diff --git a/.env.example b/.env.example
index 6f9a2956..1f003b4c 100644
--- a/.env.example
+++ b/.env.example
@@ -1,8 +1,7 @@
 SESSION_KEY=
 TRAQ_CALENDARID=
 CLIENT_ID=
-WEBHOOK_ID=
-WEBHOOK_SECRET=
+TRAQ_BOT_TOKEN=
 ACTIVITY_CHANNEL_ID=
 DAILY_CHANNEL_ID=
 TOKEN_KEY=
diff --git a/.gitignore b/.gitignore
index dd9b185d..e60c2a35 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,4 @@ debug
 
 # for development
 _development/*
+.env
\ No newline at end of file
diff --git a/README.md b/README.md
index 482d90ee..f8bc234f 100644
--- a/README.md
+++ b/README.md
@@ -35,8 +35,7 @@ knoQ の全ての機能を動作させるためには、追加の情報が必要
 | SESSION_KEY         | 環境変数 | `random32wordsXXXXXXXXXXXXXXXXXXX`     | session を暗号化するもの                               |
 | TRAQ_CALENDARID     | 環境変数 |                                        | 進捗部屋の提供元（公開されている google calendar の id なら何でもいい） |
 | CLIENT_ID           | 環境変数 | `d1hDlIRNfCBerXdZkH1VR8lJwCBpIuMgiv42` | 認証に必要                                          |
-| WEBHOOK_ID          | 環境変数 |                                        | Bot 情報                                         |
-| WEBHOOK_SECRET      | 環境変数 |                                        | Bot 情報                                         |
+| TRAQ_BOT_TOKEN          | 環境変数 |                                        | Bot 情報                                         |
 | CHANNEL_ID          | 環境変数 |                                        | Bot の送信先チャンネル (deprecated)                     |
 | DAILY_CHANNEL_ID    | 環境変数 |                                        | Bot が毎日定時に投稿する先のチャンネル                          |
 | ACTIVITY_CHANNEL_ID | 環境変数 |                                        | Bot が都度送信するチャンネル                               |
diff --git a/compose.yml b/compose.yml
index ec1953d3..f92f64fd 100755
--- a/compose.yml
+++ b/compose.yml
@@ -16,13 +16,12 @@ services:
       SESSION_KEY: ${SESSION_KEY:-random32wordsXXXXXXXXXXXXXXXXXXX}
       TRAQ_CALENDARID: ${TRAQ_CALENDARID}
       CLIENT_ID: ${CLIENT_ID:-d1hDlIRNfCBerXdZkH1VR8lJwCBpIuMgiv42}
-      WEBHOOK_ID: ${WEBHOOK_ID}
-      WEBHOOK_SECRET: ${WEBHOOK_SECRET}
       CHANNEL_ID: ${CHANNEL_ID}
       DAILY_CHANNEL_ID: ${DAILY_CHANNEL_ID}
       ACTIVITY_CHANNEL_ID: ${ACTIVITY_CHANNEL_ID}
       TOKEN_KEY: ${TOKEN_KEY:-random32wordsXXXXXXXXXXXXXXXXXXX}
       KNOQ_VERSION: ${KNOQ_VERSION:-dev}
+      TRAQ_BOT_TOKEN: ${TRAQ_BOT_TOKEN}
       DEVELOPMENT: true
       GORM_LOG_LEVEL: info
     ports:
@@ -30,10 +29,6 @@ services:
     depends_on:
       db:
         condition: service_healthy
-    develop:
-      watch:
-        - action: rebuild
-          path: ./
 
