diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
new file mode 100644
index 00000000..2e9f5cd4
--- /dev/null
+++ b/.github/workflows/publish.yml
@@ -0,0 +1,23 @@
+name: Publish
+
+on:
+  release:
+    types: [ created ]
+
+jobs:
+  run:
+    name: "Build and publish release"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v3
+        with:
+          version: "0.8.10"
+
+      - run: uv python install 3.12
+      - run: uv build
+      - run: uv publish
+        env:
+            UV_PUBLISH_TOKEN: ${{ secrets.PYPI_API_TOKEN }}
diff --git a/.github/workflows/vrplib.yml b/.github/workflows/vrplib.yml
index 4025b8f7..ac5c3b5b 100644
--- a/.github/workflows/vrplib.yml
+++ b/.github/workflows/vrplib.yml
@@ -5,68 +5,46 @@ on:
     branches: [ main ]
   pull_request:
     branches: [ main ]
-  release:
-    types: [created]
-
 
 jobs:
   build:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [ '3.9', '3.10', '3.11', '3.12' ]
+        python-version: [ '3.10', '3.11', '3.12', '3.13' ]
     steps:
       - uses: actions/checkout@v4
-      - name: Set up Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: ${{ matrix.python-version }}
-      - name: Update pip and poetry
-        run: |
-          python -m pip install --upgrade pip
-          pip install poetry
-      - name: Cache Python dependencies
-        uses: actions/cache@v4
-        id: cache-python
+
+      - name: Install the latest version of uv
+        uses: astral-sh/setup-uv@v6
         with:
-          path: ~/.cache/pypoetry
-          key: python-${{ env.pythonLocation }}-${{ hashFiles('pyproject.toml') }}
-      - name: Install Python dependencies
-        if: steps.cache-python.outputs.cache-hit != 'true'
-        run: poetry install
+          version: "0.8.10"
+          enable-cache: true
+
+      - name: Install Python version
+        run: uv python install ${{ matrix.python-version }}
+
+      - name: Install the project
+        run: uv sync
+
       - name: Cache pre-commit
         uses: actions/cache@v4
         id: cache-pre-commit
         with:
           path: ~/.cache/pre-commit/
-          key: pre-commit-${{ env.pythonLocation }}-${{ hashFiles('.pre-commit-config.yaml') }}
+          key: pre-commit-${{ matrix.python-version }}-${{ hashFiles('.pre-commit-config.yaml') }}
+
       - name: Install pre-commit
         if: steps.cache-pre-commit.outputs.cache-hit != 'true'
-        run: poetry run pre-commit install --install-hooks
+        run: uv run pre-commit install --install-hooks
+
       - name: Run pre-commit
-        run: poetry run pre-commit run --all-files
-      - name: Run pytest
-        run: poetry run pytest
-      - uses: codecov/codecov-action@v3
+        run: uv run pre-commit run --all-files
+
+      - name: Run tests
+        run: uv run pytest
+
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v3
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
-
-  deploy:
-    needs: build
-    if: github.event_name == 'release' && github.event.action == 'created'
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: Set up Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: 3.9
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install poetry
-      - name: Deploy to PyPI
-        run: |
-          poetry config pypi-token.pypi ${{ secrets.PYPI_TOKEN }}
-          poetry build
-          poetry publish
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index c7a4f506..3ccde1de 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,25 +1,20 @@
 fail_fast: true
 
 repos:
--   repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.4.0
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v6.0.0
     hooks:
-    -   id: debug-statements
-        id: trailing-whitespace
-        id: end-of-file-fixer
+      - id: debug-statements
+      - id: end-of-file-fixer
 
--   repo: https://github.com/psf/black
-    rev: 23.3.0
+  - repo: https://github.com/charliermarsh/ruff-pre-commit
+    rev: v0.12.8
     hooks:
-    -   id: black
+      - id: ruff
+        args: [--fix, --exit-non-zero-on-fix]
+      - id: ruff-format
 
--   repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: 'v0.0.261'
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: v1.17.1
     hooks:
-    -   id: ruff
-        args: [--fix]
-
--   repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.2.0
-    hooks:
-    -   id: mypy
+      - id: mypy
diff --git a/README.md b/README.md
index 79f54e27..550a6285 100644
--- a/README.md
+++ b/README.md
@@ -108,25 +108,6 @@ Vehicle types: [1, 2, 3]
 ```
 
 
-### Downloading from CVRPLIB 
-
-> [!WARNING]  
-> This functionality is deprecated and will be removed in the next major version.
-
-``` python
-import vrplib
-
-# Download an instance and a solution file 
-vrplib.download_instance("X-n101-k25", "/path/to/instances/")
-vrplib.download_solution("X-n101-k25", "/path/to/solutions/")
-
-# List all instance names that can be downloaded 
-vrplib.list_names()                      # All instance names
-vrplib.list_names(low=100, high=200)     # Instances with between [100, 200] customers
-vrplib.list_names(vrp_type="cvrp")       # Only CVRP instances
-vrplib.list_names(vrp_type="vrptw")      # Only VRPTW instances
-```
-
 
 ## Documentation
 - [VRPLIB instance format](#vrplib-instance-format)
@@ -246,6 +227,5 @@ Reading the above example solution returns the following dictionary:
 ```
 
 ### Other remarks
-- The `XML100` benchmark set is not listed in `list_names` and cannot be downloaded through this package. You can download these instances directly from [CVRPLIB](http://vrp.atd-lab.inf.puc-rio.br/index.php/en/).
 - In the literature, some instances use rounding conventions different from what is specified in the instance. For example, X instance set proposed by [Uchoa et al. (2017)](http://vrp.atd-lab.inf.puc-rio.br/index.php/en/new-instances) assumes that the distances are rounded to the nearest integer. When you use the `vrplib` package to read this instance, it will return non-rounded Euclidean distances because the instance specifies the `EUC_2D` edge weight type which implies no rounding. To adhere to the convention used in the literature, you can manually round the distances matrix.
 - For large instances (>5000 customers) it's recommended to set the `compute_edge_weights` argument to `False` in `read_instance`.
diff --git a/poetry.lock b/poetry.lock
deleted file mode 100644
index 09b1349d..00000000
--- a/poetry.lock
+++ /dev/null
@@ -1,621 +0,0 @@
-# This file is automatically @generated by Poetry 1.8.0 and should not be changed by hand.
-
-[[package]]
-name = "certifi"
-version = "2024.8.30"
-description = "Python package for providing Mozilla's CA Bundle."
-optional = false
-python-versions = ">=3.6"
-files = [
-    {file = "certifi-2024.8.30-py3-none-any.whl", hash = "sha256:922820b53db7a7257ffbda3f597266d435245903d80737e34f8a45ff3e3230d8"},
-    {file = "certifi-2024.8.30.tar.gz", hash = "sha256:bec941d2aa8195e248a60b31ff9f0558284cf01a52591ceda73ea9afffd69fd9"},
-]
-
-[[package]]
-name = "cfgv"
-version = "3.4.0"
-description = "Validate configuration and produce human readable error messages."
-optional = false
-python-versions = ">=3.8"
-files = [
-    {file = "cfgv-3.4.0-py2.py3-none-any.whl", hash = "sha256:b7265b1f29fd3316bfcd2b330d63d024f2bfd8bcb8b0272f8e19a504856c48f9"},
-    {file = "cfgv-3.4.0.tar.gz", hash = "sha256:e52591d4c5f5dead8e0f673fb16db7949d2cfb3f7da4582893288f0ded8fe560"},
-]
-
-[[package]]
-name = "charset-normalizer"
-version = "3.4.0"
-description = "The Real First Universal Charset Detector. Open, modern and actively maintained alternative to Chardet."
-optional = false
-python-versions = ">=3.7.0"
-files = [
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-test = ["covdefaults (>=2.3)", "coverage (>=7.2.7)", "coverage-enable-subprocess (>=1)", "flaky (>=3.7)", "packaging (>=23.1)", "pytest (>=7.4)", "pytest-env (>=0.8.2)", "pytest-freezer (>=0.4.8)", "pytest-mock (>=3.11.1)", "pytest-randomly (>=3.12)", "pytest-timeout (>=2.1)", "setuptools (>=68)", "time-machine (>=2.10)"]
-
-[metadata]
-lock-version = "2.0"
-python-versions = "^3.9"
-content-hash = "45ec912f2551234863a75f338a4c7e0d77654a87b256a544e8c52e372532621d"
diff --git a/pyproject.toml b/pyproject.toml
index 8a08a2eb..f68ca405 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,52 +1,76 @@
-[tool.poetry]
+[project]
 name = "vrplib"
 version = "1.5.1"
 description = "Python library for reading and writing VRP instances."
-authors = ["Leon Lan <leon.lanyidong@gmail.com>"]
+authors = [
+    { name = "Leon Lan", email = "leon.lanyidong@gmail.com" },
+]
 license = "MIT"
+license-files = ["LICENSE.md"]
+keywords = [
+    "vehicle routing problem",
+    "benchmarking",
+]
+classifiers = [
+    "Intended Audience :: Developers",
+    "Intended Audience :: Science/Research",
+    "Development Status :: 5 - Production/Stable",
+    "Topic :: Software Development",
+    "Topic :: Scientific/Engineering",
+    "Programming Language :: Python :: 3",
+]
+requires-python = ">=3.10"
+dependencies = [
+    "numpy>=1.19.3; python_version < '3.12'",
+    "numpy>=1.26.0; python_version >= '3.12'",
+]
 readme = "README.md"
 repository = "https://github.com/PyVRP/VRPLIB"
 
