diff --git a/Cargo.lock b/Cargo.lock
index f583a8747..627fbfa69 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -219,7 +219,6 @@ dependencies = [
  "num_cpus 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "rust-crypto 0.2.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc_version 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -243,7 +242,6 @@ dependencies = [
  "jsonrpc-http-server 3.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc_version 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_codegen 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -299,7 +297,6 @@ dependencies = [
  "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "rayon 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc_version 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
diff --git a/Cargo.toml b/Cargo.toml
index b572749c0..196807a04 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,19 +27,12 @@ ethcore-devtools = { path = "devtools" }
 ethcore-rpc = { path = "rpc", optional = true }
 rpassword = "0.1"
 
-[dev-dependencies]
-ethcore = { path = "ethcore", features = ["dev"] }
-ethcore-util = { path = "util", features = ["dev"] }
-ethsync = { path = "sync", features = ["dev"] }
-ethcore-rpc = { path = "rpc", features = ["dev"] }
-
 [features]
 default = ["rpc"]
 rpc = ["ethcore-rpc"]
-dev = ["ethcore/dev", "ethcore-util/dev", "ethsync/dev", "ethcore-rpc/dev"]
-dev-clippy = ["clippy", "ethcore/clippy", "ethcore-util/clippy", "ethsync/clippy", "ethcore-rpc/clippy"]
+dev = ["clippy", "ethcore/dev", "ethcore-util/dev", "ethsync/dev", "ethcore-rpc/dev"]
 travis-beta = ["ethcore/json-tests"]
-travis-nightly = ["ethcore/json-tests", "dev-clippy", "dev"]
+travis-nightly = ["ethcore/json-tests", "dev"]
 
 [[bin]]
 path = "parity/main.rs"
diff --git a/cargo.sh b/cargo.sh
deleted file mode 100755
index 6870ab385..000000000
--- a/cargo.sh
+++ /dev/null
@@ -1,2 +0,0 @@
-#!/bin/sh
-cargo "$@" --features dev-clippy
diff --git a/ethcore/Cargo.toml b/ethcore/Cargo.toml
index fbfe175d7..c3a3d32dc 100644
--- a/ethcore/Cargo.toml
+++ b/ethcore/Cargo.toml
@@ -5,10 +5,6 @@ license = "GPL-3.0"
 name = "ethcore"
 version = "0.9.99"
 authors = ["Ethcore <admin@ethcore.io>"]
-build = "build.rs"
-
-[build-dependencies]
-rustc_version = "0.1"
 
 [dependencies]
 log = "0.3"
@@ -31,5 +27,5 @@ jit = ["evmjit"]
 evm-debug = []
 json-tests = []
 test-heavy = []
-dev = []
+dev = ["clippy"]
 default = []
diff --git a/ethcore/build.rs b/ethcore/build.rs
deleted file mode 100644
index 41b9a1b3e..000000000
--- a/ethcore/build.rs
+++ /dev/null
@@ -1,25 +0,0 @@
-// Copyright 2015, 2016 Ethcore (UK) Ltd.
-// This file is part of Parity.
-
-// Parity is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-
-// Parity is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-
-// You should have received a copy of the GNU General Public License
-// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
-
-extern crate rustc_version;
-
-use rustc_version::{version_meta, Channel};
-
-fn main() {
-	if let Channel::Nightly = version_meta().channel {
-		println!("cargo:rustc-cfg=nightly");
-	}
-}
diff --git a/ethcore/src/basic_types.rs b/ethcore/src/basic_types.rs
index 9cba8b3a0..5f6515c0d 100644
--- a/ethcore/src/basic_types.rs
+++ b/ethcore/src/basic_types.rs
@@ -24,7 +24,7 @@ pub type LogBloom = H2048;
 /// Constant 2048-bit datum for 0. Often used as a default.
 pub static ZERO_LOGBLOOM: LogBloom = H2048([0x00; 256]);
 
-#[cfg_attr(all(nightly, feature="dev"), allow(enum_variant_names))]
+#[cfg_attr(feature="dev", allow(enum_variant_names))]
 /// Semantic boolean for when a seal/signature is included.
 pub enum Seal {
 	/// The seal/signature is included.
diff --git a/ethcore/src/block.rs b/ethcore/src/block.rs
index b3894db94..9ecd58e0a 100644
--- a/ethcore/src/block.rs
+++ b/ethcore/src/block.rs
@@ -16,7 +16,7 @@
 
 //! Blockchain block.
 
