diff --git a/gradle.properties b/gradle.properties
index cb1dc67..d63a7d4 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -5,7 +5,7 @@ MORNY_ARCHIVE_NAME = morny-coeur
 MORNY_CODE_STORE = https://github.com/Eyre-S/Coeur-Morny-Cono
 MORNY_COMMIT_PATH = https://github.com/Eyre-S/Coeur-Morny-Cono/commit/%s
 
-VERSION = 1.5.0-alpha.2
+VERSION = 1.5.0-alpha.3
 
 USE_DELTA = false
 VERSION_DELTA =
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/event/MornyOnUpdateTimestampOffsetLock.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/event/MornyOnUpdateTimestampOffsetLock.scala
index 734af34..fc3079a 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/event/MornyOnUpdateTimestampOffsetLock.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/event/MornyOnUpdateTimestampOffsetLock.scala
@@ -2,10 +2,12 @@ package cc.sukazyo.cono.morny.bot.event
 
 import cc.sukazyo.cono.morny.bot.api.{EventEnv, EventListener}
 import cc.sukazyo.cono.morny.MornyCoeur
+import cc.sukazyo.cono.morny.bot.event.MornyOnUpdateTimestampOffsetLock.ExpiredEvent
 
 class MornyOnUpdateTimestampOffsetLock (using coeur: MornyCoeur) extends EventListener {
 	
 	private def checkOutdated (timestamp: Int)(using event: EventEnv): Unit =
+		event.provide(ExpiredEvent)
 		if coeur.config.eventIgnoreOutdated && (timestamp < (coeur.coeurStartTimestamp/1000)) then
 			event.setEventCanceled
 	
@@ -15,3 +17,7 @@ class MornyOnUpdateTimestampOffsetLock (using coeur: MornyCoeur) extends EventLi
 	override def onEditedChannelPost (using event: EventEnv): Unit = checkOutdated(event.update.editedChannelPost.date)
 	
 }
+
+object MornyOnUpdateTimestampOffsetLock {
+	object ExpiredEvent
+}
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/event/OnOnAlias.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/event/OnOnAlias.scala
index bb44c48..b6484e7 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/event/OnOnAlias.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/event/OnOnAlias.scala
@@ -5,6 +5,7 @@ import cc.sukazyo.cono.morny.MornyCoeur
 import cc.sukazyo.cono.morny.util.tgapi.InputCommand
 import com.pengrad.telegrambot.model.Chat
 
+// fixme: not tested yet
 class OnOnAlias (using coeur: MornyCoeur) extends EventListener {
 	
 	override def onMessage (using event: EventEnv): Unit = {
diff --git a/src/main/scala/cc/sukazyo/cono/morny/bot/event/OnQuestionMarkReply.scala b/src/main/scala/cc/sukazyo/cono/morny/bot/event/OnQuestionMarkReply.scala
index ca180fb..177f400 100644
--- a/src/main/scala/cc/sukazyo/cono/morny/bot/event/OnQuestionMarkReply.scala
+++ b/src/main/scala/cc/sukazyo/cono/morny/bot/event/OnQuestionMarkReply.scala
@@ -4,6 +4,7 @@ import cc.sukazyo.cono.morny.bot.api.{EventEnv, EventListener}
 import cc.sukazyo.cono.morny.MornyCoeur
 import cc.sukazyo.cono.morny.bot.event.OnQuestionMarkReply.isAllMessageMark
 import cc.sukazyo.cono.morny.util.tgapi.TelegramExtensions.Bot.exec
+import cc.sukazyo.cono.morny.Log.logger
 import com.pengrad.telegrambot.request.{ForwardMessage, SendMessage}
 
 import scala.language.postfixOps
@@ -14,6 +15,19 @@ class OnQuestionMarkReply (using coeur: MornyCoeur) extends EventListener {
 	override def onMessage (using event: EventEnv): Unit = {
 		import event.update
 		
+		// FIXME: not tested yet, due to cannot connect to test bot
+		if boundary[Boolean] {
+			event.consume[MornyOnUpdateTimestampOffsetLock.ExpiredEvent.type] { _ =>
+				boundary.break(true)
+			}
+			false
+		} then {
+			logger.debug("OnQuestionMarkReply: expired event, skipped")
+			return
+		} else {
+			logger.debug("OnQuestionMarkReply: event continue")
+		}
+		
 		if update.message.text eq null then return
 		
 		import cc.sukazyo.cono.morny.util.UseMath.over