-[tool.poetry.dependencies]
-python = "^3.9"
-numpy = ">=1.19.3"
 
-[tool.poetry.group.dev.dependencies]
-pytest = "^7.1.2"
-codecov = "^2.1.13"
-pytest-cov = "^4.0.0"
-pre-commit = "^2.19.0"
+[project.urls]
+source = "https://github.com/PyVRP/VRPLIB"
+issues = "https://github.com/PyVRP/VRPLIB/issues"
+
+
+[dependency-groups]
+dev = [
+    "pre-commit>=2.20.0",
+    "pytest>=7.1.2",
+    "pytest-cov>=6.1.1",
+    "codecov",
+]
+
 
 [build-system]
-requires = ["poetry-core>=1.0.0"]
-build-backend = "poetry.core.masonry.api"
+requires = ["uv_build>=0.8.10,<0.9.0"]
+build-backend = "uv_build"
 
-[tool.black]
-line-length = 79
 
-[tool.mypy]
-ignore_missing_imports = true
+[tool.uv.build-backend]
+module-name = "vrplib"
+module-root = ""
+
 
 [tool.ruff]
+line-length = 79
+
+
+[tool.ruff.lint]
 select = [
-    "E",  # pycodestyle errors
-    "W",  # pycodestyle warnings
-    "F",  # pyflakes
-    "I",  # isort
-    "C",  # flake8-comprehensions
-]
-ignore = [
-    "E501",  # line too long, handled by black
-    "C901",  # too complex
+    "E", "F", "I", "NPY", "PYI", "Q", "RET", "RSE", "RUF", "SLF", "SIM", "TC",
 ]
 
-[tool.ruff.per-file-ignores]
-"__init__.py" = ["F401"]
+
+[tool.mypy]
+ignore_missing_imports = true
+
 
 [tool.pytest.ini_options]
 addopts = "--cov=. --cov-report=xml"
 pythonpath = [".", "vrplib"]
 
+
 [tool.coverage.run]
 omit = [
     "tests/*",
diff --git a/tests/download/__init__.py b/tests/download/__init__.py
deleted file mode 100644
index e69de29b..00000000
diff --git a/tests/download/test_download_instance.py b/tests/download/test_download_instance.py
deleted file mode 100644
index 699be06f..00000000
--- a/tests/download/test_download_instance.py
+++ /dev/null
@@ -1,87 +0,0 @@
-import os
-
-import pytest
-from numpy.testing import assert_, assert_equal
-
-from vrplib import download_instance
-
-
-def test_deprecation_warning(tmp_path):
-    """
-    Checks if a deprecation warning is raised when the function is called.
-    """
-    with pytest.warns(DeprecationWarning):
-        download_instance("X-n101-k25", tmp_path / "tmp")
-
-
-@pytest.mark.filterwarnings("ignore:The function")
-def test_raise_invalid_name(tmp_path):
-    """
-    Raise an error if the passed-in name is invalid.
-    """
-    with pytest.raises(ValueError):
-        download_instance("invalid_name", tmp_path / "tmp")
-
-
-@pytest.mark.filterwarnings("ignore:The function")
-def test_download_vrplib_instance_file_name(tmp_path):
-    """
-    Tests if a VRPLIB instance is correctly downloaded from CVRPLIB
-    and saved to the passed-in file path.
-    """
-    name = "X-n101-k25"
-    fname = "random_file_name.txt"
-    file_path = tmp_path / fname
-
-    download_instance(name, file_path)
-    assert_(os.path.exists(file_path))
-
-    with open(file_path, "r") as fi:
-        actual = fi.read()
-
-    with open(f"tests/data/cvrplib/{name}.vrp", "r") as fi:
-        desired = fi.read()
-
-    assert_equal(actual, desired)
-
-
-@pytest.mark.filterwarnings("ignore:The function")
-def test_download_vrplib_instance_dir_path(tmp_path):
-    """
-    Tests if a VRPLIB instance is correctly downloaded from CVRPLIB
-    and saved to the passed-in directory.
-    """
-    name = "X-n101-k25"
-    dir_path = tmp_path
-    file_path = dir_path / (name + ".vrp")
-
-    download_instance(name, dir_path)
-    assert_(os.path.exists(file_path))
-
-    with open(file_path, "r") as fi:
-        actual = fi.read()
-
-    with open(f"tests/data/cvrplib/{name}.vrp", "r") as fi:
-        desired = fi.read()
-
-    assert_equal(actual, desired)
-
-
-@pytest.mark.filterwarnings("ignore:The function")
-def test_download_solomon_instance(tmp_path):
-    """
-    Tests if a Solomon instance is correctly downloaded from CVRPLIB.
-    """
-    name = "C101"
-    ext = ".txt"
-    loc = tmp_path / (name + ext)
-
-    download_instance(name, loc)
-
-    with open(loc, "r") as fi:
-        actual = fi.read()
-
-    with open(f"tests/data/cvrplib/{name + ext}", "r") as fi:
-        desired = fi.read()
-
-    assert_equal(actual, desired)
diff --git a/tests/download/test_download_solution.py b/tests/download/test_download_solution.py
deleted file mode 100644
index f11c5573..00000000
--- a/tests/download/test_download_solution.py
+++ /dev/null
@@ -1,93 +0,0 @@
-import os
-
-import pytest
-from numpy.testing import assert_, assert_equal, assert_raises
-
-from vrplib import download_solution
-
-
-def test_deprecation_warning(tmp_path):
-    """
-    Checks if a deprecation warning is raised when the function is called.
-    """
-    with pytest.warns(DeprecationWarning):
-        download_solution("X-n101-k25", tmp_path / "tmp")
-
-
-@pytest.mark.filterwarnings("ignore:The function")
-def test_raise_invalid_name(tmp_path):
-    """
-    Raise an error if the passed-in name is invalid.
-    """
-    with assert_raises(ValueError):
-        download_solution("invalid_name", tmp_path / "tmp")
-
-
-@pytest.mark.filterwarnings("ignore:The function")
-def test_download_vrplib_solution_file_name_path(tmp_path):
-    """
-    Tests if a VRPLIB solution is correctly downloaded from CVRPLIB
-    and saved to the passed-in file path.
-    """
-    name = "X-n101-k25"
-    fname = "random_file_name.txt"
-    file_path = tmp_path / fname
-
-    download_solution(name, file_path)
-    assert_(os.path.exists(file_path))
-
-    with open(file_path, "r") as fi:
-        actual = fi.read()
-
-    # The best known solution is known to be optimal, so the solution
-    # file in the repository will not be outdated.
-    with open(f"tests/data/cvrplib/{name}.sol", "r") as fi:
-        desired = fi.read()
-
-    assert_equal(actual, desired)
-
-
-@pytest.mark.filterwarnings("ignore:The function")
-def test_download_vrplib_solution_dir_path(tmp_path):
-    """
-    Tests if a VRPLIB solution is correctly downloaded from CVRPLIB
-    and saved to the passed-in directory.
-    """
-    name = "X-n101-k25"
-    dir_path = tmp_path
-    file_path = dir_path / (name + ".sol")
-
-    download_solution(name, dir_path)
-    assert_(os.path.exists(file_path))
-
-    with open(file_path, "r") as fi:
-        actual = fi.read()
-
-    # The best known solution is known to be optimal, so the solution
-    # file in the repository will not be outdated.
-    with open(f"tests/data/cvrplib/{name}.sol", "r") as fi:
-        desired = fi.read()
-
-    assert_equal(actual, desired)
-
-
-@pytest.mark.filterwarnings("ignore:The function")
-def test_download_solomon_solution(tmp_path):
-    """
-    Tests if a Solomon solution is correctly downloaded from CVRPLIB.
-    """
-    name = "C101"
-    ext = ".sol"
-    loc = tmp_path / (name + ext)
-
-    download_solution(name, loc)
-
-    with open(loc, "r") as fi:
-        actual = fi.read()
-
-    # The best known solution is known to be optimal, so the solution
-    # file in the repository will not be outdated.
-    with open(f"tests/data/cvrplib/{name + ext}", "r") as fi:
-        desired = fi.read()
-
-    assert_equal(actual, desired)
diff --git a/tests/download/test_download_utils.py b/tests/download/test_download_utils.py
deleted file mode 100644
index 6a41d0d0..00000000
--- a/tests/download/test_download_utils.py
+++ /dev/null
@@ -1,16 +0,0 @@
-import pytest
-from numpy.testing import assert_equal
-
-from vrplib.download.download_utils import find_set
-
-from ..utils import selected_cases
-
-
-@pytest.mark.parametrize("case", selected_cases())
-def test_find_dir(case):
-    assert_equal(find_set(case.instance_name), case.set_name)
-
-
-def test_raise_invalid_name():
-    with pytest.raises(ValueError):
-        find_set("test_name")
diff --git a/tests/download/test_list_names.py b/tests/download/test_list_names.py
deleted file mode 100644
index bae8c1a8..00000000
--- a/tests/download/test_list_names.py
+++ /dev/null
@@ -1,54 +0,0 @@
-import pytest
-from numpy.testing import assert_
-
-from vrplib import list_names
-
-from ..utils import selected_cases
-
-
-def test_deprecationg_warning():
-    """
-    Check if the deprecation warning is raised.
-    """
-    with pytest.warns(DeprecationWarning):
-        list_names(1, 2, "cvrp")
-
-
-@pytest.mark.filterwarnings("ignore:The function")
-@pytest.mark.parametrize("case", selected_cases())
-def test_list_names(case):
-    assert_(case.instance_name in list_names())
-
-
-@pytest.mark.filterwarnings("ignore:The function")
-@pytest.mark.parametrize(
-    "low, high, vrp_type",
-    [
-        (1, 2, "vrp"),  # vrp not in [None, 'cvrp', 'vrptw']
-    ],
-)
-def test_list_names_raise(low, high, vrp_type):
-    """
-    Raise for invalid input paramaters.
-    """
-    with pytest.raises(ValueError):
-        list_names(low, high, vrp_type)
-
-
-@pytest.mark.filterwarnings("ignore:The function")
-@pytest.mark.parametrize(
-    "name, low, high, vrp_type",
-    [
-        ("A-n32-k5", 31, 31, "cvrp"),
-        ("ORTEC-n242-k12", 0, 241, "cvrp"),
-        ("Flanders2", 30000, None, "cvrp"),
-        ("X-n101-k25", 0, 100, None),
-        ("RC208", 0, 100, "vrptw"),
-        ("RC2_10_10", 1000, 1000, None),
-    ],
-)
-def test_list_names_n(name, low, high, vrp_type):
-    """
-    Check if the passed-in name is in the list of names.
-    """
-    assert_(name in list_names(low, high, vrp_type))
diff --git a/tests/parse/test_parse_solomon.py b/tests/parse/test_parse_solomon.py
index 6b7e0bd0..86677c6e 100644
--- a/tests/parse/test_parse_solomon.py
+++ b/tests/parse/test_parse_solomon.py
@@ -26,9 +26,8 @@
     ],
 )
 def test_raise_invalid_solomon_instance_file(name):
-    with assert_raises(RuntimeError):
-        with open(DATA_DIR / name, "r") as fh:
-            parse_solomon(fh.read())
+    with open(DATA_DIR / name, "r") as fh, assert_raises(RuntimeError):
+        parse_solomon(fh.read())
 
