diff --git a/.github/workflows/pypi.yml b/.github/workflows/pypi.yml
index 6f7e28b..4ab17c2 100644
--- a/.github/workflows/pypi.yml
+++ b/.github/workflows/pypi.yml
@@ -27,9 +27,9 @@ jobs:
       - name: Build wheels
         uses: pypa/cibuildwheel@v2.16.2
         env:
-          CIBW_BEFORE_BUILD_LINUX: "pip install numpy meson-python ninja setuptools build"
-          CIBW_BEFORE_BUILD_WINDOWS: "pip install numpy meson-python ninja setuptools build"
-          CIBW_BEFORE_BUILD_MACOS: "pip install numpy meson-python ninja setuptools build"
+          CIBW_BEFORE_BUILD_LINUX: "pip install --index-url https://test.pypi.org/simple/ --extra-index-url https://pypi.org/simple numpy meson-python ninja setuptools build"
+          CIBW_BEFORE_BUILD_WINDOWS: "pip install --index-url https://test.pypi.org/simple/ --extra-index-url https://pypi.org/simple numpy meson-python ninja setuptools build"
+          CIBW_BEFORE_BUILD_MACOS: "pip install --index-url https://test.pypi.org/simple/ --extra-index-url https://pypi.org/simple numpy meson-python ninja setuptools build"
         #    ...
         # with:
         #   package-dir: .