diff --git a/backend/src/lib/newbook.js b/backend/src/lib/newbook.js
index 0469d7e..7f7cb06 100644
--- a/backend/src/lib/newbook.js
+++ b/backend/src/lib/newbook.js
@@ -75,6 +75,7 @@ export async function fetchTasks(fromDate, toDate) {
     period_from:     `${fromDate} 00:00:00`,
     period_to:       `${toDate} 23:59:59`,
     show_uncomplete: 'true',
+    task_type:       [-1],  // -1 = all types; required by the API
   })
   return res?.data ?? []
 }