diff --git a/leaf/Cargo.toml b/leaf/Cargo.toml
index 6dc913a49..3ff8d1829 100644
--- a/leaf/Cargo.toml
+++ b/leaf/Cargo.toml
@@ -252,7 +252,7 @@ jni = "0.21"
 # TUN
 [target.'cfg(any(target_os = "ios", target_os = "android", target_os = "macos", target_os = "linux"))'.dependencies]
 tun = { git = "https://github.com/eycorsican/rust-tun.git", branch = "fork", features = ["async"], optional = true }
-netstack-lwip = { git = "https://github.com/eycorsican/netstack-lwip.git", rev = "9c7f2e3", optional = true }
+netstack-lwip = { git = "https://github.com/eycorsican/netstack-lwip.git", rev = "9463bdf", optional = true }
 
 [target.'cfg(any(target_os = "macos", target_os = "linux"))'.dependencies]
 pnet_datalink = { version = "0.34", package = "pnet_datalink", optional = true }
diff --git a/leaf/src/proxy/tun/inbound.rs b/leaf/src/proxy/tun/inbound.rs
index 34a88c2f9..939564934 100644
--- a/leaf/src/proxy/tun/inbound.rs
+++ b/leaf/src/proxy/tun/inbound.rs
@@ -1,4 +1,5 @@
 use std::net::SocketAddr;
+use std::pin::Pin;
 use std::sync::Arc;
 
 use anyhow::{anyhow, Result};
@@ -23,7 +24,7 @@ use crate::{
 use super::netstack;
 
 async fn handle_inbound_stream(
-    stream: netstack::TcpStream,
+    stream: Pin<Box<netstack::TcpStream>>,
     local_addr: SocketAddr,
     remote_addr: SocketAddr,
     inbound_tag: String,
@@ -61,7 +62,7 @@ async fn handle_inbound_stream(
 }
 
 async fn handle_inbound_datagram(
-    socket: Box<netstack::UdpSocket>,
+    socket: Pin<Box<netstack::UdpSocket>>,
     inbound_tag: String,
     nat_manager: Arc<NatManager>,
     fakedns: Arc<FakeDns>,
diff --git a/leaf/src/proxy/vmess/crypto.rs b/leaf/src/proxy/vmess/crypto.rs
index af4310fee..5d79fc7ef 100644
--- a/leaf/src/proxy/vmess/crypto.rs
+++ b/leaf/src/proxy/vmess/crypto.rs
@@ -116,15 +116,10 @@ impl ShakeSizeParser {
 
 pub trait PaddingLengthGenerator {
     fn next_padding_len(&mut self) -> u16;
-    fn max_padding_len(&self) -> u16;
 }
 
 impl PaddingLengthGenerator for ShakeSizeParser {
     fn next_padding_len(&mut self) -> u16 {
         self.next() % 64
     }
-
-    fn max_padding_len(&self) -> u16 {
-        64
-    }
 }