diff --git a/docs/source/conf.py b/docs/source/conf.py
index 8074a1a97..4fb1261d4 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -45,6 +45,7 @@
     "nbsphinx",
     "sphinx.ext.autodoc",
     "sphinx.ext.autosummary",
+    "sphinx.ext.graphviz",
     "sphinx.ext.intersphinx",
     "sphinx.ext.linkcode",
     "sphinx.ext.napoleon",