diff --git a/.github/workflows/basemap-data-hires.yml b/.github/workflows/basemap-data-hires.yml
deleted file mode 100644
index a33ddb149..000000000
--- a/.github/workflows/basemap-data-hires.yml
+++ /dev/null
@@ -1,137 +0,0 @@
-name: basemap-data-hires
-
-env:
-  PKGDIR: "packages/basemap_data_hires"
-  PIP_DEFAULT_TIMEOUT: 10
-  PIP_DISABLE_PIP_VERSION_CHECK: 1
-  PIP_PREFER_BINARY: 1
-  PIP_RETRIES: 0
-  PYTHONUNBUFFERED: "1"
-  PYTHONWARNINGS: "ignore:DEPRECATION"
-
-on:
-  push:
-    paths:
-      - ".github/workflows/basemap-data-hires.yml"
-      - "packages/basemap_data_hires/**"
-  pull_request:
-    paths:
-      - ".github/workflows/basemap-data-hires.yml"
-      - "packages/basemap_data_hires/**"
-  workflow_dispatch:
-
-jobs:
-
-  checkout:
-    runs-on: ubuntu-latest
-    steps:
-      -
-        name: Checkout
-        uses: actions/checkout@v4
-      -
-        name: Upload checkout
-        uses: actions/upload-artifact@v4
-        with:
-          name: checkout
-          path: .
-
-  build:
-    strategy:
-      matrix:
-        python-version:
-          ["2.7"]
-      max-parallel: 1
-    needs: checkout
-    runs-on: ubuntu-latest
-    container: "pylegacy/python:${{ matrix.python-version }}-debian-10"
-    steps:
-      -
-        name: Download checkout
-        uses: actions/download-artifact@v4
-        with:
-          name: checkout
-          path: .
-      -
-        name: Build sdist and wheel
-        run: |
-          cd ${{ env.PKGDIR }}
-          python setup.py sdist
-          pip wheel -w dist --no-deps dist/*.zip
-      -
-        name: Upload build artifacts
-        uses: actions/upload-artifact@v4
-        with:
-          name: artifacts-build
-          path: ${{ env.PKGDIR }}/dist
-
-  test:
-    strategy:
-      matrix:
-        python-version:
-          ["2.6", "2.7", "3.2", "3.3", "3.4", "3.5", "3.6", "3.7", "3.8",
-           "3.9", "3.10", "3.11", "3.12"]
-      max-parallel: 3
-      fail-fast: false
-    needs: build
-    runs-on: ubuntu-latest
-    container: "pylegacy/python:${{ matrix.python-version }}-debian-10"
-    steps:
-      -
-        name: Download checkout
-        uses: actions/download-artifact@v4
-        with:
-          name: checkout
-          path: .
-      -
-        name: Download build artifacts
-        uses: actions/download-artifact@v4
-        with:
-          name: artifacts-build
-          path: ${{ env.PKGDIR }}/dist
-      -
-        name: Install package
-        run: |
-          pip install ${{ env.PKGDIR }}/dist/*.whl
-      -
-        name: Test package
-        run: |
-          python -c "from mpl_toolkits import basemap_data; print(basemap_data)"
-
-  upload:
-    strategy:
-      matrix:
-        python-version:
-          ["2.7"]
-      max-parallel: 1
-    if: startsWith(github.event.ref, 'refs/tags/v')
-    needs: test
-    runs-on: ubuntu-latest
-    container: "pylegacy/python:${{ matrix.python-version }}-debian-10"
-    environment: PyPI
-    steps:
-      -
-        name: Download build artifacts
-        uses: actions/download-artifact@v4
-        with:
-          name: artifacts-build
-          path: ${{ env.PKGDIR }}/dist
-      -
-        name: Install upload requirements
-        run: |
-          pip install twine
-      -
-        name: Check distributables
-        run: |
-          python -m twine check                                               \
-              ${{ env.PKGDIR }}/dist/*.zip                                    \
-              ${{ env.PKGDIR }}/dist/*.whl
-      -
-        name: Upload distributables
-        env:
-          TWINE_USERNAME: __token__
-          TWINE_PASSWORD: "${{ secrets.PYPI_TOKEN }}"
-          TWINE_REPOSITORY_URL: "${{ secrets.PYPI_REPOSITORY_URL }}"
-        run: |
-          python -m twine upload --skip-existing                              \
-              ${{ env.PKGDIR }}/dist/*.zip                                    \
-              ${{ env.PKGDIR }}/dist/*.whl
diff --git a/.github/workflows/basemap-data.yml b/.github/workflows/basemap-data.yml
deleted file mode 100644
index 629213f31..000000000
--- a/.github/workflows/basemap-data.yml
+++ /dev/null
@@ -1,137 +0,0 @@
-name: basemap-data
-
-env:
-  PKGDIR: "packages/basemap_data"
-  PIP_DEFAULT_TIMEOUT: 10
-  PIP_DISABLE_PIP_VERSION_CHECK: 1
-  PIP_PREFER_BINARY: 1
-  PIP_RETRIES: 0
-  PYTHONUNBUFFERED: "1"
-  PYTHONWARNINGS: "ignore:DEPRECATION"
-
-on:
-  push:
-    paths:
-      - ".github/workflows/basemap-data.yml"
-      - "packages/basemap_data/**"
-  pull_request:
-    paths:
-      - ".github/workflows/basemap-data.yml"
-      - "packages/basemap_data/**"
-  workflow_dispatch:
-
-jobs:
-
-  checkout:
-    runs-on: ubuntu-latest
-    steps:
-      -
-        name: Checkout
-        uses: actions/checkout@v4
-      -
-        name: Upload checkout
-        uses: actions/upload-artifact@v4
-        with:
-          name: checkout
-          path: .
-
-  build:
-    strategy:
-      matrix:
-        python-version:
-          ["2.7"]
-      max-parallel: 1
-    needs: checkout
-    runs-on: ubuntu-latest
-    container: "pylegacy/python:${{ matrix.python-version }}-debian-10"
-    steps:
-      -
-        name: Download checkout
-        uses: actions/download-artifact@v4
-        with:
-          name: checkout
-          path: .
-      -
-        name: Build sdist and wheel
-        run: |
-          cd ${{ env.PKGDIR }}
-          python setup.py sdist
-          pip wheel -w dist --no-deps dist/*.zip
-      -
-        name: Upload build artifacts
-        uses: actions/upload-artifact@v4
-        with:
-          name: artifacts-build
-          path: ${{ env.PKGDIR }}/dist
-
-  test:
-    strategy:
-      matrix:
-        python-version:
-          ["2.6", "2.7", "3.2", "3.3", "3.4", "3.5", "3.6", "3.7", "3.8",
-           "3.9", "3.10", "3.11", "3.12"]
-      max-parallel: 3
-      fail-fast: false
-    needs: build
-    runs-on: ubuntu-latest
-    container: "pylegacy/python:${{ matrix.python-version }}-debian-10"
-    steps:
-      -
-        name: Download checkout
-        uses: actions/download-artifact@v4
-        with:
-          name: checkout
-          path: .
-      -
-        name: Download build artifacts
-        uses: actions/download-artifact@v4
-        with:
-          name: artifacts-build
-          path: ${{ env.PKGDIR }}/dist
-      -
-        name: Install package
-        run: |
-          pip install ${{ env.PKGDIR }}/dist/*.whl
-      -
-        name: Test package
-        run: |
-          python -c "from mpl_toolkits import basemap_data; print(basemap_data)"
-
-  upload:
-    strategy:
-      matrix:
-        python-version:
-          ["2.7"]
-      max-parallel: 1
-    if: startsWith(github.event.ref, 'refs/tags/v')
-    needs: test
-    runs-on: ubuntu-latest
-    container: "pylegacy/python:${{ matrix.python-version }}-debian-10"
-    environment: PyPI
-    steps:
-      -
-        name: Download build artifacts
-        uses: actions/download-artifact@v4
-        with:
-          name: artifacts-build
-          path: ${{ env.PKGDIR }}/dist
-      -
-        name: Install upload requirements
-        run: |
-          pip install twine
-      -
-        name: Check distributables
-        run: |
-          python -m twine check                                               \
-              ${{ env.PKGDIR }}/dist/*.zip                                    \
-              ${{ env.PKGDIR }}/dist/*.whl
-      -
-        name: Upload distributables
-        env:
-          TWINE_USERNAME: __token__
-          TWINE_PASSWORD: "${{ secrets.PYPI_TOKEN }}"
-          TWINE_REPOSITORY_URL: "${{ secrets.PYPI_REPOSITORY_URL }}"
-        run: |
-          python -m twine upload --skip-existing                              \
-              ${{ env.PKGDIR }}/dist/*.zip                                    \
-              ${{ env.PKGDIR }}/dist/*.whl
diff --git a/.github/workflows/basemap-for-manylinux.yml b/.github/workflows/basemap-for-manylinux.yml
deleted file mode 100644
index cdd577b17..000000000
--- a/.github/workflows/basemap-for-manylinux.yml
+++ /dev/null
@@ -1,449 +0,0 @@
-name: basemap-for-manylinux
-
-env:
-  PKGDIR: "packages/basemap"
-  PIP_DEFAULT_TIMEOUT: 10
-  PIP_DISABLE_PIP_VERSION_CHECK: 1
-  PIP_PREFER_BINARY: 1
-  PIP_RETRIES: 0
-  PYTHONUNBUFFERED: "1"
-  PYTHONWARNINGS: "ignore:DEPRECATION"
-
-on:
-  push:
-    paths:
-      - ".github/workflows/basemap-for-manylinux.yml"
-      - "packages/basemap/**"
-  pull_request:
-    paths:
-      - ".github/workflows/basemap-for-manylinux.yml"
-      - "packages/basemap/**"
-  workflow_dispatch:
-
-jobs:
-
-  checkout:
-    runs-on: ubuntu-latest
-    steps:
-      -
-        name: Checkout
-        uses: actions/checkout@v1
-      -
-        name: Upload checkout
-        uses: actions/upload-artifact@v1
-        with:
-          name: checkout
-          path: .
-
-  lint:
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        python-version:
-          ["2.7", "3.5", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
-      max-parallel: 3
-      fail-fast: false
-    needs: checkout
-    container: "pylegacy/python:${{ matrix.python-version }}-debian-10"
-    steps:
-      -
-        name: Download checkout
-        uses: actions/download-artifact@v1
-        with:
-          name: checkout
-          path: .
-      -
-        name: Install lint requirements
-        run: |
-          cd ${{ env.PKGDIR }}
-          pip install -r requirements-lint.txt
-      -
-        name: Install library requirements
-        run: |
-          cd ${{ env.PKGDIR }}
-          pip install -r requirements.txt
-      -
-        name: Run Flake8
-        run: |
-          cd ${{ env.PKGDIR }}
-          if [ -x "$(command -v flake8)" ]; then
-              flake8 src/mpl_toolkits/basemap/cm.py src/mpl_toolkits/basemap/diagnostic.py src/mpl_toolkits/basemap/proj.py src/mpl_toolkits/basemap/solar.py test;
-          fi
-      -
-        name: Run PyLint
-        run: |
-          cd ${{ env.PKGDIR }}
-          if [ -x "$(command -v pylint)" ]; then
-              pylint src/mpl_toolkits/basemap/cm.py src/mpl_toolkits/basemap/diagnostic.py src/mpl_toolkits/basemap/proj.py src/mpl_toolkits/basemap/solar.py test;
-          fi
-
-  build-geos:
-    strategy:
-      matrix:
-        arch:
-          ["x64", "x86"]
-      max-parallel: 2
-      fail-fast: false
-    needs: lint
-    runs-on: ubuntu-latest
-    container: "pylegacy/${{ matrix.arch }}-python:3.8-debian-4"
-    steps:
-      -
-        name: Download checkout
-        uses: actions/download-artifact@v1
-        with:
-          name: checkout
-          path: .
-      -
-        name: Install CMake 3.6.2
-        run: |
-          apt-get update
-          apt-get install -y libidn11
-          pkgvers=3.6.2
-          pkgname=cmake
-          pkgcode=cmake-${pkgvers}
-          case "${{ matrix.arch }}" in
-              x86)  pkgfile=${pkgcode}-Linux-i386.tar.gz;;
-              *)    pkgfile=${pkgcode}-Linux-x86_64.tar.gz;;
-          esac
-          wget https://github.com/Kitware/CMake/releases/download/v${pkgvers}/${pkgfile} -P /tmp
-          tar -xf /tmp/${pkgfile} --strip-components=1 -C /usr
-          rm -rf /tmp/${pkgfile}
-      -
-        name: Install GCC toolchain
-        run: |
-          apt-get update
-          apt-get install -y gcc g++ make
-      -
-        name: Build GEOS from source
-        run: |
-          cd ${{ env.PKGDIR }}
-          python -c "import utils; utils.GeosLibrary('3.6.5').build('extern', njobs=16)"
-      -
-        name: Upload GEOS artifacts
-        uses: actions/upload-artifact@v1
-        with:
-          name: artifacts-geos-${{ matrix.arch }}
-          path: ${{ env.PKGDIR }}/extern
-
-  build:
-    strategy:
-      matrix:
-        arch:
-          ["x64", "x86"]
-        python-version:
-          ["2.7", "3.5", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
-      max-parallel: 3
-      fail-fast: false
-    needs: build-geos
-    runs-on: ubuntu-latest
-    container: "pylegacy/${{ matrix.arch }}-python:${{ matrix.python-version }}-debian-4"
-    steps:
-      -
-        name: Download checkout
-        uses: actions/download-artifact@v1
-        with:
-          name: checkout
-          path: .
-      -
-        name: Download GEOS artifacts
-        uses: actions/download-artifact@v1
-        with:
-          name: artifacts-geos-${{ matrix.arch }}
-          path: ${{ env.PKGDIR }}/extern
-      -
-        name: Install GCC toolchain
-        run: |
-          apt-get update
-          apt-get install -y gcc g++ make
-      -
-        name: Build old numpy from source
-        run: |
-          case "${{ matrix.arch }}" in
-              x64)  arch="x86_64" ;;
-              x86)  arch="i686"   ;;
-          esac
-          case "${{ matrix.python-version }}" in
-              2.6|3.[23])      pkgvers=1.11.3; tag=manylinux1 ;;
-              2.7|3.[456789])  pkgvers=1.16.6; tag=manylinux1 ;;
-              3.10)            pkgvers=1.21.4; tag=manylinux1 ;;
-              3.11)            pkgvers=1.23.3; tag=manylinux_2_17 ;;
-              *)               pkgvers=1.26.1; tag=manylinux_2_28 ;;
-          esac
-          case "${{ matrix.python-version }}" in
-              3.11|3.12)
-                  # Dirty solution to get NumPy headers for Python 3.11 and 3.12.
-                  kwds="--plat=${tag}_${arch}"
-                  pip download --no-deps ${kwds} "numpy==${pkgvers}"
-                  oldpkgfile=$(ls *.whl | head -n1)
-                  newpkgfile=$(echo "${oldpkgfile}" | sed "s/${tag}/linux/")
-                  mv "${oldpkgfile}" "${newpkgfile}"
-                  pip install "${newpkgfile}"
-                  rm "${newpkgfile}"
-              ;;
-              *)
-                  pip install "numpy == ${pkgvers}"
-              ;;
-          esac
-      -
-        name: Build wheel
-        run: |
-          sitepkgdir=$(pip show numpy 2>/dev/null | grep Location: | cut -d' ' -f2)
-          export GEOS_DIR="${GITHUB_WORKSPACE}/${{ env.PKGDIR }}/extern"
-          export NUMPY_INCLUDE_PATH=${sitepkgdir}/numpy/core/include
-          case "${{ matrix.python-version }}" in
-              3.11|3.12)
-                kwds="--no-build-isolation"
-                pip install setuptools wheel "cython >= 0.29, < 3.1"
-              ;;
-          esac
-          cd ${{ env.PKGDIR }}
-          python setup.py sdist
-          pip wheel -w dist --no-deps ${kwds} dist/*.zip
-      -
-        name: Upload build artifacts
-        uses: actions/upload-artifact@v1
-        with:
-          name: artifacts-build-${{ matrix.arch }}-${{ matrix.python-version }}
-          path: ${{ env.PKGDIR }}/dist
-
-  repair:
-    strategy:
-      matrix:
-        arch:
-          ["x64", "x86"]
-        python-version:
-          ["2.7", "3.5", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
-      max-parallel: 3
-      fail-fast: false
-    needs: build
-    runs-on: ubuntu-latest
-    container: "pylegacy/${{ matrix.arch }}-python:3.8-debian-10"
-    steps:
-      -
-        name: Download GEOS artifacts
-        uses: actions/download-artifact@v1
-        with:
-          name: artifacts-geos-${{ matrix.arch }}
-          path: ${{ env.PKGDIR }}/extern
-      -
-        name: Download build artifacts
-        uses: actions/download-artifact@v1
-        with:
-          name: artifacts-build-${{ matrix.arch }}-${{ matrix.python-version }}
-          path: ${{ env.PKGDIR }}/dist
-      -
-        name: Install auditwheel
-        run: |
-          apt-get update
-          apt-get install -y unzip
-          pip install patchelf
-          pip install "auditwheel < 4.0"
-      -
-        name: Repair wheel
-        run: |
-          cd ${{ env.PKGDIR }}
-          export LD_LIBRARY_PATH="$(readlink -f extern/lib)"
-          auditwheel repair -w dist dist/*.whl
-      -
-        name: Upload build artifacts
-        uses: actions/upload-artifact@v1
-        with:
-          name: artifacts-build-${{ matrix.arch }}-${{ matrix.python-version }}
-          path: ${{ env.PKGDIR }}/dist
-
-  test:
-    strategy:
-      matrix:
-        arch:
-          ["x64", "x86"]
-        python-version:
-          ["2.7", "3.5", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
-        exclude:
-          # Missing precompiled binaries for `numpy`, `matplotlib`,
-          # `pyproj`, `pillow` and `lxml`.
-          - arch: "x86"
-            python-version: "3.12"
-      max-parallel: 3
-      fail-fast: false
-    needs: repair
-    runs-on: ubuntu-latest
-    container: "pylegacy/${{ matrix.arch }}-python:${{ matrix.python-version }}-debian-10"
-    steps:
-      -
-        name: Download checkout
-        uses: actions/download-artifact@v1
-        with:
-          name: checkout
-          path: .
-      -
-        name: Download build artifacts
-        uses: actions/download-artifact@v1
-        with:
-          name: artifacts-build-${{ matrix.arch }}-${{ matrix.python-version }}
-          path: ${{ env.PKGDIR }}/dist
-      -
-        name: Install numpy from source
-        run: |
-          apt-get update
-          apt-get install -y gcc g++ make
-          pip install "numpy < 1.24"
-        if: matrix.arch == 'x86' && (matrix.python-version >= '3.8' || matrix.python-version >= '3.10')
-      -
-        name: Install test requirements
-        run: |
-          cd ${{ env.PKGDIR }}
-          pip install -r requirements-test.txt
-      -
-        name: Install package (full)
-        run: |
-          whlpath=$(ls ${{ env.PKGDIR }}/dist/*-manylinux1*.whl | head -n1)
-          pip install "${whlpath}[owslib,pillow]"
-      -
-        name: Test package
-        run: |
-          cd ${{ env.PKGDIR }}
-          export COVERAGE_FILE=.coverage.${{ matrix.python-version }}
-          python -m pytest                                                    \
-              --cov="mpl_toolkits.basemap" --cov-report=term                  \
-              --ignore=dist --ignore=build
-      -
-        name: Upload test artifacts
-        uses: actions/upload-artifact@v1
-        with:
-          name: artifacts-test
-          path: ${{ env.PKGDIR }}/.coverage.${{ matrix.python-version }}
-
-  coverage:
-    needs: test
-    runs-on: ubuntu-latest
-    container: "pylegacy/python:3.8-debian-10"
-    steps:
-      -
-        name: Checkout
-        uses: actions/checkout@v1
-      -
-        name: Download test artifacts
-        uses: actions/download-artifact@v1
-        with:
-          name: artifacts-test
-          path: ${{ env.PKGDIR }}
-      -
-        name: Install test requirements
-        run: |
-          cd ${{ env.PKGDIR }}
-          pip install -r requirements-test.txt
-      -
-        name: Compute combined coverage
-        run: |
-          cd ${{ env.PKGDIR }}
-          coverage combine
-          coverage html
-          coverage report
-      -
-        name: Upload coverage artifacts
