diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2c428cf..9d6aaad 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,6 +25,10 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
 
+      - name: setup graphviz
+        if: matrix.toxenv == 'docs'
+        uses: ts-graphviz/setup-graphviz@v1
+
       - name: Install pip
         run: pip install -r requirements/pip.txt