diff --git a/server/src/main.rs b/server/src/main.rs
index c489f37..159a76b 100644
--- a/server/src/main.rs
+++ b/server/src/main.rs
@@ -2,7 +2,7 @@
 #![forbid(unsafe_code)]
 
 use std::{pin::Pin, sync::Arc};
-use tokio::{fs::OpenOptions, io::AsyncWriteExt};
+use tokio::{fs::{File, OpenOptions}, io::AsyncWriteExt, sync::Mutex};
 use tokio_stream::{wrappers::ReceiverStream, Stream, StreamExt};
 use tonic::{transport::Server, Request, Response, Status};
 use tracing::{info, error};