diff --git a/site/conf.py b/site/conf.py
index cd91edb5..4024b59b 100644
--- a/site/conf.py
+++ b/site/conf.py
@@ -42,7 +42,7 @@
                     ]
 
 # MyST-NB configuration
-execution_timeout = 900
+nb_execution_timeout = 900
 
 
 # -- Options for HTML output -------------------------------------------------