-        uses: actions/upload-artifact@v1
-        with:
-          name: artifacts-coverage
-          path: ${{ env.PKGDIR }}/htmlcov
-
-  docs:
-    needs: test
-    runs-on: ubuntu-latest
-    container: "pylegacy/python:3.8-debian-10"
-    steps:
-      -
-        name: Download checkout
-        uses: actions/download-artifact@v1
-        with:
-          name: checkout
-          path: .
-      -
-        name: Install doc requirements
-        run: |
-          cd ${{ env.PKGDIR }}
-          pip install -r requirements-doc.txt
-      -
-        name: Download build artifacts
-        uses: actions/download-artifact@v1
-        with:
-          name: artifacts-build-x64-3.8
-          path: ${{ env.PKGDIR }}/dist
-      -
-        name: Install package
-        run: |
-          cd ${{ env.PKGDIR }}
-          pip install dist/*-manylinux1*.whl
-      -
-        name: Run sphinx
-        run: |
-          cd ${{ env.PKGDIR }}
-          python -m sphinx doc/source public
-      -
-        name: Upload docs artifacts
-        uses: actions/upload-artifact@v1
-        with:
-          name: artifacts-docs
-          path: ${{ env.PKGDIR }}/public
-      -
-        name: Upload github-pages artifact
-        uses: actions/upload-pages-artifact@v3
-        with:
-          name: artifacts-github-pages
-          path: ${{ env.PKGDIR }}/public
-
-  pages:
-    if: startsWith(github.event.ref, 'refs/tags/v')
-    needs: docs
-    runs-on: ubuntu-latest
-    environment:
-      name: github-pages
-      url: ${{ steps.deployment.outputs.page_url }}
-    permissions:
-      pages: write
-      id-token: write
-    steps:
-      - name: Deploy github-pages
-        uses: actions/deploy-pages@v3
-        id: deployment
-
-  upload:
-    strategy:
-      matrix:
-        arch:
-          ["x64", "x86"]
-        python-version:
-          ["2.7", "3.5", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
-      max-parallel: 1
-    if: startsWith(github.event.ref, 'refs/tags/v')
-    needs: test
-    runs-on: ubuntu-latest
-    container: "pylegacy/${{ matrix.arch }}-python:${{ matrix.python-version }}-debian-10"
-    environment: PyPI
-    steps:
-      -
-        name: Download build artifacts
-        uses: actions/download-artifact@v1
-        with:
-          name: artifacts-build-${{ matrix.arch }}-${{ matrix.python-version }}
-          path: ${{ env.PKGDIR }}/dist
-      -
-        name: Install upload requirements
-        run: |
-          pip install twine
-      -
-        name: Check distributables
-        run: |
-          python -m twine check                                               \
-              ${{ env.PKGDIR }}/dist/*.zip                                    \
-              ${{ env.PKGDIR }}/dist/*-manylinux1*.whl
-      -
-        name: Upload distributables
-        env:
-          TWINE_USERNAME: __token__
-          TWINE_PASSWORD: "${{ secrets.PYPI_TOKEN }}"
-          TWINE_REPOSITORY_URL: "${{ secrets.PYPI_REPOSITORY_URL }}"
-        run: |
-          python -m twine upload --skip-existing                              \
-              ${{ env.PKGDIR }}/dist/*.zip                                    \
-              ${{ env.PKGDIR }}/dist/*-manylinux1*.whl
diff --git a/.github/workflows/basemap-for-windows.yml b/.github/workflows/basemap-for-windows.yml
deleted file mode 100644
index 92eb337fc..000000000
--- a/.github/workflows/basemap-for-windows.yml
+++ /dev/null
@@ -1,326 +0,0 @@
-name: basemap-for-windows
-
-env:
-  PKGDIR: "packages/basemap"
-  PIP_DEFAULT_TIMEOUT: 10
-  PIP_DISABLE_PIP_VERSION_CHECK: 1
-  PIP_PREFER_BINARY: 1
-  PIP_RETRIES: 0
-  PYTHONUNBUFFERED: "1"
-  PYTHONWARNINGS: "ignore:DEPRECATION"
-
-on:
-  push:
-    paths:
-      - ".github/workflows/basemap-for-windows.yml"
-      - "!packages/basemap/doc/**"
-      - "packages/basemap/**"
-  pull_request:
-    paths:
-      - ".github/workflows/basemap-for-windows.yml"
-      - "!packages/basemap/doc/**"
-      - "packages/basemap/**"
-  workflow_dispatch:
-
-jobs:
-
-  checkout:
-    runs-on: windows-2019
-    steps:
-      -
-        name: Checkout
-        uses: actions/checkout@v4
-      -
-        name: Upload checkout
-        uses: actions/upload-artifact@v4
-        with:
-          name: checkout
-          path: .
-
-  lint:
-    runs-on: windows-2019
-    strategy:
-      matrix:
-        python-version:
-          ["2.7", "3.5", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
-      max-parallel: 3
-      fail-fast: false
-    needs: checkout
-    steps:
-      -
-        name: Download checkout
-        uses: actions/download-artifact@v4
-        with:
-          name: checkout
-          path: .
-      -
-        name: Set Python
-        uses: pylegacy/actions/setup-pyenv-win@v2
-        with:
-          architecture: ${{ matrix.arch }}
-          python-version: ${{ matrix.python-version }}
-      -
-        name: Set Python base packages
-        run: |
-          python -m pip install --upgrade pip setuptools wheel
-      -
-        name: Install lint requirements
-        run: |
-          cd ${{ env.PKGDIR }}
-          python -m pip install -r requirements-lint.txt
-      -
-        name: Install library requirements
-        run: |
-          cd ${{ env.PKGDIR }}
-          python -m pip install -r requirements.txt
-      -
-        name: Run Flake8
-        run: |
-          cd ${{ env.PKGDIR }}
-          if (Get-Command flake8 -errorAction SilentlyContinue)
-          {
-              flake8 src/mpl_toolkits/basemap/cm.py src/mpl_toolkits/basemap/diagnostic.py src/mpl_toolkits/basemap/proj.py src/mpl_toolkits/basemap/solar.py test;
-          }
-      -
-        name: Run PyLint
-        run: |
-          cd ${{ env.PKGDIR }}
-          if (Get-Command pylint -errorAction SilentlyContinue)
-          {
-              pylint src/mpl_toolkits/basemap/cm.py src/mpl_toolkits/basemap/diagnostic.py src/mpl_toolkits/basemap/proj.py src/mpl_toolkits/basemap/solar.py test;
-          }
-
-  build-geos:
-    strategy:
-      matrix:
-        arch:
-          ["x64", "x86"]
-        msvc-toolset:
-          ["9.0", "14.0"]
-        include:
-          - msvc-toolset: "9.0"
-            python-version: "2.7"
-          - msvc-toolset: "14.0"
-            python-version: "3.5"
-      max-parallel: 4
-      fail-fast: false
-    needs: lint
-    runs-on: windows-2019
-    steps:
-      -
-        name: Download checkout
-        uses: actions/download-artifact@v4
-        with:
-          name: checkout
-          path: .
-      -
-        name: Set MSVC toolset
-        uses: pylegacy/actions/setup-msvc@v2
-        with:
-          arch: ${{ matrix.arch }}
-          toolset: ${{ matrix.msvc-toolset }}
-      -
-        name: Set CMake
-        uses: jwlawson/actions-setup-cmake@v2.0
-        with:
-          cmake-version: "3.24.2"
-      -
-        name: Set Python
-        uses: pylegacy/actions/setup-pyenv-win@v2
-        with:
-          architecture: ${{ matrix.arch }}
-          python-version: ${{ matrix.python-version }}
-      -
-        name: Build GEOS from source
-        run: |
-          cd ${{ env.PKGDIR }}
-          python -c "import utils; utils.GeosLibrary('3.6.5').build('extern', toolset='${{ matrix.msvc-toolset }}', njobs=16)"
-      -
-        name: Upload GEOS artifacts
-        uses: actions/upload-artifact@v4
-        with:
-          name: artifacts-geos-${{ matrix.arch }}-msvc${{ matrix.msvc-toolset }}
-          path: ${{ env.PKGDIR }}/extern
-
-  build:
-    strategy:
-      matrix:
-        arch:
-          ["x64", "x86"]
-        python-version:
-          ["2.7", "3.5", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
-      max-parallel: 3
-      fail-fast: false
-    needs: build-geos
-    runs-on: windows-2019
-    steps:
-      -
-        name: Download checkout
-        uses: actions/download-artifact@v4
-        with:
-          name: checkout
-          path: .
-      -
-        name: Set Python
-        uses: pylegacy/actions/setup-pyenv-win@v2
-        with:
-          architecture: ${{ matrix.arch }}
-          python-version: ${{ matrix.python-version }}
-      -
-        name: Set Python base packages
-        run: |
-          python -m pip install --upgrade pip setuptools wheel
-      -
-        name: Build old numpy from source
-        run: |
-          Switch -regex ("${{ matrix.python-version }}") {
-              "^2\.6|3\.[123]$"     { Set-Variable -Name "pkgvers" -Value "1.11.3" }
-              "^2\.7|3\.[456789]$"  { Set-Variable -Name "pkgvers" -Value "1.16.6" }
-              "^3\.10$"             { Set-Variable -Name "pkgvers" -Value "1.21.4" }
-              "^3\.11$"             { Set-Variable -Name "pkgvers" -Value "1.23.3" }
-              default               { Set-Variable -Name "pkgvers" -Value "1.26.1" }
-          }
-          $env:SETUPTOOLS_USE_DISTUTILS = "stdlib"
-          python -m pip install "numpy == ${pkgvers}"
-      -
-        name: Set MSVC toolset version
-        run: |
-          if ("${{ matrix.python-version }}" -eq "2.7") {
-              echo "msvc-toolset=9.0" >> $env:GITHUB_ENV
-          } else {
-              echo "msvc-toolset=14.0" >> $env:GITHUB_ENV
-          }
-      -
-        name: Set MSVC toolset
-        uses: pylegacy/actions/setup-msvc@v2
-        with:
-          arch: ${{ matrix.arch }}
-          toolset: ${{ env.msvc-toolset }}
-      -
-        name: Download GEOS artifacts
-        uses: actions/download-artifact@v4
-        with:
-          name: artifacts-geos-${{ matrix.arch }}-msvc${{ env.msvc-toolset }}
-          path: ${{ env.PKGDIR }}/extern
-      -
-        name: Build sdist and wheel
-        run: |
-          cd ${{ env.PKGDIR }}
-          $env:GEOS_DIR = "$env:GITHUB_WORKSPACE/${{ env.PKGDIR }}/extern"
-          python -m pip install -r requirements-setup.txt
-          python setup.py sdist
-          python -m pip wheel -w dist --no-deps (Get-Item dist/*.zip)
-      -
-        name: Upload build artifacts
-        uses: actions/upload-artifact@v4
-        with:
-          name: artifacts-build-${{ matrix.arch }}-${{ matrix.python-version }}
-          path: ${{ env.PKGDIR }}/dist
-
-  test:
-    strategy:
-      matrix:
-        arch:
-          ["x64", "x86"]
-        python-version:
-          ["2.7", "3.5", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
-        exclude:
-          # Missing precompiled binaries for `numpy` and `matplotlib`.
-          - arch: "x86"
-            python-version: "3.12"
-      max-parallel: 3
-      fail-fast: false
-    needs: build
-    runs-on: windows-2019
-    steps:
-      -
-        name: Download checkout
-        uses: actions/download-artifact@v4
-        with:
-          name: checkout
-          path: .
-      -
-        name: Download build artifacts
-        uses: actions/download-artifact@v4
-        with:
-          name: artifacts-build-${{ matrix.arch }}-${{ matrix.python-version }}
-          path: ${{ env.PKGDIR }}/dist
-      -
-        name: Set Python
-        uses: pylegacy/actions/setup-pyenv-win@v2
-        with:
-          architecture: ${{ matrix.arch }}
-          python-version: ${{ matrix.python-version }}
-      -
-        name: Set Python base packages
-        run: |
-          python -m pip install --upgrade pip setuptools wheel
-      -
-        name: Install test requirements
-        run: |
-          cd ${{ env.PKGDIR }}
-          pip install -r requirements-test.txt
-      -
-        name: Install package (full)
-        run: |
-          $whlpath = "$(Get-Item ${{ env.PKGDIR }}/dist/*-win*.whl)"
-          python -m pip install "${whlpath}[owslib,pillow]"
-      -
-        name: Test package
-        run: |
-          cd ${{ env.PKGDIR }}
-          $env:COVERAGE_FILE = ".coverage.${{ matrix.arch }}.${{ matrix.python-version }}"
-          python -m pytest                                                    `
-              --cov="mpl_toolkits.basemap" --cov-report=term                  `
-              --ignore=dist --ignore=build
-      -
-        name: Upload test artifacts
-        uses: actions/upload-artifact@v4
-        with:
-          name: artifacts-test-${{ matrix.arch }}-${{ matrix.python-version }}
-          path: ${{ env.PKGDIR }}/.coverage.${{ matrix.arch }}.${{ matrix.python-version }}
-
-  upload:
-    strategy:
-      matrix:
-        arch:
-          ["x64", "x86"]
-        python-version:
-          ["2.7", "3.5", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
-      max-parallel: 1
-    if: startsWith(github.event.ref, 'refs/tags/v')
-    needs: test
-    runs-on: windows-2019
-    environment: PyPI
-    steps:
-      -
-        name: Set Python
-        uses: pylegacy/actions/setup-pyenv-win@v2
-        with:
-          architecture: ${{ matrix.arch }}
-          python-version: ${{ matrix.python-version }}
-      -
-        name: Download build artifacts
-        uses: actions/download-artifact@v4
-        with:
-          name: artifacts-build-${{ matrix.arch }}-${{ matrix.python-version }}
-          path: ${{ env.PKGDIR }}/dist
-      -
-        name: Install upload requirements
-        run: |
-          python -m pip install twine
-      -
-        name: Check distributables
-        run: |
-          python -m twine check                                               `
-              ${{ env.PKGDIR }}/dist/*.zip                                    `
-              ${{ env.PKGDIR }}/dist/*.whl
-      -
-        name: Upload distributables
-        env:
-          TWINE_USERNAME: __token__
-          TWINE_PASSWORD: "${{ secrets.PYPI_TOKEN }}"
-          TWINE_REPOSITORY_URL: "${{ secrets.PYPI_REPOSITORY_URL }}"
-        run: |
-          python -m twine upload --skip-existing                              `
-              ${{ env.PKGDIR }}/dist/*.whl
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 000000000..c2ca8e4bd
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,138 @@
+name: Build
+
+on:
+  push:
+    paths:
+      - ".github/workflows/**"
+      - "packages/basemap/**"
+      - "packages/basemap_data/**"
+      - "packages/basemap_data_hires/**"
+  pull_request:
+    paths:
+      - ".github/workflows/**"
+      - "packages/basemap/**"
+      - "packages/basemap_data/**"
+      - "packages/basemap_data_hires/**"
+  workflow_dispatch:
+
+jobs:
+  build_data:
+    name: Build data packages
+    strategy:
+      matrix:
+        package: [basemap_data, basemap_data_hires]
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.9"
+
+      - name: Build sdist and wheels
+        run: |
+          cd packages/${{ matrix.package }}
+          python -m pip install build wheel
+          python -m build --sdist --wheel
+
+      - uses: actions/upload-artifact@v4
+        with:
+          path: |
+            packages/${{ matrix.package }}/dist/*.tar.gz
+            packages/${{ matrix.package }}/dist/*.whl
+          name: dist-${{ matrix.package }}
+
+  build_basemap:
+    name: Build basemap package (${{ matrix.os }})
+    needs: [build_data]
+    strategy:
+      matrix:
+        os: [ubuntu-22.04, windows-2019, macos-13, macos-14]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.9"
+
+      - name: Build sdist
+        if: matrix.os == 'ubuntu-22.04'
+        run: |
+          cd packages/basemap
+          python -m pip install build
+          python -m build --sdist
+
+      - name: Build wheels
+        uses: pypa/cibuildwheel@v2.22.0
+        env:
+          CIBW_ARCHS: "native"
+          CIBW_BUILD: "cp39* cp310* cp311* cp312* cp313*"
+          CIBW_BUILD_VERBOSITY: 1
+          CIBW_SKIP: "*-musllinux_*"
+          CIBW_BEFORE_ALL: "python {project}/.github/workflows/run_before_all.py"
+          CIBW_TEST_EXTRAS: "test"
+          CIBW_TEST_COMMAND: "python -m pytest {project}/packages/basemap"
+          CIBW_ENVIRONMENT: >-
+            GEOS_VERSION="3.6.5"
+            GEOS_DIR="$(pwd)/extern"
+            GEOS_NJOBS=4
+            PIP_PREFER_BINARY=1
+            PYTHONUNBUFFERED=1
+            LD_LIBRARY_PATH="${GEOS_DIR}/lib"
+          # LD_LIBRARY_PATH in environment is needed by
+          # auditwheel (Linux) and delocate (MacOS).
+        with:
+          package-dir: "packages/basemap"
+          output-dir: "packages/basemap/dist"
+
+      - uses: actions/upload-artifact@v4
+        with:
+          path: |
+            packages/basemap/dist/*.tar.gz
+            packages/basemap/dist/*.whl
+          name: dist-basemap-${{ matrix.os }}
+
+  check:
+    name: Check packages
+    needs: [build_data, build_basemap]
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          path: dist
+          pattern: "dist-*"
+          merge-multiple: true
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.9"
+
+      - name: Check packages with twine
+        run: |
+          python -m pip install twine
+          python -m twine check dist/*.tar.gz
+          python -m twine check dist/*.whl
+
+  upload:
+    name: Upload packages
+    needs: [build_data, build_basemap, check]
+    runs-on: ubuntu-22.04
+    environment: PyPI
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/v')
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          path: dist
+          pattern: "dist-*"
+          merge-multiple: true
+
+      - name: Publish to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          password: ${{ secrets.PYPI_TOKEN }}
+          repository-url: ${{ secrets.PYPI_REPOSITORY_URL }}
+          skip-existing: true
diff --git a/.github/workflows/run_before_all.py b/.github/workflows/run_before_all.py
new file mode 100644
index 000000000..575a26763
--- /dev/null
+++ b/.github/workflows/run_before_all.py
@@ -0,0 +1,37 @@
+#! /usr/bin/env python
+"""Helper script to be run by `cibuildwheel` as `before_all` step."""
+
+import os
+import sys
+
+HERE = os.path.abspath(__file__)
+ROOT = os.path.dirname(os.path.dirname(os.path.dirname(HERE)))
+sys.path.insert(0, os.path.join(ROOT, "packages", "basemap"))
+import utils  # noqa: E402  # pylint: disable=imports
+
+
+def main():
+    """Build the GEOS library based on parsed environment variables."""
+
+    geos_version = os.environ.get("GEOS_VERSION", None)
+    if geos_version is None:
+        raise ValueError("Undefined environment variable GEOS_VERSION")
+
+    geos_dir = os.environ.get("GEOS_DIR", None)
+    if geos_dir is None:
+        raise ValueError("Undefined environment variable GEOS_DIR")
+
+    geos_njobs = int(os.environ.get("GEOS_NJOBS", 1))
+
+    # pylint: disable=consider-using-f-string
+    print("Running before_all script with the following settings:")
+    print("GEOS_DIR: {0}".format(geos_dir))
+    print("GEOS_VERSION: {0}".format(geos_version))
+    print("GEOS_NJOBS: {0}".format(geos_njobs))
+
+    utils.GeosLibrary(geos_version).build(geos_dir, njobs=geos_njobs)
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d9bdc4fa9..b14c8acd8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,66 @@ https://keepachangelog.com/en/1.0.0/
 https://semver.org/spec/v2.0.0.html
 