-#![cfg_attr(all(nightly, feature="dev"), allow(ptr_arg))] // Because of &LastHashes -> &Vec<_>
+#![cfg_attr(feature="dev", allow(ptr_arg))] // Because of &LastHashes -> &Vec<_>
 
 use common::*;
 use engine::*;
diff --git a/ethcore/src/block_queue.rs b/ethcore/src/block_queue.rs
index 4e335f705..8250b261f 100644
--- a/ethcore/src/block_queue.rs
+++ b/ethcore/src/block_queue.rs
@@ -121,7 +121,7 @@ struct QueueSignal {
 }
 
 impl QueueSignal {
-	#[cfg_attr(all(nightly, feature="dev"), allow(bool_comparison))]
+	#[cfg_attr(feature="dev", allow(bool_comparison))]
 	fn set(&self) {
 		if self.signalled.compare_and_swap(false, true, AtomicOrdering::Relaxed) == false {
 			self.message_channel.send(UserMessage(SyncMessage::BlockVerified)).expect("Error sending BlockVerified message");
diff --git a/ethcore/src/blockchain/blockchain.rs b/ethcore/src/blockchain/blockchain.rs
index 4ebd111d9..36db9dded 100644
--- a/ethcore/src/blockchain/blockchain.rs
+++ b/ethcore/src/blockchain/blockchain.rs
@@ -907,7 +907,7 @@ mod tests {
 	}
 
 	#[test]
-	#[cfg_attr(all(nightly, feature="dev"), allow(cyclomatic_complexity))]
+	#[cfg_attr(feature="dev", allow(cyclomatic_complexity))]
 	fn test_find_uncles() {
 		let mut canon_chain = ChainGenerator::default();
 		let mut finalizer = BlockFinalizer::default();
@@ -945,7 +945,7 @@ mod tests {
 	}
 
 	#[test]
-	#[cfg_attr(all(nightly, feature="dev"), allow(cyclomatic_complexity))]
+	#[cfg_attr(feature="dev", allow(cyclomatic_complexity))]
 	fn test_small_fork() {
 		let mut canon_chain = ChainGenerator::default();
 		let mut finalizer = BlockFinalizer::default();
diff --git a/ethcore/src/ethereum/ethash.rs b/ethcore/src/ethereum/ethash.rs
index b0c0e4a9f..f9810b964 100644
--- a/ethcore/src/ethereum/ethash.rs
+++ b/ethcore/src/ethereum/ethash.rs
@@ -202,7 +202,7 @@ impl Engine for Ethash {
 	}
 }
 
-#[cfg_attr(all(nightly, feature="dev"), allow(wrong_self_convention))] // to_ethash should take self
+#[cfg_attr(feature="dev", allow(wrong_self_convention))] // to_ethash should take self
 impl Ethash {
 	fn calculate_difficuty(&self, header: &Header, parent: &Header) -> U256 {
 		const EXP_DIFF_PERIOD: u64 = 100000;
diff --git a/ethcore/src/evm/interpreter.rs b/ethcore/src/evm/interpreter.rs
index fb8d19357..7491321cb 100644
--- a/ethcore/src/evm/interpreter.rs
+++ b/ethcore/src/evm/interpreter.rs
@@ -243,7 +243,7 @@ struct CodeReader<'a> {
 	code: &'a Bytes
 }
 
-#[cfg_attr(all(nightly, feature="dev"), allow(len_without_is_empty))]
+#[cfg_attr(feature="dev", allow(len_without_is_empty))]
 impl<'a> CodeReader<'a> {
 	/// Get `no_of_bytes` from code and convert to U256. Move PC
 	fn read(&mut self, no_of_bytes: usize) -> U256 {
@@ -258,7 +258,7 @@ impl<'a> CodeReader<'a> {
 	}
 }
 
