diff --git a/requirements.txt b/requirements.txt
index 1dbf927199..13d828674a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,4 @@ Sphinx==7.2.6
 sphinx-rtd-theme==2.0.0
 readthedocs-sphinx-ext==2.2.5
 Jinja2==3.1.5
+sphinx-notfound-page==1.1.0
diff --git a/source/conf.py b/source/conf.py
index 83aa8f291e..3c529caa67 100644
--- a/source/conf.py
+++ b/source/conf.py
@@ -46,6 +46,7 @@
     'sphinx.ext.intersphinx',
     'sphinx.ext.todo',
     'sphinx.ext.autosectionlabel',
+    'notfound.extension',
 ]
 
 # Add any paths that contain templates here, relative to this directory.