diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 565bf3a..95656fa 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -87,8 +87,6 @@ jobs:
         pyversion: ["cp"]
 
         include:
-          - image: manylinux_2_24_aarch64
-            pyversion: "cp37"
           - image: manylinux_2_24_aarch64
             pyversion: "cp38"
           - image: manylinux_2_24_aarch64
@@ -123,12 +121,6 @@ jobs:
     - name: Copy wheels in dist
       run: cp -v wheelhouse*/*-m*linux*.whl dist/  # manylinux / musllinux
 
-    - name: Release
-      uses: softprops/action-gh-release@v2
-      if: github.ref_type == 'tag'
-      with:
-        files: dist/*cp27*.whl, dist/*cp35*.whl, dist/*cp36*.whl
-
     - name: Archive Wheels
       uses: actions/upload-artifact@v4
       with:
diff --git a/.github/workflows/wheels.yml b/.github/workflows/wheels.yml
index 5ce92e3..6326f8d 100644
--- a/.github/workflows/wheels.yml
+++ b/.github/workflows/wheels.yml
@@ -71,7 +71,7 @@ jobs:
       - uses: actions/checkout@v4
       - name: Install cibuildwheel
         # Nb. keep cibuildwheel version pin consistent with job below
-        run: pipx install cibuildwheel==2.17.0
+        run: pipx install cibuildwheel==2.21.3
       - id: set-matrix
         run: |
           MATRIX=$(
@@ -107,14 +107,14 @@ jobs:
           platforms: all
 
       - name: Build wheels
-        uses: pypa/cibuildwheel@v2.17.0
+        uses: pypa/cibuildwheel@v2.21.3
         with:
           only: ${{ matrix.only }}
 
       - name: Build faster Linux wheels
         # also build wheels with the most recent manylinux images and gcc
         if: runner.os == 'Linux' && !contains(matrix.only, 'i686')
-        uses: pypa/cibuildwheel@v2.17.0
+        uses: pypa/cibuildwheel@v2.21.3
         env:
           CIBW_MANYLINUX_X86_64_IMAGE: manylinux_2_28
           CIBW_MANYLINUX_AARCH64_IMAGE: manylinux_2_28
diff --git a/pyproject.toml b/pyproject.toml
index 4a69995..48c1cf2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,7 +3,7 @@ requires = ["Cython>=3.0.10, < 3.1.0", "setuptools", "wheel"]
 
 [tool.cibuildwheel]
 build-verbosity = 2
-skip = ["pp*", "*-musllinux_i686"]
+skip = ["pp*", "*-musllinux_i686", "cp35*", "cp36*", "cp37*"]
 # test-command = "python -m unittest {package}/test_fractions.py -p -v"
 
 [tool.cibuildwheel.linux]
@@ -38,4 +38,5 @@ archs = ["AMD64", "x86"]
 # https://cibuildwheel.readthedocs.io/en/stable/faq/#what-to-provide suggests to provide
 # x86_64 and one of universal2 or arm64 wheels.  x86_64 is still required by older pips,
 # so additional arm64 wheels suffice.
+#archs = ["x86_64", "universal2"]
 archs = ["x86_64", "arm64"]