-#[cfg_attr(all(nightly, feature="dev"), allow(enum_variant_names))]
+#[cfg_attr(feature="dev", allow(enum_variant_names))]
 enum InstructionCost {
 	Gas(U256),
 	GasMem(U256, U256),
@@ -347,7 +347,7 @@ impl evm::Evm for Interpreter {
 }
 
 impl Interpreter {
-	#[cfg_attr(all(nightly, feature="dev"), allow(cyclomatic_complexity))]
+	#[cfg_attr(feature="dev", allow(cyclomatic_complexity))]
 	fn get_gas_cost_mem(&self,
 						ext: &evm::Ext,
 						instruction: Instruction,
diff --git a/ethcore/src/externalities.rs b/ethcore/src/externalities.rs
index a1f5763ea..598921580 100644
--- a/ethcore/src/externalities.rs
+++ b/ethcore/src/externalities.rs
@@ -188,7 +188,7 @@ impl<'a> Ext for Externalities<'a> {
 		self.state.code(address).unwrap_or_else(|| vec![])
 	}
 
-	#[cfg_attr(all(nightly, feature="dev"), allow(match_ref_pats))]
+	#[cfg_attr(feature="dev", allow(match_ref_pats))]
 	fn ret(&mut self, gas: &U256, data: &[u8]) -> Result<U256, evm::Error> {
 		match &mut self.output {
 			&mut OutputPolicy::Return(BytesRef::Fixed(ref mut slice)) => unsafe {
diff --git a/ethcore/src/lib.rs b/ethcore/src/lib.rs
index 0ff5c1903..458a94476 100644
--- a/ethcore/src/lib.rs
+++ b/ethcore/src/lib.rs
@@ -15,16 +15,16 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 #![warn(missing_docs)]
-#![cfg_attr(all(nightly, feature="dev"), feature(plugin))]
-#![cfg_attr(all(nightly, feature="dev"), plugin(clippy))]
+#![cfg_attr(feature="dev", feature(plugin))]
+#![cfg_attr(feature="dev", plugin(clippy))]
 
 // Clippy config
 // TODO [todr] not really sure
-#![cfg_attr(all(nightly, feature="dev"), allow(needless_range_loop))]
+#![cfg_attr(feature="dev", allow(needless_range_loop))]
 // Shorter than if-else
-#![cfg_attr(all(nightly, feature="dev"), allow(match_bool))]
+#![cfg_attr(feature="dev", allow(match_bool))]
 // Keeps consistency (all lines with `.clone()`) and helpful when changing ref to non-ref.
-#![cfg_attr(all(nightly, feature="dev"), allow(clone_on_copy))]
+#![cfg_attr(feature="dev", allow(clone_on_copy))]
 
 //! Ethcore library
 //!
diff --git a/ethcore/src/service.rs b/ethcore/src/service.rs
index bd15ee501..6daf0d7b6 100644
--- a/ethcore/src/service.rs
+++ b/ethcore/src/service.rs
@@ -117,7 +117,7 @@ impl IoHandler<NetSyncMessage> for ClientIoHandler {
 		}
 	}
 
-	#[cfg_attr(all(nightly, feature="dev"), allow(single_match))]
+	#[cfg_attr(feature="dev", allow(single_match))]
 	fn message(&self, io: &IoContext<NetSyncMessage>, net_message: &NetSyncMessage) {
 		if let UserMessage(ref message) = *net_message {
 			match *message {
diff --git a/ethcore/src/spec.rs b/ethcore/src/spec.rs
index 774024351..2208350cc 100644
--- a/ethcore/src/spec.rs
+++ b/ethcore/src/spec.rs
@@ -99,7 +99,7 @@ pub struct Spec {
 	genesis_state: PodState,
 }
 
