diff --git a/.github/workflows/python-release.yml b/.github/workflows/python-release.yml
index a26bb20..6180899 100644
--- a/.github/workflows/python-release.yml
+++ b/.github/workflows/python-release.yml
@@ -14,22 +14,31 @@ jobs:
         os:
           - ubuntu-latest
           - windows-latest
-          - macos-13
-          - macos-14
+          - macos-13 # x86_64
+          - macos-14 # aarch64
 
     steps:
       - uses: actions/checkout@v4
         with:
           submodules: recursive
 
+      # On Linux, use QEMU to build multiple platforms.
       - name: Setup QEMU
         if: runner.os == 'Linux'
         uses: docker/setup-qemu-action@v3
         with:
           platforms: all
 
+      # Need this for macos-14, which doesn't come with python for some reason.
       - name: Setup Python
         uses: actions/setup-python@v4
+        with:
+          python-version: '3.10'
+      
+      # Need this to get cl.exe on the path.
+      - name: Set up Visual Studio shell
+        if: runner.os == 'Windows'
+        uses: egor-tensin/vs-shell@v2
 
       - name: Install cibuildwheel
         run: python -m pip install cibuildwheel==2.16.5
@@ -37,18 +46,27 @@ jobs:
       - name: Build wheels
         run: python -m cibuildwheel --output-dir wheelhouse bindings/python
         env:
+
+          # We have QEMU setup and can build everything.
           CIBW_ARCHS_LINUX: x86_64 i686 aarch64
-          # musllinux uses apk & manylinux uses yum
+          # For some reason these don't use the same distro.
+          # musllinux uses apk & manylinux uses yum.
           CIBW_BEFORE_BUILD_LINUX: |
             if command -v apk > /dev/null; then
-              apk add --update clang && make -C src c_kzg_4844.o
+              apk add --update clang && make -C src blst
             elif command -v yum > /dev/null; then
-              yum install -y clang && make -C src c_kzg_4844.o
+              yum install -y clang && make -C src blst
             fi
+
+          # Building x86 (32-bit) package is difficult.
+          # We're missing the 32-bit Python library.
+          CIBW_ARCHS_WINDOWS: AMD64
+          # We need blst.lib (via MSVC) which our Makefile doesn't support.
           CIBW_BEFORE_BUILD_WINDOWS: |
-            make -C src c_kzg_4844.o
+            cd blst && build.bat && cp blst.lib ../lib && cp bindings/*.h ../inc
+
           CIBW_BEFORE_BUILD_MACOS: |
-            make -C src c_kzg_4844.o
+            make -C src blst
 
       - name: Publish to PyPI
         uses: pypa/gh-action-pypi-publish@release/v1