diff --git a/packages/backend/src/server/api/endpoints/notes/create.test.ts b/packages/backend/src/server/api/endpoints/notes/create.test.ts
index 6086f99c92..0de5a14a93 100644
--- a/packages/backend/src/server/api/endpoints/notes/create.test.ts
+++ b/packages/backend/src/server/api/endpoints/notes/create.test.ts
@@ -72,7 +72,7 @@ describe('api:notes/create', () => {
 					.toBe(INVALID);
 			});
 
-			test('over 100 characters cw', async () => {
+			test('over 500 characters cw', async () => {
 				expect(v({ text: 'Body', cw: await tooLong }))
 					.toBe(INVALID);
 			});
diff --git a/packages/backend/src/server/api/endpoints/notes/create.ts b/packages/backend/src/server/api/endpoints/notes/create.ts
index 49287f4de9..14f67cdfcd 100644
--- a/packages/backend/src/server/api/endpoints/notes/create.ts
+++ b/packages/backend/src/server/api/endpoints/notes/create.ts
@@ -121,7 +121,7 @@ export const paramDef = {
 		visibleUserIds: { type: 'array', uniqueItems: true, items: {
 			type: 'string', format: 'misskey:id',
 		} },
-		cw: { type: 'string', nullable: true, minLength: 1, maxLength: 100 },
+		cw: { type: 'string', nullable: true, minLength: 1, maxLength: 500 },
 		localOnly: { type: 'boolean', default: false },
 		reactionAcceptance: { type: 'string', nullable: true, enum: [null, 'likeOnly', 'likeOnlyForRemote', 'nonSensitiveOnly', 'nonSensitiveOnlyForLocalLikeOnlyForRemote'], default: null },
 		noExtractMentions: { type: 'boolean', default: false },
diff --git a/packages/backend/src/server/api/endpoints/notes/edit.ts b/packages/backend/src/server/api/endpoints/notes/edit.ts
index 49fa4c3bd6..d5592c4726 100644
--- a/packages/backend/src/server/api/endpoints/notes/edit.ts
+++ b/packages/backend/src/server/api/endpoints/notes/edit.ts
@@ -139,7 +139,7 @@ export const paramDef = {
 				format: 'misskey:id',
 			},
 		},
-		cw: { type: 'string', nullable: true, minLength: 1, maxLength: 250 },
+		cw: { type: 'string', nullable: true, minLength: 1, maxLength: 500 },
 		localOnly: { type: 'boolean', default: false },
 		reactionAcceptance: { type: 'string', nullable: true, enum: [null, 'likeOnly', 'likeOnlyForRemote', 'nonSensitiveOnly', 'nonSensitiveOnlyForLocalLikeOnlyForRemote'], default: null },
 		noExtractMentions: { type: 'boolean', default: false },