-#[cfg_attr(all(nightly, feature="dev"), allow(wrong_self_convention))] // because to_engine(self) should be to_engine(&self)
+#[cfg_attr(feature="dev", allow(wrong_self_convention))] // because to_engine(self) should be to_engine(&self)
 impl Spec {
 	/// Convert this object into a boxed Engine of the right underlying type.
 	// TODO avoid this hard-coded nastiness - use dynamic-linked plugin framework instead.
diff --git a/ethcore/src/state.rs b/ethcore/src/state.rs
index 7c1064abf..c13678c38 100644
--- a/ethcore/src/state.rs
+++ b/ethcore/src/state.rs
@@ -224,7 +224,7 @@ impl State {
 
 	/// Commit accounts to SecTrieDBMut. This is similar to cpp-ethereum's dev::eth::commit.
 	/// `accounts` is mutable because we may need to commit the code or storage and record that.
-	#[cfg_attr(all(nightly, feature="dev"), allow(match_ref_pats))]
+	#[cfg_attr(feature="dev", allow(match_ref_pats))]
 	pub fn commit_into(db: &mut HashDB, root: &mut H256, accounts: &mut HashMap<Address, Option<Account>>) {
 		// first, commit the sub trees.
 		// TODO: is this necessary or can we dispense with the `ref mut a` for just `a`?
diff --git a/ethcore/src/transaction.rs b/ethcore/src/transaction.rs
index 733e5ac6b..a51824494 100644
--- a/ethcore/src/transaction.rs
+++ b/ethcore/src/transaction.rs
@@ -80,7 +80,7 @@ impl Transaction {
 }
 
 impl FromJson for SignedTransaction {
-	#[cfg_attr(all(nightly, feature="dev"), allow(single_char_pattern))]
+	#[cfg_attr(feature="dev", allow(single_char_pattern))]
 	fn from_json(json: &Json) -> SignedTransaction {
 		let t = Transaction {
 			nonce: xjson!(&json["nonce"]),
diff --git a/hook.sh b/hook.sh
index 354fddd5d..9780541fe 100755
--- a/hook.sh
+++ b/hook.sh
@@ -1,3 +1,12 @@
 #!/bin/sh
-echo "#!/bin/sh\ncargo test -p ethash -p ethcore-util -p ethcore -p ethsync -p ethcore-rpc -p parity --features dev-clippy" > ./.git/hooks/pre-push
-chmod +x ./.git/hooks/pre-push
+FILE=./.git/hooks/pre-push
+echo "#!/bin/sh\n" > $FILE
+# Exit on any error
+echo "set -e" >> $FILE
+# Run release build
+echo "cargo build --release --features dev" >> $FILE
+# Build tests
+echo "cargo test --no-run --features dev \\" >> $FILE
+echo "	-p ethash -p ethcore-util -p ethcore -p ethsync -p ethcore-rpc -p parity" >> $FILE
+echo "" >> $FILE
+chmod +x $FILE
diff --git a/parity/main.rs b/parity/main.rs
index 5f6d50027..c89d2aae6 100644
--- a/parity/main.rs
+++ b/parity/main.rs
@@ -17,8 +17,8 @@
 //! Ethcore client application.
 
 #![warn(missing_docs)]
-#![cfg_attr(all(nightly, feature="dev"), feature(plugin))]
-#![cfg_attr(all(nightly, feature="dev"), plugin(clippy))]
+#![cfg_attr(feature="dev", feature(plugin))]
+#![cfg_attr(feature="dev", plugin(clippy))]
 extern crate docopt;
 extern crate rustc_serialize;
 extern crate ethcore_util as util;
@@ -295,7 +295,7 @@ impl Configuration {
 		}
 	}
 
-	#[cfg_attr(all(nightly, feature="dev"), allow(useless_format))]
+	#[cfg_attr(feature="dev", allow(useless_format))]
 	fn net_addresses(&self) -> (Option<SocketAddr>, Option<SocketAddr>) {
 		let mut listen_address = None;
 		let mut public_address = None;
diff --git a/rpc/Cargo.toml b/rpc/Cargo.toml
index 2ce430e51..f324aba10 100644
--- a/rpc/Cargo.toml
+++ b/rpc/Cargo.toml
@@ -26,9 +26,8 @@ serde_macros = { version = "0.7.0", optional = true }
 [build-dependencies]
 serde_codegen = { version = "0.7.0", optional = true }
 syntex = "0.29.0"
-rustc_version = "0.1"
 
 [features]
 default = ["serde_codegen"]
 nightly = ["serde_macros"]
-dev = ["ethcore/dev", "ethcore-util/dev", "ethsync/dev"]
+dev = ["clippy", "ethcore/dev", "ethcore-util/dev", "ethsync/dev"]
diff --git a/rpc/build.rs b/rpc/build.rs
index 3806f6fe5..659bc35eb 100644
--- a/rpc/build.rs
+++ b/rpc/build.rs
@@ -14,10 +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/>.
 
