diff --git a/frontend/src/components/ui-new/hooks/useWorkspaces.ts b/frontend/src/components/ui-new/hooks/useWorkspaces.ts
index ae9673a1..0d7fa599 100644
--- a/frontend/src/components/ui-new/hooks/useWorkspaces.ts
+++ b/frontend/src/components/ui-new/hooks/useWorkspaces.ts
@@ -179,9 +179,9 @@ export function useWorkspaces(): UseWorkspacesResult {
         if (a.pinned !== b.pinned) {
           return a.pinned ? -1 : 1;
         }
-        // Then by created_at (newest first)
+        // Then by updated_at (most recent first)
         return (
-          new Date(b.created_at).getTime() - new Date(a.created_at).getTime()
+          new Date(b.updated_at).getTime() - new Date(a.updated_at).getTime()
         );
       })
       .map((ws) => toSidebarWorkspace(ws, activeSummaries.get(ws.id)));
@@ -195,9 +195,9 @@ export function useWorkspaces(): UseWorkspacesResult {
         if (a.pinned !== b.pinned) {
           return a.pinned ? -1 : 1;
         }
-        // Then by created_at (newest first)
+        // Then by updated_at (most recent first)
         return (
-          new Date(b.created_at).getTime() - new Date(a.created_at).getTime()
+          new Date(b.updated_at).getTime() - new Date(a.updated_at).getTime()
         );
       })
       .map((ws) => toSidebarWorkspace(ws, archivedSummaries.get(ws.id)));