diff --git a/Cargo.lock b/Cargo.lock
index 63597b890..ee6ce5e2a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -338,7 +338,7 @@ version = "0.5.6"
 source = "git+https://github.com/paritytech/rust-secp256k1#b6b67055edc929057e97d64f036c78ad91f58a7f"
 dependencies = [
  "arrayvec 0.3.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "gcc 0.3.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gcc 0.3.51 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -814,7 +814,7 @@ version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
- "miniz-sys 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "miniz-sys 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -844,10 +844,10 @@ dependencies = [
 
 [[package]]
 name = "gcc"
-version = "0.3.43"
+version = "0.3.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "rayon 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rayon 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -920,7 +920,7 @@ name = "hidapi"
 version = "0.3.1"
 source = "git+https://github.com/paritytech/hidapi-rs#9a127c1dca7e327e4fdd428406a76c9f5ef48563"
 dependencies = [
- "gcc 0.3.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gcc 0.3.51 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1204,7 +1204,7 @@ name = "libusb-sys"
 version = "0.2.3"
 source = "git+https://github.com/paritytech/libusb-sys#c10b1180646c9dc3f23a9b6bb825abcd3b7487ce"
 dependencies = [
- "gcc 0.3.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gcc 0.3.51 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1275,10 +1275,10 @@ dependencies = [
 
 [[package]]
 name = "miniz-sys"
-version = "0.1.7"
+version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "gcc 0.3.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gcc 0.3.51 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1383,7 +1383,7 @@ name = "nanomsg-sys"
 version = "0.5.0"
 source = "git+https://github.com/paritytech/nanomsg.rs.git?branch=parity-1.7#673b79beef6e149273899850d7692335a481a920"
 dependencies = [
- "gcc 0.3.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gcc 0.3.51 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1556,7 +1556,7 @@ name = "openssl-sys"
 version = "0.9.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "gcc 0.3.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gcc 0.3.51 (registry+https://github.com/rust-lang/crates.io-index)",
  "gdi32-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2046,17 +2046,6 @@ dependencies = [
  "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "rayon"
-version = "0.6.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "deque 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
- "num_cpus 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "rayon"
 version = "0.7.0"
@@ -2118,7 +2107,7 @@ name = "ring"
 version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "gcc 0.3.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gcc 0.3.51 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "rayon 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2151,7 +2140,7 @@ name = "rocksdb-sys"
 version = "0.3.0"
 source = "git+https://github.com/paritytech/rust-rocksdb#4364caec4dd5da1a1d78c39276774ee65bf55c7d"
 dependencies = [
- "gcc 0.3.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gcc 0.3.51 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2206,7 +2195,7 @@ name = "rust-crypto"
 version = "0.2.36"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "gcc 0.3.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gcc 0.3.51 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2386,7 +2375,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "sha3"
 version = "0.1.0"
 dependencies = [
- "gcc 0.3.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gcc 0.3.51 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2961,7 +2950,7 @@ dependencies = [
 "checksum foreign-types 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3e4056b9bd47f8ac5ba12be771f77a0dae796d1bbaaf5fd0b9c2d38b69b8a29d"
 "checksum futures 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "8e51e7f9c150ba7fd4cee9df8bf6ea3dea5b63b68955ddad19ccd35b71dcfb4d"
 "checksum futures-cpupool 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "bb982bb25cd8fa5da6a8eb3a460354c984ff1113da82bcb4f0b0862b5795db82"
-"checksum gcc 0.3.43 (registry+https://github.com/rust-lang/crates.io-index)" = "c07c758b972368e703a562686adb39125707cc1ef3399da8c019fc6c2498a75d"
+"checksum gcc 0.3.51 (registry+https://github.com/rust-lang/crates.io-index)" = "120d07f202dcc3f72859422563522b66fe6463a4c513df062874daad05f85f0a"
 "checksum gdi32-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "0912515a8ff24ba900422ecda800b52f4016a56251922d397c576bf92c690518"
 "checksum getopts 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)" = "d9047cfbd08a437050b363d35ef160452c5fe8ea5187ae0a624708c91581d685"
 "checksum glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "8be18de09a56b60ed0edf84bc9df007e30040691af7acd1c41874faac5895bfb"
@@ -3007,7 +2996,7 @@ dependencies = [
 "checksum memchr 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1dbccc0e46f1ea47b9f17e6d67c5a96bd27030519c519c9c91327e31275a47b4"
 "checksum mime 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a74cc2587bf97c49f3f5bab62860d6abf3902ca73b66b51d9b049fbdcd727bd2"
 "checksum mime_guess 1.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "5e50bf542f81754ef69e5cea856946a3819f7c09ea97b4903c8bc8a89f74e7b6"
-"checksum miniz-sys 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "9d1f4d337a01c32e1f2122510fed46393d53ca35a7f429cb0450abaedfa3ed54"
+"checksum miniz-sys 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)" = "28eaee17666671fa872e567547e8428e83308ebe5808cdf6a0e28397dbe2c726"
 "checksum mio 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)" = "c8ba718a36791275c6782c0445a5f79b5ef4e68c01a4e60ac04aae28290e4957"
 "checksum mio-named-pipes 0.1.4 (git+https://github.com/alexcrichton/mio-named-pipes)" = "<none>"
 "checksum mio-uds 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "78437f00d9615c366932cbfe79790b5c2945706ba67cf78378ffacc0069ed9de"
@@ -3063,7 +3052,6 @@ dependencies = [
 "checksum quine-mc_cluskey 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "a6683b0e23d80813b1a535841f0048c1537d3f86d63c999e8373b39a9b0eb74a"
 "checksum quote 0.3.10 (registry+https://github.com/rust-lang/crates.io-index)" = "6732e32663c9c271bfc7c1823486b471f18c47a2dbf87c066897b7b51afc83be"
 "checksum rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)" = "2791d88c6defac799c3f20d74f094ca33b9332612d9aef9078519c82e4fe04a5"
-"checksum rayon 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "50c575b58c2b109e2fbc181820cbe177474f35610ff9e357dc75f6bac854ffbf"
 "checksum rayon 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8c83adcb08e5b922e804fe1918142b422602ef11f2fd670b0b52218cb5984a20"
 "checksum rayon-core 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "767d91bacddf07d442fe39257bf04fd95897d1c47c545d009f6beb03efd038f8"
 "checksum regex 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4278c17d0f6d62dfef0ab00028feb45bd7d2102843f80763474eeb1be8a10c01"