diff --git a/.github/workflows/doc_build.yml b/.github/workflows/doc_build.yml
index 76c13baf..05e4f4d0 100644
--- a/.github/workflows/doc_build.yml
+++ b/.github/workflows/doc_build.yml
@@ -65,6 +65,12 @@ jobs:
     container: ghcr.io/osgeo/proj-docs
 
     steps:
+    - name: Pin sphinx version
+      # Avoid https://github.com/sphinx-doc/sphinx/issues/11163
+      shell: bash -l {0}
+      run: |
+          python3 -m pip install --user "sphinx==6.0.1"
+
     - uses: actions/checkout@v3
     - name: Print versions
       shell: bash -l {0}
diff --git a/docs/source/conf.py b/docs/source/conf.py
index 68b2f489..acd626ec 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -35,6 +35,7 @@ import bibstyle
 extensions = [
     'sphinx.ext.mathjax',
     'sphinxcontrib.bibtex',
+    "sphinxcontrib.jquery",
     'sphinxcontrib.spelling',
     'breathe',
     'redirects',