   db:
     image: mariadb:10.6.4
diff --git a/domain/domain.go b/domain/domain.go
index 80806cab..0421baf4 100644
--- a/domain/domain.go
+++ b/domain/domain.go
@@ -30,4 +30,5 @@ type Repository interface {
 	RoomRepository
 	TagRepository
 	UserRepository
+	PostRepository
 }
diff --git a/domain/post.go b/domain/post.go
new file mode 100644
index 00000000..57fe8dcb
--- /dev/null
+++ b/domain/post.go
@@ -0,0 +1,18 @@
+package domain
+
+import "github.com/gofrs/uuid"
+
+type Post struct {
+	MessageID uuid.UUID
+	EventID   uuid.UUID
+}
+
+type WritePostParams struct {
+	MessageID uuid.UUID
+	EventID   uuid.UUID
+}
+
+type PostRepository interface {
+	CreatePost(params WritePostParams) (*Post, error)
+	GetPost(MessageID uuid.UUID) (*Post, error)
+}
diff --git a/go.mod b/go.mod
index 097fef45..8de6aad6 100644
--- a/go.mod
+++ b/go.mod
@@ -20,6 +20,7 @@ require (
 	github.com/robfig/cron/v3 v3.0.1
 	github.com/stretchr/testify v1.9.0
 	github.com/traPtitech/go-traq v0.0.0-20240509050113-9343acbeec35
+	github.com/traPtitech/traq-ws-bot v1.1.3
 	go.uber.org/zap v1.27.0
 	golang.org/x/exp v0.0.0-20230522175609-2e198f4a06a1
 	golang.org/x/oauth2 v0.20.0
@@ -54,6 +55,7 @@ require (
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect
 	github.com/googleapis/enterprise-certificate-proxy v0.3.2 // indirect
 	github.com/gorilla/context v1.1.2 // indirect
+	github.com/gorilla/websocket v1.5.0 // indirect
 	github.com/imdario/mergo v0.3.12 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/jinzhu/now v1.1.5 // indirect
diff --git a/go.sum b/go.sum
index bca8f621..251d3ecd 100644
--- a/go.sum
+++ b/go.sum
@@ -102,6 +102,8 @@ github.com/gorilla/securecookie v1.1.2 h1:YCIWL56dvtr73r6715mJs5ZvhtnY73hBvEF8kX
 github.com/gorilla/securecookie v1.1.2/go.mod h1:NfCASbcHqRSY+3a8tlWJwsQap2VX5pwzwo4h3eOamfo=
 github.com/gorilla/sessions v1.2.2 h1:lqzMYz6bOfvn2WriPUjNByzeXIlVzURcPmgMczkmTjY=
 github.com/gorilla/sessions v1.2.2/go.mod h1:ePLdVu+jbEgHH+KWw8I1z2wqd0BAdAQh/8LRvBeoNcQ=
+github.com/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc=
+github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/imdario/mergo v0.3.12 h1:b6R2BslTbIEToALKP7LxUvijTsNI9TAe80pLWN2g/HU=
 github.com/imdario/mergo v0.3.12/go.mod h1:jmQim1M+e3UYxmgPu/WyfjB3N3VflVyUjjjwH0dnCYA=
 github.com/jinzhu/copier v0.4.0 h1:w3ciUoD19shMCRargcpm0cm91ytaBhDvuRpz1ODO/U8=
@@ -172,6 +174,8 @@ github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsT
 github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/traPtitech/go-traq v0.0.0-20240509050113-9343acbeec35 h1:NoEvHqFhmtyy7ELLp1chwM4R1vhXw2zKeEotkmKvSJw=
 github.com/traPtitech/go-traq v0.0.0-20240509050113-9343acbeec35/go.mod h1:7yJs1m/ddCG39XF78GA8FrXqyc4fNPfHp8BSLjMVMY8=
+github.com/traPtitech/traq-ws-bot v1.1.3 h1:Cehz+ORmz/j2HexJHtm6yS/lmAq99REpojfwj0vjjBY=
+github.com/traPtitech/traq-ws-bot v1.1.3/go.mod h1:mnUHbZiFLydoUxS2q8kzR1E+1RMRXrmEpUdSAxh0jvo=
 github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6KllzawFIhcdPw=
 github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
 github.com/valyala/fasttemplate v1.2.2 h1:lxLXG0uE3Qnshl9QyaK6XJxMXlQZELvChBOCmQD0Loo=
diff --git a/infra/bot/bot.go b/infra/bot/bot.go
new file mode 100644
index 00000000..55d7bfc8
--- /dev/null
+++ b/infra/bot/bot.go
@@ -0,0 +1,51 @@
+package bot
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/gofrs/uuid"
+	"github.com/traPtitech/knoQ/domain"
+	"github.com/traPtitech/knoQ/infra/db"
+	traqwsbot "github.com/traPtitech/traq-ws-bot"
+	"github.com/traPtitech/traq-ws-bot/payload"
+)
+
+var Bot *traqwsbot.Bot
+
+const (
+	AttendanceStampID = "93d376c3-80c9-4bb2-909b-2bbe2fbf9e93"
+	AbsentStampID     = "544c04db-9cc3-4c0e-935d-571d4cf103a2"
+	PendingStampID    = "bc9a3814-f185-4b3d-ac1f-3c8f12ad7b52"
+)
+
+func BotMessageStampsUpdatedHandler(p *payload.BotMessageStampsUpdated, gormRepo db.GormRepository) {
+	post, err := gormRepo.GetPost(uuid.FromStringOrNil(p.MessageID))
+	if err != nil {
+		fmt.Println(err)
+	}
+	for _, stamp := range p.Stamps {
+		if time.Now().After(stamp.UpdatedAt.Add(3 * time.Second)) {
+			// 3秒以上経過したスタンプは無視
+			continue
+		}
+		var scheduleStatus domain.ScheduleStatus
+		switch stamp.StampID {
+		case AttendanceStampID:
+			// 出席
+			scheduleStatus = domain.Attendance
+		case AbsentStampID:
+			// 欠席
+			scheduleStatus = domain.Absent
+		case PendingStampID:
+			// 未定
+			scheduleStatus = domain.Pending
+		default:
+			continue
+		}
+		err := gormRepo.UpsertEventSchedule(post.EventID, uuid.FromStringOrNil(stamp.UserID), scheduleStatus)
+		if err != nil {
+			fmt.Println(err)
+		}
+	}
+}
diff --git a/infra/db/converter.go b/infra/db/converter.go
index 59b142ed..f62cccd7 100644
--- a/infra/db/converter.go
+++ b/infra/db/converter.go
@@ -127,6 +127,12 @@ func ConvRoomTodomainRoom(src Room) (dst domain.Room) {
 	return
 }
 
