diff --git a/src/lib/server/db/media.ts b/src/lib/server/db/media.ts
index 1f1e065..fbd8976 100644
--- a/src/lib/server/db/media.ts
+++ b/src/lib/server/db/media.ts
@@ -5,7 +5,7 @@ import db from "./kysely";
 interface Thumbnail {
   id: number;
   path: string;
-  createdAt: Date;
+  updatedAt: Date;
   encContentIv: string;
 }
 
@@ -49,13 +49,13 @@ export const updateFileThumbnail = async (
       .values({
         file_id: fileId,
         path,
-        created_at: now,
+        updated_at: now,
         encrypted_content_iv: encContentIv,
       })
       .onConflict((oc) =>
         oc.column("file_id").doUpdateSet({
           path,
-          created_at: now,
+          updated_at: now,
           encrypted_content_iv: encContentIv,
         }),
       )
@@ -80,7 +80,7 @@ export const getFileThumbnail = async (userId: number, fileId: number) => {
         fileId: thumbnail.file_id,
         path: thumbnail.path,
         encContentIv: thumbnail.encrypted_content_iv,
-        createdAt: thumbnail.created_at,
+        updatedAt: thumbnail.updated_at,
       } satisfies FileThumbnail)
     : null;
 };
diff --git a/src/lib/server/db/migrations/1738409340-AddThumbnail.ts b/src/lib/server/db/migrations/1738409340-AddThumbnail.ts
index 0e38647..c3ce806 100644
--- a/src/lib/server/db/migrations/1738409340-AddThumbnail.ts
+++ b/src/lib/server/db/migrations/1738409340-AddThumbnail.ts
@@ -16,7 +16,7 @@ export const up = async (db: Kysely<any>) => {
       col.references("category.id").onDelete("cascade").unique(),
     )
     .addColumn("path", "text", (col) => col.unique().notNull())
-    .addColumn("created_at", "timestamp(3)", (col) => col.notNull())
+    .addColumn("updated_at", "timestamp(3)", (col) => col.notNull())
     .addColumn("encrypted_content_iv", "text", (col) => col.notNull())
     .addCheckConstraint(
       "thumbnail_ck01",
diff --git a/src/lib/server/db/schema/media.ts b/src/lib/server/db/schema/media.ts
index ad593b4..ebfbf29 100644
--- a/src/lib/server/db/schema/media.ts
+++ b/src/lib/server/db/schema/media.ts
@@ -6,7 +6,7 @@ interface ThumbnailTable {
   file_id: number | null;
   category_id: number | null;
   path: string;
-  created_at: Date;
+  updated_at: Date;
   encrypted_content_iv: string; // Base64
 }
 
diff --git a/src/lib/server/schemas/file.ts b/src/lib/server/schemas/file.ts
index 4cf140f..1d7ccb5 100644
--- a/src/lib/server/schemas/file.ts
+++ b/src/lib/server/schemas/file.ts
@@ -31,6 +31,7 @@ export const fileRenameRequest = z.object({
 export type FileRenameRequest = z.infer<typeof fileRenameRequest>;
 
 export const fileThumbnailInfoResponse = z.object({
+  updatedAt: z.string().datetime(),
   encContentIv: z.string().base64().nonempty(),
 });
 export type FileThumbnailInfoResponse = z.infer<typeof fileThumbnailInfoResponse>;
diff --git a/src/lib/server/services/file.ts b/src/lib/server/services/file.ts
index 83e5750..7616739 100644
--- a/src/lib/server/services/file.ts
+++ b/src/lib/server/services/file.ts
@@ -92,7 +92,7 @@ export const getFileThumbnailInformation = async (userId: number, fileId: number
     error(404, "File or its thumbnail not found");
   }
 
-  return { encContentIv: thumbnail.encContentIv };
+  return { updatedAt: thumbnail.updatedAt, encContentIv: thumbnail.encContentIv };
 };
 
 export const getFileThumbnailStream = async (userId: number, fileId: number) => {
diff --git a/src/routes/api/file/[id]/thumbnail/+server.ts b/src/routes/api/file/[id]/thumbnail/+server.ts
index ab9d48c..7bc81ca 100644
--- a/src/routes/api/file/[id]/thumbnail/+server.ts
+++ b/src/routes/api/file/[id]/thumbnail/+server.ts
@@ -16,8 +16,11 @@ export const GET: RequestHandler = async ({ locals, params }) => {
   if (!zodRes.success) error(400, "Invalid path parameters");
   const { id } = zodRes.data;
 
-  const { encContentIv } = await getFileThumbnailInformation(userId, id);
+  const { updatedAt, encContentIv } = await getFileThumbnailInformation(userId, id);
   return json(
-    fileThumbnailInfoResponse.parse({ encContentIv } satisfies FileThumbnailInfoResponse),
+    fileThumbnailInfoResponse.parse({
+      updatedAt: updatedAt.toISOString(),
+      encContentIv,
+    } satisfies FileThumbnailInfoResponse),
   );
 };