 
 @mark.parametrize(
@@ -43,8 +42,14 @@ def test_raise_invalid_solomon_instance_file(name):
         # no CUSTOMER in fifth line
         ["NAME", "VEHICLES", "NUMBER CAPACITY", "20 100", "wrong"],
         # missing headers in sixth line
-        ["NAME", "VEHICLES", "NUMBER CAPACITY", "20 100", "wrong"]
-        + ["CUST NO. XCOORD. YCOORD. DEMAND"],
+        [
+            "NAME",
+            "VEHICLES",
+            "NUMBER CAPACITY",
+            "20 100",
+            "wrong",
+            "CUST NO. XCOORD. YCOORD. DEMAND",
+        ],
     ],
 )
 def test_raise_invalid_solomon_instance_lines(lines):
diff --git a/tests/parse/test_parse_vrplib.py b/tests/parse/test_parse_vrplib.py
index 0c040c13..8daef486 100644
--- a/tests/parse/test_parse_vrplib.py
+++ b/tests/parse/test_parse_vrplib.py
@@ -27,9 +27,8 @@ def test_raise_invalid_vrplib_format(name):
     """
     Tests if a RuntimeError is raised when the text is not in VRPLIB format.
     """
-    with open(DATA_DIR / name, "r") as fh:
-        with assert_raises(RuntimeError):
-            parse_vrplib(fh.read())
+    with open(DATA_DIR / name, "r") as fh, assert_raises(RuntimeError):
+        parse_vrplib(fh.read())
 
