diff --git a/Cargo.toml b/Cargo.toml
index 1e1b25e..b6c49ac 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,9 +22,9 @@ fibers_timeout_queue = "0.1"
 fibers_transport = "0.1.3"
 futures = "0.1"
 rand = "0.8"
-stun_codec = "0.2"
+stun_codec = "0.3"
 trackable = "1"
 
 [dev-dependencies]
-clap = { version = "3", features = ["derive"] }
+clap = { version = "4", features = ["derive"] }
 fibers_global = "0.1"
diff --git a/src/lib.rs b/src/lib.rs
index f85db6b..6329b64 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -70,16 +70,6 @@
 //!
 //! [RFC 5389]: https://tools.ietf.org/html/rfc5389
 #![warn(missing_docs)]
-extern crate bytecodec;
-extern crate factory;
-extern crate fibers;
-#[cfg(test)]
-extern crate fibers_global;
-extern crate fibers_timeout_queue;
-extern crate fibers_transport;
-extern crate futures;
-extern crate rand;
-extern crate stun_codec;
 #[macro_use]
 extern crate trackable;
 
diff --git a/src/message.rs b/src/message.rs
index bb2aab9..5b9a2cb 100644
--- a/src/message.rs
+++ b/src/message.rs
@@ -331,7 +331,7 @@ impl<A: Attribute> ErrorResponse<A> {
             request.method(),
             request.transaction_id(),
         );
-        message.add_attribute(error.into());
+        message.add_attribute(error);
         ErrorResponse(message)
     }
 
diff --git a/src/server.rs b/src/server.rs
index 656a5b7..2ba045b 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -15,7 +15,7 @@ use factory::DefaultFactory;
 use factory::Factory;
 use fibers::sync::mpsc;
 use fibers::{BoxSpawn, Spawn};
-use fibers_transport::{self, FixedPeerTransporter, TcpTransport, UdpTransport};
+use fibers_transport::{FixedPeerTransporter, TcpTransport, UdpTransport};
 use futures::{Async, Future, Poll, Stream};
 use std::fmt;
 use std::net::SocketAddr;