diff --git a/Cargo.lock b/Cargo.lock
index e5d1ff228f551..875610ebe07e5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -308,7 +308,7 @@ dependencies = [
  "demo-runtime 0.1.0",
  "ed25519 0.1.0",
  "env_logger 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -443,7 +443,7 @@ version = "0.1.0"
 
 [[package]]
 name = "error-chain"
-version = "0.11.0"
+version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "backtrace 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -474,12 +474,12 @@ dependencies = [
 [[package]]
 name = "ethcore-bytes"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/parity.git#93054ef24b590a8d854cd6b2d1de6567667d39da"
+source = "git+https://github.com/paritytech/parity.git#4145be863bec10038fc0ac5d36a41365b5087344"
 
 [[package]]
 name = "ethcore-crypto"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/parity.git#93054ef24b590a8d854cd6b2d1de6567667d39da"
+source = "git+https://github.com/paritytech/parity.git#4145be863bec10038fc0ac5d36a41365b5087344"
 dependencies = [
  "ethereum-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -491,7 +491,7 @@ dependencies = [
 [[package]]
 name = "ethcore-io"
 version = "1.12.0"
-source = "git+https://github.com/paritytech/parity.git#93054ef24b590a8d854cd6b2d1de6567667d39da"
+source = "git+https://github.com/paritytech/parity.git#4145be863bec10038fc0ac5d36a41365b5087344"
 dependencies = [
  "crossbeam 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -507,7 +507,7 @@ dependencies = [
 [[package]]
 name = "ethcore-logger"
 version = "1.12.0"
-source = "git+https://github.com/paritytech/parity.git#93054ef24b590a8d854cd6b2d1de6567667d39da"
+source = "git+https://github.com/paritytech/parity.git#4145be863bec10038fc0ac5d36a41365b5087344"
 dependencies = [
  "ansi_term 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -523,14 +523,15 @@ dependencies = [
 [[package]]
 name = "ethcore-network"
 version = "1.12.0"
-source = "git+https://github.com/paritytech/parity.git#93054ef24b590a8d854cd6b2d1de6567667d39da"
+source = "git+https://github.com/paritytech/parity.git#4145be863bec10038fc0ac5d36a41365b5087344"
 dependencies = [
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethcore-crypto 0.1.0 (git+https://github.com/paritytech/parity.git)",
  "ethcore-io 1.12.0 (git+https://github.com/paritytech/parity.git)",
  "ethereum-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethkey 0.3.0 (git+https://github.com/paritytech/parity.git)",
  "ipnetwork 0.12.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
  "rlp 0.2.1 (git+https://github.com/paritytech/parity.git)",
  "snappy 0.1.0 (git+https://github.com/paritytech/rust-snappy)",
 ]
@@ -538,11 +539,11 @@ dependencies = [
 [[package]]
 name = "ethcore-network-devp2p"
 version = "1.12.0"
-source = "git+https://github.com/paritytech/parity.git#93054ef24b590a8d854cd6b2d1de6567667d39da"
+source = "git+https://github.com/paritytech/parity.git#4145be863bec10038fc0ac5d36a41365b5087344"
 dependencies = [
  "ansi_term 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "bytes 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethcore-bytes 0.1.0 (git+https://github.com/paritytech/parity.git)",
  "ethcore-crypto 0.1.0 (git+https://github.com/paritytech/parity.git)",
  "ethcore-io 1.12.0 (git+https://github.com/paritytech/parity.git)",
@@ -595,7 +596,7 @@ dependencies = [
 [[package]]
 name = "ethkey"
 version = "0.3.0"
-source = "git+https://github.com/paritytech/parity.git#93054ef24b590a8d854cd6b2d1de6567667d39da"
+source = "git+https://github.com/paritytech/parity.git#4145be863bec10038fc0ac5d36a41365b5087344"
 dependencies = [
  "byteorder 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "edit-distance 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -609,6 +610,8 @@ dependencies = [
  "quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
  "tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -667,6 +670,15 @@ name = "foreign-types-shared"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "fs-swap"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "fuchsia-zircon"
