diff --git a/packages/memory-service/src/db/projects.js b/packages/memory-service/src/db/projects.js
index fe477d0..1ddd33c 100644
--- a/packages/memory-service/src/db/projects.js
+++ b/packages/memory-service/src/db/projects.js
@@ -22,7 +22,7 @@ function getProject(id) {
 
 function updateProject(id, fields = {}) {
   const db = getDB();
-  const allowed = ['name', 'description', 'colour', 'icon', 'isolated', 'notes'];
+  const allowed = ['name', 'description', 'colour', 'icon', 'isolated', 'notes', 'system_prompt'];
   const updates = [];
   const values = [];