diff --git a/backend/src/main/java/com/festago/festival/domain/Festival.java b/backend/src/main/java/com/festago/festival/domain/Festival.java
index 4d2a013d2..64602cc87 100644
--- a/backend/src/main/java/com/festago/festival/domain/Festival.java
+++ b/backend/src/main/java/com/festago/festival/domain/Festival.java
@@ -39,7 +39,6 @@ public class Festival extends BaseTimeEntity {
     @Size(max = 255)
     private String thumbnail;
 
-    @NotNull
     @ManyToOne(fetch = FetchType.LAZY)
     private School school;
 
diff --git a/backend/src/main/java/com/festago/ticket/domain/Ticket.java b/backend/src/main/java/com/festago/ticket/domain/Ticket.java
index 67f1604cf..fe873d0ff 100644
--- a/backend/src/main/java/com/festago/ticket/domain/Ticket.java
+++ b/backend/src/main/java/com/festago/ticket/domain/Ticket.java
@@ -39,7 +39,6 @@ public class Ticket extends BaseTimeEntity {
     @ManyToOne(fetch = FetchType.LAZY)
     private Stage stage;
 
-    @NotNull
     private Long schoolId;
 
     @NotNull
diff --git a/backend/src/main/resources/db/migration/V4__add_school_fk.sql b/backend/src/main/resources/db/migration/V4__add_school_fk.sql
index 42a816f19..bcdb2f62a 100644
--- a/backend/src/main/resources/db/migration/V4__add_school_fk.sql
+++ b/backend/src/main/resources/db/migration/V4__add_school_fk.sql
@@ -1,5 +1,5 @@
 alter table ticket
-    add column school_id bigint not null;
+    add column school_id bigint;
 
 alter table ticket
     add constraint fk_ticket__school
@@ -7,7 +7,7 @@ alter table ticket
             references school (id);
 
 alter table festival
-    add column school_id bigint not null;
+    add column school_id bigint;
 
 alter table festival
     add constraint fk_festival__school