 version = "0.3.3"
@@ -720,7 +732,7 @@ dependencies = [
 [[package]]
 name = "hashdb"
 version = "0.1.1"
-source = "git+https://github.com/paritytech/parity.git#93054ef24b590a8d854cd6b2d1de6567667d39da"
+source = "git+https://github.com/paritytech/parity.git#4145be863bec10038fc0ac5d36a41365b5087344"
 dependencies = [
  "elastic-array 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethereum-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -871,7 +883,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "jsonrpc-core"
 version = "8.0.2"
-source = "git+https://github.com/paritytech/jsonrpc.git#3e358b48b71bf90dc60b4099de47e65b030dc319"
+source = "git+https://github.com/paritytech/jsonrpc.git#ecbd6197e562098a3a9db6e485255026f13b4329"
 dependencies = [
  "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -883,7 +895,7 @@ dependencies = [
 [[package]]
 name = "jsonrpc-http-server"
 version = "8.0.1"
-source = "git+https://github.com/paritytech/jsonrpc.git#3e358b48b71bf90dc60b4099de47e65b030dc319"
+source = "git+https://github.com/paritytech/jsonrpc.git#ecbd6197e562098a3a9db6e485255026f13b4329"
 dependencies = [
  "hyper 0.11.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "jsonrpc-core 8.0.2 (git+https://github.com/paritytech/jsonrpc.git)",
@@ -896,7 +908,7 @@ dependencies = [
 [[package]]
 name = "jsonrpc-macros"
 version = "8.0.1"
-source = "git+https://github.com/paritytech/jsonrpc.git#3e358b48b71bf90dc60b4099de47e65b030dc319"
+source = "git+https://github.com/paritytech/jsonrpc.git#ecbd6197e562098a3a9db6e485255026f13b4329"
 dependencies = [
  "jsonrpc-core 8.0.2 (git+https://github.com/paritytech/jsonrpc.git)",
  "jsonrpc-pubsub 8.0.1 (git+https://github.com/paritytech/jsonrpc.git)",
@@ -906,17 +918,17 @@ dependencies = [
 [[package]]
 name = "jsonrpc-pubsub"
 version = "8.0.1"
-source = "git+https://github.com/paritytech/jsonrpc.git#3e358b48b71bf90dc60b4099de47e65b030dc319"
+source = "git+https://github.com/paritytech/jsonrpc.git#ecbd6197e562098a3a9db6e485255026f13b4329"
 dependencies = [
  "jsonrpc-core 8.0.2 (git+https://github.com/paritytech/jsonrpc.git)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "jsonrpc-server-utils"
 version = "8.0.1"
-source = "git+https://github.com/paritytech/jsonrpc.git#3e358b48b71bf90dc60b4099de47e65b030dc319"
+source = "git+https://github.com/paritytech/jsonrpc.git#ecbd6197e562098a3a9db6e485255026f13b4329"
 dependencies = [
  "bytes 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "globset 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -929,13 +941,13 @@ dependencies = [
 [[package]]
 name = "jsonrpc-ws-server"
 version = "8.0.0"
-source = "git+https://github.com/paritytech/jsonrpc.git#3e358b48b71bf90dc60b4099de47e65b030dc319"
+source = "git+https://github.com/paritytech/jsonrpc.git#ecbd6197e562098a3a9db6e485255026f13b4329"
 dependencies = [
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "jsonrpc-core 8.0.2 (git+https://github.com/paritytech/jsonrpc.git)",
  "jsonrpc-server-utils 8.0.1 (git+https://github.com/paritytech/jsonrpc.git)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ws 0.7.5 (git+https://github.com/tomusdrw/ws-rs)",
 ]
@@ -953,7 +965,7 @@ dependencies = [
 [[package]]
 name = "keccak-hash"
 version = "0.1.2"
-source = "git+https://github.com/paritytech/parity.git#93054ef24b590a8d854cd6b2d1de6567667d39da"
+source = "git+https://github.com/paritytech/parity.git#4145be863bec10038fc0ac5d36a41365b5087344"
 dependencies = [
  "ethereum-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -971,17 +983,17 @@ dependencies = [
 [[package]]
 name = "kvdb"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/parity.git#93054ef24b590a8d854cd6b2d1de6567667d39da"
+source = "git+https://github.com/paritytech/parity.git#4145be863bec10038fc0ac5d36a41365b5087344"
 dependencies = [
  "elastic-array 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethcore-bytes 0.1.0 (git+https://github.com/paritytech/parity.git)",
 ]
 