-extern crate rustc_version;
-
-use rustc_version::{version_meta, Channel};
-
 #[cfg(not(feature = "serde_macros"))]
 mod inner {
     extern crate syntex;
@@ -46,7 +42,4 @@ mod inner {
 
 fn main() {
     inner::main();
-	if let Channel::Nightly = version_meta().channel {
-		println!("cargo:rustc-cfg=nightly");
-	}
 }
diff --git a/sync/Cargo.toml b/sync/Cargo.toml
index 46baa8a83..0097cd47e 100644
--- a/sync/Cargo.toml
+++ b/sync/Cargo.toml
@@ -4,13 +4,9 @@ name = "ethsync"
 version = "0.9.99"
 license = "GPL-3.0"
 authors = ["Ethcore <admin@ethcore.io"]
-build = "build.rs"
 
 [lib]
 
-[build-dependencies]
-rustc_version = "0.1"
-
 [dependencies]
 ethcore-util = { path = "../util" }
 ethcore = { path = "../ethcore" }
@@ -25,4 +21,4 @@ rayon = "0.3.1"
 
 [features]
 default = []
-dev = ["ethcore/dev", "ethcore-util/dev"]
+dev = ["clippy", "ethcore/dev", "ethcore-util/dev"]
diff --git a/sync/build.rs b/sync/build.rs
deleted file mode 100644
index 41b9a1b3e..000000000
--- a/sync/build.rs
+++ /dev/null
@@ -1,25 +0,0 @@
-// Copyright 2015, 2016 Ethcore (UK) Ltd.
-// This file is part of Parity.
-
-// Parity is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-
-// Parity is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-
-// You should have received a copy of the GNU General Public License
-// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
-
-extern crate rustc_version;
-
-use rustc_version::{version_meta, Channel};
-
-fn main() {
-	if let Channel::Nightly = version_meta().channel {
-		println!("cargo:rustc-cfg=nightly");
-	}
-}
diff --git a/sync/src/chain.rs b/sync/src/chain.rs
index 5418950d0..43bee9a56 100644
--- a/sync/src/chain.rs
+++ b/sync/src/chain.rs
@@ -279,7 +279,7 @@ impl ChainSync {
 	}
 
 
-	#[cfg_attr(all(nightly, feature="dev"), allow(for_kv_map))] // Because it's not possible to get `values_mut()`
+	#[cfg_attr(feature="dev", allow(for_kv_map))] // Because it's not possible to get `values_mut()`
 	/// Rest sync. Clear all downloaded data but keep the queue
 	fn reset(&mut self) {
 		self.downloading_headers.clear();
@@ -347,7 +347,7 @@ impl ChainSync {
 		Ok(())
 	}
 
-	#[cfg_attr(all(nightly, feature="dev"), allow(cyclomatic_complexity))]
+	#[cfg_attr(feature="dev", allow(cyclomatic_complexity))]
 	/// Called by peer once it has new block headers during sync
 	fn on_peer_block_headers(&mut self, io: &mut SyncIo, peer_id: PeerId, r: &UntrustedRlp) -> Result<(), PacketDecodeError> {
 		self.reset_peer_asking(peer_id, PeerAsking::BlockHeaders);
@@ -474,7 +474,7 @@ impl ChainSync {
 	}
 
