diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 5212a1e9..1f2fc73c 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -52,7 +52,7 @@ jobs:
     - name: Install dependencies with Sphinx ${{ matrix.sphinx }}
       run: |
         pip install --upgrade pip
-        pip install --upgrade "sphinx${{matrix.sphinx}}" -e .[test]
+        pip install --upgrade "sphinx${{matrix.sphinx}}" -e .[test] --pre
 
     - name: Run pytest
       run: >