 [[package]]
 name = "kvdb-memorydb"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/parity.git#93054ef24b590a8d854cd6b2d1de6567667d39da"
+source = "git+https://github.com/paritytech/parity.git#4145be863bec10038fc0ac5d36a41365b5087344"
 dependencies = [
  "kvdb 0.1.0 (git+https://github.com/paritytech/parity.git)",
  "parking_lot 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -990,10 +1002,11 @@ dependencies = [
 [[package]]
 name = "kvdb-rocksdb"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/parity.git#93054ef24b590a8d854cd6b2d1de6567667d39da"
+source = "git+https://github.com/paritytech/parity.git#4145be863bec10038fc0ac5d36a41365b5087344"
 dependencies = [
  "elastic-array 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethereum-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fs-swap 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "interleaved-ordered 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "kvdb 0.1.0 (git+https://github.com/paritytech/parity.git)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1043,6 +1056,15 @@ dependencies = [
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "lock_api"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "owning_ref 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "log"
 version = "0.3.9"
@@ -1067,7 +1089,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "mem"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/parity.git#93054ef24b590a8d854cd6b2d1de6567667d39da"
+source = "git+https://github.com/paritytech/parity.git#4145be863bec10038fc0ac5d36a41365b5087344"
 
 [[package]]
 name = "memchr"
@@ -1090,7 +1112,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "memorydb"
 version = "0.1.1"
-source = "git+https://github.com/paritytech/parity.git#93054ef24b590a8d854cd6b2d1de6567667d39da"
+source = "git+https://github.com/paritytech/parity.git#4145be863bec10038fc0ac5d36a41365b5087344"
 dependencies = [
  "elastic-array 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethereum-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1282,6 +1304,15 @@ dependencies = [
  "parking_lot_core 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "parking_lot"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lock_api 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot_core 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "parking_lot_core"
 version = "0.2.14"
@@ -1296,12 +1327,12 @@ dependencies = [
 [[package]]
 name = "path"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/parity.git#93054ef24b590a8d854cd6b2d1de6567667d39da"
+source = "git+https://github.com/paritytech/parity.git#4145be863bec10038fc0ac5d36a41365b5087344"
 
 [[package]]
 name = "patricia-trie"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/parity.git#93054ef24b590a8d854cd6b2d1de6567667d39da"
+source = "git+https://github.com/paritytech/parity.git#4145be863bec10038fc0ac5d36a41365b5087344"
 dependencies = [
  "elastic-array 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethcore-bytes 0.1.0 (git+https://github.com/paritytech/parity.git)",
@@ -1329,7 +1360,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "plain_hasher"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/parity.git#93054ef24b590a8d854cd6b2d1de6567667d39da"
+source = "git+https://github.com/paritytech/parity.git#4145be863bec10038fc0ac5d36a41365b5087344"
 dependencies = [
  "crunchy 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethereum-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1339,7 +1370,7 @@ dependencies = [
 name = "polkadot"
 version = "0.2.0"
 dependencies = [
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "polkadot-cli 0.2.0",
 ]
 
