diff --git a/packages/backend/src/server/api/endpoints/channels/timeline.ts b/packages/backend/src/server/api/endpoints/channels/timeline.ts
index 56b8fc5c3..f0b14d4fd 100644
--- a/packages/backend/src/server/api/endpoints/channels/timeline.ts
+++ b/packages/backend/src/server/api/endpoints/channels/timeline.ts
@@ -79,14 +79,14 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 
 			let timeline: MiNote[] = [];
 
-			const limit = ps.limit + (ps.untilId ? 1 : 0); // untilIdに指定したものも含まれるため+1
+			const limit = ps.limit + (ps.untilId ? 1 : 0) + (ps.sinceId ? 1 : 0); // untilIdに指定したものも含まれるため+1
 			let noteIdsRes: [string, string[]][] = [];
 
 			if (!ps.sinceId && !ps.sinceDate) {
 				noteIdsRes = await this.redisForTimelines.xrevrange(
 					`channelTimeline:${channel.id}`,
 					ps.untilId ? this.idService.parse(ps.untilId).date.getTime() : ps.untilDate ?? '+',
-					'-',
+					ps.sinceId ? this.idService.parse(ps.sinceId).date.getTime() : ps.sinceDate ?? '-',
 					'COUNT', limit);
 			}
 
@@ -110,7 +110,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 
 				timeline = await query.limit(ps.limit).getMany();
 			} else {
-				const noteIds = noteIdsRes.map(x => x[1][1]).filter(x => x !== ps.untilId);
+				const noteIds = noteIdsRes.map(x => x[1][1]).filter(x => x !== ps.untilId && x !== ps.sinceId);
 
 				if (noteIds.length === 0) {
 					return [];
diff --git a/packages/backend/src/server/api/endpoints/notes/hybrid-timeline.ts b/packages/backend/src/server/api/endpoints/notes/hybrid-timeline.ts
index cae749bb8..8e7f2a2a9 100644
--- a/packages/backend/src/server/api/endpoints/notes/hybrid-timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/hybrid-timeline.ts
@@ -91,7 +91,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 
 			let timeline: MiNote[] = [];
 
-			const limit = ps.limit + (ps.untilId ? 1 : 0); // untilIdに指定したものも含まれるため+1
+			const limit = ps.limit + (ps.untilId ? 1 : 0) + (ps.sinceId ? 1 : 0); // untilIdに指定したものも含まれるため+1
 			let htlNoteIdsRes: [string, string[]][] = [];
 			let ltlNoteIdsRes: [string, string[]][] = [];
 
@@ -100,18 +100,18 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 					this.redisForTimelines.xrevrange(
 						ps.withFiles ? `homeTimelineWithFiles:${me.id}` : `homeTimeline:${me.id}`,
 						ps.untilId ? this.idService.parse(ps.untilId).date.getTime() : ps.untilDate ?? '+',
-						'-',
+						ps.sinceId ? this.idService.parse(ps.sinceId).date.getTime() : ps.sinceDate ?? '-',
 						'COUNT', limit),
 					this.redisForTimelines.xrevrange(
 						ps.withFiles ? 'localTimelineWithFiles' : 'localTimeline',
 						ps.untilId ? this.idService.parse(ps.untilId).date.getTime() : ps.untilDate ?? '+',
-						'-',
+						ps.sinceId ? this.idService.parse(ps.sinceId).date.getTime() : ps.sinceDate ?? '-',
 						'COUNT', limit),
 				]);
 			}
 
-			const htlNoteIds = htlNoteIdsRes.map(x => x[1][1]).filter(x => x !== ps.untilId);
-			const ltlNoteIds = ltlNoteIdsRes.map(x => x[1][1]).filter(x => x !== ps.untilId);
+			const htlNoteIds = htlNoteIdsRes.map(x => x[1][1]).filter(x => x !== ps.untilId && x !== ps.sinceId);
+			const ltlNoteIds = ltlNoteIdsRes.map(x => x[1][1]).filter(x => x !== ps.untilId && x !== ps.sinceId);
 			let noteIds = Array.from(new Set([...htlNoteIds, ...ltlNoteIds]));
 			noteIds.sort((a, b) => a > b ? -1 : 1);
 			noteIds = noteIds.slice(0, ps.limit);
diff --git a/packages/backend/src/server/api/endpoints/notes/local-timeline.ts b/packages/backend/src/server/api/endpoints/notes/local-timeline.ts
index ed57ca1a3..ac8f8d610 100644
--- a/packages/backend/src/server/api/endpoints/notes/local-timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/local-timeline.ts
@@ -87,18 +87,18 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 
 			let timeline: MiNote[] = [];
 
