diff --git a/Cargo.lock b/Cargo.lock
index 539c330..8c0537b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -17,7 +17,7 @@ dependencies = [
  "tokio 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-reactor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-signal 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-tcp 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -43,7 +43,7 @@ dependencies = [
  "tokio 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-current-thread 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-reactor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-tcp 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-timer 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -94,7 +94,7 @@ dependencies = [
  "time 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-current-thread 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-reactor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-tcp 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-timer 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -492,7 +492,7 @@ dependencies = [
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "string 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1227,7 +1227,7 @@ dependencies = [
  "tokio-current-thread 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-fs 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-reactor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-tcp 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-threadpool 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1243,7 +1243,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1269,13 +1269,13 @@ version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-threadpool 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "tokio-io"
-version = "0.1.10"
+version = "0.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1308,7 +1308,7 @@ dependencies = [
  "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1322,7 +1322,7 @@ dependencies = [
  "mio-uds 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "signal-hook 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-reactor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1336,7 +1336,7 @@ dependencies = [
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-reactor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1375,7 +1375,7 @@ dependencies = [
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-reactor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1392,7 +1392,7 @@ dependencies = [
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio-uds 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-reactor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1419,7 +1419,7 @@ dependencies = [
  "smallvec 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "socket2 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-reactor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-tcp 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-timer 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1442,7 +1442,7 @@ dependencies = [
  "smallvec 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "socket2 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-reactor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-tcp 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-timer 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1597,7 +1597,7 @@ dependencies = [
  "serde_json 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-pty-process 0.3.0",
 ]
 
@@ -1821,7 +1821,7 @@ dependencies = [
 "checksum tokio-current-thread 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "331c8acc267855ec06eb0c94618dcbbfea45bed2d20b77252940095273fb58f6"
 "checksum tokio-executor 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "c117b6cf86bb730aab4834f10df96e4dd586eff2c3c27d3781348da49e255bde"
 "checksum tokio-fs 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "60ae25f6b17d25116d2cba342083abe5255d3c2c79cb21ea11aa049c53bf7c75"
-"checksum tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)" = "7392fe0a70d5ce0c882c4778116c519bd5dbaa8a7c3ae3d04578b3afafdcda21"
+"checksum tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)" = "5090db468dad16e1a7a54c8c67280c5e4b544f3d3e018f0b913b400261f85926"
 "checksum tokio-reactor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "502b625acb4ee13cbb3b90b8ca80e0addd263ddacf6931666ef751e610b07fb5"
 "checksum tokio-signal 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "dd6dc5276ea05ce379a16de90083ec80836440d5ef8a6a39545a3207373b8296"
 "checksum tokio-tcp 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7ad235e9dadd126b2d47f6736f65aa1fdcd6420e66ca63f44177bc78df89f912"
diff --git a/Cargo.toml b/Cargo.toml
index d0f6b4f..5f2aa46 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,7 +15,7 @@ serde = "1.0.89"
 serde_json = "1.0.34"
 tokio = "0.1.13"
 tokio-pty-process = "*"
-tokio-io= "0.1.10"
+tokio-io= "0.1.12"
 tokio-codec= "0.1.1"
 futures = "0.1.25"