diff --git a/ipc/codegen/src/serialization.rs b/ipc/codegen/src/serialization.rs
index 9854993c5..a249b3830 100644
--- a/ipc/codegen/src/serialization.rs
+++ b/ipc/codegen/src/serialization.rs
@@ -24,7 +24,6 @@ use syntax::ast::{
 use syntax::ast;
 use syntax::codemap::Span;
 use syntax::ext::base::{Annotatable, ExtCtxt};
-use syntax::ext::build::AstBuilder;
 use syntax::ptr::P;
 
 pub struct Error;
diff --git a/json/src/spec/engine.rs b/json/src/spec/engine.rs
index 7d81aaa5a..e877e37a8 100644
--- a/json/src/spec/engine.rs
+++ b/json/src/spec/engine.rs
@@ -16,8 +16,6 @@
 
 //! Engine deserialization.
 
-use serde::Deserializer;
-use serde::de::Visitor;
 use spec::Ethash;
 use spec::BasicAuthority;
 
diff --git a/util/src/io/service.rs b/util/src/io/service.rs
index 95aa19e47..d946463f5 100644
--- a/util/src/io/service.rs
+++ b/util/src/io/service.rs
@@ -18,11 +18,8 @@ use std::sync::*;
 use std::thread::{self, JoinHandle};
 use std::collections::HashMap;
 use mio::*;
-use hash::*;
-use rlp::*;
 use error::*;
 use io::{IoError, IoHandler};
-use arrayvec::*;
 use crossbeam::sync::chase_lev;
 use io::worker::{Worker, Work, WorkType};
 use panics::*;
diff --git a/util/src/keys/test_account_provider.rs b/util/src/keys/test_account_provider.rs
index b8aed85ce..34aa41a1a 100644
--- a/util/src/keys/test_account_provider.rs
+++ b/util/src/keys/test_account_provider.rs
@@ -19,7 +19,7 @@
 use std::sync::RwLock;
 use std::collections::HashMap;
 use std::io;
-use hash::{Address, FixedHash};
+use hash::Address;
 use crypto::{Secret, KeyPair};
 use super::store::{AccountProvider, SigningError, EncryptedHashMapError};
 
diff --git a/util/src/network/discovery.rs b/util/src/network/discovery.rs
index d755c58e7..d65309246 100644
--- a/util/src/network/discovery.rs
+++ b/util/src/network/discovery.rs
@@ -512,7 +512,6 @@ mod tests {
 	use crypto::KeyPair;
 	use std::str::FromStr;
 	use rustc_serialize::hex::FromHex;
-	use rlp::*;
 
 	#[test]
 	fn find_node() {
diff --git a/util/src/network/host.rs b/util/src/network/host.rs
index 971f3a424..13b64eb3c 100644
--- a/util/src/network/host.rs
+++ b/util/src/network/host.rs
@@ -16,7 +16,6 @@
 
 use std::net::{SocketAddr};
 use std::collections::{HashMap};
-use std::hash::{Hasher};
 use std::str::{FromStr};
 use std::sync::*;
 use std::ops::*;
@@ -897,7 +896,7 @@ impl<Message> IoHandler<NetworkIoMessage<Message>> for Host<Message> where Messa
 	fn timeout(&self, io: &IoContext<NetworkIoMessage<Message>>, token: TimerToken) {
 		match token {
 			IDLE => self.maintain_network(io),
-			INIT_PUBLIC => self.init_public_interface(io).unwrap_or_else(|e| 
+			INIT_PUBLIC => self.init_public_interface(io).unwrap_or_else(|e|
 				warn!("Error initializing public interface: {:?}", e)),
 			FIRST_SESSION ... LAST_SESSION => self.connection_timeout(token, io),
 			FIRST_HANDSHAKE ... LAST_HANDSHAKE => self.connection_timeout(token, io),
diff --git a/util/src/network/session.rs b/util/src/network/session.rs
index 614b7eeb6..6c0a20a14 100644
--- a/util/src/network/session.rs
+++ b/util/src/network/session.rs
@@ -17,7 +17,6 @@
 use std::net::SocketAddr;
 use std::io;
 use mio::*;
-use hash::*;
 use rlp::*;
 use network::connection::{EncryptedConnection, Packet};
 use network::handshake::Handshake;
@@ -58,7 +57,7 @@ pub enum SessionData {
 		data: Vec<u8>,
 		/// Packet protocol ID
 		protocol: &'static str,
-		/// Zero based packet ID 
+		/// Zero based packet ID
 		packet_id: u8,
 	},
 }
@@ -111,7 +110,7 @@ const PACKET_USER: u8 = 0x10;
 const PACKET_LAST: u8 = 0x7f;
 