 
 @mark.parametrize(
diff --git a/tests/utils.py b/tests/utils.py
deleted file mode 100644
index b6557460..00000000
--- a/tests/utils.py
+++ /dev/null
@@ -1,79 +0,0 @@
-from dataclasses import dataclass
-from pathlib import Path
-
-from vrplib.download.download_utils import find_set
-
-CVRPLIB_DATA_DIR = Path("tests/data/cvrplib/")
-
-
-@dataclass
-class Case:
-    name: str
-    set_name: str
-    instance_name: str
-    instance_path: str
-    solution_path: str
-    dimension: int
-    capacity: int
-    cost: float
-
-
-def make_case(
-    set_name,
-    instance_name,
-    dimension,
-    capacity,
-    cost,
-):
-    """
-    Return a test case based on the passed-in arguments.
-    """
-    return Case(
-        name=set_name + "/" + instance_name,
-        set_name=set_name,
-        instance_name=instance_name,
-        instance_path=CVRPLIB_DATA_DIR
-        / (
-            instance_name
-            + (
-                ".txt"
-                if find_set(instance_name) in ["Solomon", "HG"]
-                else ".vrp"
-            )
-        ),
-        solution_path=CVRPLIB_DATA_DIR / (instance_name + ".sol"),
-        dimension=dimension,
-        capacity=capacity,
-        cost=cost,
-    )
-
-
-def selected_cases():
-    """
-    A selection of test cases.
-    """
-    A = make_case("A", "A-n32-k5", 32, 100, 784)
-    B = make_case("B", "B-n31-k5", 31, 100, 672)
-    C = make_case("CMT", "CMT6", 51, 160, 555.43)
-    D = make_case("D", "ORTEC-n242-k12", 242, 125, 123750)
-    E = make_case("E", "E-n13-k4", 13, 6000, 247)
-    F = make_case("F", "F-n72-k4", 72, 30000, 237)
-    G = make_case("Golden", "Golden_1", 241, 550, 5623.47)
-    L = make_case("Li", "Li_21", 561, 1200, 16212.82548)
-    M = make_case("M", "M-n101-k10", 101, 200, 820)
-    P = make_case("P", "P-n16-k8", 16, 35, 450)
-    X = make_case("X", "X-n101-k25", 101, 206, 27591)
-
-    return [
-        A,
-        B,
-        C,
-        D,
-        E,
-        F,
-        G,
-        L,
-        M,
-        P,
-        X,
-    ]
diff --git a/vrplib/__init__.py b/vrplib/__init__.py
index 380fe7ad..71545ed6 100644
--- a/vrplib/__init__.py
+++ b/vrplib/__init__.py
@@ -1,3 +1,4 @@
-from .download import download_instance, download_solution, list_names
-from .read import read_instance, read_solution
-from .write import write_instance, write_solution
+from .read import read_instance as read_instance
+from .read import read_solution as read_solution
+from .write import write_instance as write_instance
+from .write import write_solution as write_solution
diff --git a/vrplib/download/__init__.py b/vrplib/download/__init__.py
deleted file mode 100644
index 0fe0917e..00000000
--- a/vrplib/download/__init__.py
+++ /dev/null
@@ -1,3 +0,0 @@
-from .download_instance import download_instance
-from .download_solution import download_solution
-from .list_names import list_names
diff --git a/vrplib/download/constants.py b/vrplib/download/constants.py
deleted file mode 100644
index 62b036e8..00000000
--- a/vrplib/download/constants.py
+++ /dev/null
@@ -1,25 +0,0 @@
-CVRPLIB_URL = "http://vrp.atd-lab.inf.puc-rio.br/media/com_vrp/instances/"
-
-
-CVRP_SETS = [
-    "A",
-    "B",
-    "E",
-    "F",
-    "M",
-    "P",
-    "CMT",
-    "tai",
-    "Golden",
-    "Li",
-    "X",
-    "XXL",
-]
-
-VRPTW_SETS = [
-    "Solomon",
-    "HG",
-]
-
-XXL_NAMES = ["Antwerp", "Brussels", "Flanders", "Ghent", "Leuven"]
-DIMACS_NAMES = ["Loggi", "ORTEC"]
diff --git a/vrplib/download/download_instance.py b/vrplib/download/download_instance.py
deleted file mode 100644
index 7120c845..00000000
--- a/vrplib/download/download_instance.py
+++ /dev/null
@@ -1,41 +0,0 @@
-import os
-import warnings
-from pathlib import Path
-from typing import Union
-from urllib.request import urlopen
-
-from .constants import CVRPLIB_URL
-from .download_utils import find_set, is_vrptw
-
-
-def download_instance(name: str, path: Union[str, os.PathLike]):
-    """
-    Downloads an instance file from CVRPLIB and saves it at the specified path.
-
-    Parameters
-    ----------
-    name
-        The name of the instance to download. Should be one of the names
-        listed in `vrplib.list_instances()`.
-    path
-        The path where the instance file should be saved. If a directory is
-        specified, the file will be saved in that directory with the original
-        file name.
-    """
-    msg = (
-        "The function 'download_instance' is deprecated and will be removed"
-        " in the next major version (vrplib v2.0.0)."
-    )
-    warnings.warn(msg, DeprecationWarning)
-
-    ext = "txt" if is_vrptw(name) else "vrp"
-    url = CVRPLIB_URL + f"{find_set(name)}/{name}.{ext}"
-    response = urlopen(url, timeout=30)
-
-    instance_text = response.read().decode("utf-8")
-
-    if os.path.isdir(path):
-        path = Path(path) / f"{name}.{ext}"
-
-    with open(path, "w") as fi:
-        fi.write(instance_text)
diff --git a/vrplib/download/download_solution.py b/vrplib/download/download_solution.py
deleted file mode 100644
index ef4c639b..00000000
--- a/vrplib/download/download_solution.py
+++ /dev/null
@@ -1,40 +0,0 @@
-import os
-import warnings
-from pathlib import Path
-from typing import Union
-from urllib.request import urlopen
-
-from .constants import CVRPLIB_URL
-from .download_utils import find_set
-
-
-def download_solution(name: str, path: Union[str, os.PathLike]):
-    """
-    Downloads a solution file from CVRPLIB and saves it at the specified path.
-
-    Parameters
-    ----------
-    name
-        The name of the instance to download. Should be one of the names
-        listed in `vrplib.list_instances`.
-    path
-        The path where the solution file should be saved. If a directory is
-        specified, the file will be saved in that directory with the original
-        file name.
-    """
-    msg = (
-        "The function 'download_solution' is deprecated and will be removed"
-        " in the next major version (vrplib v2.0.0)."
-    )
-    warnings.warn(msg, DeprecationWarning)
-
-    url = CVRPLIB_URL + f"{find_set(name)}/{name}.sol"
-    response = urlopen(url, timeout=30)
-
-    solution_text = response.read().decode("utf-8")
-
-    if os.path.isdir(path):
-        path = Path(path) / f"{name}.sol"
-
-    with open(path, "w") as fi:
-        fi.write(solution_text)
diff --git a/vrplib/download/download_utils.py b/vrplib/download/download_utils.py
deleted file mode 100644
index e2da7faf..00000000
--- a/vrplib/download/download_utils.py
+++ /dev/null
@@ -1,43 +0,0 @@
-import re
-
-from .constants import CVRP_SETS, DIMACS_NAMES, XXL_NAMES
-
-
-def find_set(instance_name: str) -> str:
-    """
-    Find the set name of the instance.
-
-    Notes
-    -----
-    - VRPTW instances start with "C, R, RC" directly followed by 1 or 2.
-        HG instances have underscores ("_") in the name, whereas Solomon
-        instances do not.
-    - CVRP instance names and their corresponding set names share the same
-        first letter. the exceptions are XXL and DIMACS instances, which have
-        unique instance names
-    """
-    if re.match("(R|C|RC)[12]", instance_name):
-        if "_" in instance_name:
-            return "HG"
-        else:
-            return "Solomon"
-
-    if any([instance_name.startswith(xxl) for xxl in XXL_NAMES]):
-        return "XXL"
-