 
+## [Unreleased]
+
+### Added
+- Python 3.13 support (PR [#619], solves issue [#608]).
+- NumPy 2.0 support (PR [#614] by @cvanelteren, solves issue [#604]).
+- Automated wheels for x86_64 and arm64 (PR [#620] by @cvanelteren,
+  solves issue [#608]).
+
+### Changed
+- **BREAKING CHANGE**: Set Python minimum supported version to 3.9.
+- **BREAKING CHANGE**: Migrate `basemap` libraries to use implicit
+  namespace packages (PR [#576] by @ksunden).
+- Migrate workflows to use `cibuildwheel` (PRs [#614] and [#618] by
+  @cvanelteren and PR [#621], solves GitHub artifact actions v1 sunset).
+- Update library dependencies:
+  - Upgrade upper limit for `basemap_data` to 3.0.
+  - Upgrade lower limit for `packaging` to 20.5.
+  - Upgrade upper limit for `packaging` to 25.0.
+  - Upgrade lower limit for `numpy` to 2.0.
+  - Upgrade upper limit for `numpy` to 2.3.
+  - Upgrade lower limit for `matplotlib` to 3.4.
+  - Upgrade upper limit for `matplotlib` to 3.11.
+  - Upgrade lower limit for `pyproj` to 3.0.
+  - Upgrade upper limit for `pyproj` to 3.8.
+  - Upgrade lower limit for `pyshp` to 2.0.
+- Update optional library dependencies:
+  - Upgrade lower limit for `pillow` to 10.3 due to
+    vulnerabilities [CVE-2023-50447] and [CVE-2024-28219].
+  - Upgrade upper limit for `pillow` to 11.2.
+  - Upgrade upper limit for `OWSLib` to 0.33.
+- Update doc dependencies:
+  - Upgrade upper limit for `sphinx` to 8.0.
+  - Upgrade lower limit for `furo` to 2023.9.10.
+  - Upgrade upper limit for `furo` to 2024.8.7.
+  - Upgrade lower limit for `scipy` to 1.6.
+  - Upgrade upper limit for `scipy` to 1.16.
+  - Upgrade upper limit for `netCDF4` to 1.8.0.
+- Update lint dependencies:
+  - Remove dependency on `unittest2`.
+  - Upgrade lower limit for `flake8` to 3.9.
+  - Upgrade upper limit for `flake8` to 7.2.
+  - Upgrade lower limit for `astroid` to 3.0.
+  - Upgrade upper limit for `astroid` to 3.4.
+  - Upgrade lower limit for `pylint` to 3.0.
+  - Upgrade upper limit for `pylint` to 3.4.
+- Update test dependencies:
+  - Remove dependency on `unittest2`.
+  - Upgrade lower limit for `pytest` to 7.0.
+  - Upgrade upper limit for `pytest` to 8.4.
+  - Upgrade lower limit for `pytest-cov` to 3.0.
+  - Upgrade upper limit for `pytest-cov` to 6.1.
+  - Downgrade lower limit for `coverage` to 5.0.
+  - Upgrade upper limit for `coverage` to 7.7.
+
+### Fixed
+- Fix Cython extension to use `noexcept` (PR [#615] by @cvanelteren).
+
+### Removed
+- Deprecated `bdist_wheel.universal` option when building wheels.
+
 ## [1.4.1] - 2024-02-15
 
