diff --git a/.travis.yml b/.travis.yml
index 1316ffbd..7467a615 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: rust
 rust:
-  - 1.20.0
+  - 1.21.0
   - stable
   - beta
   - nightly
diff --git a/Cargo.lock b/Cargo.lock
index 7671881d..647cacf8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,3 +1,10 @@
+[root]
+name = "librespot-protocol"
+version = "0.1.0"
+dependencies = [
+ "protobuf 1.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "aho-corasick"
 version = "0.6.4"
@@ -11,7 +18,15 @@ name = "alsa"
 version = "0.0.1"
 source = "git+https://github.com/plietar/rust-alsa#8c63543fa0ccd971cf15f5675293d19febd6f79e"
 dependencies = [
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "arrayvec"
+version = "0.4.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "nodrop 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -75,7 +90,7 @@ version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "iovec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -83,6 +98,44 @@ name = "cfg-if"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "crossbeam-deque"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-epoch 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-epoch"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memoffset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "dns-parser"
 version = "0.3.2"
@@ -98,7 +151,7 @@ name = "dns-sd"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -113,12 +166,12 @@ version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "error-chain"
-version = "0.9.0"
+version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -126,10 +179,10 @@ name = "extprim"
 version = "1.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "num-traits 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.1.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -148,7 +201,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "futures"
-version = "0.1.17"
+version = "0.1.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -156,7 +209,7 @@ name = "futures-cpupool"
 version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -167,7 +220,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "getopts"
-version = "0.2.15"
+version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -177,27 +230,40 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "hyper"
-version = "0.11.14"
+version = "0.11.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "base64 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "bytes 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "httparse 1.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "language-tags 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "mime 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "relay 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "relay 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-core 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-core 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-proto 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-service 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicase 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "hyper-proxy"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bytes 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.11.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-core 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "idna"
 version = "0.1.4"
@@ -210,10 +276,10 @@ dependencies = [
 
 [[package]]
 name = "iovec"
-version = "0.1.1"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -230,7 +296,7 @@ dependencies = [
  "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "jack-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -239,7 +305,7 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "libloading 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -283,7 +349,7 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.36"
+version = "0.2.39"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -301,7 +367,7 @@ name = "libpulse-sys"
 version = "0.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -310,9 +376,9 @@ version = "0.1.0"
 dependencies = [
  "base64 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "getopts 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.11.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "getopts 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.11.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "librespot-audio 0.1.0",
  "librespot-connect 0.1.0",
  "librespot-core 0.1.0",
@@ -320,18 +386,18 @@ dependencies = [
  "librespot-playback 0.1.0",
  "librespot-protocol 0.1.0",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-bigint 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
- "protobuf 1.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.3.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-bigint 0.1.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "protobuf 1.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
  "rpassword 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 0.9.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 0.9.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 0.9.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-core 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-signal 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-core 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-signal 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "vergen 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -341,12 +407,12 @@ version = "0.1.0"
 dependencies = [
  "bit-set 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "lewton 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "librespot-core 0.1.0",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-bigint 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-traits 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-bigint 0.1.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.1.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempfile 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tremor 0.1.0 (git+https://github.com/plietar/rust-tremor)",
@@ -359,22 +425,22 @@ version = "0.1.0"
 dependencies = [
  "base64 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "dns-sd 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.11.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.11.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "librespot-core 0.1.0",
  "librespot-playback 0.1.0",
  "librespot-protocol 0.1.0",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "mdns 0.2.0 (git+https://github.com/plietar/rust-mdns)",
- "num-bigint 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
- "protobuf 1.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.3.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-bigint 0.1.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "protobuf 1.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
  "rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 0.9.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 0.9.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 0.9.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-core 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-core 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -384,26 +450,29 @@ dependencies = [
  "base64 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "bytes 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "error-chain 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "extprim 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.11.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "httparse 1.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.11.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper-proxy 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "librespot-protocol 0.1.0",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-bigint 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-integer 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-traits 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
- "protobuf 1.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.3.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-bigint 0.1.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-integer 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.1.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "protobuf 1.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
  "rpassword 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 0.9.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 0.9.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 0.9.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "shannon 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-core 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-io 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-core 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "uuid 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "vergen 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -413,11 +482,11 @@ name = "librespot-metadata"
 version = "0.1.0"
 dependencies = [
  "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "librespot-core 0.1.0",
  "librespot-protocol 0.1.0",
  "linear-map 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "protobuf 1.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "protobuf 1.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -426,9 +495,9 @@ version = "0.1.0"
 dependencies = [
  "alsa 0.0.1 (git+https://github.com/plietar/rust-alsa)",
  "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "jack 0.5.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "libpulse-sys 0.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "librespot-audio 0.1.0",
  "librespot-core 0.1.0",
@@ -437,13 +506,6 @@ dependencies = [
  "portaudio-rs 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "librespot-protocol"
-version = "0.1.0"
-dependencies = [
- "protobuf 1.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "linear-map"
 version = "1.2.0"
@@ -473,18 +535,21 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "mdns"
 version = "0.2.0"
-source = "git+https://github.com/plietar/rust-mdns#c0fc73502d7d752a4ffeb5268a017561405e218c"
+source = "git+https://github.com/plietar/rust-mdns#733b2b66d7ad4190e7a752e6e3cfeeb4b0627852"
 dependencies = [
  "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "dns-parser 0.3.2 (git+https://github.com/plietar/dns-parser)",
- "futures 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "multimap 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "net2 0.2.31 (registry+https://github.com/rust-lang/crates.io-index)",
+ "net2 0.2.32 (registry+https://github.com/rust-lang/crates.io-index)",
  "nix 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.3.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-core 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "socket2 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-core 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -492,9 +557,14 @@ name = "memchr"
 version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "memoffset"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "mime"
 version = "0.3.5"
@@ -505,19 +575,19 @@ dependencies = [
 
