diff --git a/api/src/main/resources/db/migration/V7__add_gallery.sql b/api/src/main/resources/db/migration/V7__add_gallery.sql
index b080ba89..28a5cde7 100644
--- a/api/src/main/resources/db/migration/V7__add_gallery.sql
+++ b/api/src/main/resources/db/migration/V7__add_gallery.sql
@@ -4,6 +4,7 @@ create table if not exists gallery (
     survey_id BIGINT unique not null,
     bookmarked_count INT not null,
     position VARCHAR(255) not null,
+    update_order TIMESTAMP(6) not null,
     created_at TIMESTAMP(6) not null,
     updated_at TIMESTAMP(6) not null
 );
diff --git a/gallery/src/main/kotlin/me/nalab/gallery/domain/Gallery.kt b/gallery/src/main/kotlin/me/nalab/gallery/domain/Gallery.kt
index c34edea8..a61000f5 100644
--- a/gallery/src/main/kotlin/me/nalab/gallery/domain/Gallery.kt
+++ b/gallery/src/main/kotlin/me/nalab/gallery/domain/Gallery.kt
@@ -1,11 +1,8 @@
 package me.nalab.gallery.domain
 
 import me.nalab.core.data.common.TimeBaseEntity
-import javax.persistence.Column
-import javax.persistence.Embedded
-import javax.persistence.Entity
-import javax.persistence.Id
-import javax.persistence.Table
+import java.time.Instant
+import javax.persistence.*
 
 @Entity
 @Table(name = "gallery")
@@ -19,4 +16,7 @@ class Gallery(
 
     @Embedded
     val survey: Survey,
+
+    @Column(name = "update_order", columnDefinition = "TIMESTAMP(6)", nullable = false)
+    private var updateOrder: Instant,
 ) : TimeBaseEntity()