@@ -1347,7 +1378,7 @@ dependencies = [
 name = "polkadot-api"
 version = "0.1.0"
 dependencies = [
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "polkadot-executor 0.1.0",
  "polkadot-primitives 0.1.0",
  "polkadot-runtime 0.1.0",
@@ -1373,7 +1404,7 @@ dependencies = [
  "ctrlc 1.1.1 (git+https://github.com/paritytech/rust-ctrlc.git)",
  "ed25519 0.1.0",
  "env_logger 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "fdlimit 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1418,7 +1449,7 @@ name = "polkadot-consensus"
 version = "0.1.0"
 dependencies = [
  "ed25519 0.1.0",
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "exit-future 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1453,7 +1484,7 @@ dependencies = [
 name = "polkadot-parachain"
 version = "0.1.0"
 dependencies = [
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "substrate-codec 0.1.0",
  "tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasmi 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1508,7 +1539,7 @@ version = "0.2.0"
 dependencies = [
  "clap 2.31.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "ed25519 0.1.0",
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "exit-future 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1549,7 +1580,7 @@ name = "polkadot-transaction-pool"
 version = "0.1.0"
 dependencies = [
  "ed25519 0.1.0",
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "polkadot-api 0.1.0",
@@ -1682,7 +1713,7 @@ dependencies = [
  "lazy_static 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1749,7 +1780,7 @@ dependencies = [
 [[package]]
 name = "rlp"
 version = "0.2.1"
-source = "git+https://github.com/paritytech/parity.git#93054ef24b590a8d854cd6b2d1de6567667d39da"
+source = "git+https://github.com/paritytech/parity.git#4145be863bec10038fc0ac5d36a41365b5087344"
 dependencies = [
  "byteorder 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "elastic-array 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2049,7 +2080,7 @@ name = "substrate-bft"
 version = "0.1.0"
 dependencies = [
  "ed25519 0.1.0",
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2068,7 +2099,7 @@ name = "substrate-client"
 version = "0.1.0"
 dependencies = [
  "ed25519 0.1.0",
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2121,7 +2152,7 @@ dependencies = [
  "assert_matches 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "ed25519 0.1.0",
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2141,11 +2172,11 @@ dependencies = [
 name = "substrate-extrinsic-pool"
 version = "0.1.0"
 dependencies = [
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "transaction-pool 1.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "transaction-pool 1.12.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2162,7 +2193,7 @@ name = "substrate-keystore"
 version = "0.1.0"
 dependencies = [
  "ed25519 0.1.0",
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethcore-crypto 0.1.0 (git+https://github.com/paritytech/parity.git)",
  "hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2192,7 +2223,7 @@ dependencies = [
  "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "ed25519 0.1.0",
  "env_logger 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethcore-io 1.12.0 (git+https://github.com/paritytech/parity.git)",
  "ethcore-network 1.12.0 (git+https://github.com/paritytech/parity.git)",
  "ethcore-network-devp2p 1.12.0 (git+https://github.com/paritytech/parity.git)",
@@ -2241,7 +2272,7 @@ name = "substrate-rpc"
 version = "0.1.0"
 dependencies = [
  "assert_matches 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "jsonrpc-core 8.0.2 (git+https://github.com/paritytech/jsonrpc.git)",
  "jsonrpc-macros 8.0.1 (git+https://github.com/paritytech/jsonrpc.git)",
  "jsonrpc-pubsub 8.0.1 (git+https://github.com/paritytech/jsonrpc.git)",
@@ -2855,10 +2886,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "transaction-pool"
-version = "1.12.0"
+version = "1.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "trace-time 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2867,7 +2898,7 @@ dependencies = [
 [[package]]
 name = "triehash"
 version = "0.1.0"
-source = "git+https://github.com/paritytech/parity.git#93054ef24b590a8d854cd6b2d1de6567667d39da"
+source = "git+https://github.com/paritytech/parity.git#4145be863bec10038fc0ac5d36a41365b5087344"
 dependencies = [
  "elastic-array 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethereum-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3203,7 +3234,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum either 1.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3be565ca5c557d7f59e7cfcf1844f9e3033650c929c6566f511e8005f205c1d0"
 "checksum elastic-array 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "88d4851b005ef16de812ea9acdb7bece2f0a40dd86c07b85631d7dafa54537bb"
 "checksum env_logger 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "3ddf21e73e016298f5cb37d6ef8e8da8e39f91f9ec8b0df44b7deb16a9f8cd5b"