-			const limit = ps.limit + (ps.untilId ? 1 : 0); // untilIdに指定したものも含まれるため+1
+			const limit = ps.limit + (ps.untilId ? 1 : 0) + (ps.sinceId ? 1 : 0); // untilIdに指定したものも含まれるため+1
 			let noteIdsRes: [string, string[]][] = [];
 
 			if (!ps.sinceId && !ps.sinceDate) {
 				noteIdsRes = await this.redisForTimelines.xrevrange(
 					ps.withFiles ? 'localTimelineWithFiles' : 'localTimeline',
 					ps.untilId ? this.idService.parse(ps.untilId).date.getTime() : ps.untilDate ?? '+',
-					'-',
+					ps.sinceId ? this.idService.parse(ps.sinceId).date.getTime() : ps.sinceDate ?? '-',
 					'COUNT', limit);
 			}
 
-			const noteIds = noteIdsRes.map(x => x[1][1]).filter(x => x !== ps.untilId);
+			const noteIds = noteIdsRes.map(x => x[1][1]).filter(x => x !== ps.untilId && x !== ps.sinceId);
 
 			if (noteIds.length === 0) {
 				return [];
diff --git a/packages/backend/src/server/api/endpoints/notes/timeline.ts b/packages/backend/src/server/api/endpoints/notes/timeline.ts
index 2f25d2d7c..744235697 100644
--- a/packages/backend/src/server/api/endpoints/notes/timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/timeline.ts
@@ -78,18 +78,18 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 
 			let timeline: MiNote[] = [];
 
-			const limit = ps.limit + (ps.untilId ? 1 : 0); // untilIdに指定したものも含まれるため+1
+			const limit = ps.limit + (ps.untilId ? 1 : 0) + (ps.sinceId ? 1 : 0); // untilIdに指定したものも含まれるため+1
 			let noteIdsRes: [string, string[]][] = [];
 
 			if (!ps.sinceId && !ps.sinceDate) {
 				noteIdsRes = await this.redisForTimelines.xrevrange(
 					ps.withFiles ? `homeTimelineWithFiles:${me.id}` : `homeTimeline:${me.id}`,
 					ps.untilId ? this.idService.parse(ps.untilId).date.getTime() : ps.untilDate ?? '+',
-					'-',
+					ps.sinceId ? this.idService.parse(ps.sinceId).date.getTime() : ps.sinceDate ?? '-',
 					'COUNT', limit);
 			}
 
-			const noteIds = noteIdsRes.map(x => x[1][1]).filter(x => x !== ps.untilId);
+			const noteIds = noteIdsRes.map(x => x[1][1]).filter(x => x !== ps.untilId && x !== ps.sinceId);
 
 			if (noteIds.length === 0) {
 				return [];
diff --git a/packages/backend/src/server/api/endpoints/notes/user-list-timeline.ts b/packages/backend/src/server/api/endpoints/notes/user-list-timeline.ts
index ae2401c4c..d11e9751b 100644
--- a/packages/backend/src/server/api/endpoints/notes/user-list-timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/user-list-timeline.ts
@@ -102,18 +102,18 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 
 			let timeline: MiNote[] = [];
 
