diff --git a/backend/scripts/sync_all_zones.py b/backend/scripts/sync_all_zones.py
index e27e571..65b49c4 100644
--- a/backend/scripts/sync_all_zones.py
+++ b/backend/scripts/sync_all_zones.py
@@ -45,7 +45,7 @@ COMPRESS_DOMAIN_LISTS = True
 
 # CZDS TLDs we have access to
 # Note: .org is HUGE (~10M domains, 442MB gz) - requires special handling
-CZDS_TLDS = ["app", "dev", "info", "online", "xyz"]  # org temporarily excluded due to memory
+CZDS_TLDS = ["app", "biz", "club", "dev", "info", "online", "xyz"]  # org temporarily excluded due to memory
 CZDS_TLDS_LARGE = ["org"]  # Process separately with streaming
 
 # Switch.ch AXFR config