diff --git a/packages/backend/src/core/WebhookTestService.ts b/packages/backend/src/core/WebhookTestService.ts
index 0b1e8110e5..0dd3f5c492 100644
--- a/packages/backend/src/core/WebhookTestService.ts
+++ b/packages/backend/src/core/WebhookTestService.ts
@@ -443,6 +443,7 @@ export class WebhookTestService {
 		return {
 			...user,
 			createdAt: this.idService.parse(user.id).date.toISOString(),
+			updatedAt: null,
 			id: user.id,
 			name: user.name,
 			username: user.username,
diff --git a/packages/backend/src/core/entities/UserEntityService.ts b/packages/backend/src/core/entities/UserEntityService.ts
index 638eaac16f..c6e369cafd 100644
--- a/packages/backend/src/core/entities/UserEntityService.ts
+++ b/packages/backend/src/core/entities/UserEntityService.ts
@@ -546,6 +546,7 @@ export class UserEntityService implements OnModuleInit {
 			avatarBlurhash: (user.avatarId == null ? null : user.avatarBlurhash),
 			description: mastoapi ? mastoapi.description : profile ? profile.description : '',
 			createdAt: this.idService.parse(user.id).date.toISOString(),
+			updatedAt: user.updatedAt ? user.updatedAt.toISOString() : null,
 			avatarDecorations: user.avatarDecorations.length > 0 ? this.avatarDecorationService.getAll().then(decorations => user.avatarDecorations.filter(ud => decorations.some(d => d.id === ud.id)).map(ud => ({
 				id: ud.id,
 				angle: ud.angle || undefined,
@@ -601,7 +602,6 @@ export class UserEntityService implements OnModuleInit {
 					? Promise.all(user.alsoKnownAs.map(uri => Promise.resolve(opts.userIdsByUri?.get(uri) ?? this.apPersonService.fetchPerson(uri).then(user => user?.id).catch(() => null))))
 						.then(xs => xs.length === 0 ? null : xs.filter(x => x != null))
 					: null,
-				updatedAt: user.updatedAt ? user.updatedAt.toISOString() : null,
 				lastFetchedAt: user.lastFetchedAt ? user.lastFetchedAt.toISOString() : null,
 				bannerUrl: user.bannerId == null ? null : user.bannerUrl,
 				bannerBlurhash: user.bannerId == null ? null : user.bannerBlurhash,
diff --git a/packages/backend/src/models/json-schema/user.ts b/packages/backend/src/models/json-schema/user.ts
index 23c8086fa6..166406afeb 100644
--- a/packages/backend/src/models/json-schema/user.ts
+++ b/packages/backend/src/models/json-schema/user.ts
@@ -69,6 +69,11 @@ export const packedUserLiteSchema = {
 			nullable: false, optional: false,
 			format: 'date-time',
 		},
+		updatedAt: {
+			type: 'string',
+			nullable: true, optional: false,
+			format: 'date-time',
+		},
 		approved: {
 			type: 'boolean',
 			nullable: false, optional: false,
@@ -304,11 +309,6 @@ export const packedUserDetailedNotMeOnlySchema = {
 				nullable: false, optional: false,
 			},
 		},
-		updatedAt: {
-			type: 'string',
-			nullable: true, optional: false,
-			format: 'date-time',
-		},
 		lastFetchedAt: {
 			type: 'string',
 			nullable: true, optional: false,
diff --git a/packages/misskey-js/src/autogen/types.ts b/packages/misskey-js/src/autogen/types.ts
index 039466ece7..0f44bab03b 100644
--- a/packages/misskey-js/src/autogen/types.ts
+++ b/packages/misskey-js/src/autogen/types.ts
@@ -4254,6 +4254,8 @@ export type components = {
       host: string | null;
       /** Format: date-time */
       createdAt: string;
+      /** Format: date-time */
+      updatedAt: string | null;
       approved: boolean;
       /** @example Hi masters, I am Ai! */
       description: string | null;
@@ -4321,8 +4323,6 @@ export type components = {
       movedTo: string | null;
       alsoKnownAs: string[] | null;
       /** Format: date-time */
-      updatedAt: string | null;
-      /** Format: date-time */
       lastFetchedAt: string | null;
       /** Format: url */
       bannerUrl: string | null;