diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 0ad1fd8f5..a3647094d 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -132,10 +132,10 @@ jobs:
               # doctest docstrings
               pytest --doctest-modules --pyargs pywt -v  --doctest-collect=api
               # Run Sphinx HTML docs builder, converting warnings to errors
+              # Move back out of demo/ to root directory
               cd ..
-            # XXX sphinx build is broken on CI
-           #   pip install -r util/readthedocs/requirements.txt
-            #  sphinx-build -b html -W --keep-going -d _build/doctrees . doc/source doc/build
+              pip install -r util/readthedocs/requirements.txt
+              sphinx-build -b html -W --keep-going -d _build/doctrees doc/source doc/build
           else
               pytest --pyargs pywt
           fi