diff --git a/packages/backend/src/models/Notification.ts b/packages/backend/src/models/Notification.ts
index df88b99636..87d8c16cb3 100644
--- a/packages/backend/src/models/Notification.ts
+++ b/packages/backend/src/models/Notification.ts
@@ -85,7 +85,7 @@ export type MiNotification = {
 	/**
 	 * アプリ通知のbody
 	 */
-	customBody: string | null;
+	customBody: string;
 
 	/**
 	 * アプリ通知のheader
diff --git a/packages/backend/src/models/json-schema/notification.ts b/packages/backend/src/models/json-schema/notification.ts
index 209bab917a..b05ec8b762 100644
--- a/packages/backend/src/models/json-schema/notification.ts
+++ b/packages/backend/src/models/json-schema/notification.ts
@@ -313,11 +313,11 @@ export const packedNotificationSchema = {
 			},
 			header: {
 				type: 'string',
-				optional: false, nullable: false,
+				optional: false, nullable: true,
 			},
 			icon: {
 				type: 'string',
-				optional: false, nullable: false,
+				optional: false, nullable: true,
 			},
 		},
 	}, {
diff --git a/packages/misskey-js/src/autogen/types.ts b/packages/misskey-js/src/autogen/types.ts
index 032f74653d..37f1bf2d38 100644
--- a/packages/misskey-js/src/autogen/types.ts
+++ b/packages/misskey-js/src/autogen/types.ts
@@ -4254,7 +4254,7 @@ export type components = {
       type: 'achievementEarned';
       /** @enum {string} */
       achievement: 'notes1' | 'notes10' | 'notes100' | 'notes500' | 'notes1000' | 'notes5000' | 'notes10000' | 'notes20000' | 'notes30000' | 'notes40000' | 'notes50000' | 'notes60000' | 'notes70000' | 'notes80000' | 'notes90000' | 'notes100000' | 'login3' | 'login7' | 'login15' | 'login30' | 'login60' | 'login100' | 'login200' | 'login300' | 'login400' | 'login500' | 'login600' | 'login700' | 'login800' | 'login900' | 'login1000' | 'passedSinceAccountCreated1' | 'passedSinceAccountCreated2' | 'passedSinceAccountCreated3' | 'loggedInOnBirthday' | 'loggedInOnNewYearsDay' | 'noteClipped1' | 'noteFavorited1' | 'myNoteFavorited1' | 'profileFilled' | 'markedAsCat' | 'following1' | 'following10' | 'following50' | 'following100' | 'following300' | 'followers1' | 'followers10' | 'followers50' | 'followers100' | 'followers300' | 'followers500' | 'followers1000' | 'collectAchievements30' | 'viewAchievements3min' | 'iLoveMisskey' | 'foundTreasure' | 'client30min' | 'client60min' | 'noteDeletedWithin1min' | 'postedAtLateNight' | 'postedAt0min0sec' | 'selfQuote' | 'htl20npm' | 'viewInstanceChart' | 'outputHelloWorldOnScratchpad' | 'open3windows' | 'driveFolderCircularReference' | 'reactWithoutRead' | 'clickedClickHere' | 'justPlainLucky' | 'setNameToSyuilo' | 'cookieClicked' | 'brainDiver' | 'smashTestNotificationButton' | 'tutorialCompleted' | 'bubbleGameExplodingHead' | 'bubbleGameDoubleExplodingHead';
-    }) | {
+    }) | ({
       /** Format: id */
       id: string;
       /** Format: date-time */
@@ -4262,9 +4262,9 @@ export type components = {
       /** @enum {string} */
       type: 'app';
       body: string;
-      header: string;
-      icon: string;
-    } | {
+      header: string | null;
+      icon: string | null;
+    }) | {
       /** Format: id */
       id: string;
       /** Format: date-time */