diff --git a/adapters/slack/package.json b/adapters/slack/package.json
index 129f433f..578f1650 100644
--- a/adapters/slack/package.json
+++ b/adapters/slack/package.json
@@ -30,7 +30,6 @@
   },
   "dependencies": {
     "@slack/types": "^2.8.0",
-    "form-data": "^4.0.0",
-    "seratch-slack-types": "^0.8.0"
+    "form-data": "^4.0.0"
   }
 }
diff --git a/adapters/slack/src/bot.ts b/adapters/slack/src/bot.ts
index 5be04326..8845d9a0 100644
--- a/adapters/slack/src/bot.ts
+++ b/adapters/slack/src/bot.ts
@@ -5,7 +5,6 @@ import { adaptChannel, adaptGuild, adaptMessage, adaptUser, AuthTestResponse } f
 import { SlackMessageEncoder } from './message'
 import { GenericMessageEvent, SlackChannel, SlackTeam, SlackUser } from './types'
 import FormData from 'form-data'
-import * as WebApi from 'seratch-slack-types/web-api'
 import { Internal, Token } from './types/internal'
 
 export class SlackBot<T extends SlackBot.Config = SlackBot.Config> extends Bot<T> {
diff --git a/adapters/slack/src/utils.ts b/adapters/slack/src/utils.ts
index fc5b1538..77dc7120 100644
--- a/adapters/slack/src/utils.ts
+++ b/adapters/slack/src/utils.ts
@@ -169,15 +169,18 @@ export async function adaptSession(bot: SlackBot, payload: EnvelopedEvent<SlackE
       session.channelId = input.channel
       await adaptMessage(bot, input as unknown as GenericMessageEvent, session)
     }
-    if (input.subtype === 'message_deleted') adaptMessageDeleted(bot, input as unknown as MessageDeletedEvent, session)
-    if (input.subtype === 'message_changed') {
+    else if (input.subtype === 'message_deleted') adaptMessageDeleted(bot, input as unknown as MessageDeletedEvent, session)
+    else if (input.subtype === 'message_changed') {
       const evt = input as unknown as MessageChangedEvent
+      if (evt.message.subtype === 'thread_broadcast') return
       session.type = 'message-updated'
       // @ts-ignore
       session.guildId = payload.team_id
       session.isDirect = input.channel_type === 'im'
       session.channelId = input.channel
       await adaptMessage(bot, evt.message, session)
+    } else {
+      return
     }
   } else if (payload.event.type === 'channel_left') {
     session.type = 'channel-removed'