 ### Changed
@@ -1096,6 +1156,22 @@ https://semver.org/spec/v2.0.0.html
 - Fix glitches in drawing of parallels and meridians.
 
 
+[#621]:
+https://github.com/matplotlib/basemap/pull/621
+[#620]:
+https://github.com/matplotlib/basemap/pull/620
+[#619]:
+https://github.com/matplotlib/basemap/pull/619
+[#618]:
+https://github.com/matplotlib/basemap/pull/618
+[#615]:
+https://github.com/matplotlib/basemap/pull/615
+[#614]:
+https://github.com/matplotlib/basemap/pull/614
+[#608]:
+https://github.com/matplotlib/basemap/issues/608
+[#604]:
+https://github.com/matplotlib/basemap/issues/604
 [#598]:
 https://github.com/matplotlib/basemap/pull/598
 [#595]:
@@ -1124,6 +1200,8 @@ https://github.com/matplotlib/basemap/pull/580
 https://github.com/matplotlib/basemap/issues/579
 [#577]:
 https://github.com/matplotlib/basemap/issues/577
+[#576]:
+https://github.com/matplotlib/basemap/pull/576
 [#574]:
 https://github.com/matplotlib/basemap/issues/574
 [#573]:
@@ -1296,6 +1374,10 @@ https://github.com/matplotlib/basemap/compare/v1.0.3rel...v1.0.4rel
 [1.0.3]:
 https://github.com/matplotlib/basemap/tree/v1.0.3rel
 