-    if any([instance_name.startswith(dimacs) for dimacs in DIMACS_NAMES]):
-        return "D"
-
-    for set_name in CVRP_SETS:
-        if instance_name.startswith(set_name):
-            return set_name
-
-    raise ValueError(f"Set name not known for instance: {instance_name}.")
-
-
-def is_vrptw(name: str) -> bool:
-    """
-    Checks if the passed-in name is a VRPTW instance or not. Otherwise the
-    instance is a CVRP instance.
-    """
-    return find_set(name) in ["HG", "Solomon"]
diff --git a/vrplib/download/instance_data.csv b/vrplib/download/instance_data.csv
deleted file mode 100644
index 20759ab5..00000000
--- a/vrplib/download/instance_data.csv
+++ /dev/null
@@ -1,631 +0,0 @@
-A-n32-k5,31,5,100,784,yes
-A-n33-k5,32,5,100,661,yes
-A-n33-k6,32,6,100,742,yes
-A-n34-k5,33,5,100,778,yes
-A-n36-k5,35,5,100,799,yes
-A-n37-k5,36,5,100,669,yes
-A-n37-k6,36,6,100,949,yes
-A-n38-k5,37,5,100,730,yes
-A-n39-k5,38,5,100,822,yes
-A-n39-k6,38,6,100,831,yes
-A-n44-k6,43,6,100,937,yes
-A-n45-k6,44,6,100,944,yes
-A-n45-k7,44,7,100,1146,yes
-A-n46-k7,45,7,100,914,yes
-A-n48-k7,47,7,100,1073,yes
-A-n53-k7,52,7,100,1010,yes
-A-n54-k7,53,7,100,1167,yes
-A-n55-k9,54,9,100,1073,yes
-A-n60-k9,59,9,100,1354,yes
-A-n61-k9,60,9,100,1034,yes
-A-n62-k8,61,8,100,1288,yes
-A-n63-k9,62,9,100,1616,yes
-A-n63-k10,62,10,100,1314,yes
-A-n64-k9,63,9,100,1401,yes
-A-n65-k9,64,9,100,1174,yes
-A-n69-k9,68,9,100,1159,yes
-A-n80-k10,79,10,100,1763,yes
-B-n31-k5,30,5,100,672,yes
-B-n34-k5,33,5,100,788,yes
-B-n35-k5,34,5,100,955,yes
-B-n38-k6,37,6,100,805,yes
-B-n39-k5,38,5,100,549,yes
-B-n41-k6,40,6,100,829,yes
-B-n43-k6,42,6,100,742,yes
-B-n44-k7,43,7,100,909,yes
-B-n45-k5,44,5,100,751,yes
-B-n45-k6,44,6,100,678,yes
-B-n50-k7,49,7,100,741,yes
-B-n50-k8,49,8,100,1312,yes
-B-n51-k7,50,7,100,1032,yes
-B-n52-k7,51,7,100,747,yes
-B-n56-k7,55,7,100,707,yes
-B-n57-k7,56,7,100,1153,yes
-B-n57-k9,56,9,100,1598,yes
-B-n63-k10,62,10,100,1496,yes
-B-n64-k9,63,9,100,861,yes
-B-n66-k9,65,9,100,1316,yes
-B-n67-k10,66,10,100,1032,yes
-B-n68-k9,67,9,100,1272,yes
-B-n78-k10,77,10,100,1221,yes
-E-n13-k4,12,4,6000,247,yes
-E-n22-k4,21,4,6000,375,yes
-E-n23-k3,22,3,4500,569,yes
-E-n30-k3,29,3,4500,534,yes
-E-n31-k7,30,7,140,379,yes
-E-n33-k4,32,4,8000,835,yes
-E-n51-k5,50,5,160,521,yes
-E-n76-k7,75,7,220,682,yes
-E-n76-k8,75,8,180,735,yes
-E-n76-k10,75,10,140,830,yes
-E-n76-k14,75,14,100,1021,yes
-E-n101-k8,100,8,200,815,yes
-E-n101-k14,100,14,112,1067,yes
-F-n45-k4,44,4,2010,724,yes
-F-n72-k4,71,4,30000,237,yes
-F-n135-k7,134,7,2210,1162,yes
-M-n101-k10,100,10,200,820,yes
-M-n121-k7,120,7,200,1034,yes
-M-n151-k12,150,12,200,1015,yes
-M-n200-k16,199,16,200,1274,yes
-M-n200-k17,199,17,200,1275,yes
-P-n16-k8,15,8,35,450,yes
-P-n19-k2,18,2,160,212,yes
-P-n20-k2,19,2,160,216,yes
-P-n21-k2,20,2,160,211,yes
-P-n22-k2,21,2,160,216,yes
-P-n22-k8,21,8,3000,603,yes
-P-n23-k8,22,8,40,529,yes
-P-n40-k5,39,5,140,458,yes
-P-n45-k5,44,5,150,510,yes
-P-n50-k7,49,7,150,554,yes
-P-n50-k8,49,8,120,631,yes
-P-n50-k10,49,10,100,696,yes
-P-n51-k10,50,10,80,741,yes
-P-n55-k7,54,7,170,568,yes
-P-n55-k10,54,10,115,694,yes
-P-n55-k15,54,15,70,989,yes
-P-n60-k10,59,10,120,744,yes
-P-n60-k15,59,15,80,968,yes
-P-n65-k10,64,10,130,792,yes
-P-n70-k10,69,10,135,827,yes
-P-n76-k4,75,4,350,593,yes
-P-n76-k5,75,5,280,627,yes
-P-n101-k4,100,4,400,681,yes
-CMT1,50,5,160,524.61,yes
-CMT2,75,10,140,835.26,yes
-CMT3,100,8,200,826.14,yes
-CMT4,150,12,200,1028.42,yes
-CMT5,199,17,200,1291.29,yes
-CMT6,50,6,160,555.43,yes
-CMT7,75,11,140,909.68,yes
-CMT8,100,9,200,865.94,yes
-CMT9,150,14,200,1162.55,yes
-CMT10,199,18,200,1395.85,yes
-CMT11,120,7,200,1042.12,yes
-CMT12,100,10,200,819.56,yes
-CMT13,120,11,200,1541.14,yes
-CMT14,100,11,200,866.37,yes
-tai75a,75,10,1445,1618.36,yes
-tai75b,75,9,1679,1344.62,yes
-tai75c,75,9,1122,1291.01,yes
-tai75d,75,9,1699,1365.42,yes
-tai100a,100,11,1409,2041.34,yes
-tai100b,100,11,1842,1939.9,yes
-tai100c,100,11,2043,1406.2,yes
-tai100d,100,11,1297,1580.46,yes
-tai150a,150,15,1544,3055.23,yes
-tai150b,150,14,1918,2727.03,yes
-tai150c,150,14,2021,2358.66,yes
-tai150d,150,14,1874,2645.39,yes
-tai385,385,46,65,24366.41,no
-Golden_1,240,9,550,5623.47,no
-Golden_2,320,10,700,8404.61,no
-Golden_3,400,9,900,10997.8,no
-Golden_4,480,10,1000,13588.6,no
-Golden_5,200,5,900,6460.98,no
-Golden_6,280,7,900,8400.33,no
-Golden_7,360,8,900,10102.7,no
-Golden_8,440,10,900,11635.3,no
-Golden_9,255,14,1000,579.7,no
-Golden_10,323,16,1000,735.43,no
-Golden_11,399,17,1000,911.98,no
-Golden_12,483,19,1000,1100.67,no
-Golden_13,252,26,1000,857.19,yes
-Golden_14,320,29,1000,1080.55,yes
-Golden_15,396,33,1000,1337.27,no
-Golden_16,480,36,1000,1611.28,no
-Golden_17,240,22,200,707.76,yes
-Golden_18,300,27,200,995.13,yes
-Golden_19,360,33,200,1365.6,yes
-Golden_20,420,38,200,1817.59,yes
-Li_21,560,10,1200,16212.83,no
-Li_22,600,15,900,14499.04,no
-Li_23,640,10,1400,18801.13,no
-Li_24,720,10,1500,21389.43,no
-Li_25,760,19,900,16665.7,no
-Li_26,800,10,1700,23977.73,no
-Li_27,840,20,900,17320,no
-Li_28,880,10,1800,26566.03,no
-Li_29,960,10,2000,29154.34,no
-Li_30,1040,10,2100,31742.64,no
-Li_31,1120,10,2300,34330.94,no
-Li_32,1200,11,2500,37159.41,no
-X-n101-k25,100,25,206,27591,yes
-X-n106-k14,105,14,600,26362,yes
-X-n110-k13,109,13,66,14971,yes
-X-n115-k10,114,10,169,12747,yes
-X-n120-k6,119,6,21,13332,yes
-X-n125-k30,124,30,188,55539,yes
-X-n129-k18,128,18,39,28940,yes
-X-n134-k13,133,13,643,10916,yes
-X-n139-k10,138,10,106,13590,yes
-X-n143-k7,142,7,1190,15700,yes
-X-n148-k46,147,46,18,43448,yes
-X-n153-k22,152,22,144,21220,yes
-X-n157-k13,156,13,12,16876,yes
-X-n162-k11,161,11,1174,14138,yes
-X-n167-k10,166,10,133,20557,yes
-X-n172-k51,171,51,161,45607,yes
-X-n176-k26,175,26,142,47812,yes
-X-n181-k23,180,23,8,25569,yes
-X-n186-k15,185,15,974,24145,yes
-X-n190-k8,189,8,138,16980,yes
-X-n195-k51,194,51,181,44225,yes
-X-n200-k36,199,36,402,58578,yes
-X-n204-k19,203,19,836,19565,yes
-X-n209-k16,208,16,101,30656,yes
-X-n214-k11,213,11,944,10856,yes
-X-n219-k73,218,73,3,117595,yes
-X-n223-k34,222,34,37,40437,yes
-X-n228-k23,227,23,154,25742,yes
-X-n233-k16,232,16,631,19230,yes
-X-n237-k14,236,14,18,27042,yes
-X-n242-k48,241,48,28,82751,yes
-X-n247-k50,246,47,134,37274,yes
-X-n251-k28,250,28,69,38684,yes
-X-n256-k16,255,16,1225,18839,yes
-X-n261-k13,260,13,1081,26558,yes
-X-n266-k58,265,58,35,75478,yes
-X-n270-k35,269,35,585,35291,yes
-X-n275-k28,274,28,10,21245,yes
-X-n280-k17,279,17,192,33503,no
-X-n284-k15,283,15,109,20215,yes
-X-n289-k60,288,60,267,95151,yes
-X-n294-k50,293,50,285,47161,no
-X-n298-k31,297,31,55,34231,yes
-X-n303-k21,302,21,794,21736,no
-X-n308-k13,307,13,246,25859,no
-X-n313-k71,312,71,248,94043,no
-X-n317-k53,316,53,6,78355,yes
-X-n322-k28,321,28,868,29834,yes
-X-n327-k20,326,20,128,27532,no
-X-n331-k15,330,15,23,31102,yes
-X-n336-k84,335,84,203,139111,no
-X-n344-k43,343,43,61,42050,no
-X-n351-k40,350,40,436,25896,no
-X-n359-k29,358,29,68,51505,no
-X-n367-k17,366,17,218,22814,no
-X-n376-k94,375,94,4,147713,yes
-X-n384-k52,383,52,564,65928,no
-X-n393-k38,392,38,78,38260,yes
-X-n401-k29,400,29,745,66154,no
-X-n411-k19,410,19,216,19712,no
-X-n420-k130,419,130,18,107798,yes
-X-n429-k61,428,61,536,65449,no
-X-n439-k37,438,37,12,36391,yes
-X-n449-k29,448,29,777,55233,no
-X-n459-k26,458,26,1106,24139,no
-X-n469-k138,468,138,256,221824,yes
-X-n480-k70,479,70,52,89449,no
-X-n491-k59,490,59,428,66483,no
