diff --git a/.github/workflows/ci-build.yml b/.github/workflows/ci-build.yml
index 5104fc1b..12c8b348 100644
--- a/.github/workflows/ci-build.yml
+++ b/.github/workflows/ci-build.yml
@@ -237,6 +237,9 @@ jobs:
         run: |
           python -m pip install --upgrade -r requirements.txt
 
+      - name: Setup Graphviz
+        uses: ts-graphviz/setup-graphviz@v2
+
       - name: Build documentation
         run: |
           python build.py setrev dox etg sip build_wx build_py wxlib sphinx bdist_docs docset_py