diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 2708082..2dec525 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -70,8 +70,8 @@ jobs:
       if: ${{ contains( matrix.python-version, 'dev' ) }}
       run: |
         python -m pip install --pre --upgrade pip setuptools wheel build
-        python -m pip install --pre --no-binary curio --upgrade -e .[${{ matrix.deps }}]
-        python -m pip install --pre --upgrade check-manifest pytest-cov  pytest-json-report
+        python -m pip install --pre --extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple --no-binary curio --upgrade -e .[${{ matrix.deps }}]
+        python -m pip install --pre --extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple --upgrade check-manifest pytest-cov  pytest-json-report
     - name: Try building with Python build
       if: runner.os != 'Windows'  # setup.py does not support sdist on Windows
       run: |