+[CVE-2024-28219]:
+https://nvd.nist.gov/vuln/detail/CVE-2024-28219
+[CVE-2023-50447]:
+https://nvd.nist.gov/vuln/detail/CVE-2023-50447
 [CVE-2023-27476]:
 https://nvd.nist.gov/vuln/detail/CVE-2023-27476
 [CVE-2022-45198]:
diff --git a/packages/basemap/LICENSE b/packages/basemap/LICENSE
index 120eb7e3f..68cbd3d24 100644
--- a/packages/basemap/LICENSE
+++ b/packages/basemap/LICENSE
@@ -1,5 +1,5 @@
 Copyright (c) 2011-2014 Jeffrey Whitaker
-Copyright (c) 2015-2024 The Matplotlib development team
+Copyright (c) 2015-2025 The Matplotlib development team
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
diff --git a/packages/basemap/doc/source/conf.py b/packages/basemap/doc/source/conf.py
index 460d15c92..daa4b1286 100644
--- a/packages/basemap/doc/source/conf.py
+++ b/packages/basemap/doc/source/conf.py
@@ -22,7 +22,7 @@
 # -- Project information -----------------------------------------------
 
 project = myself.__name__.rsplit(".", 1)[-1]
-copyright = "2011-2014 Jeffrey Whitaker; 2015-2024 The Matplotlib development team"
+copyright = "2011-2014 Jeffrey Whitaker; 2015-2025 The Matplotlib development team"
 author = "Jeffrey Whitaker"
 
