diff --git a/Cargo.lock b/Cargo.lock
index 574ec9b..b972ac9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -630,7 +630,7 @@ dependencies = [
  "futures-core-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-sink-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-util-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "http 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "indexmap 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -647,7 +647,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "http"
-version = "0.1.18"
+version = "0.1.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -661,7 +661,7 @@ version = "0.2.0-alpha.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "http 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -679,7 +679,7 @@ dependencies = [
  "futures-core-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-util-preview 0.3.0-alpha.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "h2 0.2.0-alpha.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "http 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "http-body 0.2.0-alpha.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "httparse 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1868,7 +1868,7 @@ dependencies = [
  "base64 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "http 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "httparse 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "input_buffer 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2072,7 +2072,7 @@ dependencies = [
 "checksum goblin 0.0.24 (registry+https://github.com/rust-lang/crates.io-index)" = "e3fa261d919c1ae9d1e4533c4a2f99e10938603c4208d56c05bec7a872b661b0"
 "checksum h2 0.2.0-alpha.3 (registry+https://github.com/rust-lang/crates.io-index)" = "0f107db1419ef8271686187b1a5d47c6431af4a7f4d98b495e7b7fc249bb0a78"
 "checksum hound 3.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8a164bb2ceaeff4f42542bdb847c41517c78a60f5649671b2a07312b6e117549"
-"checksum http 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)" = "372bcb56f939e449117fb0869c2e8fd8753a8223d92a172c6e808cf123a5b6e4"
+"checksum http 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)" = "d6ccf5ede3a895d8856620237b2f02972c1bbc78d2965ad7fe8838d4a0ed41f0"
 "checksum http-body 0.2.0-alpha.3 (registry+https://github.com/rust-lang/crates.io-index)" = "1f3aef6f3de2bd8585f5b366f3f550b5774500b4764d00cf00f903c95749eec3"
 "checksum httparse 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "cd179ae861f0c2e53da70d892f5f3029f9594be0c41dc5269cd371691b1dc2f9"
 "checksum hyper 0.13.0-alpha.4 (registry+https://github.com/rust-lang/crates.io-index)" = "2d05aa523087ac0b9d8b93dd80d5d482a697308ed3b0dca7b0667511a7fa7cdc"