+func ConvPostTodomainPost(src Post) (dst domain.Post) {
+	dst.MessageID = src.MessageID
+	dst.EventID = src.EventID
+	return
+}
+
 func ConvSEventAdminToSRoomAdmin(src []EventAdmin) (dst []RoomAdmin) {
 	dst = make([]RoomAdmin, len(src))
 	for i := range src {
@@ -261,6 +267,13 @@ func ConvWriteGroupParamsToGroup(src WriteGroupParams) (dst Group) {
 	}
 	return
 }
+
+func ConvWritePostParamsToPost(src WritePostParams) (dst Post) {
+	dst.MessageID = src.MessageID
+	dst.EventID = src.EventID
+	return
+}
+
 func ConvdomainEventTagParamsToEventTag(src domain.EventTagParams) (dst EventTag) {
 	dst.Tag.Name = src.Name
 	dst.Locked = src.Locked
diff --git a/infra/db/model.go b/infra/db/model.go
index d46c13ad..79464fbc 100644
--- a/infra/db/model.go
+++ b/infra/db/model.go
@@ -21,6 +21,7 @@ var tables = []interface{}{
 	EventTag{}, // Eventより下にないと、overrideされる
 	EventAdmin{},
 	EventAttendee{},
+	Post{},
 }
 
 type Model struct {
@@ -167,6 +168,11 @@ type EventAttendee struct {
 	Schedule int
 }
 