-X-n502-k39,501,39,13,69226,no
-X-n513-k21,512,21,142,24201,no
-X-n524-k153,523,137,125,154593,yes
-X-n536-k96,535,96,371,94846,no
-X-n548-k50,547,50,11,86700,yes
-X-n561-k42,560,42,74,42717,no
-X-n573-k30,572,30,210,50673,no
-X-n586-k159,585,159,28,190316,no
-X-n599-k92,598,92,487,108451,no
-X-n613-k62,612,62,523,59535,no
-X-n627-k43,626,43,110,62164,no
-X-n641-k35,640,35,1381,63682,no
-X-n655-k131,654,131,5,106780,yes
-X-n670-k130,669,126,129,146332,no
-X-n685-k75,684,75,408,68205,no
-X-n701-k44,700,44,87,81923,no
-X-n716-k35,715,35,1007,43373,no
-X-n733-k159,732,159,25,136187,no
-X-n749-k98,748,98,396,77269,no
-X-n766-k71,765,71,166,114417,no
-X-n783-k48,782,48,832,72386,no
-X-n801-k40,800,40,20,73305,no
-X-n819-k171,818,171,358,158121,no
-X-n837-k142,836,142,44,193737,no
-X-n856-k95,855,95,9,88965,yes
-X-n876-k59,875,59,764,99299,no
-X-n895-k37,894,37,1816,53860,no
-X-n916-k207,915,207,33,329179,no
-X-n936-k151,935,151,138,132715,no
-X-n957-k87,956,87,11,85465,no
-X-n979-k58,978,58,998,118976,no
-X-n1001-k43,1000,43,131,72355,no
-Antwerp1,6000,,30,477277,no
-Antwerp2,7000,,100,291350,no
-Brussels1,15000,,50,501719,no
-Brussels2,16000,,150,345481,no
-Flanders1,20000,,50,7240124,no
-Flanders2,30000,,200,4373320,no
-Ghent1,10000,,35,469531,no
-Ghent2,11000,,170,257748,no
-Leuven1,3000,,25,192848,no
-Leuven2,4000,,150,111391,no
-Loggi-n401-k23,400,23,100,336903,no
-Loggi-n501-k24,500,24,120,177176,no
-Loggi-n601-k19,600,19,180,113155,no
-Loggi-n601-k42,600,42,80,347059,no
-Loggi-n901-k42,900,42,120,246301,no
-Loggi-n1001-k31,1000,31,180,284356,no
-ORTEC-n242-k12,241,12,125,123750,no
-ORTEC-n323-k21,322,21,100,214071,no
-ORTEC-n405-k18,404,18,160,200986,no
-ORTEC-n455-k41,454,41,70,292485,no
-ORTEC-n510-k23,509,23,145,184529,no
-ORTEC-n701-k64,700,64,80,445543,no
-C101,100,,200,827.3,yes
-C102,100,,200,827.3,yes
-C103,100,,200,826.3,yes
-C104,100,,200,822.9,yes
-C105,100,,200,827.3,yes
-C106,100,,200,827.3,yes
-C107,100,,200,827.3,yes
-C108,100,,200,827.3,yes
-C109,100,,200,827.3,yes
-C201,100,,700,589.1,yes
-C202,100,,700,589.1,yes
-C203,100,,700,588.7,yes
-C204,100,,700,588.1,yes
-C205,100,,700,586.4,yes
-C206,100,,700,586,yes
-C207,100,,700,585.8,yes
-C208,100,,700,585.8,yes
-R101,100,,200,1637.7,yes
-R102,100,,200,1466.6,yes
-R103,100,,200,1208.7,yes
-R104,100,,200,971.5,yes
-R105,100,,200,1355.3,yes
-R106,100,,200,1234.6,yes
-R107,100,,200,1064.6,yes
-R108,100,,200,932.1,yes
-R109,100,,200,1146.9,yes
-R110,100,,200,1068,yes
-R111,100,,200,1048.7,yes
-R112,100,,200,948.6,yes
-R201,100,,1000,1143.2,yes
-R202,100,,1000,1029.6,yes
-R203,100,,1000,870.8,yes
-R204,100,,1000,731.3,yes
-R205,100,,1000,949.8,yes
-R206,100,,1000,875.9,yes
-R207,100,,1000,794,yes
-R208,100,,1000,701,yes
-R209,100,,1000,854.8,yes
-R210,100,,1000,900.5,yes
-R211,100,,1000,746.7,yes
-RC101,100,,200,1619.8,yes
-RC102,100,,200,1457.4,yes
-RC103,100,,200,1258,yes
-RC104,100,,200,1132.3,yes
-RC105,100,,200,1513.7,yes
-RC106,100,,200,1372.7,yes
-RC107,100,,200,1207.8,yes
-RC108,100,,200,1114.2,yes
-RC201,100,,1000,1261.8,yes
-RC202,100,,1000,1092.3,yes
-RC203,100,,1000,923.7,yes
-RC204,100,,1000,783.5,yes
-RC205,100,,1000,1154,yes
-RC206,100,,1000,1051.1,yes
-RC207,100,,1000,962.9,yes
-RC208,100,,1000,776.1,yes
-C1_2_1,200,,200,2698.6,yes
-C1_2_2,200,,200,2694.3,yes
-C1_2_3,200,,200,2675.8,yes
-C1_2_4,200,,200,2625.6,yes
-C1_2_5,200,,200,2694.9,yes
-C1_2_6,200,,200,2694.9,yes
-C1_2_7,200,,200,2694.9,yes
-C1_2_8,200,,200,2684,yes
-C1_2_9,200,,200,2639.6,yes
-C1_2_10,200,,200,2624.7,yes
-C2_2_1,200,,700,1922.1,yes
-C2_2_2,200,,700,1851.4,yes
-C2_2_3,200,,700,1763.4,yes
-C2_2_4,200,,700,1695,no
-C2_2_5,200,,700,1869.6,yes
-C2_2_6,200,,700,1844.8,yes
-C2_2_7,200,,700,1842.2,yes
-C2_2_8,200,,700,1813.7,yes
-C2_2_9,200,,700,1815,yes
-C2_2_10,200,,700,1791.2,yes
-R1_2_1,200,,200,4667.2,yes
-R1_2_2,200,,200,3919.9,yes
-R1_2_3,200,,200,3373.9,yes
-R1_2_4,200,,200,3047.6,yes
-R1_2_5,200,,200,4053.2,yes
-R1_2_6,200,,200,3559.1,yes
-R1_2_7,200,,200,3141.9,yes
-R1_2_8,200,,200,2938.4,yes
-R1_2_9,200,,200,3734.7,yes
-R1_2_10,200,,200,3293.1,yes
-R2_2_1,200,,1000,3468,yes
-R2_2_2,200,,1000,3008.2,yes
-R2_2_3,200,,1000,2537.5,yes
-R2_2_4,200,,1000,1928.5,yes
-R2_2_5,200,,1000,3061.1,yes
-R2_2_6,200,,1000,2675.4,yes
-R2_2_7,200,,1000,2304.7,yes
-R2_2_8,200,,1000,1842.4,yes
-R2_2_9,200,,1000,2843.3,yes
-R2_2_10,200,,1000,2549.4,yes
-RC1_2_1,200,,200,3516.9,yes
-RC1_2_2,200,,200,3221.6,yes
-RC1_2_3,200,,200,3001.4,yes
-RC1_2_4,200,,200,2845.2,yes
-RC1_2_5,200,,200,3325.6,yes
-RC1_2_6,200,,200,3300.7,yes
-RC1_2_7,200,,200,3177.8,yes
-RC1_2_8,200,,200,3060,yes
-RC1_2_9,200,,200,3073.3,no
-RC1_2_10,200,,200,2990.5,no
-RC2_2_1,200,,1000,2797.4,yes
-RC2_2_2,200,,1000,2481.6,yes
-RC2_2_3,200,,1000,2227.7,yes
-RC2_2_4,200,,1000,1854.8,yes
-RC2_2_5,200,,1000,2491.4,yes
-RC2_2_6,200,,1000,2495.1,yes
-RC2_2_7,200,,1000,2287.7,yes
-RC2_2_8,200,,1000,2151.2,yes
-RC2_2_9,200,,1000,2086.6,yes
-RC2_2_10,200,,1000,1989.2,no
-C1_4_1,400,,200,7138.8,no
-C1_4_2,400,,200,7113.3,no
-C1_4_3,400,,200,6929.9,no
-C1_4_4,400,,200,6777.7,no
-C1_4_5,400,,200,7138.8,no
-C1_4_6,400,,200,7140.1,no
-C1_4_7,400,,200,7136.2,no
-C1_4_8,400,,200,7083,no
-C1_4_9,400,,200,6927.8,no
-C1_4_10,400,,200,6825.4,no
-C2_4_1,400,,700,4100.3,no
-C2_4_2,400,,700,3914.1,no
-C2_4_3,400,,700,3755.2,no
-C2_4_4,400,,700,3523.7,no
-C2_4_5,400,,700,3923.2,no
-C2_4_6,400,,700,3860.1,no
-C2_4_7,400,,700,3870.9,no
-C2_4_8,400,,700,3773.7,no
-C2_4_9,400,,700,3842.1,no
-C2_4_10,400,,700,3665.1,no
-R1_4_1,400,,200,10305.8,no
-R1_4_2,400,,200,8876,no
-R1_4_3,400,,200,7787.8,no
-R1_4_4,400,,200,7266.2,no
-R1_4_5,400,,200,9186,no
-R1_4_6,400,,200,8340.4,no
-R1_4_7,400,,200,7599.8,no
-R1_4_8,400,,200,7240.5,no
-R1_4_9,400,,200,8677.5,no
-R1_4_10,400,,200,8077.8,no
-R2_4_1,400,,1000,7520.7,no
-R2_4_2,400,,1000,6482.8,no
-R2_4_3,400,,1000,5372.9,no
-R2_4_4,400,,1000,4211.2,no
-R2_4_5,400,,1000,6567.9,no
-R2_4_6,400,,1000,5813.5,no
-R2_4_7,400,,1000,4893.5,no
-R2_4_8,400,,1000,4000.2,no
-R2_4_9,400,,1000,6067.8,no
-R2_4_10,400,,1000,5645.9,no
-RC1_4_1,400,,200,8524,no
-RC1_4_2,400,,200,7878.2,no
-RC1_4_3,400,,200,7516.9,no
-RC1_4_4,400,,200,7292.9,no
-RC1_4_5,400,,200,8153,no
-RC1_4_6,400,,200,8148,no
-RC1_4_7,400,,200,7932.5,no
-RC1_4_8,400,,200,7757.2,no
-RC1_4_9,400,,200,7717.7,no
-RC1_4_10,400,,200,7581.3,no
-RC2_4_1,400,,1000,6147.3,no
-RC2_4_2,400,,1000,5407.5,no
-RC2_4_3,400,,1000,4573,no
-RC2_4_4,400,,1000,3597.9,no
-RC2_4_5,400,,1000,5392.3,no
-RC2_4_6,400,,1000,5324.6,no
-RC2_4_7,400,,1000,4987.8,no
-RC2_4_8,400,,1000,4693.3,no
-RC2_4_9,400,,1000,4510.4,no
-RC2_4_10,400,,1000,4252.3,no
-C1_6_1,600,,200,14076.6,no
-C1_6_2,600,,200,13948.3,no
-C1_6_3,600,,200,13757,no
-C1_6_4,600,,200,13538.6,no
-C1_6_5,600,,200,14066.8,no
-C1_6_6,600,,200,14070.9,no
-C1_6_7,600,,200,14066.8,no
-C1_6_8,600,,200,13991.2,no
-C1_6_9,600,,200,13664.5,no
-C1_6_10,600,,200,13617.6,no
-C2_6_1,600,,700,7752.2,no
-C2_6_2,600,,700,7471.5,no
-C2_6_3,600,,700,7215,no
-C2_6_4,600,,700,6877.6,no
-C2_6_5,600,,700,7553.8,no
-C2_6_6,600,,700,7449.8,no
-C2_6_7,600,,700,7491.4,no
-C2_6_8,600,,700,7303.7,no
-C2_6_9,600,,700,7303.2,no
-C2_6_10,600,,700,7123.9,no
-R1_6_1,600,,200,21274.2,no
-R1_6_2,600,,200,18558.7,no
-R1_6_3,600,,200,16874.9,no
-R1_6_4,600,,200,15721.4,no
-R1_6_5,600,,200,19305.6,no
-R1_6_6,600,,200,17763.7,no
-R1_6_7,600,,200,16496.2,no
-R1_6_8,600,,200,15584.3,no
