diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9f54948619..9da5e9bb2e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -69,6 +69,7 @@
 - Fix: ActivityPubリクエストURLチェック実装は仕様に従っていないのを修正
 - Fix: 連合無しモードでも外部から照会可能だった問題を修正
 - Fix: テスト用WebHookのペイロードの`emojis`パラメータが実際のものと異なる問題を修正
+- Fix: 非ログインでタイムラインのストリームに接続した際、表示にログイン必須のノートが流れる場合がある問題を修正
 
 ## 2025.3.1
 
diff --git a/packages/backend/src/server/api/stream/channels/global-timeline.ts b/packages/backend/src/server/api/stream/channels/global-timeline.ts
index ed56fe0d40..4f64ce6866 100644
--- a/packages/backend/src/server/api/stream/channels/global-timeline.ts
+++ b/packages/backend/src/server/api/stream/channels/global-timeline.ts
@@ -50,6 +50,7 @@ class GlobalTimelineChannel extends Channel {
 
 		if (note.visibility !== 'public') return;
 		if (note.channelId != null) return;
+		if (note.user.requireSigninToViewContents && this.user == null) return;
 
 		if (isRenotePacked(note) && !isQuotePacked(note) && !this.withRenotes) return;
 
diff --git a/packages/backend/src/server/api/stream/channels/local-timeline.ts b/packages/backend/src/server/api/stream/channels/local-timeline.ts
index 491029f5de..c3cf78a24a 100644
--- a/packages/backend/src/server/api/stream/channels/local-timeline.ts
+++ b/packages/backend/src/server/api/stream/channels/local-timeline.ts
@@ -53,6 +53,7 @@ class LocalTimelineChannel extends Channel {
 		if (note.user.host !== null) return;
 		if (note.visibility !== 'public') return;
 		if (note.channelId != null) return;
+		if (note.user.requireSigninToViewContents && this.user == null) return;
 
 		// 関係ない返信は除外
 		if (note.reply && this.user && !this.following[note.userId]?.withReplies && !this.withReplies) {