diff --git a/build.rs b/build.rs
index 78dd934..6ac144f 100644
--- a/build.rs
+++ b/build.rs
@@ -10,7 +10,7 @@ fn main() {
     #[allow(clippy::needless_borrow)]
     protobuf_codegen_pure::Codegen::new()
         .out_dir(out_dir)
-        .inputs(&["src/ttrpc.proto"])
+        .inputs(["src/ttrpc.proto"])
         .include("src")
         .run()
         .expect("Codegen failed.");
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..c058c59
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,4 @@
+[toolchain]
+channel="1.77.0"
+profile="default"
+components=["rustfmt", "clippy"]
diff --git a/src/asynchronous/client.rs b/src/asynchronous/client.rs
index 73ca310..c001b54 100644
--- a/src/asynchronous/client.rs
+++ b/src/asynchronous/client.rs
@@ -3,7 +3,6 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
-use nix::unistd::close;
 use protobuf::{CodedInputStream, Message};
 use std::collections::HashMap;
 use std::os::unix::io::RawFd;
@@ -158,19 +157,6 @@ impl Client {
     }
 }
 
-struct ClientClose {
-    fd: RawFd,
-    close_fd: RawFd,
-}
-
-impl Drop for ClientClose {
-    fn drop(&mut self) {
-        close(self.close_fd).unwrap();
-        close(self.fd).unwrap();
-        trace!("All client is droped");
-    }
-}
-
 // Spwan a task and transfer the response
 fn spawn_trans_resp(
     req_map: Arc<Mutex<HashMap<u32, ResponseSender>>>,