-R1_6_9,600,,200,18481.5,no
-R1_6_10,600,,200,17583.7,no
-R2_6_1,600,,1000,15145.3,no
-R2_6_2,600,,1000,12986.9,no
-R2_6_3,600,,1000,10455.3,no
-R2_6_4,600,,1000,7915.1,no
-R2_6_5,600,,1000,13794.1,no
-R2_6_6,600,,1000,11849.1,no
-R2_6_7,600,,1000,9777.9,no
-R2_6_8,600,,1000,7512.3,no
-R2_6_9,600,,1000,12741.9,no
-R2_6_10,600,,1000,11837.7,no
-RC1_6_1,600,,200,16960.1,no
-RC1_6_2,600,,200,15890.6,no
-RC1_6_3,600,,200,15181.4,no
-RC1_6_4,600,,200,14753.2,no
-RC1_6_5,600,,200,16536.3,no
-RC1_6_6,600,,200,16473.3,no
-RC1_6_7,600,,200,16055.3,no
-RC1_6_8,600,,200,15891.8,no
-RC1_6_9,600,,200,15803.5,no
-RC1_6_10,600,,200,15651.3,no
-RC2_6_1,600,,1000,11966.1,no
-RC2_6_2,600,,1000,10336.9,no
-RC2_6_3,600,,1000,8894.9,no
-RC2_6_4,600,,1000,6967.5,no
-RC2_6_5,600,,1000,11080.7,no
-RC2_6_6,600,,1000,10830.5,no
-RC2_6_7,600,,1000,10293.4,no
-RC2_6_8,600,,1000,9804.7,no
-RC2_6_9,600,,1000,9436,no
-RC2_6_10,600,,1000,8976.1,no
-C1_8_1,800,,200,25156.9,no
-C1_8_2,800,,200,24974.1,no
-C1_8_3,800,,200,24170.7,no
-C1_8_4,800,,200,23797.3,no
-C1_8_5,800,,200,25138.6,no
-C1_8_6,800,,200,25133.3,no
-C1_8_7,800,,200,25127.3,no
-C1_8_8,800,,200,24858.7,no
-C1_8_9,800,,200,24200.4,no
-C1_8_10,800,,200,24030.4,no
-C2_8_1,800,,700,11631.9,no
-C2_8_2,800,,700,11394.5,no
-C2_8_3,800,,700,11138.1,no
-C2_8_4,800,,700,10659.7,no
-C2_8_5,800,,700,11395.6,no
-C2_8_6,800,,700,11316.3,no
-C2_8_7,800,,700,11332.9,no
-C2_8_8,800,,700,11133.9,no
-C2_8_9,800,,700,11140.4,no
-C2_8_10,800,,700,10946,no
-R1_8_1,800,,200,36393.3,no
-R1_8_2,800,,200,32277.6,no
-R1_8_3,800,,200,29304.5,no
-R1_8_4,800,,200,27734.7,no
-R1_8_5,800,,200,33494.2,no
-R1_8_6,800,,200,30872.4,no
-R1_8_7,800,,200,28789,no
-R1_8_8,800,,200,27609.4,no
-R1_8_9,800,,200,32257.3,no
-R1_8_10,800,,200,30918.4,no
-R2_8_1,800,,1000,24986.8,no
-R2_8_2,800,,1000,21312.2,no
-R2_8_3,800,,1000,17237.8,no
-R2_8_4,800,,1000,13161.2,no
-R2_8_5,800,,1000,22802,no
-R2_8_6,800,,1000,19754.5,no
-R2_8_7,800,,1000,16378.3,no
-R2_8_8,800,,1000,12611.7,no
-R2_8_9,800,,1000,21294.1,no
-R2_8_10,800,,1000,20007,no
-RC1_8_1,800,,200,29997.3,no
-RC1_8_2,800,,200,28363.3,no
-RC1_8_3,800,,200,27485.5,no
-RC1_8_4,800,,200,26595.4,no
-RC1_8_5,800,,200,29306.4,no
-RC1_8_6,800,,200,29247.1,no
-RC1_8_7,800,,200,28823.8,no
-RC1_8_8,800,,200,28460.7,no
-RC1_8_9,800,,200,28400.5,no
-RC1_8_10,800,,200,28210.7,no
-RC2_8_1,800,,1000,19203.8,no
-RC2_8_2,800,,1000,16711.1,no
-RC2_8_3,800,,1000,14028.9,no
-RC2_8_4,800,,1000,10970.8,no
-RC2_8_5,800,,1000,17466.1,no
-RC2_8_6,800,,1000,17197.7,no
-RC2_8_7,800,,1000,16366.5,no
-RC2_8_8,800,,1000,15577.7,no
-RC2_8_9,800,,1000,15184.8,no
-RC2_8_10,800,,1000,14376.2,no
-C1_10_1,1000,,200,42444.8,no
-C1_10_2,1000,,200,41386.4,no
-C1_10_3,1000,,200,40064.4,no
-C1_10_4,1000,,200,39434.1,no
-C1_10_5,1000,,200,42434.8,no
-C1_10_6,1000,,200,42437,no
-C1_10_7,1000,,200,42420.4,no
-C1_10_8,1000,,200,41837.8,no
-C1_10_9,1000,,200,40288.4,no
-C1_10_10,1000,,200,39816.8,no
-C2_10_1,1000,,700,16841.1,no
-C2_10_2,1000,,700,16462.6,no
-C2_10_3,1000,,700,16036.5,no
-C2_10_4,1000,,700,15463.6,no
-C2_10_5,1000,,700,16521.3,no
-C2_10_6,1000,,700,16290.7,no
-C2_10_7,1000,,700,16378.4,no
-C2_10_8,1000,,700,16029.1,no
-C2_10_9,1000,,700,16075.5,no
-C2_10_10,1000,,700,15728.6,no
-R1_10_1,1000,,200,53223.2,no
-R1_10_2,1000,,200,48263.1,no
-R1_10_3,1000,,200,44677.1,no
-R1_10_4,1000,,200,42440.7,no
-R1_10_5,1000,,200,50406.7,no
-R1_10_6,1000,,200,46930.3,no
-R1_10_7,1000,,200,43997.4,no
-R1_10_8,1000,,200,42279.3,no
-R1_10_9,1000,,200,49162.8,no
-R1_10_10,1000,,200,47364.6,no
-R2_10_1,1000,,1000,36891.3,no
-R2_10_2,1000,,1000,31283.7,no
-R2_10_3,1000,,1000,24418.1,no
-R2_10_4,1000,,1000,17811.5,no
-R2_10_5,1000,,1000,34141.1,no
-R2_10_6,1000,,1000,29157.9,no
-R2_10_7,1000,,1000,23103.2,no
-R2_10_8,1000,,1000,17403.8,no
-R2_10_9,1000,,1000,32049.5,no
-R2_10_10,1000,,1000,29862,no
-RC1_10_1,1000,,200,45790.8,no
-RC1_10_2,1000,,200,43678.3,no
-RC1_10_3,1000,,200,42122,no
-RC1_10_4,1000,,200,41357.4,no
-RC1_10_5,1000,,200,45028.1,no
-RC1_10_6,1000,,200,44903.6,no
-RC1_10_7,1000,,200,44417.1,no
-RC1_10_8,1000,,200,43916.5,no
-RC1_10_9,1000,,200,43858.1,no
-RC1_10_10,1000,,200,43533.7,no
-RC2_10_1,1000,,1000,28147.4,no
-RC2_10_2,1000,,1000,24254.5,no
-RC2_10_3,1000,,1000,19632.3,no
-RC2_10_4,1000,,1000,15657,no
-RC2_10_5,1000,,1000,25811.2,no
-RC2_10_6,1000,,1000,25817.5,no
-RC2_10_7,1000,,1000,24435.1,no
-RC2_10_8,1000,,1000,23282.6,no
-RC2_10_9,1000,,1000,22746,no
-RC2_10_10,1000,,1000,21744.7,no
diff --git a/vrplib/download/list_names.py b/vrplib/download/list_names.py
deleted file mode 100644
index 1a29fb46..00000000
--- a/vrplib/download/list_names.py
+++ /dev/null
@@ -1,63 +0,0 @@
-import importlib.resources as pkg_resource
-import warnings
-from functools import lru_cache
-from typing import Optional
-
-from .download_utils import is_vrptw
-
-
-def list_names(
-    low: Optional[int] = None,
-    high: Optional[int] = None,
-    vrp_type: Optional[str] = None,
-):
-    """
-    Returns the names of the instances that can be downloaded from CVRPLIB.
-
-    Parameters
-    ----------
-    low
-        The minimum number of customers of the listed instances.
-    high
-        The maximum number of customers of the listed instances.
-    vrp_type
-        The vrp_type, one of ['cvrp', 'vrptw']. If not set, then instances
-        of both types are returned.
-    """
-    instances = _read_instance_data()
-    msg = (
-        "The function 'list_names' is deprecated and will be removed"
-        " in the next major version (vrplib v2.0.0)."
-    )
-    warnings.warn(msg, DeprecationWarning)
-
-    if low is not None:
-        instances = filter(lambda inst: inst["n_customers"] >= low, instances)
-
-    if high is not None:
-        instances = filter(lambda inst: inst["n_customers"] <= high, instances)
-
-    if vrp_type not in [None, "cvrp", "vrptw"]:
-        raise ValueError("vrp_type must be one of [None, 'cvrp', 'vrptw']")
-
-    elif vrp_type == "cvrp":
-        instances = filter(lambda inst: not is_vrptw(inst["name"]), instances)
-
-    elif vrp_type == "vrptw":
-        instances = filter(lambda inst: is_vrptw(inst["name"]), instances)
-
-    return [inst["name"] for inst in instances]
-
-
-@lru_cache()
-def _read_instance_data():
-    """
-    Reads the instance data. All CVRPLIB instance names are stored in the
-    `instance_data.csv` file.
-    """
-    fi = pkg_resource.read_text(__package__, "instance_data.csv")
-    instances = [line.strip().split(",") for line in fi.split()]
-
-    return [
-        {"name": inst[0], "n_customers": int(inst[1])} for inst in instances
-    ]
diff --git a/vrplib/parse/__init__.py b/vrplib/parse/__init__.py
index edd9a7f1..5e692434 100644
--- a/vrplib/parse/__init__.py
+++ b/vrplib/parse/__init__.py
@@ -1,3 +1,3 @@
-from .parse_solomon import parse_solomon
-from .parse_solution import parse_solution
-from .parse_vrplib import parse_vrplib
+from .parse_solomon import parse_solomon as parse_solomon
+from .parse_solution import parse_solution as parse_solution
+from .parse_vrplib import parse_vrplib as parse_vrplib
diff --git a/vrplib/parse/parse_distances.py b/vrplib/parse/parse_distances.py
index 99bc0061..0530042d 100644
--- a/vrplib/parse/parse_distances.py
+++ b/vrplib/parse/parse_distances.py
@@ -1,5 +1,4 @@
 from itertools import combinations
-from typing import Optional, Union
 
