diff --git a/apps/resm/tasks.py b/apps/resm/tasks.py
index 172b76d..1507f80 100644
--- a/apps/resm/tasks.py
+++ b/apps/resm/tasks.py
@@ -257,7 +257,7 @@ def get_pdf_from_elsevier(number_of_task=100):
     return f'{def_name}, {err_msg}, remaining {qs_count} papers'
 
 RUNNING_KEY = "download_pdf:running"
-MAX_RUNNING = 20
+MAX_RUNNING = 50
 
 def can_send_more():
     return cache.get(RUNNING_KEY, 0) < MAX_RUNNING