 # The short X.Y version
diff --git a/packages/basemap/pyproject.toml b/packages/basemap/pyproject.toml
index 6a50e2c78..a7d900689 100644
--- a/packages/basemap/pyproject.toml
+++ b/packages/basemap/pyproject.toml
@@ -1,15 +1,9 @@
 [build-system]
 requires = [
-    'setuptools',
-    'wheel',
-    'numpy == 1.26.1; python_version >= "3.12"',
-    'numpy == 1.23.3; python_version == "3.11"',
-    'numpy == 1.21.4; python_version == "3.10"',
-    'numpy == 1.21.4; sys_platform == "darwin" and (python_version >= "3.7" and python_version <= "3.9")',
-    'numpy == 1.16.6; sys_platform != "darwin" and (python_version >= "3.7" and python_version <= "3.9")',
-    'numpy == 1.16.6; python_version == "2.7" or (python_version >= "3.4" and python_version <= "3.6")',
-    'numpy == 1.11.3; python_version == "2.6" or (python_version >= "3.2" and python_version <= "3.3")',
-    'cython >= 0.29, < 3.1; python_version >= "3.3" or python_version < "3.0"',
-    'cython >= 0.26, < 0.27; python_version == "3.2"'
+    'setuptools >= 67.0, < 76.0',
+    'wheel >= 0.40, < 0.46',
+    'cython >= 0.29.31, < 3.1',
+    'numpy == 2.1.0; python_version == "3.13"',
+    'numpy == 2.0.0; python_version <= "3.12"',
 ]
 build-backend = "setuptools.build_meta"
diff --git a/packages/basemap/requirements-doc.txt b/packages/basemap/requirements-doc.txt
index 385d1e158..e89d7e235 100644
--- a/packages/basemap/requirements-doc.txt
+++ b/packages/basemap/requirements-doc.txt
@@ -1,6 +1,6 @@
-sphinx >= 5.3, < 7.2; python_version >= "3.8"
-furo >= 2022.4.7, < 2023.9.11; python_version >= "3.8"
+sphinx >= 7.0, < 8.0
+furo >= 2023.9.10, < 2024.8.7
 
-scipy >= 1.2, < 1.12; python_version >= "3.5"
-cftime >= 1.4.0, < 1.7.0; python_version >= "3.6"
-netCDF4 >= 1.5.6, < 1.7.0; python_version >= "3.6"
+scipy >= 1.6, < 1.16
+cftime >= 1.4.0, < 1.7.0
+netCDF4 >= 1.5.6, < 1.8.0
diff --git a/packages/basemap/requirements-lint.txt b/packages/basemap/requirements-lint.txt
index 2b2a187c4..a13cd4285 100644
--- a/packages/basemap/requirements-lint.txt
+++ b/packages/basemap/requirements-lint.txt
@@ -1,17 +1,4 @@
-unittest2; python_version <= "3.9"
+flake8 >= 3.9, < 7.2
 
-flake8 >= 2.6, < 3.0; python_version == "2.6"
-flake8 >= 2.6, < 4.0; python_version == "2.7"
-flake8 >= 2.6, < 3.0; python_version == "3.2"
-flake8 >= 2.6, < 3.0; python_version == "3.3"
-flake8 >= 2.6, < 3.9; python_version == "3.4"
-flake8 >= 2.6, < 6.2; python_version >= "3.5"
-
-astroid >= 1.6, < 2.0; python_version == "2.7"
-astroid >= 2.4, < 2.5; python_version == "3.5"
-astroid >= 2.5, < 2.7; python_version == "3.6"
-astroid >= 2.8, < 3.1; python_version >= "3.7"
-pylint >= 1.9, < 2.0; python_version == "2.7"
-pylint >= 2.6, < 2.7; python_version == "3.5"
-pylint >= 2.7, < 2.10; python_version == "3.6"
-pylint >= 2.11, < 3.1; python_version >= "3.7"
+astroid >= 3.0, < 3.4
+pylint >= 3.0, < 3.4
diff --git a/packages/basemap/requirements-owslib.txt b/packages/basemap/requirements-owslib.txt
index 5c4f0439d..5c7425ee0 100644
--- a/packages/basemap/requirements-owslib.txt
+++ b/packages/basemap/requirements-owslib.txt
@@ -1,8 +1 @@
-ordereddict; python_version == "2.6"
-OWSLib >= 0.8.0, < 0.15.0; python_version == "2.6"
-OWSLib >= 0.8.0, < 0.19.0; python_version == "2.7"
-OWSLib >= 0.8.0, < 0.11.0; python_version == "3.2"
-OWSLib >= 0.8.0, < 0.11.0; python_version == "3.3"
-OWSLib >= 0.8.0, < 0.18.0; python_version == "3.4"
-OWSLib >= 0.8.0, < 0.20.0; python_version == "3.5"
-OWSLib >= 0.28.1, < 0.30.0; python_version >= "3.6"
+OWSLib >= 0.28.1, < 0.33
diff --git a/packages/basemap/requirements-pillow.txt b/packages/basemap/requirements-pillow.txt
index 647257799..89493b01d 100644
--- a/packages/basemap/requirements-pillow.txt
+++ b/packages/basemap/requirements-pillow.txt
@@ -1,8 +1 @@
-pillow >= 3.4.0, < 4.0.0; python_version == "2.6"
-pillow >= 6.2.2, < 7.0.0; python_version == "2.7"
-pillow >= 3.4.0, < 4.0.0; python_version == "3.2"
-pillow >= 4.3.0, < 5.0.0; python_version == "3.3"
-pillow >= 5.4.0, < 6.0.0; python_version == "3.4"
-pillow >= 7.1.0, < 8.0.0; python_version == "3.5"
-pillow >= 8.3.2, < 9.0.0; python_version == "3.6"
-pillow >= 9.4.0, < 10.2.0; python_version >= "3.7"
+pillow >= 10.3, < 11.2
diff --git a/packages/basemap/requirements-setup.txt b/packages/basemap/requirements-setup.txt
index 6f39a1a05..d12bb0661 100644
--- a/packages/basemap/requirements-setup.txt
+++ b/packages/basemap/requirements-setup.txt
@@ -1,2 +1 @@
-cython >= 0.29, < 3.1; python_version >= "3.3" or python_version < "3.0"
-cython >= 0.26, < 0.27; python_version == "3.2"
+cython >= 0.29.31, < 3.1
diff --git a/packages/basemap/requirements-test.txt b/packages/basemap/requirements-test.txt
index 7491b2686..6a0458527 100644
--- a/packages/basemap/requirements-test.txt
+++ b/packages/basemap/requirements-test.txt
@@ -1,23 +1,4 @@
-unittest2; python_version <= "3.9"
+pytest >= 7.0, < 8.4
 
-pytest >= 3.2.0, < 3.3; python_version == "2.6"
-pytest >= 4.6.9, < 5.0; python_version == "2.7"
-pytest >= 2.9.0, < 3.0; python_version == "3.2"
-pytest >= 3.2.0, < 3.3; python_version == "3.3"
-pytest >= 4.6.9, < 5.0; python_version == "3.4"
-pytest >= 6.1.2, < 6.2; python_version == "3.5"
-pytest >= 6.2.5, < 7.5; python_version >= "3.6"
-
-coverage >= 4.5, < 5.0; python_version == "2.6"
-coverage >= 5.5, < 6.0; python_version == "2.7"
-coverage >= 3.7, < 4.0; python_version == "3.2"
-coverage >= 4.5, < 5.0; python_version == "3.3"
-coverage >= 4.5, < 5.0; python_version == "3.4"
-coverage >= 5.5, < 6.0; python_version == "3.5"
-coverage >= 5.5, < 7.4; python_version >= "3.6"
-pytest-cov >= 2.5, < 2.6; python_version == "2.6"
-pytest-cov >= 2.9, < 3.0; python_version == "2.7"
-pytest-cov >= 2.5, < 2.6; python_version == "3.2"
-pytest-cov >= 2.5, < 2.6; python_version == "3.3"
-pytest-cov >= 2.5, < 2.9; python_version == "3.4"
-pytest-cov >= 2.9, < 4.2; python_version >= "3.5"
+pytest-cov >= 3.0, < 6.1
+coverage >= 5.0, < 7.7
diff --git a/packages/basemap/requirements.txt b/packages/basemap/requirements.txt
index 3c028489e..3f20dc53c 100644
--- a/packages/basemap/requirements.txt
+++ b/packages/basemap/requirements.txt
@@ -1,38 +1,8 @@
-basemap_data >= 1.3.2, < 1.4
+basemap_data >= 1.3.2, < 3.0
+packaging >= 20.5, < 25.0
 
-numpy >= 1.11, < 1.12; python_version == "2.6"
-numpy >= 1.16, < 1.17; python_version == "2.7"
-numpy >= 1.11, < 1.12; python_version == "3.2"
-numpy >= 1.11, < 1.12; python_version == "3.3"
-numpy >= 1.15, < 1.17; python_version == "3.4"
-numpy >= 1.16, < 1.19; python_version == "3.5"
-numpy >= 1.19, < 1.20; python_version == "3.6"
-numpy >= 1.21, < 1.22; python_version == "3.7"
-numpy >= 1.21, < 1.27; python_version >= "3.8"
+numpy >= 2.0, < 2.3
+matplotlib >= 3.4, < 3.11
 