+type Post struct {
+	MessageID uuid.UUID `gorm:"type:char(36); primaryKey"`
+	EventID   uuid.UUID `gorm:"type:char(36); not null"`
+}
+
 // Event is event for gorm
 //
 //go:generate go run github.com/fuji8/gotypeconverter/cmd/gotypeconverter@latest -s Event -d domain.Event -o converter.go .
diff --git a/infra/db/post.go b/infra/db/post.go
new file mode 100644
index 00000000..1fb886fd
--- /dev/null
+++ b/infra/db/post.go
@@ -0,0 +1,36 @@
+package db
+
+import (
+	"github.com/gofrs/uuid"
+	"github.com/traPtitech/knoQ/domain"
+	"gorm.io/gorm"
+)
+
+type WritePostParams struct {
+	domain.WritePostParams
+}
+
+func (repo *GormRepository) CreatePost(params WritePostParams) (*Post, error) {
+	p, err := createPost(repo.db, params)
+	return p, defaultErrorHandling(err)
+}
+
+func (repo *GormRepository) GetPost(MessageID uuid.UUID) (*Post, error) {
+	post, err := getPost(repo.db, MessageID)
+	return post, defaultErrorHandling(err)
+}
+
+func createPost(db *gorm.DB, params WritePostParams) (*Post, error) {
+	post := ConvWritePostParamsToPost(params)
+	err := db.Create(&post).Error
+	if err != nil {
+		return nil, err
+	}
+	return &post, nil
+}
+
+func getPost(db *gorm.DB, messageID uuid.UUID) (*Post, error) {
+	post := Post{}
+	err := db.Take(&post, messageID).Error
+	return &post, err
+}
diff --git a/main.go b/main.go
index 0e722c0a..2303c19e 100644
--- a/main.go
+++ b/main.go
@@ -9,11 +9,13 @@ import (
 	"time"
 
 	"github.com/traPtitech/knoQ/domain"
+	"github.com/traPtitech/knoQ/infra/bot"
 	"github.com/traPtitech/knoQ/infra/db"
 	"github.com/traPtitech/knoQ/infra/traq"
 	"github.com/traPtitech/knoQ/repository"
 	"github.com/traPtitech/knoQ/utils"
 	"github.com/traPtitech/knoQ/utils/tz"
+	"github.com/traPtitech/traq-ws-bot/payload"
 	"golang.org/x/oauth2"
 
 	"github.com/traPtitech/knoQ/router"
@@ -21,6 +23,8 @@ import (
 	"github.com/gorilla/sessions"
 	"github.com/robfig/cron/v3"
 	"go.uber.org/zap"
+
+	traqwsbot "github.com/traPtitech/traq-ws-bot"
 )
 
 var (
@@ -39,8 +43,6 @@ var (
 	clientID          = getenv("CLIENT_ID", "client_id")
 	origin            = getenv("ORIGIN", "http://localhost:3000")
 	sessionKey        = getenv("SESSION_KEY", "random32wordsXXXXXXXXXXXXXXXXXXX")
-	webhookID         = getenv("WEBHOOK_ID", "")
-	webhookSecret     = getenv("WEBHOOK_SECRET", "")
 	activityChannelID = getenv("ACTIVITY_CHANNEL_ID", "")
 	dailyChannelID    = getenv("DAILY_CHANNEL_ID", "")
 )
@@ -83,8 +85,6 @@ func main() {
 			HttpOnly: true,
 			SameSite: http.SameSiteLaxMode,
 		},
-		WebhookID:         webhookID,
-		WebhookSecret:     webhookSecret,
 		ActivityChannelID: activityChannelID,
 		DailyChannelId:    dailyChannelID,
 		Origin:            origin,
@@ -92,15 +92,13 @@ func main() {
 
 	e := handler.SetupRoute()
 
-	// webhook
+	// cron
 	c := cron.New(cron.WithLocation(tz.JST))
 	_, err = c.AddFunc(
 		"0 8 * * *",
 		utils.InitPostEventToTraQ(
 			&repo.GormRepo,
-			handler.WebhookSecret,
 			handler.DailyChannelId,
-			handler.WebhookID,
 			handler.Origin,
 		),
 	)
@@ -115,10 +113,27 @@ func main() {
 			e.Logger.Info("shutting down the server")
 		}
 	}()
+
+	// bot
+	bot.Bot, err = traqwsbot.NewBot(&traqwsbot.Options{
+		AccessToken: os.Getenv("TRAQ_BOT_TOKEN"),
+	})
+	if err != nil {
+		panic(err)
+	}
+	bot.Bot.OnBotMessageStampsUpdated(func(p *payload.BotMessageStampsUpdated) {
+		bot.BotMessageStampsUpdatedHandler(p, gormRepo)
+	})
+
+	if err := bot.Bot.Start(); err != nil {
+		panic(err)
+	}
+
 	quit := make(chan os.Signal, 1)
 	signal.Notify(quit, os.Interrupt)
 	<-quit
 	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+
 	defer cancel()
 	if err := e.Shutdown(ctx); err != nil {
 		e.Logger.Fatal(err)
diff --git a/migration/current.go b/migration/current.go
index b4790920..f0660043 100644
--- a/migration/current.go
+++ b/migration/current.go
@@ -19,5 +19,6 @@ func Migrations() []*gormigrate.Migration {
 		v10(),
 		v11(),
 		v12(),
+		v13(),
 	}
 }
diff --git a/migration/v13.go b/migration/v13.go
new file mode 100644
index 00000000..7b1a8915
--- /dev/null
+++ b/migration/v13.go
@@ -0,0 +1,25 @@
+package migration
+
+import (
+	"github.com/go-gormigrate/gormigrate/v2"
+	"github.com/gofrs/uuid"
+	"gorm.io/gorm"
+)
+
+type v13Post struct {
+	MessageID uuid.UUID `gorm:"type:char(36); primaryKey"`
+	EventID   uuid.UUID `gorm:"type:char(36); not null"`
+}
+
+func (*v13Post) TableName() string {
+	return "posts"
+}
+
+func v13() *gormigrate.Migration {
+	return &gormigrate.Migration{
+		ID: "13",
+		Migrate: func(db *gorm.DB) error {
+			return db.Migrator().CreateTable(&v13Post{})
+		},
+	}
+}
diff --git a/repository/post.go b/repository/post.go
new file mode 100644
index 00000000..ff5b4607
--- /dev/null
+++ b/repository/post.go
@@ -0,0 +1,28 @@
+package repository
+
+import (
+	"github.com/gofrs/uuid"
+	"github.com/traPtitech/knoQ/domain"
+	"github.com/traPtitech/knoQ/infra/db"
+)
+
+func (repo *Repository) CreatePost(params domain.WritePostParams) (*domain.Post, error) {
+	p := db.WritePostParams{
+		WritePostParams: params,
+	}
+	post, err := repo.GormRepo.CreatePost(p)
+	if err != nil {
+		return nil, defaultErrorHandling(err)
+	}
+	domainPost := db.ConvPostTodomainPost(*post)
+	return &domainPost, nil
+}
+
+func (repo *Repository) GetPost(MessageID uuid.UUID) (*domain.Post, error) {
+	post, err := repo.GormRepo.GetPost(MessageID)
+	if err != nil {
+		return nil, defaultErrorHandling(err)
+	}
+	domainPost := db.ConvPostTodomainPost(*post)
+	return &domainPost, nil
+}
diff --git a/router/middleware.go b/router/middleware.go
index 77feb07d..939c30fe 100644
--- a/router/middleware.go
+++ b/router/middleware.go
@@ -176,8 +176,8 @@ func (h *Handlers) RoomAdminsMiddleware(next echo.HandlerFunc) echo.HandlerFunc
 	}
 }
 
-// WebhookEventHandler is used with middleware.BodyDump
-func (h *Handlers) WebhookEventHandler(c echo.Context, reqBody, resBody []byte) {
+// BotEventHandler is used with middleware.BodyDump
+func (h *Handlers) BotEventHandler(c echo.Context, reqBody, resBody []byte) {
 	if c.Response().Status >= 400 {
 		return
 	}
@@ -220,9 +220,19 @@ func (h *Handlers) WebhookEventHandler(c echo.Context, reqBody, resBody []byte)
 		}
 	}
 
-	content := presentation.GenerateEventWebhookContent(c.Request().Method, e, notificationTargets, h.Origin, !domain.DEVELOPMENT)
+	content := presentation.GenerateEventBotContent(c.Request().Method, e, notificationTargets, h.Origin, !domain.DEVELOPMENT)
 
-	_ = utils.RequestWebhook(content, h.WebhookSecret, h.ActivityChannelID, h.WebhookID, 1)
+	messageID, err := utils.RequestBotPost(content, h.ActivityChannelID)
+	if err != nil {
+		h.Logger.Error("failed to request bot post", zap.Error(err))
+		return
+	}
+	err = utils.RequestBotStatusStamp(messageID)
+	if err != nil {
+		h.Logger.Error("failed to request bot status stamp", zap.Error(err))
+		return
+	}
+	h.Repo.CreatePost(domain.WritePostParams{MessageID: messageID, EventID: e.ID})
 }
 
 // getRequestUserID sessionからuserを返します
diff --git a/router/presentation/event.go b/router/presentation/event.go
index 04d55127..9c6c2347 100644
--- a/router/presentation/event.go
+++ b/router/presentation/event.go
@@ -162,7 +162,7 @@ func ICalFormat(events []*domain.Event, host string, userMap map[uuid.UUID]*doma
 	return cal
 }
 
-func GenerateEventWebhookContent(method string, e *EventDetailRes, nofiticationTargets []string, origin string, isMention bool) string {
+func GenerateEventBotContent(method string, e *EventDetailRes, nofiticationTargets []string, origin string, isMention bool) string {
 	timeFormat := "01/02(Mon) 15:04"
 	var content string
 	switch method {
diff --git a/router/router.go b/router/router.go
index 9855d1f1..dc87be3a 100644
--- a/router/router.go
+++ b/router/router.go
@@ -25,8 +25,6 @@ type Handlers struct {
 	SessionKey        []byte
 	SessionOption     sessions.Options
 	ClientID          string
-	WebhookID         string
-	WebhookSecret     string
 	ActivityChannelID string
 	DailyChannelId    string
 	Origin            string
@@ -90,7 +88,7 @@ func (h *Handlers) SetupRoute() *echo.Echo {
 		eventsAPI := apiWithAuth.Group("/events")
 		{
 			eventsAPI.GET("", h.HandleGetEvents)
-			eventsAPI.POST("", h.HandlePostEvent, middleware.BodyDump(h.WebhookEventHandler))
+			eventsAPI.POST("", h.HandlePostEvent, middleware.BodyDump(h.BotEventHandler))
 			eventsAPI.GET("/:eventid", h.HandleGetEvent)
 			eventsAPI.PUT("/:eventid/attendees/me", h.HandleUpsertMeEventSchedule)
 			eventsAPI.POST("/:eventid/tags", h.HandleAddEventTag)
@@ -99,7 +97,7 @@ func (h *Handlers) SetupRoute() *echo.Echo {
 			// イベント管理者権限が必要
 			eventsAPIWithAdminAuth := eventsAPI.Group("", h.EventAdminsMiddleware)
 			{
-				eventsAPIWithAdminAuth.PUT("/:eventid", h.HandleUpdateEvent, middleware.BodyDump(h.WebhookEventHandler))
+				eventsAPIWithAdminAuth.PUT("/:eventid", h.HandleUpdateEvent, middleware.BodyDump(h.BotEventHandler))
 				eventsAPIWithAdminAuth.DELETE("/:eventid", h.HandleDeleteEvent)
 			}
 		}
diff --git a/utils/api.go b/utils/api.go
index 1932e508..4fc27736 100644
--- a/utils/api.go
+++ b/utils/api.go
@@ -2,36 +2,33 @@ package utils
 
 import (
 	"context"
-	"crypto/hmac"
-	"crypto/sha1"
-	"encoding/hex"
-	"errors"
-	"net/http"
 