 	/// Called by peer once it has new block bodies
-	#[cfg_attr(all(nightly, feature="dev"), allow(cyclomatic_complexity))]
+	#[cfg_attr(feature="dev", allow(cyclomatic_complexity))]
 	fn on_peer_new_block(&mut self, io: &mut SyncIo, peer_id: PeerId, r: &UntrustedRlp) -> Result<(), PacketDecodeError> {
 		let block_rlp = try!(r.at(0));
 		let header_rlp = try!(block_rlp.at(0));
diff --git a/sync/src/lib.rs b/sync/src/lib.rs
index 3b79e5614..3ef4b4150 100644
--- a/sync/src/lib.rs
+++ b/sync/src/lib.rs
@@ -15,11 +15,11 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 #![warn(missing_docs)]
-#![cfg_attr(all(nightly, feature="dev"), feature(plugin))]
-#![cfg_attr(all(nightly, feature="dev"), plugin(clippy))]
+#![cfg_attr(feature="dev", feature(plugin))]
+#![cfg_attr(feature="dev", plugin(clippy))]
 
 // Keeps consistency (all lines with `.clone()`) and helpful when changing ref to non-ref.
-#![cfg_attr(all(nightly, feature="dev"), allow(clone_on_copy))]
+#![cfg_attr(feature="dev", allow(clone_on_copy))]
 
 //! Blockchain sync module
 //! Implements ethereum protocol version 63 as specified here:
diff --git a/sync/src/range_collection.rs b/sync/src/range_collection.rs
index 826a67121..664d7c7a3 100644
--- a/sync/src/range_collection.rs
+++ b/sync/src/range_collection.rs
@@ -42,7 +42,7 @@ pub trait RangeCollection<K, V> {
 	fn remove_head(&mut self, start: &K);
 	/// Remove all elements >= `start` in the range that contains `start`
 	fn remove_tail(&mut self, start: &K);
-	/// Remove all elements >= `start` 
+	/// Remove all elements >= `start`
 	fn remove_from(&mut self, start: &K);
 	/// Remove all elements >= `tail`
 	fn insert_item(&mut self, key: K, value: V);
@@ -231,7 +231,7 @@ impl<K, V> RangeCollection<K, V> for Vec<(K, Vec<V>)> where K: Ord + PartialEq +
 }
 
 #[test]
-#[cfg_attr(all(nightly, feature="dev"), allow(cyclomatic_complexity))]
+#[cfg_attr(feature="dev", allow(cyclomatic_complexity))]
 fn test_range() {
 	use std::cmp::{Ordering};
 
diff --git a/util/Cargo.toml b/util/Cargo.toml
index 0ce27ec2b..74e4d7226 100644
--- a/util/Cargo.toml
+++ b/util/Cargo.toml
@@ -40,8 +40,7 @@ chrono = "0.2"
 
 [features]
 default = []
-dev = []
+dev = ["clippy"]
 
 [build-dependencies]
 vergen = "*"
-rustc_version = "0.1"
diff --git a/util/bigint/src/uint.rs b/util/bigint/src/uint.rs
index 959df0944..32abdb5d5 100644
--- a/util/bigint/src/uint.rs
+++ b/util/bigint/src/uint.rs
@@ -1103,7 +1103,7 @@ macro_rules! construct_uint {
 			}
 		}
 
-		#[cfg_attr(all(nightly, feature="dev"), allow(derive_hash_xor_eq))] // We are pretty sure it's ok.
+		#[cfg_attr(feature="dev", allow(derive_hash_xor_eq))] // We are pretty sure it's ok.
 		impl Hash for $name {
 			fn hash<H>(&self, state: &mut H) where H: Hasher {
 				unsafe { state.write(::std::slice::from_raw_parts(self.0.as_ptr() as *mut u8, self.0.len() * 8)); }
@@ -1485,7 +1485,7 @@ mod tests {
 	}
 
 	#[test]
-	#[cfg_attr(all(nightly, feature="dev"), allow(eq_op))]
+	#[cfg_attr(feature="dev", allow(eq_op))]
 	pub fn uint256_comp_test() {
 		let small = U256([10u64, 0, 0, 0]);
 		let big = U256([0x8C8C3EE70C644118u64, 0x0209E7378231E632, 0, 0]);
@@ -2032,7 +2032,7 @@ mod tests {
 
