diff --git a/peps/conf.py b/peps/conf.py
index 824545e193a..0bad14e819f 100644
--- a/peps/conf.py
+++ b/peps/conf.py
@@ -24,7 +24,6 @@
     "sphinx.ext.extlinks",
     "sphinx.ext.intersphinx",
     "sphinx.ext.githubpages",
-    "sphinxcontrib.mermaid",
 ]
 
 # The file extensions of source files. Sphinx uses these suffixes as sources.
diff --git a/requirements.txt b/requirements.txt
index fc2a5c85f68..ffcbe1a8aa6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,6 @@ Pygments >= 2.9.0
 Sphinx >= 5.1.1, != 6.1.0, != 6.1.1, < 8.1.0
 docutils >= 0.19.0
 sphinx-notfound-page >= 1.0.2
-sphinxcontrib-mermaid
 
 # For tests
 pytest