diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 9de28c085db..6dff9919ad1 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -327,7 +327,7 @@ jobs:
         run: |
           python3 -m pip install ruamel.yaml scons numpy cython sphinx==5.1.1 \
           sphinxcontrib-matlabdomain sphinxcontrib-doxylink pint \
-          pydata-sphinx-theme==0.13.3
+          pydata-sphinx-theme==0.13.3 sphinx-argparse
       - name: Build Cantera with documentation
         run: python3 `which scons` build -j2 doxygen_docs=y sphinx_docs=y debug=n optimize=n use_pch=n
       - name: Ensure 'scons help' options work