diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 1f496892ae2..6a7d627f0f8 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -43,7 +43,9 @@ jobs:
           # with the commit diff, because the merge may affect line numbers.
           ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.sha }}
 
-      - name: Set up Python ${{ inputs.python-version }}
+      # installs using setup-python do not work for arm macOS 3.9 and below
+      - if: ${{ !(inputs.os == 'macos-latest' && contains(fromJSON('["3.7", "3.8", "3.9"]'), inputs.python-version) && inputs.python-architecture == 'x64') }}
+        name: Set up Python ${{ inputs.python-version }}
         uses: actions/setup-python@v5
         with:
           python-version: ${{ inputs.python-version }}
@@ -51,6 +53,13 @@ jobs:
           # PyPy can have FFI changes within Python versions, which creates pain in CI
           check-latest: ${{ startsWith(inputs.python-version, 'pypy') }}
 
+      # workaround for the above, only available for 3.9
+      - if: ${{ inputs.os == 'macos-latest' && contains(fromJSON('["3.9"]'), inputs.python-version) && inputs.python-architecture == 'x64' }}
+        name: Set up Python ${{ inputs.python-version }}
+        uses: astral-sh/setup-uv@v5
+        with:
+          python-version: cpython-${{ inputs.python-version }}-macos-x86-64
+
       - name: Install nox
         run: python -m pip install --upgrade pip && pip install nox[uv]
 
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 989f2344c94..fe814d42665 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -146,17 +146,13 @@ jobs:
       matrix:
         rust: [stable]
         python-version: ["3.13"]
-        platform: [
+        platform:
+          [
             {
-              os: "macos-latest", # first available arm macos runner
+              os: "macos-latest",
               python-architecture: "arm64",
               rust-target: "aarch64-apple-darwin",
             },
-            {
-              os: "macos-13", # last available x86_64 macos runner
-              python-architecture: "x64",
-              rust-target: "x86_64-apple-darwin",
-            },
             {
               os: "ubuntu-latest",
               python-architecture: "x64",
@@ -316,7 +312,7 @@ jobs:
             python-version: "3.13"
             platform:
               {
-                os: "macos-13",
+                os: "macos-latest",
                 python-architecture: "x64",
                 rust-target: "x86_64-apple-darwin",
               }
@@ -330,32 +326,17 @@ jobs:
                 rust-target: "x86_64-unknown-linux-gnu",
               }
 
-          # arm64 macOS Python not available on GitHub Actions until 3.10
-          # so backfill 3.7-3.9 with x64 macOS runners
-          - rust: stable
-            python-version: "3.7"
-            platform:
-              {
-                os: "macos-13",
-                python-architecture: "x64",
-                rust-target: "x86_64-apple-darwin",
-              }
-          - rust: stable
-            python-version: "3.8"
-            platform:
-              {
-                os: "macos-13",
-                python-architecture: "x64",
-                rust-target: "x86_64-apple-darwin",
-              }
-          - rust: stable
-            python-version: "3.9"
-            platform:
-              {
-                os: "macos-13",
-                python-architecture: "x64",
-                rust-target: "x86_64-apple-darwin",
-              }
+          # arm64 macOS Python not available on GitHub Actions until 3.10,
+          # and 3.7 & 3.8 not available to install from uv, but can backfill 3.9 with x64 from uv
+          # FIXME: setup-uv issue prevents this from working, https://github.com/astral-sh/setup-uv/issues/554
+          # - rust: stable
+          #   python-version: "3.9"
+          #   platform:
+          #     {
+          #       os: "macos-latest",
+          #       python-architecture: "x64",
+          #       rust-target: "x86_64-apple-darwin",
+          #     }
           # arm64 Linux runner is in public preview, so test 3.13 on it
           - rust: stable
             python-version: "3.13"
@@ -618,12 +599,6 @@ jobs:
           - os: "ubuntu-latest"
             target: "x86_64-pc-windows-gnu"
             flags: "-i python3.13 --features generate-import-lib"
-          # macos x86_64 -> aarch64
-          - os: "macos-13" # last x86_64 macos runners
-            target: "aarch64-apple-darwin"
-          # macos aarch64 -> x86_64
-          - os: "macos-latest"
-            target: "x86_64-apple-darwin"
           # windows x86_64 -> aarch64
           - os: "windows-latest"
             target: "aarch64-pc-windows-msvc"