-"checksum error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ff511d5dc435d703f4971bc399647c9bc38e20cb41452e3b9feb4765419ed3f3"
+"checksum error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "07e791d3be96241c77c43846b665ef1384606da2cd2a48730abe606a12906e02"
 "checksum eth-secp256k1 0.5.7 (git+https://github.com/paritytech/rust-secp256k1)" = "<none>"
 "checksum ethbloom 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1a93a43ce2e9f09071449da36bfa7a1b20b950ee344b6904ff23de493b03b386"
 "checksum ethcore-bytes 0.1.0 (git+https://github.com/paritytech/parity.git)" = "<none>"
@@ -3222,6 +3253,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "2fad85553e09a6f881f739c29f0b00b0f01357c743266d478b68951ce23285f3"
 "checksum foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f6f339eb8adc052cd2ca78910fda869aefa38d22d5cb648e6485e4d3fc06f3b1"
 "checksum foreign-types-shared 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "00b0228411908ca8685dba7fc2cdd70ec9990a6e753e89b6ac91a84c40fbaf4b"
+"checksum fs-swap 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "31a94e9407e53addc49de767234a0b000978523c59117e5badb575ccbb8370f6"
 "checksum fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "2e9763c69ebaae630ba35f74888db465e49e259ba1bc0eda7d06f4a067615d82"
 "checksum fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"
 "checksum futures 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)" = "1a70b146671de62ec8c8ed572219ca5d594d9b06c0b364d5e67b722fc559b48c"
@@ -3264,6 +3296,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)" = "ac8ebf8343a981e2fa97042b14768f02ed3e1d602eac06cae6166df3c8ced206"
 "checksum linked-hash-map 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "70fb39025bc7cdd76305867c4eccf2f2dcf6e9a57f5b21a93e1c2d86cd03ec9e"
 "checksum local-encoding 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e1ceb20f39ff7ae42f3ff9795f3986b1daad821caaa1e1732a0944103a5a1a66"
+"checksum lock_api 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "949826a5ccf18c1b3a7c3d57692778d21768b79e46eb9dd07bfc4c2160036c54"
 "checksum log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "e19e8d5c34a3e0e2223db8e060f9e8264aeeb5c5fc64a4ee9965c062211c024b"
 "checksum log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "89f010e843f2b1a31dbd316b3b8d443758bc634bed37aabade59c686d644e0a2"
 "checksum matches 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "100aabe6b8ff4e4a7e32c1c13523379802df0772b82466207ac25b013f193376"
@@ -3291,6 +3324,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum parity-wordlist 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1d0dec124478845b142f68b446cbee953d14d4b41f1bc0425024417720dce693"
 "checksum parking_lot 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)" = "149d8f5b97f3c1133e3cfcd8886449959e856b557ff281e292b733d7c69e005e"
 "checksum parking_lot 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)" = "d4d05f1349491390b1730afba60bb20d55761bef489a954546b58b4b34e1e2ac"
+"checksum parking_lot 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "901d6514273469bb17380c1ac3f51fb3ce54be1f960e51a6f04901eba313ab8d"
 "checksum parking_lot_core 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)" = "4db1a8ccf734a7bce794cc19b3df06ed87ab2f3907036b693c68f56b4d4537fa"
 "checksum path 0.1.0 (git+https://github.com/paritytech/parity.git)" = "<none>"
 "checksum patricia-trie 0.1.0 (git+https://github.com/paritytech/parity.git)" = "<none>"
@@ -3383,7 +3417,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum tokio-udp 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "137bda266504893ac4774e0ec4c2108f7ccdbcb7ac8dced6305fe9e4e0b5041a"
 "checksum trace-time 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5aea07da6582e957c6e737eeb63a5af79e648eeeaaaba8fd9a417f1124bafa41"
 "checksum traitobject 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "efd1f82c56340fdf16f2a953d7bda4f8fdffba13d93b00844c25572110b26079"
-"checksum transaction-pool 1.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "dd61073aadeb282056e97180e5d0dd9774413f954bd221c07692578dab466b26"
+"checksum transaction-pool 1.12.1 (registry+https://github.com/rust-lang/crates.io-index)" = "be1efb673ddf49ab4a99893eb3af02f6563636033fb832c2b7f937641ad62b17"
 "checksum triehash 0.1.0 (git+https://github.com/paritytech/parity.git)" = "<none>"
 "checksum triehash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "2033893a813c70e7d8a739ca6c36dc0a7a2c913ec718d7cbf84a3837bbe3c7ce"
 "checksum try-lock 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ee2aa4715743892880f70885373966c83d73ef1b0838a664ef0c76fffd35e7c2"
diff --git a/Cargo.toml b/Cargo.toml
index b1602fb3d270d..45acf2082adcd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,7 +8,7 @@ version = "0.2.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 
 [dependencies]
-error-chain = "0.11"
+error-chain = "0.12"
 polkadot-cli = { path = "polkadot/cli" }
 
