diff --git a/adapters/telegram/package.json b/adapters/telegram/package.json
index 877d4a7c..0117307b 100644
--- a/adapters/telegram/package.json
+++ b/adapters/telegram/package.json
@@ -33,6 +33,7 @@
     "@satorijs/satori": "^2.5.4"
   },
   "dependencies": {
+    "file-type": "^16.5.4",
     "form-data": "^4.0.0"
   }
 }
diff --git a/adapters/telegram/src/bot.ts b/adapters/telegram/src/bot.ts
index 8454d5f9..2e9305a3 100644
--- a/adapters/telegram/src/bot.ts
+++ b/adapters/telegram/src/bot.ts
@@ -4,6 +4,7 @@ import { adaptAuthorMeta, adaptGuildMember, adaptMessageMeta, adaptUser } from '
 import { TelegramMessageEncoder } from './message'
 import { HttpServer } from './server'
 import { HttpPolling } from './polling'
+import FileType from 'file-type'
 
 const logger = new Logger('telegram')
 
@@ -270,7 +271,10 @@ export class TelegramBot<T extends TelegramBot.Config = TelegramBot.Config> exte
     if (this.server) {
       return { url: `${this.server}/${filePath}` }
     }
-    const { mime, data } = await this.$getFile(filePath)
+    let { mime, data } = await this.$getFile(filePath)
+    if (mime === 'application/octet-stream') {
+      mime = await FileType.fromBuffer(data)?.mime
+    }
     const base64 = `data:${mime};base64,` + arrayBufferToBase64(data)
     return { url: base64 }
   }