diff --git a/src/Contrib.KafkaFlow.Outbox.Postgres/schema/0003.Bigserial.sql b/src/Contrib.KafkaFlow.Outbox.Postgres/schema/0003.Bigserial.sql
new file mode 100644
index 0000000..636e50c
--- /dev/null
+++ b/src/Contrib.KafkaFlow.Outbox.Postgres/schema/0003.Bigserial.sql
@@ -0,0 +1 @@
+ALTER TABLE "outbox"."outbox" ALTER COLUMN "sequence_id" TYPE BIGINT;