diff --git a/sphinx/g3proxy/conf.py b/sphinx/g3proxy/conf.py
index 24ee6e4f..3a482235 100644
--- a/sphinx/g3proxy/conf.py
+++ b/sphinx/g3proxy/conf.py
@@ -14,9 +14,7 @@
 # -- General configuration ---------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#general-configuration
 
-extensions = [
-    "sphinx.ext.graphviz",
-]
+extensions = []
 
 templates_path = ['_templates']
 exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
@@ -33,6 +31,3 @@
 # The default changed from 'contents' to 'index' from sphinx version 2.0,
 # so we need to explicitly set it in order to be compatible with old versions.
 master_doc = 'index'
-
-# Use 'svg' format for graphviz
-graphviz_output_format = 'svg'
diff --git a/sphinx/g3tiles/conf.py b/sphinx/g3tiles/conf.py
index b1529106..ea280568 100644
--- a/sphinx/g3tiles/conf.py
+++ b/sphinx/g3tiles/conf.py
@@ -19,14 +19,12 @@
 templates_path = ['_templates']
 exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
 
-
 # -- Options for HTML output -------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#options-for-html-output
 
 html_theme = "sphinx_rtd_theme"
 html_static_path = ['_static']
 
-
 # -- Custom Options ----------------------------------------------------------
 
 # Set the master document, which contains the root toctree directive.