diff --git a/.github/workflows/pypi-release.yaml b/.github/workflows/pypi-release.yaml
index b9d47840967..7ca3826de95 100644
--- a/.github/workflows/pypi-release.yaml
+++ b/.github/workflows/pypi-release.yaml
@@ -76,7 +76,7 @@ jobs:
         run: |
           sleep 3
           python -m pip install --upgrade pip
-          python -m pip install --index-url https://test.pypi.org/simple --upgrade xarray
+          python -m pip install --extra-index-url https://test.pypi.org/simple --upgrade xarray
           python -m xarray.util.print_versions
 
   upload-to-pypi: