diff --git a/.gitignore b/.gitignore
index 586695e..84a5e2e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /local.db
+/local.db-journal
diff --git a/bot/bot.go b/bot/bot.go
index 166eed3..c0e3b33 100644
--- a/bot/bot.go
+++ b/bot/bot.go
@@ -23,8 +23,7 @@ type Bot struct {
 	federation        bool
 	prefix            string
 	domain            string
-	rooms             map[string]id.RoomID
-	roomsmu           *sync.Mutex
+	rooms             sync.Map
 	log               *logger.Logger
 	lp                *linkpearl.Linkpearl
 	handledJoinEvents sync.Map
@@ -35,9 +34,9 @@ func New(lp *linkpearl.Linkpearl, log *logger.Logger, prefix, domain string, noo
 	return &Bot{
 		noowner:    noowner,
 		federation: federation,
-		roomsmu:    &sync.Mutex{},
 		prefix:     prefix,
 		domain:     domain,
+		rooms:      sync.Map{},
 		log:        log,
 		lp:         lp,
 	}
@@ -170,14 +169,15 @@ func (b *Bot) sendFiles(ctx context.Context, roomID id.RoomID, files []*utils.Fi
 
 // GetMappings returns mapping of mailbox = room
 func (b *Bot) GetMapping(mailbox string) (id.RoomID, bool) {
-	if len(b.rooms) == 0 {
-		err := b.syncRooms()
-		if err != nil {
-			return "", false
-		}
+	v, ok := b.rooms.Load(mailbox)
+	if !ok {
+		return "", ok
+	}
+	roomID, ok := v.(id.RoomID)
+	if !ok {
+		return "", ok
 	}
 
-	roomID, ok := b.rooms[mailbox]
 	return roomID, ok
 }
 
diff --git a/bot/command.go b/bot/command.go
index 127dbb2..a77f765 100644
--- a/bot/command.go
+++ b/bot/command.go
@@ -154,9 +154,7 @@ func (b *Bot) runStop(ctx context.Context) {
 		return
 	}
 
-	b.roomsmu.Lock()
-	delete(b.rooms, mailbox)
-	b.roomsmu.Unlock()
+	b.rooms.Delete(mailbox)
 
 	err = b.setSettings(evt.RoomID, settings{})
 	if err != nil {
@@ -230,9 +228,7 @@ func (b *Bot) setOption(ctx context.Context, name, value string) {
 	if name == optionMailbox {
 		msg = msg + "@" + b.domain
 		cfg.Set(optionOwner, evt.Sender.String())
-		b.roomsmu.Lock()
-		b.rooms[value] = evt.RoomID
-		b.roomsmu.Unlock()
+		b.rooms.Store(value, evt.RoomID)
 	}
 
 	err = b.setSettings(evt.RoomID, cfg)
diff --git a/bot/data.go b/bot/data.go
index e4705d9..c79b5c4 100644
--- a/bot/data.go
+++ b/bot/data.go
@@ -58,14 +58,10 @@ func (b *Bot) migrate() error {
 }
 
 func (b *Bot) syncRooms() error {
-	b.roomsmu.Lock()
-	defer b.roomsmu.Unlock()
-
 	resp, err := b.lp.GetClient().JoinedRooms()
 	if err != nil {
 		return err
 	}
-	b.rooms = make(map[string]id.RoomID, len(resp.JoinedRooms))
 	for _, roomID := range resp.JoinedRooms {
 		b.migrateSettings(roomID)
 		cfg, serr := b.getSettings(roomID)
@@ -75,7 +71,7 @@ func (b *Bot) syncRooms() error {
 		}
 		mailbox := cfg.Mailbox()
 		if mailbox != "" {
-			b.rooms[mailbox] = roomID
+			b.rooms.Store(mailbox, roomID)
 		}
 	}