shphinx version issue?

.github/workflows/gh_pages.yml

@@ -17,7 +17,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           python -m pip install .
-          python -m pip install sphinx
+          python -m pip install "sphinx<7.1"
           python -m pip install sphinx_book_theme
           python -m pip install sphinx-click
       - name: build documentation