-cycler < 0.11; python_version == "3.2"
-pyparsing >= 1.5, < 2.4.1; python_version == "2.6"
-pyparsing >= 1.5, < 2.3.1; python_version == "3.2"
-matplotlib >= 1.5, < 2.0; python_version == "2.6"
-matplotlib >= 1.5, < 3.0; python_version == "2.7"
-matplotlib >= 1.5, < 2.0; python_version == "3.2"
-matplotlib >= 1.5, < 2.0; python_version == "3.3"
-matplotlib >= 1.5, < 3.0; python_version == "3.4"
-matplotlib >= 1.5, < 3.9; python_version >= "3.5"
-
-pyproj >= 1.9.3, < 2.1.0; python_version == "2.6"
-pyproj >= 1.9.3, < 2.2.0; python_version == "2.7"
-pyproj >= 1.9.3, < 1.9.6; python_version == "3.2"
-pyproj >= 1.9.3, < 2.1.0; python_version == "3.3"
-pyproj >= 1.9.3, < 2.1.0; python_version == "3.4"
-pyproj >= 1.9.3, < 3.7.0; python_version >= "3.5"
-
-pyshp >= 1.2, < 2.0; python_version == "2.6"
-pyshp >= 1.2, < 2.4; python_version >= "2.7"
-
-packaging >= 16.0, < 17.0; python_version == "2.6"
-packaging >= 16.0, < 21.0; python_version == "2.7"
-packaging >= 16.0, < 17.0; python_version == "3.2"
-packaging >= 16.0, < 17.0; python_version == "3.3"
-packaging >= 16.0, < 21.0; python_version == "3.4"
-packaging >= 16.0, < 24.0; python_version >= "3.5"
+pyproj >= 3.0, < 3.8
+pyshp >= 2.0, < 2.4
diff --git a/packages/basemap/setup.cfg b/packages/basemap/setup.cfg
index 58e39b69a..643dee05f 100644
--- a/packages/basemap/setup.cfg
+++ b/packages/basemap/setup.cfg
@@ -22,11 +22,6 @@ ignore =
 [tool:pytest]
 filterwarnings =
     error
-    # To be removed when replacing `unittest2`.
-    ignore:Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated:DeprecationWarning:unittest2.compatibility:143
-    # To be removed with `dateutil` release after 2.8.2.
-    # See: https://github.com/dateutil/dateutil/issues/1314
-    ignore:datetime.datetime.utcfromtimestamp\(\) is deprecated:DeprecationWarning:dateutil.tz.tz:37
 
 [coverage:paths]
 source =
diff --git a/packages/basemap/setup.py b/packages/basemap/setup.py
index 4c98a8776..8927ac115 100644
--- a/packages/basemap/setup.py
+++ b/packages/basemap/setup.py
@@ -10,16 +10,10 @@
 import glob
 import warnings
 from setuptools import setup
-from setuptools import find_packages
+from setuptools import find_namespace_packages
 from setuptools.command.sdist import sdist
 from setuptools.extension import Extension
 
-try:
-    import Cython
-    cython_major_version = int(Cython.__version__.split(".", 1)[0])
-except ImportError:
-    cython_major_version = 0
-
 
 def get_content(name, splitlines=False):
     """Return the file contents with project root as root folder."""
@@ -162,28 +156,7 @@ def run(self):
 for ext in ext_modules:
     ext.cython_directives = [
         ("language_level", str(sys.version_info[0])),
-        ("legacy_implicit_noexcept", True),
-    ][:1 + int(cython_major_version >= 3)]
-
-# Define all the different requirements.
-setup_requires = get_content("requirements-setup.txt", splitlines=True)
-install_requires = get_content("requirements.txt", splitlines=True)
-if sys.version_info[:2] == (3, 2):
-    # Hack for Python 3.2 because pip < 8 cannot handle version markers.
-    marker1 = '; python_version == "3.2"'
-    marker2 = '; python_version >= "2.7"'
-    setup_requires = [
-        item.replace(marker1, "").replace(marker2, "") for item in setup_requires
-        if item.endswith(marker1) or item.endswith(marker2)
-        or "python_version" not in item]
-    install_requires = [
-        item.replace(marker1, "").replace(marker2, "") for item in install_requires
-        if item.endswith(marker1) or item.endswith(marker2)
-        or "python_version" not in item]
-else:
-    marker1 = '; python_version == "3.2"'
-    setup_requires = [item for item in setup_requires if not item.endswith(marker1)]
-    install_requires = [item for item in install_requires if not item.endswith(marker1)]
+    ]
 
 setup(**{
     "name":
@@ -214,7 +187,6 @@ def run(self):
         "Intended Audience :: Science/Research",
         "License :: OSI Approved :: MIT License",
         "Operating System :: OS Independent",
-        "Programming Language :: Python :: 2",
         "Programming Language :: Python :: 3",
         "Topic :: Scientific/Engineering :: Visualization",
         "Topic :: Software Development :: Libraries :: Python Modules",
@@ -224,28 +196,23 @@ def run(self):
         "maps",
         "plots",
     ],
-    "namespace_packages": [
-        "mpl_toolkits",
-    ],
     "package_dir":
         {"": "src"},
     "packages":
-        find_packages(where="src"),
+        find_namespace_packages(where="src"),
     "ext_modules":
         ext_modules,
     "data_files":
         data_files,
     "python_requires":
         ", ".join([
-            ">=2.6",
-            "!=3.0.*",
-            "!=3.1.*",
-            "<3.13",
+            ">=3.9",
+            "<3.14",
         ]),
     "setup_requires":
-        setup_requires,
+        get_content("requirements-setup.txt", splitlines=True),
     "install_requires":
-        install_requires,
+        get_content("requirements.txt", splitlines=True),
     "extras_require": {
         "doc":
             get_content("requirements-doc.txt", splitlines=True),
diff --git a/packages/basemap/src/_geoslib.pyx b/packages/basemap/src/_geoslib.pyx
index 1e2ced532..1298e6e91 100644
--- a/packages/basemap/src/_geoslib.pyx
+++ b/packages/basemap/src/_geoslib.pyx
@@ -2,7 +2,7 @@ import sys
 import numpy
 cimport numpy as cnp
 
-__version__ = "1.4.1"
+__version__ = "2.0.0-dev"
 
 
 # Need some Python C-API functions for strings.
@@ -112,7 +112,7 @@ cdef extern from "geos_c.h":
 # Cython 3: Next cdef needs "noexcept" declaration unless
 # the compiler directive "legacy_implicit_noexcept" is used
 # ("noexcept" syntax supported since Cython 0.29.31).
-cdef void notice_h(const char *fmt, ...):
+cdef void notice_h(const char *fmt, ...) noexcept:
     pass
     #format = PyBytes_FromString(fmt)
     #message = PyBytes_FromString(msg)
diff --git a/packages/basemap/src/mpl_toolkits/__init__.py b/packages/basemap/src/mpl_toolkits/__init__.py
deleted file mode 100644
index b5cd40f18..000000000
--- a/packages/basemap/src/mpl_toolkits/__init__.py
+++ /dev/null
@@ -1,6 +0,0 @@
-from __future__ import (absolute_import, division, print_function)
-
-try:
-    __import__('pkg_resources').declare_namespace(__name__)
-except ImportError:
-    pass # must not have setuptools
diff --git a/packages/basemap/src/mpl_toolkits/basemap/__init__.py b/packages/basemap/src/mpl_toolkits/basemap/__init__.py
index 651a2dd5a..3f61c2c4f 100644
--- a/packages/basemap/src/mpl_toolkits/basemap/__init__.py
+++ b/packages/basemap/src/mpl_toolkits/basemap/__init__.py
@@ -48,7 +48,7 @@
 from . proj import Proj
 
 
-__version__ = "1.4.1"
+__version__ = "2.0.0-dev"
 
 # basemap data files now installed in lib/matplotlib/toolkits/basemap/data
 # check to see if environment variable BASEMAPDATA set to a directory,
diff --git a/packages/basemap/test/__init__.py b/packages/basemap/test/__init__.py
deleted file mode 100644
index e69de29bb..000000000
diff --git a/packages/basemap/test/mpl_toolkits/__init__.py b/packages/basemap/test/mpl_toolkits/__init__.py
deleted file mode 100644
index e69de29bb..000000000
diff --git a/packages/basemap/test/mpl_toolkits/basemap/test_Basemap.py b/packages/basemap/test/mpl_toolkits/basemap/test_Basemap.py
index 6a94d291f..f18b2c29e 100644
--- a/packages/basemap/test/mpl_toolkits/basemap/test_Basemap.py
+++ b/packages/basemap/test/mpl_toolkits/basemap/test_Basemap.py
@@ -4,10 +4,7 @@
 import shutil
 import tempfile
 import datetime as dt
-try:
-    import unittest2 as unittest
-except ImportError:
-    import unittest
+import unittest
 
 import numpy as np
 import matplotlib as mpl
diff --git a/packages/basemap/test/mpl_toolkits/basemap/test_cm.py b/packages/basemap/test/mpl_toolkits/basemap/test_cm.py
index 77df7d3bf..66d8ef665 100644
--- a/packages/basemap/test/mpl_toolkits/basemap/test_cm.py
+++ b/packages/basemap/test/mpl_toolkits/basemap/test_cm.py
@@ -1,10 +1,6 @@
 """Import test for :mod:`mpl_toolkits.basemap.cm`."""
 
-try:
-    import unittest2 as unittest
-except ImportError:
-    import unittest
-
+import unittest
 from mpl_toolkits.basemap import cm
 
 
diff --git a/packages/basemap/test/mpl_toolkits/basemap/test_diagnostic.py b/packages/basemap/test/mpl_toolkits/basemap/test_diagnostic.py
index b5bacce3a..f5ac65564 100644
--- a/packages/basemap/test/mpl_toolkits/basemap/test_diagnostic.py
+++ b/packages/basemap/test/mpl_toolkits/basemap/test_diagnostic.py
@@ -1,11 +1,7 @@
 """Import test for :mod:`mpl_toolkits.basemap.diagnostic`."""
 
