fix

.github/workflows/ci.yaml

@@ -35,7 +35,7 @@ jobs:
           cache: pip
           cache-dependency-path: docs-requirements.txt
       - name: Install dependencies
-        run: pip install -r docs-requirements.txt
+        run: pip install --require-hashes -r docs-requirements.txt
       - name: Build docs
         run: sphinx-build -W -b html docs docs/_build