diff --git a/plinth/modules/upgrades/privileged.py b/plinth/modules/upgrades/privileged.py
index 17c044603..1573b3006 100644
--- a/plinth/modules/upgrades/privileged.py
+++ b/plinth/modules/upgrades/privileged.py
@@ -379,16 +379,12 @@ def _check_dist_upgrade(test_upgrade=False) -> Tuple[bool, str]:
 
     with open(SOURCES_LIST, 'w', encoding='utf-8') as sources_list:
         for line in lines:
-            # E.g. replace 'buster' with 'bullseye'.
+            # E.g. replace 'bullseye' with 'bookworm'.
             new_line = line.replace(dist, codename)
             if check_dist == 'testing':
-                # E.g. replace 'stable' with 'bullseye'.
+                # E.g. replace 'stable' with 'bookworm'.
                 new_line = new_line.replace('stable', codename)
 
-            # Security suite name renamed starting with bullseye
-            if 'security' in new_line:
-                new_line = new_line.replace('/updates', '-security')
-
             sources_list.write(new_line)
 
     logging.info('Dist upgrade in progress. Setting flag.')