diff --git a/upgrade/sql/9.3.0.sql b/upgrade/sql/9.3.0.sql
new file mode 100644
index 000000000..c0286cbcd
--- /dev/null
+++ b/upgrade/sql/9.3.0.sql
@@ -0,0 +1,6 @@
+SET SESSION sql_mode='';
+SET NAMES 'utf8mb4';
+
+-- https://github.com/PrestaShop/PrestaShop/pull/42438
+-- Drop the index duplicating the leftmost prefix of the primary key on cart_rule_combination
+ALTER TABLE `PREFIX_cart_rule_combination` DROP INDEX `id_cart_rule_1`;