diff --git a/Cargo.lock b/Cargo.lock
index 3033102..3586ad0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4239,7 +4239,7 @@ checksum = "3c5e1a9a646d36c3599cd173a41282daf47c44583ad367b8e6837255952e5c67"
 [[package]]
 name = "smoltcp"
 version = "0.12.0"
-source = "git+https://github.com/XOR-op/smoltcp.git?branch=rcv-buf-pinned#121f0dc014b24de595a9a0532ac475b31901cf22"
+source = "git+https://github.com/XOR-op/smoltcp.git?branch=rcv-buf-pinned#89b7dc984eee4683f85f426df582d783470dcf4b"
 dependencies = [
  "bitflags 1.3.2",
  "byteorder",
diff --git a/boltconn/src/transport/smol.rs b/boltconn/src/transport/smol.rs
index f8823ac..8af43dd 100644
--- a/boltconn/src/transport/smol.rs
+++ b/boltconn/src/transport/smol.rs
@@ -201,7 +201,7 @@ impl TcpConnTask {
         // Receive data
         let mut has_activity = false;
         let mut accum_bytes = 0;
-        while socket.can_recv() && self.back_tx.capacity() > 0 {
+        while socket.can_recv() && !self.back_tx.is_closed() && self.back_tx.capacity() > 0 {
             let mut buf = BytesMut::with_capacity(MAX_PKT_SIZE);
             if let Ok(size) = socket.recv_slice(unsafe { mut_buf(&mut buf) }) {
                 unsafe { buf.advance_mut(size) };