 [workspace]
diff --git a/demo/cli/Cargo.toml b/demo/cli/Cargo.toml
index 6f488c2ad84e7..c1a0af349cc91 100644
--- a/demo/cli/Cargo.toml
+++ b/demo/cli/Cargo.toml
@@ -10,7 +10,7 @@ ctrlc = { git = "https://github.com/paritytech/rust-ctrlc.git" }
 ed25519 = { path = "../../substrate/ed25519" }
 env_logger = "0.4"
 futures = "0.1.17"
-error-chain = "0.11"
+error-chain = "0.12"
 hex-literal = "0.1"
 log = "0.3"
 tokio-core = "0.1.12"
diff --git a/polkadot/api/Cargo.toml b/polkadot/api/Cargo.toml
index 5a883cfd2cdff..7b5015b99130c 100644
--- a/polkadot/api/Cargo.toml
+++ b/polkadot/api/Cargo.toml
@@ -4,7 +4,7 @@ version = "0.1.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 
 [dependencies]
-error-chain = "0.11"
+error-chain = "0.12"
 polkadot-executor = { path = "../executor" }
 polkadot-runtime = { path = "../runtime" }
 polkadot-primitives = { path = "../primitives" }
diff --git a/polkadot/cli/Cargo.toml b/polkadot/cli/Cargo.toml
index 82e63d16b712c..48dd25ebc8b4f 100644
--- a/polkadot/cli/Cargo.toml
+++ b/polkadot/cli/Cargo.toml
@@ -7,7 +7,7 @@ description = "Polkadot node implementation in Rust."
 [dependencies]
 clap = { version = "2.27", features = ["yaml"] }
 env_logger = "0.4"
-error-chain = "0.11"
+error-chain = "0.12"
 log = "0.3"
 atty = "0.2"
 regex = "0.2"
diff --git a/polkadot/consensus/Cargo.toml b/polkadot/consensus/Cargo.toml
index 9941a21b33a7a..fefa67de45d22 100644
--- a/polkadot/consensus/Cargo.toml
+++ b/polkadot/consensus/Cargo.toml
@@ -8,7 +8,7 @@ futures = "0.1.17"
 parking_lot = "0.4"
 tokio-core = "0.1.12"
 ed25519 = { path = "../../substrate/ed25519" }
-error-chain = "0.11"
+error-chain = "0.12"
 log = "0.3"
 exit-future = "0.1"
 polkadot-api = { path = "../api" }
diff --git a/polkadot/parachain/Cargo.toml b/polkadot/parachain/Cargo.toml
index 47cde571e1567..9b46f3f1c2a0d 100644
--- a/polkadot/parachain/Cargo.toml
+++ b/polkadot/parachain/Cargo.toml
@@ -7,7 +7,7 @@ description = "Types and utilities for creating and working with parachains"
 [dependencies]
 substrate-codec = { path = "../../substrate/codec", default-features = false }
 wasmi = { version = "0.1", optional = true }
-error-chain = { version = "0.11", optional = true }
+error-chain = { version = "0.12", optional = true }
 
