diff --git a/Cargo.lock b/Cargo.lock
index 7801cf9..eb76e96 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -661,7 +661,7 @@ dependencies = [
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.28 (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 1.0.2 (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)",
@@ -671,7 +671,7 @@ dependencies = [
 
 [[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)",
@@ -686,7 +686,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.28 (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)",
  "tokio-buf 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -704,7 +704,7 @@ dependencies = [
  "futures 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "h2 0.1.26 (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 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "httparse 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1457,7 +1457,7 @@ dependencies = [
  "encoding_rs 0.8.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "flate2 1.0.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.28 (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)",
  "hyper 0.12.33 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper-rustls 0.16.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper-tls 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2290,7 +2290,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum generic-array 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)" = "c68f0274ae0e023facc3c97b2e00f076be70e254bc851d972503b328db79b2ec"
 "checksum getrandom 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)" = "6171a6cc63fbabbe27c2b5ee268e8b7fe5dc1eb0dd2dfad537c1dfed6f69117e"
 "checksum h2 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)" = "a5b34c246847f938a410a03c5458c7fee2274436675e76d8b903c08efc29c462"
-"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 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "6741c859c1b2463a423a1dbce98d418e6c3c3fc720fb0d45528657320920292d"
 "checksum httparse 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "cd179ae861f0c2e53da70d892f5f3029f9594be0c41dc5269cd371691b1dc2f9"
 "checksum hyper 0.12.33 (registry+https://github.com/rust-lang/crates.io-index)" = "7cb44cbce9d8ee4fb36e4c0ad7b794ac44ebaad924b9c8291a63215bb44c2c8f"