+import unittest
 from collections import namedtuple
-try:
-    import unittest2 as unittest
-except ImportError:
-    import unittest
-
 from mpl_toolkits.basemap import diagnostic
 
 
diff --git a/packages/basemap/test/mpl_toolkits/basemap/test_proj.py b/packages/basemap/test/mpl_toolkits/basemap/test_proj.py
index dfdcd69ba..4385c8f6f 100644
--- a/packages/basemap/test/mpl_toolkits/basemap/test_proj.py
+++ b/packages/basemap/test/mpl_toolkits/basemap/test_proj.py
@@ -1,10 +1,6 @@
 """Import test for :mod:`mpl_toolkits.basemap.proj`."""
 
-try:
-    import unittest2 as unittest
-except ImportError:
-    import unittest
-
+import unittest
 from mpl_toolkits.basemap.proj import Proj
 
 
diff --git a/packages/basemap/test/mpl_toolkits/test_basemap.py b/packages/basemap/test/mpl_toolkits/test_basemap.py
index 80a31cb2e..2070c2e50 100644
--- a/packages/basemap/test/mpl_toolkits/test_basemap.py
+++ b/packages/basemap/test/mpl_toolkits/test_basemap.py
@@ -1,10 +1,6 @@
 """Import test for the :mod:`mpl_toolkits.basemap` package."""
 
-try:
-    import unittest2 as unittest
-except ImportError:
-    import unittest
-
+import unittest
 from mpl_toolkits import basemap
 
 
diff --git a/packages/basemap/utils/GeosLibrary.py b/packages/basemap/utils/GeosLibrary.py
index 4db6b88e9..0462d6775 100644
--- a/packages/basemap/utils/GeosLibrary.py
+++ b/packages/basemap/utils/GeosLibrary.py
@@ -1,7 +1,7 @@
 #! /usr/bin/env python
 # -*- coding: utf-8 -*-
 #
-# Copyright (c) 2021-2024 Víctor Molina García
+# Copyright (c) 2021-2025 Víctor Molina García
 #
 # GeosLibrary.py is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Lesser General Public License as published
@@ -62,7 +62,7 @@ def __init__(self, version, root=None):
     def __del__(self):
         """Clean up after :class:`GeosLibrary` destruction."""
 
-        if self.temp:
+        if getattr(self, "temp", None) and getattr(self, "root", None):
             try:
                 shutil.rmtree(self.root)
             except OSError:
diff --git a/packages/basemap_data/setup.cfg b/packages/basemap_data/setup.cfg
index 46fc44d00..e22ef7143 100644
--- a/packages/basemap_data/setup.cfg
+++ b/packages/basemap_data/setup.cfg
@@ -7,6 +7,3 @@ license_files =
 
 [sdist]
 formats = zip
-
-[bdist_wheel]
-universal = 1
diff --git a/packages/basemap_data/setup.py b/packages/basemap_data/setup.py
index 2d8e4e620..d56dd243d 100644
--- a/packages/basemap_data/setup.py
+++ b/packages/basemap_data/setup.py
@@ -7,7 +7,7 @@
 import os
 import itertools
 from setuptools import setup
-from setuptools import find_packages
+from setuptools import find_namespace_packages
 
 
 def get_content(name, splitlines=False):
@@ -73,7 +73,7 @@ def get_content(name, splitlines=False):
     "name":
         "basemap_data",
     "version":
-        "1.3.2",
+        "2.0.0-dev",
     "license":
         "GNU Lesser General Public License v3 or later (LGPLv3+)",
     "description":
@@ -98,7 +98,6 @@ def get_content(name, splitlines=False):
         "Intended Audience :: Science/Research",
         "License :: OSI Approved :: GNU Lesser General Public License v3 or later (LGPLv3+)",
         "Operating System :: OS Independent",
-        "Programming Language :: Python :: 2",
         "Programming Language :: Python :: 3",
         "Topic :: Scientific/Engineering :: Visualization",
         "Topic :: Software Development :: Libraries :: Python Modules",
@@ -108,22 +107,17 @@ def get_content(name, splitlines=False):
         "maps",
         "plots",
     ],
-    "namespace_packages": [
-        "mpl_toolkits.basemap_data",
-    ],
     "package_dir":
         {"": "src"},
     "packages":
-        find_packages(where="src"),
+        find_namespace_packages(where="src"),
     "package_data": {
         "mpl_toolkits.basemap_data":
             data_files,
     },
     "python_requires":
         ", ".join([
-            ">=2.6",
-            "!=3.0.*",
-            "!=3.1.*",
+            ">=3.9",
             "<4",
         ]),
     "project_urls": {
diff --git a/packages/basemap_data/src/__init__.py b/packages/basemap_data/src/__init__.py
deleted file mode 100644
index e69de29bb..000000000
diff --git a/packages/basemap_data/src/mpl_toolkits/__init__.py b/packages/basemap_data/src/mpl_toolkits/__init__.py
deleted file mode 100644
index 02de4115d..000000000
--- a/packages/basemap_data/src/mpl_toolkits/__init__.py
+++ /dev/null
@@ -1,4 +0,0 @@
-try:
-    __import__('pkg_resources').declare_namespace(__name__)
-except ImportError:
-    pass  # must not have setuptools
diff --git a/packages/basemap_data/src/mpl_toolkits/basemap_data/__init__.py b/packages/basemap_data/src/mpl_toolkits/basemap_data/__init__.py
deleted file mode 100644
index 02de4115d..000000000
--- a/packages/basemap_data/src/mpl_toolkits/basemap_data/__init__.py
+++ /dev/null
@@ -1,4 +0,0 @@
-try:
-    __import__('pkg_resources').declare_namespace(__name__)
-except ImportError:
-    pass  # must not have setuptools
diff --git a/packages/basemap_data_hires/setup.cfg b/packages/basemap_data_hires/setup.cfg
index e408a4da9..e43de0337 100644
--- a/packages/basemap_data_hires/setup.cfg
+++ b/packages/basemap_data_hires/setup.cfg
@@ -5,6 +5,3 @@ license_files =
 
 [sdist]
 formats = zip
-
-[bdist_wheel]
-universal = 1
diff --git a/packages/basemap_data_hires/setup.py b/packages/basemap_data_hires/setup.py
index 7dbe83cf6..7421194d1 100644
--- a/packages/basemap_data_hires/setup.py
+++ b/packages/basemap_data_hires/setup.py
@@ -7,7 +7,7 @@
 import os
 import itertools
 from setuptools import setup
-from setuptools import find_packages
+from setuptools import find_namespace_packages
 
 
 def get_content(name, splitlines=False):
@@ -51,7 +51,7 @@ def get_content(name, splitlines=False):
     "name":
         "basemap_data_hires",
     "version":
-        "1.3.2",
+        "2.0.0-dev",
     "license":
         "GNU Lesser General Public License v3 or later (LGPLv3+)",
     "description":
@@ -76,7 +76,6 @@ def get_content(name, splitlines=False):
         "Intended Audience :: Science/Research",
         "License :: OSI Approved :: GNU Lesser General Public License v3 or later (LGPLv3+)",
         "Operating System :: OS Independent",
-        "Programming Language :: Python :: 2",
         "Programming Language :: Python :: 3",
         "Topic :: Scientific/Engineering :: Visualization",
         "Topic :: Software Development :: Libraries :: Python Modules",
@@ -86,22 +85,17 @@ def get_content(name, splitlines=False):
         "maps",
         "plots",
     ],
-    "namespace_packages": [
-        "mpl_toolkits.basemap_data",
-    ],
     "package_dir":
         {"": "src"},
     "packages":
-        find_packages(where="src"),
+        find_namespace_packages(where="src"),
     "package_data": {
         "mpl_toolkits.basemap_data":
             data_files,
     },
     "python_requires":
         ", ".join([
-            ">=2.6",
-            "!=3.0.*",
-            "!=3.1.*",
+            ">=3.9",
             "<4",
         ]),
     "project_urls": {
diff --git a/packages/basemap_data_hires/src/__init__.py b/packages/basemap_data_hires/src/__init__.py
deleted file mode 100644
index e69de29bb..000000000
diff --git a/packages/basemap_data_hires/src/mpl_toolkits/__init__.py b/packages/basemap_data_hires/src/mpl_toolkits/__init__.py
deleted file mode 100644
index 02de4115d..000000000
--- a/packages/basemap_data_hires/src/mpl_toolkits/__init__.py
+++ /dev/null
@@ -1,4 +0,0 @@
-try:
-    __import__('pkg_resources').declare_namespace(__name__)
-except ImportError:
-    pass  # must not have setuptools
diff --git a/packages/basemap_data_hires/src/mpl_toolkits/basemap_data/__init__.py b/packages/basemap_data_hires/src/mpl_toolkits/basemap_data/__init__.py
deleted file mode 100644
index 02de4115d..000000000
--- a/packages/basemap_data_hires/src/mpl_toolkits/basemap_data/__init__.py
+++ /dev/null
@@ -1,4 +0,0 @@
-try:
-    __import__('pkg_resources').declare_namespace(__name__)
-except ImportError:
-    pass  # must not have setuptools