 [dev-dependencies]
 tiny-keccak = "1.4"
diff --git a/polkadot/service/Cargo.toml b/polkadot/service/Cargo.toml
index 86b4deea507fd..e8274f66b2408 100644
--- a/polkadot/service/Cargo.toml
+++ b/polkadot/service/Cargo.toml
@@ -7,7 +7,7 @@ authors = ["Parity Technologies <admin@parity.io>"]
 futures = "0.1.17"
 parking_lot = "0.4"
 tokio-timer = "0.1.2"
-error-chain = "0.11"
+error-chain = "0.12"
 lazy_static = "1.0"
 log = "0.3"
 slog = "^2"
diff --git a/polkadot/transaction-pool/Cargo.toml b/polkadot/transaction-pool/Cargo.toml
index 89fa3e88c03b2..588db7ef0b11d 100644
--- a/polkadot/transaction-pool/Cargo.toml
+++ b/polkadot/transaction-pool/Cargo.toml
@@ -5,7 +5,7 @@ authors = ["Parity Technologies <admin@parity.io>"]
 
 [dependencies]
 log = "0.3.0"
-error-chain = "0.11"
+error-chain = "0.12"
 parking_lot = "0.4"
 polkadot-api = { path = "../api" }
 polkadot-primitives = { path = "../primitives" }
diff --git a/substrate/bft/Cargo.toml b/substrate/bft/Cargo.toml
index 68179536b4330..cf6529dd373a0 100644
--- a/substrate/bft/Cargo.toml
+++ b/substrate/bft/Cargo.toml
@@ -12,7 +12,7 @@ substrate-runtime-primitives = { path = "../runtime/primitives" }
 ed25519 = { path = "../ed25519" }
 tokio-timer = "0.1.2"
 parking_lot = "0.4"
-error-chain = "0.11"
+error-chain = "0.12"
 log = "0.3"
 
 [dev-dependencies]
diff --git a/substrate/client/Cargo.toml b/substrate/client/Cargo.toml
index 7455c51942165..d28da71a474af 100644
--- a/substrate/client/Cargo.toml
+++ b/substrate/client/Cargo.toml
@@ -4,7 +4,7 @@ version = "0.1.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 
 [dependencies]
-error-chain = "0.11"
+error-chain = "0.12"
 log = "0.3"
 parking_lot = "0.4"
 triehash = "0.1"
diff --git a/substrate/executor/Cargo.toml b/substrate/executor/Cargo.toml
index 47ad4ee1697c0..58152c27a9309 100644
--- a/substrate/executor/Cargo.toml
+++ b/substrate/executor/Cargo.toml
@@ -4,7 +4,7 @@ version = "0.1.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 
 [dependencies]
-error-chain = "0.11"
+error-chain = "0.12"
 substrate-codec = { path = "../codec" }
 substrate-runtime-io = { path = "../runtime-io" }
 substrate-primitives = { path = "../primitives" }
diff --git a/substrate/extrinsic-pool/Cargo.toml b/substrate/extrinsic-pool/Cargo.toml
index 88f639117b286..636fc60e19341 100644
--- a/substrate/extrinsic-pool/Cargo.toml
+++ b/substrate/extrinsic-pool/Cargo.toml
@@ -4,7 +4,7 @@ version = "0.1.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 
 [dependencies]
-error-chain = "0.11"
+error-chain = "0.12"
 futures = "0.1"
 log = "0.3"
 parking_lot = "0.4"
diff --git a/substrate/keystore/Cargo.toml b/substrate/keystore/Cargo.toml
index 18b0f3a33ec54..88ec623f34d4d 100644
--- a/substrate/keystore/Cargo.toml
+++ b/substrate/keystore/Cargo.toml
@@ -6,7 +6,7 @@ authors = ["Parity Technologies <admin@parity.io>"]
 [dependencies]
 ethcore-crypto = { git = "https://github.com/paritytech/parity.git", default_features = false }
 ed25519 = { path = "../ed25519" }
-error-chain = "0.11"
+error-chain = "0.12"
 hex = "0.3"
 rand = "0.4"
 serde_json = "1.0"
diff --git a/substrate/keystore/src/lib.rs b/substrate/keystore/src/lib.rs
index 77aeb16ae1a80..97210b29ef015 100644
--- a/substrate/keystore/src/lib.rs
+++ b/substrate/keystore/src/lib.rs
@@ -84,7 +84,7 @@ impl EncryptedKey {
 
 		// two parts of derived key
 		// DK = [ DK[0..15] DK[16..31] ] = [derived_left_bits, derived_right_bits]
-		let (derived_left_bits, derived_right_bits) = crypto::derive_key_iterations(password, &salt, iterations);
+		let (derived_left_bits, derived_right_bits) = crypto::derive_key_iterations(password.as_bytes(), &salt, iterations);
 
