diff --git a/backend/src/main/resources/db/migration/V6__school_notnull.sql b/backend/src/main/resources/db/migration/V6__school_notnull.sql
new file mode 100644
index 000000000..51735574f
--- /dev/null
+++ b/backend/src/main/resources/db/migration/V6__school_notnull.sql
@@ -0,0 +1,5 @@
+alter table festival
+    modify school_id bigint not null;
+
+alter table ticket
+    modify school_id bigint not null;