diff --git a/matplotlib.org.yml b/matplotlib.org.yml
index c2b28b5..f552907 100644
--- a/matplotlib.org.yml
+++ b/matplotlib.org.yml
@@ -17,7 +17,6 @@
       - governance
       - ipympl
       - matplotblog
-      - mpl-altair
       - mpl-bench
       - mpl-gui
       - mpl-sphinx-theme
diff --git a/templates/Caddyfile.j2 b/templates/Caddyfile.j2
index d8b4b61..ef2f5c8 100644
--- a/templates/Caddyfile.j2
+++ b/templates/Caddyfile.j2
@@ -74,6 +74,10 @@ http://{{ caddy.addresses.main }}, http://{{ ansible_fqdn }} {
 	import subproject {{ site }}
 {% endfor %}
 
+	# Hide mpl-altair until the site is fixed.
+	redir /mpl-altair https://github.com/matplotlib/mpl-altair temporary
+	redir /mpl-altair/* https://github.com/matplotlib/mpl-altair temporary
+
 	# redirect the objects.inv
 	redir /objects.inv /stable/objects.inv permanent