-started/installation/) and repeat this step.
+
+## Work on the kata
+
+1. Add the next behavior to `test_roman_numerals.py`, then implement it in `roman_numerals.py`.
+
+2. Run the tests after each change. Use Make when it is installed:
+
+   ```console
+   make test
+   ```
+
+   Otherwise, run pytest through `uv` directly:
+
+   ```console
+   uv run pytest test_*.py
+   ```
+
+   Continue when the test run passes.
+
+## Run the entry point
+
+The repository retains `main.py` as its command-line entry point. Use Make when it is installed:
 
 ```console
 make run
 ```
 
-### Run tests
+Otherwise, run it through `uv` directly:
 
 ```console
-make test
+uv run python main.py
 ```
+
+The command prints `Hello World!`.
+
+## Make command reference
+
+Make is optional. Run `make` or `make help` to list these commands in the terminal.
+
+| Command             | Result                                  |
+| ------------------- | --------------------------------------- |
+| `make all`          | Run the test suite                      |
+| `make help`         | List public Make targets                |
+| `make run`          | Run `main.py`                           |
+| `make test`         | Run the test suite                      |
+| `make format`       | Format tracked Python files             |
+| `make format-check` | Check formatting without changing files |
+| `make clean`        | Remove generated caches                 |
diff --git a/poetry.lock b/poetry.lock
deleted file mode 100644
index f1500b8..0000000
--- a/poetry.lock
+++ /dev/null
@@ -1,276 +0,0 @@
-[[package]]
-name = "attrs"
-version = "22.1.0"
-description = "Classes Without Boilerplate"
-category = "dev"
-optional = false
-python-versions = ">=3.5"
-
-[package.extras]
-dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "mypy (>=0.900,!=0.940)", "pytest-mypy-plugins", "zope.interface", "furo", "sphinx", "sphinx-notfound-page", "pre-commit", "cloudpickle"]
-docs = ["furo", "sphinx", "zope.interface", "sphinx-notfound-page"]
-tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "mypy (>=0.900,!=0.940)", "pytest-mypy-plugins", "zope.interface", "cloudpickle"]
-tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "mypy (>=0.900,!=0.940)", "pytest-mypy-plugins", "cloudpickle"]
-
-[[package]]
-name = "colorama"
-version = "0.4.6"
-description = "Cross-platform colored terminal text."
-category = "dev"
-optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
-
-[[package]]
-name = "exceptiongroup"
-version = "1.0.3"
-description = "Backport of PEP 654 (exception groups)"
-category = "dev"
-optional = false
-python-versions = ">=3.7"
-
-[package.extras]
-test = ["pytest (>=6)"]
-
-[[package]]
-name = "iniconfig"
-version = "1.1.1"
-description = "iniconfig: brain-dead simple config-ini parsing"
-category = "dev"
-optional = false
-python-versions = "*"
-
-[[package]]
-name = "jedi"
-version = "0.18.1"
-description = "An autocompletion tool for Python that can be used for text editors."
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[package.dependencies]
-parso = ">=0.8.0,<0.9.0"
-
-[package.extras]
-qa = ["flake8 (==3.8.3)", "mypy (==0.782)"]
-testing = ["Django (<3.1)", "colorama", "docopt", "pytest (<7.0.0)"]
-
-[[package]]
-name = "packaging"
-version = "21.3"
-description = "Core utilities for Python packages"
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[package.dependencies]
-pyparsing = ">=2.0.2,<3.0.5 || >3.0.5"
-
-[[package]]
-name = "parso"
-version = "0.8.3"
-description = "A Python Parser"
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[package.extras]
-qa = ["flake8 (==3.8.3)", "mypy (==0.782)"]
-testing = ["docopt", "pytest (<6.0.0)"]
-
