diff --git a/action.yml b/action.yml
index 4725f0571..e543f3418 100644
--- a/action.yml
+++ b/action.yml
@@ -31,25 +31,27 @@ runs:
         python-version: "3.8 - 3.12"
         update-environment: false
 
-    - id: pipx-unix
+    - id: pipx
       run: |
-        '${{ steps.python.outputs.python-path }}' -m venv --without-pip '${{ runner.temp }}/pipx4cibw'
-        '${{ steps.python.outputs.python-path }}' -m pip --python '${{ runner.temp }}/pipx4cibw/bin/python' install pipx
-        echo 'pipx-path=${{ runner.temp }}/pipx4cibw/bin/pipx' >> $GITHUB_OUTPUT
-      shell: bash
-      if: runner.os != 'Windows'
+        import os
+        import sys
 
-    - id: pipx-win
-      run: |
-        "${{ steps.python.outputs.python-path }}" -m venv --without-pip "${{ runner.temp }}\pipx4cibw"
-        "${{ steps.python.outputs.python-path }}" -m pip --python "${{ runner.temp }}\pipx4cibw\Scripts\python.exe" install pipx
-        echo "pipx-path=${{ runner.temp }}\pipx4cibw\Scripts\pipx.exe" >> $GITHUB_OUTPUT
-      shell: pwsh
-      if: runner.os == 'Windows'
+        from pathlib import Path
+        from subprocess import run
+
+        bin = "Scripts" if sys.platform == "win32" else "bin"
+        ext = ".exe" if sys.platform == "win32" else "bin"
+        temp = Path(r"${{ runner.temp }}")
+        run([sys.executable, "-m", "venv", "--without-pip", str(temp / "pipx4cibw")], check=True)
+        run([sys.executable, "-m", "pip", "--python", str(temp / "pipx4cibw" / bin / f"python{ext}"), "install", "pipx"], check=True)
+        pipx_path = temp / "pipx4cibw" / bin / f"pipx{ext}"
+        with open(os.environ["GITHUB_OUTPUT"], "at") as f:
+            f.write(f"pipx-path={pipx_path}\n")
+      shell: ${{ steps.python.outputs.python-path }} {0}
 
     # Redirecting stderr to stdout to fix interleaving issue in Actions.
     - run: >
-        '${{ steps.pipx-unix.outputs.pipx-path }}' run
+        '${{ steps.pipx.outputs.pipx-path }}' run
         --python '${{ steps.python.outputs.python-path }}'
         --spec '${{ github.action_path }}'
         cibuildwheel
@@ -63,7 +65,7 @@ runs:
 
     # Windows needs powershell to interact nicely with Meson
     - run: >
-        "${{ steps.pipx-win.outputs.pipx-path }}" run
+        "${{ steps.pipx.outputs.pipx-path }}" run
         --python "${{ steps.python.outputs.python-path }}"
         --spec "${{ github.action_path }}"
         cibuildwheel