diff --git a/.github/workflows/doc.yml b/.github/workflows/doc.yml
index a57552b07905f4..36b9f9f1d3497f 100644
--- a/.github/workflows/doc.yml
+++ b/.github/workflows/doc.yml
@@ -37,7 +37,7 @@ jobs:
     - name: 'Install build dependencies'
       run: make -C Doc/ PYTHON=../python venv
     - name: 'Build documentation'
-      run: xvfb-run make -C Doc/ PYTHON=../python SPHINXOPTS="-q -W --keep-going -j4" doctest html suspicious
+      run: xvfb-run make -C Doc/ PYTHON=../python SPHINXOPTS="-q -W --keep-going" doctest html suspicious
     - name: 'Upload'
       uses: actions/upload-artifact@v3
       with:
diff --git a/Doc/Makefile b/Doc/Makefile
index 24528a1c4f3269..939498e548a069 100644
--- a/Doc/Makefile
+++ b/Doc/Makefile
@@ -17,7 +17,7 @@ SPHINXERRORHANDLING = -W
 PAPEROPT_a4     = -D latex_elements.papersize=a4paper
 PAPEROPT_letter = -D latex_elements.papersize=letterpaper
 
-ALLSPHINXOPTS = -b $(BUILDER) -d build/doctrees $(PAPEROPT_$(PAPER)) \
+ALLSPHINXOPTS = -b $(BUILDER) -d build/doctrees $(PAPEROPT_$(PAPER)) -j auto \
                 $(SPHINXOPTS) $(SPHINXERRORHANDLING) . build/$(BUILDER) $(SOURCES)
 
 .PHONY: help build html htmlhelp latex text texinfo changes linkcheck \