-[[package]]
-name = "pluggy"
-version = "1.0.0"
-description = "plugin and hook calling mechanisms for python"
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[package.extras]
-dev = ["pre-commit", "tox"]
-testing = ["pytest", "pytest-benchmark"]
-
-[[package]]
-name = "pyflakes"
-version = "2.5.0"
-description = "passive checker of Python programs"
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[[package]]
-name = "pyparsing"
-version = "3.0.9"
-description = "pyparsing module - Classes and methods to define and execute parsing grammars"
-category = "dev"
-optional = false
-python-versions = ">=3.6.8"
-
-[package.extras]
-diagrams = ["railroad-diagrams", "jinja2"]
-
-[[package]]
-name = "pytest"
-version = "7.2.0"
-description = "pytest: simple powerful testing with Python"
-category = "dev"
-optional = false
-python-versions = ">=3.7"
-
-[package.dependencies]
-attrs = ">=19.2.0"
-colorama = {version = "*", markers = "sys_platform == \"win32\""}
-exceptiongroup = {version = ">=1.0.0rc8", markers = "python_version < \"3.11\""}
-iniconfig = "*"
-packaging = "*"
-pluggy = ">=0.12,<2.0"
-tomli = {version = ">=1.0.0", markers = "python_version < \"3.11\""}
-
-[package.extras]
-testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.7.2)", "requests", "xmlschema"]
-
-[[package]]
-name = "python-lsp-jsonrpc"
-version = "1.0.0"
-description = "JSON RPC 2.0 server library"
-category = "dev"
-optional = false
-python-versions = "*"
-
-[package.dependencies]
-ujson = ">=3.0.0"
-
-[package.extras]
-test = ["pylint", "pycodestyle", "pyflakes", "pytest", "pytest-cov", "coverage"]
-
-[[package]]
-name = "pytoolconfig"
-version = "1.2.2"
-description = "Python tool configuration"
-category = "dev"
-optional = false
-python-versions = ">=3.7"
-
-[package.dependencies]
-packaging = ">=21.3"
-tomli = {version = ">=2.0", markers = "python_version < \"3.11\""}
-
-[package.extras]
-doc = ["tabulate (>=0.8.9)", "sphinx (>=4.5.0)"]
-gen_docs = ["sphinx (>=4.5.0)", "sphinx-autodoc-typehints (>=1.18.1)", "sphinx-rtd-theme (>=1.0.0)", "pytoolconfig"]
-global = ["appdirs (>=1.4.4)"]
-validation = ["pydantic (>=1.7.4)"]
-
-[[package]]
-name = "replit-python-lsp-server"
-version = "1.15.9"
-description = "Python Language Server for the Language Server Protocol"
-category = "dev"
-optional = false
-python-versions = ">=3.7"
-
-[package.dependencies]
-jedi = ">=0.17.2,<0.19.0"
-pluggy = ">=1.0.0"
-pyflakes = {version = ">=2.5.0,<2.6.0", optional = true, markers = "extra == \"pyflakes\""}
-python-lsp-jsonrpc = ">=1.0.0"
-rope = {version = ">0.10.5", optional = true, markers = "extra == \"rope\""}
-toml = ">=0.10.2"
-ujson = ">=3.0.0"
-whatthepatch = {version = ">=1.0.2,<2.0.0", optional = true, markers = "extra == \"yapf\""}
-yapf = {version = "*", optional = true, markers = "extra == \"yapf\""}
-
-[package.extras]
-all = ["autopep8 (>=1.6.0,<1.7.0)", "flake8 (>=5.0.0,<5.1.0)", "mccabe (>=0.7.0,<0.8.0)", "pycodestyle (>=2.9.0,<2.10.0)", "pydocstyle (>=2.0.0)", "pyflakes (>=2.5.0,<2.6.0)", "pylint (>=2.5.0)", "rope (>=0.10.5)", "yapf", "whatthepatch"]
-autopep8 = ["autopep8 (>=1.6.0,<1.7.0)"]
-flake8 = ["flake8 (>=5.0.0,<5.1.0)"]
-mccabe = ["mccabe (>=0.7.0,<0.8.0)"]
-pycodestyle = ["pycodestyle (>=2.9.0,<2.10.0)"]
-pydocstyle = ["pydocstyle (>=2.0.0)"]
-pyflakes = ["pyflakes (>=2.5.0,<2.6.0)"]
-pylint = ["pylint (>=2.5.0)"]
-rope = ["rope (>0.10.5)"]
-test = ["pylint (>=2.5.0)", "pytest", "pytest-cov", "coverage", "numpy (<1.23)", "pandas", "matplotlib", "pyqt5", "flaky"]
-websockets = ["websockets (>=10.3)"]
-yapf = ["yapf", "whatthepatch (>=1.0.2,<2.0.0)"]
-
-[[package]]
-name = "rope"
-version = "1.4.0"
-description = "a python refactoring library..."