 import numpy as np
 
@@ -7,10 +6,10 @@
 def parse_distances(
     data: list[float],
     edge_weight_type: str,
-    edge_weight_format: Optional[str] = None,
-    node_coord: Optional[np.ndarray] = None,
-    comment: Optional[str] = None,
-    **kwargs: Union[float, str, np.ndarray],  # noqa
+    edge_weight_format: str | None = None,
+    node_coord: np.ndarray | None = None,
+    comment: str | None = None,
+    **kwargs: float | str | np.ndarray,
 ) -> np.ndarray:
     """
     Parses the distances. The specification "edge_weight_type" describes how
@@ -63,8 +62,8 @@ def parse_distances(
             # (C)VRPLIB format. Find a better way to identify Eilon instances.
             if comment is not None and "Eilon" in comment:
                 return from_eilon(data)
-            else:
-                return from_lower_row(data)
+
+            return from_lower_row(data)
 
         if edge_weight_format == "FULL_MATRIX":
             return np.array(data)
diff --git a/vrplib/parse/parse_solomon.py b/vrplib/parse/parse_solomon.py
index dbc4e8b1..f941dc24 100644
--- a/vrplib/parse/parse_solomon.py
+++ b/vrplib/parse/parse_solomon.py
@@ -1,11 +1,9 @@
-from typing import Union
-
 import numpy as np
 
 from .parse_distances import pairwise_euclidean
 from .parse_utils import text2lines
 
-Instance = dict[str, Union[str, float, np.ndarray]]
+Instance = dict[str, str | float | np.ndarray]
 
 
 def parse_solomon(text: str, compute_edge_weights: bool = True) -> Instance:
diff --git a/vrplib/parse/parse_solution.py b/vrplib/parse/parse_solution.py
index 3cf384f9..d9517b58 100644
--- a/vrplib/parse/parse_solution.py
+++ b/vrplib/parse/parse_solution.py
@@ -1,8 +1,6 @@
-from typing import Union
-
 from .parse_utils import infer_type, text2lines
 
-Solution = dict[str, Union[float, str, list]]
+Solution = dict[str, float | str | list]
 
 
 def parse_solution(text: str) -> Solution:
diff --git a/vrplib/parse/parse_utils.py b/vrplib/parse/parse_utils.py
index 39989a3e..e805a637 100644
--- a/vrplib/parse/parse_utils.py
+++ b/vrplib/parse/parse_utils.py
@@ -1,6 +1,3 @@
-from typing import Union
-
-
 def text2lines(text: str) -> list[str]:
     """
     Takes a string and returns a list of non-empty, stripped lines. Also
@@ -13,7 +10,7 @@ def text2lines(text: str) -> list[str]:
     ]
 
 
-def infer_type(s: str) -> Union[int, float, str]:
+def infer_type(s: str) -> int | float | str:
     try:
         return int(s)
     except ValueError:
diff --git a/vrplib/parse/parse_vrplib.py b/vrplib/parse/parse_vrplib.py
index 9cfd1640..d24a0d68 100644
--- a/vrplib/parse/parse_vrplib.py
+++ b/vrplib/parse/parse_vrplib.py
@@ -1,12 +1,11 @@
 import re
-from typing import Union
 
 import numpy as np
 
 from .parse_distances import parse_distances
 from .parse_utils import infer_type, text2lines
 
-Instance = dict[str, Union[str, float, np.ndarray]]
+Instance = dict[str, str | float | np.ndarray]
 
 
 def parse_vrplib(text: str, compute_edge_weights: bool = True) -> Instance:
@@ -68,9 +67,11 @@ def group_specifications_and_sections(lines: list[str]):
     for idx, line in enumerate(lines):
         if "EOF" in line:
             break
-        elif idx < end_section:  # Skip all lines of the current section
+
+        if idx < end_section:  # Skip all lines of the current section
             continue
-        elif ":" in line:
+
+        if ":" in line:
             specs.append(line)
         elif "_SECTION" in line:
             start = lines.index(line)
@@ -95,7 +96,7 @@ def group_specifications_and_sections(lines: list[str]):
     return specs, sections
 
 
-def parse_specification(line: str) -> tuple[str, Union[float, str]]:
+def parse_specification(line: str) -> tuple[str, float | str]:
     """
     Parses a specification line as keyword-value pair, split at the first colon
     occurrence. The keyword is made lowercase and the value is unmodified.
@@ -106,7 +107,7 @@ def parse_specification(line: str) -> tuple[str, Union[float, str]]:
 
 def parse_section(
     lines: list, instance: dict
-) -> tuple[str, Union[list, np.ndarray]]:
+) -> tuple[str, list | np.ndarray]:
     """
     Parses the data section lines.
     """
diff --git a/vrplib/read/__init__.py b/vrplib/read/__init__.py
index d766d53e..00b5da95 100644
--- a/vrplib/read/__init__.py
+++ b/vrplib/read/__init__.py
@@ -1,2 +1,2 @@
-from .read_instance import read_instance
-from .read_solution import read_solution
+from .read_instance import read_instance as read_instance
+from .read_solution import read_solution as read_solution
diff --git a/vrplib/read/read_instance.py b/vrplib/read/read_instance.py
index 8451c4d9..21f2724c 100644
--- a/vrplib/read/read_instance.py
+++ b/vrplib/read/read_instance.py
@@ -1,11 +1,11 @@
 import os
-from typing import Any, Union
+from typing import Any
 
 from vrplib.parse import parse_solomon, parse_vrplib
 
 
 def read_instance(
-    path: Union[str, os.PathLike],
+    path: str | os.PathLike,
     instance_format: str = "vrplib",
     compute_edge_weights: bool = True,
 ) -> dict[str, Any]:
@@ -29,7 +29,8 @@ def read_instance(
     with open(path, "r") as fi:
         if instance_format == "vrplib":
             return parse_vrplib(fi.read(), compute_edge_weights)
-        elif instance_format == "solomon":
+
+        if instance_format == "solomon":
             return parse_solomon(fi.read(), compute_edge_weights)
 
         raise ValueError(f"Format style {instance_format} not known.")
diff --git a/vrplib/read/read_solution.py b/vrplib/read/read_solution.py
index 4c670dbb..b476f4e1 100644
--- a/vrplib/read/read_solution.py
+++ b/vrplib/read/read_solution.py
@@ -1,10 +1,10 @@
 import os
-from typing import Any, Union
+from typing import Any
 
 from vrplib.parse import parse_solution
 
 
-def read_solution(path: Union[str, os.PathLike]) -> dict[str, Any]:
+def read_solution(path: str | os.PathLike) -> dict[str, Any]:
     """
     Reads the solution from the passed-in file path.
 
diff --git a/vrplib/write/__init__.py b/vrplib/write/__init__.py
index 50a09a0b..cd163961 100644
--- a/vrplib/write/__init__.py
+++ b/vrplib/write/__init__.py
@@ -1,2 +1,2 @@
-from .write_instance import write_instance
-from .write_solution import write_solution
+from .write_instance import write_instance as write_instance
+from .write_solution import write_solution as write_solution
diff --git a/vrplib/write/write_instance.py b/vrplib/write/write_instance.py
index 8b2ca324..52313c6d 100644
--- a/vrplib/write/write_instance.py
+++ b/vrplib/write/write_instance.py
@@ -1,5 +1,5 @@
 import os
-from typing import TypeVar, Union
+from typing import TypeVar
 
 import numpy as np
 
@@ -7,8 +7,8 @@
 
 
 def write_instance(
-    path: Union[str, os.PathLike],
-    data: dict[str, Union[str, int, float, _ArrayLike]],
+    path: str | os.PathLike,
+    data: dict[str, str | int | float | _ArrayLike],
 ):
     """
     Writes a VRP instance to file following the VRPLIB format [1].
@@ -88,7 +88,4 @@ def _format_section(name: str, data: _ArrayLike) -> str:
 
 
 def _is_one_dimensional(data: _ArrayLike) -> bool:
-    for elt in data:
-        if isinstance(elt, (list, tuple, np.ndarray)):
-            return False
-    return True
+    return all(not isinstance(elt, (list, tuple, np.ndarray)) for elt in data)
diff --git a/vrplib/write/write_solution.py b/vrplib/write/write_solution.py
index 48da1054..fdde6502 100644
--- a/vrplib/write/write_solution.py
+++ b/vrplib/write/write_solution.py
@@ -1,11 +1,11 @@
 import os
-from typing import Any, Optional, Union
+from typing import Any
 
 
 def write_solution(
-    path: Union[str, os.PathLike],
+    path: str | os.PathLike,
     routes: list[list[int]],
-    data: Optional[dict[str, Any]] = None,
+    data: dict[str, Any] | None = None,
 ):
     """
     Writes a VRP solution to file following the VRPLIB convention.