diff --git a/.github/workflows/ci_workflows.yml b/.github/workflows/ci_workflows.yml
index fc67e80..21fe9fb 100644
--- a/.github/workflows/ci_workflows.yml
+++ b/.github/workflows/ci_workflows.yml
@@ -102,6 +102,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip setuptools
         python -m pip install --extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple numpy>=0.0.dev0 --pre --upgrade
+        python -m pip install --extra-index-url https://pypi.anaconda.org/liberfa/simple pyerfa>=0.0.dev0 --pre --upgrade
         python -m pip install --extra-index-url https://pypi.anaconda.org/astropy/simple astropy>=0.0.dev0 --pre --upgrade
         python -m pip install -e .[test]
     - name: Test with dev deps