 
 	#[test]
-	#[cfg_attr(all(nightly, feature="dev"), allow(cyclomatic_complexity))]
+	#[cfg_attr(feature="dev", allow(cyclomatic_complexity))]
 	fn u256_multi_full_mul() {
 		let result = U256([0, 0, 0, 0]).full_mul(U256([0, 0, 0, 0]));
 		assert_eq!(U512([0, 0, 0, 0, 0, 0, 0, 0]), result);
diff --git a/util/build.rs b/util/build.rs
index 0b9b233e0..b0b64a380 100644
--- a/util/build.rs
+++ b/util/build.rs
@@ -14,15 +14,10 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
-extern crate rustc_version;
 extern crate vergen;
 
 use vergen::*;
-use rustc_version::{version_meta, Channel};
 
 fn main() {
 	vergen(OutputFns::all()).unwrap();
-	if let Channel::Nightly = version_meta().channel {
-		println!("cargo:rustc-cfg=nightly");
-	}
 }
diff --git a/util/src/hash.rs b/util/src/hash.rs
index 4eb96b53e..73fa33b47 100644
--- a/util/src/hash.rs
+++ b/util/src/hash.rs
@@ -305,7 +305,7 @@ macro_rules! impl_hash {
 		}
 
 		impl Copy for $from {}
-		#[cfg_attr(all(nightly, feature="dev"), allow(expl_impl_clone_on_copy))]
+		#[cfg_attr(feature="dev", allow(expl_impl_clone_on_copy))]
 		impl Clone for $from {
 			fn clone(&self) -> $from {
 				unsafe {
@@ -637,7 +637,7 @@ mod tests {
 	use std::str::FromStr;
 
 	#[test]
-	#[cfg_attr(all(nightly, feature="dev"), allow(eq_op))]
+	#[cfg_attr(feature="dev", allow(eq_op))]
 	fn hash() {
 		let h = H64([0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef]);
 		assert_eq!(H64::from_str("0123456789abcdef").unwrap(), h);
diff --git a/util/src/lib.rs b/util/src/lib.rs
index 59d66a325..a50ba8da4 100644
--- a/util/src/lib.rs
+++ b/util/src/lib.rs
@@ -15,18 +15,18 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 #![warn(missing_docs)]
-#![cfg_attr(all(nightly, feature="dev"), feature(plugin))]
-#![cfg_attr(all(nightly, feature="dev"), plugin(clippy))]
+#![cfg_attr(feature="dev", feature(plugin))]
+#![cfg_attr(feature="dev", plugin(clippy))]
 
 // Clippy settings
 // TODO [todr] not really sure
-#![cfg_attr(all(nightly, feature="dev"), allow(needless_range_loop))]
+#![cfg_attr(feature="dev", allow(needless_range_loop))]
 // Shorter than if-else
-#![cfg_attr(all(nightly, feature="dev"), allow(match_bool))]
+#![cfg_attr(feature="dev", allow(match_bool))]
 // We use that to be more explicit about handled cases
-#![cfg_attr(all(nightly, feature="dev"), allow(match_same_arms))]
+#![cfg_attr(feature="dev", allow(match_same_arms))]
 // Keeps consistency (all lines with `.clone()`) and helpful when changing ref to non-ref.
-#![cfg_attr(all(nightly, feature="dev"), allow(clone_on_copy))]
+#![cfg_attr(feature="dev", allow(clone_on_copy))]
 
 //! Ethcore-util library
 //!
diff --git a/util/src/network/discovery.rs b/util/src/network/discovery.rs
index 644af22af..4f3384894 100644
--- a/util/src/network/discovery.rs
+++ b/util/src/network/discovery.rs
@@ -243,7 +243,7 @@ impl Discovery {
 		self.send_to(packet, address.clone());
 	}
 