+	"github.com/gofrs/uuid"
 	"github.com/traPtitech/go-traq"
+	"github.com/traPtitech/knoQ/infra/bot"
 )
 
-// RequestWebhook q.trap/jp にメッセージを送信します。
-func RequestWebhook(message, secret, channelID, webhookID string, embed int) error {
-	configuration := traq.NewConfiguration()
-	apiClient := traq.NewAPIClient(configuration)
+// RequestBotPost q.trap/jp にメッセージを送信します。
+func RequestBotPost(messageText, channelID string) (uuid.UUID, error) {
+	message, _, err := bot.Bot.API().
+		MessageApi.
+		PostMessage(context.Background(), channelID).
+		PostMessageRequest(traq.PostMessageRequest{
+			Content: messageText,
+		}).
+		Execute()
+	return uuid.FromStringOrNil(message.Id), err
+}
 
-	xTRAQSignature := calcSignature(message, secret)
-	res, err := apiClient.WebhookApi.PostWebhook(context.TODO(), webhookID).
-		XTRAQChannelId(channelID).XTRAQSignature(xTRAQSignature).
-		Embed(int32(embed)).Body(message).Execute()
-	if err != nil {
-		return err
-	}
-	if res.StatusCode >= 400 {
-		return errors.New(http.StatusText(res.StatusCode))
+// RequestBotStatusStamp :white_check_mark:, :no_entry_sign:, :loading: のスタンプを送信します。
+func RequestBotStatusStamp(messageID uuid.UUID) error {
+	stamps := []string{bot.AttendanceStampID, bot.AbsentStampID, bot.PendingStampID}
+	for _, stampID := range stamps {
+		_, err := bot.Bot.API().
+			MessageApi.AddMessageStamp(context.Background(), messageID.String(), stampID).Execute()
+		if err != nil {
+			return err
+		}
 	}
-
 	return nil
 }
-
-func calcSignature(message, secret string) string {
-	mac := hmac.New(sha1.New, []byte(secret))
-	mac.Write([]byte(message))
-	return hex.EncodeToString(mac.Sum(nil))
-}
diff --git a/utils/cron.go b/utils/cron.go
index 545f6644..ac1f9280 100644
--- a/utils/cron.go
+++ b/utils/cron.go
@@ -20,8 +20,8 @@ type timeTable struct {
 }
 
 // InitPostEventToTraQ 現在(job実行)から24時間以内に始まるイベントを取得し、
-// webhookでtraQに送るjobを作成。
-func InitPostEventToTraQ(repo *db.GormRepository, secret, channelID, webhookID, origin string) func() {
+// botでtraQに送るjobを作成。
+func InitPostEventToTraQ(repo *db.GormRepository, channelID, origin string) func() {
 	job := func() {
 		now := setTimeFromString(time.Now().In(tz.JST), "06:00:00")
 		tomorrow := now.AddDate(0, 0, 1)
@@ -29,7 +29,7 @@ func InitPostEventToTraQ(repo *db.GormRepository, secret, channelID, webhookID,
 		rooms, _ := repo.GetAllRooms(now, tomorrow, uuid.Nil)
 		events, _ := repo.GetAllEvents(filter.FilterTime(now, tomorrow))
 		message := createMessage(now, rooms, events, origin)
-		err := RequestWebhook(message, secret, channelID, webhookID, 1)
+		_, err := RequestBotPost(message, channelID)
 		if err != nil {
 			fmt.Println(err)
 		}