 impl Session {
-	/// Create a new session out of comepleted handshake. This clones the handshake connection object 
+	/// Create a new session out of comepleted handshake. This clones the handshake connection object
 	/// and leaves the handhsake in limbo to be deregistered from the event loop.
 	pub fn new(h: &mut Handshake, host: &HostInfo) -> Result<Session, UtilError> {
 		let id = h.id.clone();
@@ -159,7 +158,7 @@ impl Session {
 	pub fn done(&self) -> bool {
 		self.expired() && !self.connection.is_sending()
 	}
-	/// Replace socket token 
+	/// Replace socket token
 	pub fn set_token(&mut self, token: StreamToken) {
 		self.connection.set_token(token);
 	}
@@ -172,7 +171,7 @@ impl Session {
 	/// Readable IO handler. Returns packet data if available.
 	pub fn readable<Message>(&mut self, io: &IoContext<Message>, host: &HostInfo) -> Result<SessionData, UtilError>  where Message: Send + Sync + Clone {
 		if self.expired() {
-			return Ok(SessionData::None) 
+			return Ok(SessionData::None)
 		}
 		match try!(self.connection.readable(io)) {
 			Some(data) => Ok(try!(self.read_packet(data, host))),
diff --git a/util/src/trie/node.rs b/util/src/trie/node.rs
index 2ebcd0ef0..8f9351d05 100644
--- a/util/src/trie/node.rs
+++ b/util/src/trie/node.rs
@@ -14,7 +14,6 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
-use hash::*;
 use nibbleslice::*;
 use bytes::*;
 use rlp::*;
@@ -34,14 +33,14 @@ pub enum Node<'a> {
 }
 
 impl<'a> Node<'a> {
-	/// Decode the `node_rlp` and return the Node. 
+	/// Decode the `node_rlp` and return the Node.
 	pub fn decoded(node_rlp: &'a [u8]) -> Node<'a> {
 		let r = Rlp::new(node_rlp);
 		match r.prototype() {
-			// either leaf or extension - decode first item with NibbleSlice::??? 
+			// either leaf or extension - decode first item with NibbleSlice::???
 			// and use is_leaf return to figure out which.
 			// if leaf, second item is a value (is_data())
-			// if extension, second item is a node (either SHA3 to be looked up and 
+			// if extension, second item is a node (either SHA3 to be looked up and
 			// fed back into this function or inline RLP which can be fed back into this function).
 			Prototype::List(2) => match NibbleSlice::from_encoded(r.at(0).data()) {
 				(slice, true) => Node::Leaf(slice, r.at(1).data()),
@@ -100,7 +99,7 @@ impl<'a> Node<'a> {
 	}
 
 	/// Encode the node, adding it to `journal` if necessary and return the RLP valid for
-	/// insertion into a parent node. 
+	/// insertion into a parent node.
 	pub fn encoded_and_added(&self, journal: &mut Journal) -> Bytes {
 		let mut stream = RlpStream::new();
 		match *self {
diff --git a/util/src/trie/sectriedb.rs b/util/src/trie/sectriedb.rs
index 3e74f8655..685af335b 100644
--- a/util/src/trie/sectriedb.rs
+++ b/util/src/trie/sectriedb.rs
@@ -17,7 +17,6 @@
 use hash::*;
 use sha3::*;
 use hashdb::*;
-use rlp::*;
 use super::triedb::*;
 use super::trietraits::*;
 
diff --git a/util/src/trie/sectriedbmut.rs b/util/src/trie/sectriedbmut.rs
index 7e17610f8..895a821c9 100644
--- a/util/src/trie/sectriedbmut.rs
+++ b/util/src/trie/sectriedbmut.rs
@@ -17,7 +17,6 @@
 use hash::*;
 use sha3::*;
 use hashdb::*;
-use rlp::*;
 use super::triedbmut::*;
 use super::trietraits::*;