 		// preallocated (on-stack in case of `Secret`) buffer to hold cipher
 		// length = length(plain) as we are using CTR-approach
@@ -108,7 +108,7 @@ impl EncryptedKey {
 
 	fn decrypt(&self, password: &str) -> Result<[u8; PKCS_LEN]> {
 		let (derived_left_bits, derived_right_bits) =
-			crypto::derive_key_iterations(password, &self.salt, self.iterations);
+			crypto::derive_key_iterations(password.as_bytes(), &self.salt, self.iterations);
 
 		let mac = crypto::derive_mac(&derived_right_bits, &self.ciphertext).keccak256();
 
diff --git a/substrate/network/Cargo.toml b/substrate/network/Cargo.toml
index dd5011953a47f..bd132992f8971 100644
--- a/substrate/network/Cargo.toml
+++ b/substrate/network/Cargo.toml
@@ -11,7 +11,7 @@ authors = ["Parity Technologies <admin@parity.io>"]
 log = "0.3"
 rand = "0.3"
 parking_lot = "0.4"
-error-chain = "0.11"
+error-chain = "0.12"
 bitflags = "1.0"
 serde = "1.0"
 serde_derive = "1.0"
diff --git a/substrate/network/src/service.rs b/substrate/network/src/service.rs
index 06af3c52cc7ad..f26e31337da74 100644
--- a/substrate/network/src/service.rs
+++ b/substrate/network/src/service.rs
@@ -19,7 +19,7 @@ use std::sync::Arc;
 use std::io;
 use std::time::Duration;
 use futures::sync::{oneshot, mpsc};
-use network::{NetworkProtocolHandler, NetworkContext, HostInfo, PeerId, ProtocolId,
+use network::{NetworkProtocolHandler, NetworkContext, PeerId, ProtocolId,
 NetworkConfiguration , NonReservedPeerMode, ErrorKind};
 use network_devp2p::{NetworkService};
 use core_io::{TimerToken};
@@ -175,9 +175,9 @@ impl<B: BlockT + 'static> Service<B> where B::Header: HeaderT<Number=u64> {
 	}
 
 	fn start(&self) {
-		match self.network.start().map_err(Into::into) {
+		match self.network.start().map_err(|e| e.0.into()) {
 			Err(ErrorKind::Io(ref e)) if  e.kind() == io::ErrorKind::AddrInUse =>
-				warn!("Network port {:?} is already in use, make sure that another instance of Polkadot client is not running or change the port using the --port option.", self.network.config().listen_address.expect("Listen address is not set.")),
+				warn!("Network port is already in use, make sure that another instance of Polkadot client is not running or change the port using the --port option."),
 			Err(err) => warn!("Error starting network: {}", err),
 			_ => {},
 		};
@@ -257,7 +257,7 @@ impl<B: BlockT + 'static> ConsensusService<B> for Service<B> where B::Header: He
 }
 
 impl<B: BlockT + 'static> NetworkProtocolHandler for ProtocolHandler<B> where B::Header: HeaderT<Number=u64> {
-	fn initialize(&self, io: &NetworkContext, _host_info: &HostInfo) {
+	fn initialize(&self, io: &NetworkContext) {
 		io.register_timer(TICK_TOKEN, TICK_TIMEOUT)
 			.expect("Error registering sync timer");
 
diff --git a/substrate/rpc/Cargo.toml b/substrate/rpc/Cargo.toml
index 45bddecdfdf5d..fb8bea65a9054 100644
--- a/substrate/rpc/Cargo.toml
+++ b/substrate/rpc/Cargo.toml
@@ -4,7 +4,7 @@ version = "0.1.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 
 [dependencies]
-error-chain = "0.11"
+error-chain = "0.12"
 jsonrpc-core = { git="https://github.com/paritytech/jsonrpc.git" }
 jsonrpc-macros = { git="https://github.com/paritytech/jsonrpc.git" }
 jsonrpc-pubsub = { git="https://github.com/paritytech/jsonrpc.git" }