-	#[cfg_attr(all(nightly, feature="dev"), allow(map_clone))]
+	#[cfg_attr(feature="dev", allow(map_clone))]
 	fn nearest_node_entries(target: &NodeId, buckets: &[NodeBucket]) -> Vec<NodeEntry> {
 		let mut found: BTreeMap<u32, Vec<&NodeEntry>> = BTreeMap::new();
 		let mut count = 0;
diff --git a/util/src/network/host.rs b/util/src/network/host.rs
index 2d1af55ba..ece24a1d1 100644
--- a/util/src/network/host.rs
+++ b/util/src/network/host.rs
@@ -507,7 +507,7 @@ impl<Message> Host<Message> where Message: Send + Sync + Clone {
 		debug!(target: "network", "Connecting peers: {} sessions, {} pending", self.session_count(), self.handshake_count());
 	}
 
-	#[cfg_attr(all(nightly, feature="dev"), allow(single_match))]
+	#[cfg_attr(feature="dev", allow(single_match))]
 	fn connect_peer(&self, id: &NodeId, io: &IoContext<NetworkIoMessage<Message>>) {
 		if self.have_session(id)
 		{
@@ -542,7 +542,7 @@ impl<Message> Host<Message> where Message: Send + Sync + Clone {
 		self.create_connection(socket, Some(id), io);
 	}
 
-	#[cfg_attr(all(nightly, feature="dev"), allow(block_in_if_condition_stmt))]
+	#[cfg_attr(feature="dev", allow(block_in_if_condition_stmt))]
 	fn create_connection(&self, socket: TcpStream, id: Option<&NodeId>, io: &IoContext<NetworkIoMessage<Message>>) {
 		let nonce = self.info.write().unwrap().next_nonce();
 		let mut handshakes = self.handshakes.write().unwrap();
diff --git a/util/src/panics.rs b/util/src/panics.rs
index 70ce0bc33..05d266b8b 100644
--- a/util/src/panics.rs
+++ b/util/src/panics.rs
@@ -71,7 +71,7 @@ impl PanicHandler {
 
 	/// Invoke closure and catch any possible panics.
 	/// In case of panic notifies all listeners about it.
-	#[cfg_attr(all(nightly, feature="dev"), allow(deprecated))]
+	#[cfg_attr(feature="dev", allow(deprecated))]
 	pub fn catch_panic<G, R>(&self, g: G) -> thread::Result<R> where G: FnOnce() -> R + Send + 'static {
 		let _guard = PanicGuard { handler: self };
 		let result = g();
diff --git a/util/src/trie/triedb.rs b/util/src/trie/triedb.rs
index 182b87063..06076d273 100644
--- a/util/src/trie/triedb.rs
+++ b/util/src/trie/triedb.rs
@@ -54,7 +54,7 @@ pub struct TrieDB<'db> {
 	pub hash_count: usize,
 }
 
-#[cfg_attr(all(nightly, feature="dev"), allow(wrong_self_convention))]
+#[cfg_attr(feature="dev", allow(wrong_self_convention))]
 impl<'db> TrieDB<'db> {
 	/// Create a new trie with the backing database `db` and `root`
 	/// Panics, if `root` does not exist
diff --git a/util/src/trie/triedbmut.rs b/util/src/trie/triedbmut.rs
index 3d5c366e5..3d75fa3e1 100644
--- a/util/src/trie/triedbmut.rs
+++ b/util/src/trie/triedbmut.rs
@@ -66,7 +66,7 @@ enum MaybeChanged<'a> {
 	Changed(Bytes),
 }
 
-#[cfg_attr(all(nightly, feature="dev"), allow(wrong_self_convention))]
+#[cfg_attr(feature="dev", allow(wrong_self_convention))]
 impl<'db> TrieDBMut<'db> {
 	/// Create a new trie with the backing database `db` and empty `root`
 	/// Initialise to the state entailed by the genesis block.
@@ -350,7 +350,7 @@ impl<'db> TrieDBMut<'db> {
 		}
 	}
 
-	#[cfg_attr(all(nightly, feature="dev"), allow(cyclomatic_complexity))]
+	#[cfg_attr(feature="dev", allow(cyclomatic_complexity))]
 	/// Determine the RLP of the node, assuming we're inserting `partial` into the
 	/// node currently of data `old`. This will *not* delete any hash of `old` from the database;
 	/// it will just return the new RLP that includes the new node.