diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 077399bb8b..a04cd49a50 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -44,6 +44,8 @@ jobs:
           conda config --show-sources
           conda config --show
           printenv | sort
+      - name: Setup Graphviz
+        uses: ts-graphviz/setup-graphviz@v1
       - name: Build the documentation
         shell: bash -el {0}
         run: make docs