-category = "dev"
-optional = false
-python-versions = ">=3.7"
-
-[package.dependencies]
-pytoolconfig = ">=1.2.2"
-
-[package.extras]
-dev = ["pytest (>=7.0.1)", "pytest-timeout (>=2.1.0)", "build (>=0.7.0)"]
-doc = ["pytoolconfig", "sphinx (>=4.5.0)", "sphinx-autodoc-typehints (>=1.18.1)", "sphinx-rtd-theme (>=1.0.0)"]
-
-[[package]]
-name = "toml"
-version = "0.10.2"
-description = "Python Library for Tom's Obvious, Minimal Language"
-category = "dev"
-optional = false
-python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
-
-[[package]]
-name = "tomli"
-version = "2.0.1"
-description = "A lil' TOML parser"
-category = "dev"
-optional = false
-python-versions = ">=3.7"
-
-[[package]]
-name = "ujson"
-version = "5.5.0"
-description = "Ultra fast JSON encoder and decoder for Python"
-category = "dev"
-optional = false
-python-versions = ">=3.7"
-
-[[package]]
-name = "whatthepatch"
-version = "1.0.3"
-description = "A patch parsing and application library."
-category = "dev"
-optional = false
-python-versions = ">=3.7"
-
-[[package]]
-name = "yapf"
-version = "0.32.0"
-description = "A formatter for Python code."
-category = "dev"
-optional = false
-python-versions = "*"
-
-[metadata]
-lock-version = "1.1"
-python-versions = ">=3.8.0"
-content-hash = "34b2796708ecda4150baa477583b7a57bfe007fd248124afc12c8976c0546e19"
-
-[metadata.files]
-attrs = []
-colorama = []
-exceptiongroup = []
-iniconfig = []
-jedi = []
-packaging = []
-parso = []
-pluggy = []
-pyflakes = []
-pyparsing = []
-pytest = []
-python-lsp-jsonrpc = []
-pytoolconfig = []
-replit-python-lsp-server = []
-rope = []
-toml = []
-tomli = []
-ujson = []
-whatthepatch = []
-yapf = []
diff --git a/pyproject.toml b/pyproject.toml
index 1bf25bc..dbaa064 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,16 +1,23 @@
-[tool.poetry]
+[project]
 name = "roman-numerals-python-kata"
 version = "1.0.0"
 description = "Roman numerals kata in Python"
-authors = ["Codding Cuddles"]
+authors = [{ name = "Codding Cuddles" }]
+requires-python = ">=3.11"
 
-[tool.poetry.dependencies]
-python = ">=3.8.0"
+dependencies = [
+    "pytest>=9.1.1"
+]
 
-[tool.poetry.dev-dependencies]
-pytest = "^7.2.0"
-replit-python-lsp-server = {extras = ["yapf", "rope", "pyflakes"], version = "^1.15.9"}
+[dependency-groups]
+dev = [
+    "ruff>=0.16.1"
+]
 
-[build-system]
-requires = ["poetry-core>=1.0.0"]
-build-backend = "poetry.core.masonry.api"
+[tool.ruff]
+target-version = "py311"
+line-length = 100
+
+[tool.ruff.format]
+quote-style = "double"
+indent-style = "space"
diff --git a/replit.nix b/replit.nix
deleted file mode 100644
index 56778e4..0000000
--- a/replit.nix
+++ /dev/null
@@ -1,17 +0,0 @@
-{ pkgs }: {
-  deps = [
-    pkgs.python38Full
-    pkgs.python38Packages.pytest
-  ];
-  env = {
-    PYTHON_LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath [
-      # Needed for pandas / numpy
-      pkgs.stdenv.cc.cc.lib
-      pkgs.zlib
-      # Needed for matplotlib
-      pkgs.xorg.libX11
-    ];
-    PYTHONBIN = "${pkgs.python38Full}/bin/python3.8";
-    LANG = "en_US.UTF-8";
-  };
-}
diff --git a/uv.lock b/uv.lock
new file mode 100644
index 0000000..7e29de8
--- /dev/null
+++ b/uv.lock
@@ -0,0 +1,108 @@
+version = 1
+revision = 3
+requires-python = ">=3.11"
+
+[[package]]
+name = "colorama"
+version = "0.4.6"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/d8/53/6f443c9a4a8358a93a6792e2acffb9d9d5cb0a5cfd8802644b7b1c9a02e4/colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44", size = 27697, upload-time = "2022-10-25T02:36:22.414Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/d1/d6/3965ed04c63042e047cb6a3e6ed1a63a35087b6a609aa3a15ed8ac56c221/colorama-0.4.6-py2.py3-none-any.whl", hash = "sha256:4f1d9991f5acc0ca119f9d443620b77f9d6b33703e51011c16baf57afb285fc6", size = 25335, upload-time = "2022-10-25T02:36:20.889Z" },
+]
+
+[[package]]
+name = "iniconfig"
+version = "2.3.0"
+source = { registry = "https://pypi.org/simple" }
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