-			const limit = ps.limit + (ps.untilId ? 1 : 0); // untilIdに指定したものも含まれるため+1
+			const limit = ps.limit + (ps.untilId ? 1 : 0) + (ps.sinceId ? 1 : 0); // untilIdに指定したものも含まれるため+1
 			let noteIdsRes: [string, string[]][] = [];
 
 			if (!ps.sinceId && !ps.sinceDate) {
 				noteIdsRes = await this.redisForTimelines.xrevrange(
 					ps.withFiles ? `userListTimelineWithFiles:${list.id}` : `userListTimeline:${list.id}`,
 					ps.untilId ? this.idService.parse(ps.untilId).date.getTime() : ps.untilDate ?? '+',
-					'-',
+					ps.sinceId ? this.idService.parse(ps.sinceId).date.getTime() : ps.sinceDate ?? '-',
 					'COUNT', limit);
 			}
 
-			const noteIds = noteIdsRes.map(x => x[1][1]).filter(x => x !== ps.untilId);
+			const noteIds = noteIdsRes.map(x => x[1][1]).filter(x => x !== ps.untilId && x !== ps.sinceId);
 
 			if (noteIds.length === 0) {
 				return [];
diff --git a/packages/backend/src/server/api/endpoints/users/notes.ts b/packages/backend/src/server/api/endpoints/users/notes.ts
index 4374863f2..23c2811fb 100644
--- a/packages/backend/src/server/api/endpoints/users/notes.ts
+++ b/packages/backend/src/server/api/endpoints/users/notes.ts
@@ -80,7 +80,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 
 			let timeline: MiNote[] = [];
 
-			const limit = ps.limit + (ps.untilId ? 1 : 0); // untilIdに指定したものも含まれるため+1
+			const limit = ps.limit + (ps.untilId ? 1 : 0) + (ps.sinceId ? 1 : 0); // untilIdに指定したものも含まれるため+1
 			let noteIdsRes: [string, string[]][] = [];
 			let repliesNoteIdsRes: [string, string[]][] = [];
 			let channelNoteIdsRes: [string, string[]][] = [];
@@ -90,29 +90,29 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 					this.redisForTimelines.xrevrange(
 						ps.withFiles ? `userTimelineWithFiles:${ps.userId}` : `userTimeline:${ps.userId}`,
 						ps.untilId ? this.idService.parse(ps.untilId).date.getTime() : ps.untilDate ?? '+',
-						'-',
+						ps.sinceId ? this.idService.parse(ps.sinceId).date.getTime() : ps.sinceDate ?? '-',
 						'COUNT', limit),
 					ps.withReplies
 						? this.redisForTimelines.xrevrange(
 							`userTimelineWithReplies:${ps.userId}`,
 							ps.untilId ? this.idService.parse(ps.untilId).date.getTime() : ps.untilDate ?? '+',
-							'-',
+							ps.sinceId ? this.idService.parse(ps.sinceId).date.getTime() : ps.sinceDate ?? '-',
 							'COUNT', limit)
 						: Promise.resolve([]),
 					ps.withChannelNotes
 						? this.redisForTimelines.xrevrange(
 							`userTimelineWithChannel:${ps.userId}`,
 							ps.untilId ? this.idService.parse(ps.untilId).date.getTime() : ps.untilDate ?? '+',
-							'-',
+							ps.sinceId ? this.idService.parse(ps.sinceId).date.getTime() : ps.sinceDate ?? '-',
 							'COUNT', limit)
 						: Promise.resolve([]),
 				]);
 			}
 
 			let noteIds = Array.from(new Set([
-				...noteIdsRes.map(x => x[1][1]).filter(x => x !== ps.untilId),
-				...repliesNoteIdsRes.map(x => x[1][1]).filter(x => x !== ps.untilId),
-				...channelNoteIdsRes.map(x => x[1][1]).filter(x => x !== ps.untilId),
+				...noteIdsRes.map(x => x[1][1]).filter(x => x !== ps.untilId && x !== ps.sinceId),
+				...repliesNoteIdsRes.map(x => x[1][1]).filter(x => x !== ps.untilId && x !== ps.sinceId),
+				...channelNoteIdsRes.map(x => x[1][1]).filter(x => x !== ps.untilId && x !== ps.sinceId),
 			]));
 			noteIds.sort((a, b) => a > b ? -1 : 1);
 			noteIds = noteIds.slice(0, ps.limit);