diff --git a/openupgrade_scripts/scripts/website/16.0.1.0/pre-migration.py b/openupgrade_scripts/scripts/website/16.0.1.0/pre-migration.py
index adbb47648c1c..6b8a03f6b6d3 100644
--- a/openupgrade_scripts/scripts/website/16.0.1.0/pre-migration.py
+++ b/openupgrade_scripts/scripts/website/16.0.1.0/pre-migration.py
@@ -1,4 +1,7 @@
+from itertools import chain
+
 from openupgradelib import openupgrade
+from openupgradelib.openupgrade_160 import convert_string_bootstrap_4to5
 
 _xmlids_renames = [
     (
@@ -70,6 +73,22 @@ def keep_the_first_domain_when_duplicate(env):
     )
 
 
+def boostrap_5_migration(env):
+    """Convert customized website views to Bootstrap 5."""
+     # Find views to convert
+    env.cr.execute(
+        """
+        SELECT iuv.id FROM ir_ui_view iuv JOIN website w on w.id = iuv.website_id
+        WHERE iuv.inherit_id IS NULL AND iuv.type = 'qweb' AND iuv.website_id IS NOT NULL
+    """
+    )
+    view_ids = list(chain.from_iterable(env.cr.fetchall()))
+    all_view_need_bs5_migration = env["ir.ui.view"].browse(view_ids)
+    for view in all_view_need_bs5_migration:
+        new_arch = convert_string_bootstrap_4to5(view.arch_db)
+        view.arch_db = new_arch
+
+
 @openupgrade.migrate()
 def migrate(env, version):
     _fill_partner_id_if_null(env)
@@ -78,3 +97,4 @@ def migrate(env, version):
     openupgrade.delete_records_safely_by_xml_id(env, _xmlids_delete)
     delete_constraint_website_visitor_partner_uniq(env)
     keep_the_first_domain_when_duplicate(env)
+    boostrap_5_migration(env)