diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index 7fa0636..b9fddb8 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -18,7 +18,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Build wheels
-        uses: pypa/cibuildwheel@v2.16.2
+        uses: pypa/cibuildwheel@v2.21.2
         env:
           CIBW_SKIP: pp*
           CIBW_TEST_COMMAND: python -m unittest discover ephem
diff --git a/.github/workflows/github-deploy.yml b/.github/workflows/github-deploy.yml
index c557c3f..ecd955f 100644
--- a/.github/workflows/github-deploy.yml
+++ b/.github/workflows/github-deploy.yml
@@ -52,21 +52,31 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: actions/setup-python@v4
+      - uses: actions/setup-python@v5
         name: Install Python
         with:
           python-version: '3.8'
 
+      - name: Generate build name for artifact upload
+        id: build-name
+        run: |
+          name=""
+          if [[ -n "${{ matrix.build }}" ]]; then
+            name="-$(echo ${{ matrix.build }} | tr -d *-_)"
+          fi
+          echo "name: ${name}"
+          echo "name=${name}" >> $GITHUB_OUTPUT
+
       # https://cibuildwheel.readthedocs.io/en/stable/faq/#emulation
       # offers this stanza plus “CIBW_ARCHS_LINUX” below:
       - name: Set up QEMU
         if: runner.os == 'Linux'
-        uses: docker/setup-qemu-action@v1
+        uses: docker/setup-qemu-action@v3
         with:
           platforms: all
 
       - name: Build wheels
-        uses: pypa/cibuildwheel@v2.16.2
+        uses: pypa/cibuildwheel@v2.21.2
         env:
           CIBW_ARCHS: ${{ matrix.arch }}
           CIBW_BUILD: ${{ matrix.build }}
@@ -75,9 +85,11 @@ jobs:
           CIBW_TEST_REQUIRES: tzdata
           CIBW_TEST_SKIP: "*-macosx_arm64 *-macosx_universal2:arm64"
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         with:
+          name: wheels-${{ matrix.os }}-${{ matrix.arch }}${{ steps.build-name.outputs.name }}
           path: ./wheelhouse/*.whl
+          overwrite: true
 
   build_sdist:
     name: Build source distribution
@@ -85,7 +97,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: actions/setup-python@v4
+      - uses: actions/setup-python@v5
         name: Install Python
         with:
           python-version: '3.8'
@@ -93,22 +105,25 @@ jobs:
       - name: Build sdist
         run: python setup.py sdist
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
+          name: wheels-sdist
           path: dist/*.tar.gz
+          overwrite: true
 
   upload_pypi:
     needs: [build_wheels, build_sdist]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
-          name: artifact
+          pattern: wheels-*
           path: dist
+          merge-multiple: true
 
-      - uses: pypa/gh-action-pypi-publish@master
+      - uses: pypa/gh-action-pypi-publish@release/v1
         with:
-          skip_existing: true
+          skip-existing: true
           user: __token__
           password: ${{ secrets.pypi_password }}
           # To test: repository_url: https://test.pypi.org/legacy/
diff --git a/setup.py b/setup.py
index ec0b836..0d44e25 100644
--- a/setup.py
+++ b/setup.py
@@ -79,6 +79,7 @@
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
+        'Programming Language :: Python :: 3.13',
         ],
       packages = [ 'ephem', 'ephem.tests' ],
       package_data = { 'ephem': ['doc/*.rst',