diff --git a/src/lib.rs b/src/lib.rs
index a9079fb..19391dc 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -14,8 +14,6 @@ use config_watcher::ServiceChange;
 pub use constants::UDP_BUFFER_SIZE;
 
 use anyhow::Result;
-use clap::arg;
-use tokio::join;
 use tokio::sync::{broadcast, mpsc};
 use tracing::{debug, info};
 
@@ -113,8 +111,8 @@ pub async fn run(args: Cli, shutdown_rx: broadcast::Receiver<bool>) -> Result<()
     }
 
     let _ = shutdown_tx.send(true);
-    if let Some((h,sender)) = last_instance{
-        h.await;
+    if let Some((h,_)) = last_instance{
+        h.await?;
     }
     Ok(())
 }
diff --git a/src/transport/quic.rs b/src/transport/quic.rs
index fb31eab..1afb853 100644
--- a/src/transport/quic.rs
+++ b/src/transport/quic.rs
@@ -1,10 +1,7 @@
-use std::borrow::{Borrow, BorrowMut};
+use std::borrow::{BorrowMut};
 use std::fmt::{Debug, Formatter};
-use std::io;
 use std::io::{Error, IoSlice};
 use std::net::SocketAddr;
-use std::ops::Deref;
-use std::ops::DerefMut;
 use std::pin::Pin;
 use std::sync::Arc;
 use std::task::Poll;
@@ -16,16 +13,13 @@ use anyhow::{anyhow, Context, Result};
 use async_trait::async_trait;
 use futures_util::{StreamExt};
 use openssl::pkcs12::Pkcs12;
-use quinn::{Connecting, Connection, Endpoint, EndpointConfig, Incoming, NewConnection};
-use rustls::internal::msgs::codec::Codec;
-use rustls::ClientConfig;
+use quinn::{Connecting, Connection, Endpoint, EndpointConfig, Incoming};
 use tokio::fs;
-use tokio::io::{AsyncRead, AsyncWrite, ReadBuf};
+use tokio::io::{AsyncWrite, ReadBuf};
 use tokio::net::{ToSocketAddrs, UdpSocket};
 use tokio_native_tls::native_tls::Certificate;
 
 pub const ALPN_QUIC_TUNNEL: &[&[u8]] = &[b"qt"];
-pub const NONE: &str = "None";
 
 pub struct QuicTransport {
     config: TlsConfig,
@@ -51,7 +45,7 @@ pub struct QuicBiStream {
 }
 
 impl QuicBiStream {
-    fn new((mut send, recv): (quinn::SendStream, quinn::RecvStream), conn: Connection) -> Self {
+    fn new((send, recv): (quinn::SendStream, quinn::RecvStream), conn: Connection) -> Self {
         Self { send, recv, conn}
     }
 }
@@ -143,7 +137,7 @@ impl Transport for QuicTransport {
                 roots.add(&rustls::Certificate(
                     cert.to_der()
                         .with_context(|| "could not encode trust root as DER")?,
-                ));
+                )).with_context(|| "adding trusted root cert to trust store")?;
 
                 let mut client_crypto = rustls::ClientConfig::builder()
                     .with_safe_defaults()
diff --git a/tests/integration_test.rs b/tests/integration_test.rs
index fcf2cf6..9be2784 100644
--- a/tests/integration_test.rs
+++ b/tests/integration_test.rs
@@ -148,7 +148,7 @@ async fn test(config_path: &'static str, t: Type) -> Result<()> {
     // Simulate the server crash and restart
     info!("shutdown the server");
     server_shutdown_tx.send(true)?;
-    let j = tokio::join!(server);
+    let _ = tokio::join!(server);
 
     info!("restart the server");
     let server_shutdown_rx = server_shutdown_tx.subscribe();