 [[package]]
 name = "mio"
-version = "0.6.12"
+version = "0.6.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "iovec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazycell 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "miow 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "net2 0.2.31 (registry+https://github.com/rust-lang/crates.io-index)",
- "slab 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "net2 0.2.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "slab 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -526,8 +596,8 @@ name = "mio-uds"
 version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.14 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -536,7 +606,7 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "net2 0.2.31 (registry+https://github.com/rust-lang/crates.io-index)",
+ "net2 0.2.32 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -548,14 +618,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "net2"
-version = "0.2.31"
+version = "0.2.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -565,32 +633,45 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "nodrop"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "num-bigint"
-version = "0.1.41"
+version = "0.1.43"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "num-integer 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-traits 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.3.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-integer 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "num-integer"
-version = "0.1.35"
+version = "0.1.36"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "num-traits 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "num-traits"
-version = "0.1.41"
+version = "0.1.43"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "num-traits 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "num-traits"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -598,7 +679,7 @@ name = "num_cpus"
 version = "1.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -615,7 +696,7 @@ version = "0.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "gcc 0.3.54 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -635,7 +716,7 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "portaudio-sys 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -644,13 +725,21 @@ name = "portaudio-sys"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "proc-macro2"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "protobuf"
-version = "1.4.3"
+version = "1.4.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -663,13 +752,22 @@ name = "quote"
 version = "0.3.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "quote"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rand"
-version = "0.3.20"
+version = "0.3.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -678,7 +776,7 @@ version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -689,27 +787,30 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "regex"
-version = "0.2.5"
+version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "aho-corasick 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "memchr 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex-syntax 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex-syntax 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "thread_local 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "utf8-ranges 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "regex-syntax"
-version = "0.4.2"
+version = "0.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "ucd-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "relay"
-version = "0.1.0"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -718,7 +819,7 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "termios 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -729,8 +830,8 @@ version = "0.2.36"
 source = "git+https://github.com/awmath/rust-crypto.git?branch=avx2#394c247254dbe2ac5d44483232cf335d10cf0260"
 dependencies = [
  "gcc 0.3.54 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.3.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -761,7 +862,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "scoped-tls"
-version = "0.1.0"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "scopeguard"
+version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -784,10 +890,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde"
-version = "1.0.27"
+version = "1.0.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde_derive 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -810,21 +916,22 @@ dependencies = [
 
 [[package]]
 name = "serde_derive"
-version = "1.0.27"
+version = "1.0.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "quote 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive_internals 0.19.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive_internals 0.22.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.12.14 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "serde_derive_internals"
-version = "0.19.0"
+version = "0.22.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "synom 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.12.14 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -834,7 +941,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "dtoa 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "itoa 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-traits 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.1.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 0.9.15 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -861,6 +968,18 @@ name = "smallvec"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "socket2"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "syn"
 version = "0.11.11"
@@ -871,6 +990,16 @@ dependencies = [
  "unicode-xid 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "syn"
+version = "0.12.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "synom"
 version = "0.11.3"
@@ -890,8 +1019,8 @@ version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.3.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_syscall 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -901,7 +1030,7 @@ name = "termios"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -918,34 +1047,60 @@ name = "time"
 version = "0.1.39"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_syscall 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "tokio"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-executor 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-reactor 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-tcp 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-threadpool 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-udp 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "tokio-core"
-version = "0.1.12"
+version = "0.1.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
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+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+
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@@ -1033,6 +1245,11 @@ name = "unicode-xid"
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+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+
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@@ -1043,7 +1260,7 @@ dependencies = [
 
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- "rand 0.3.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1088,9 +1305,9 @@ name = "vorbis"
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 dependencies = [
- "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
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- "rand 0.3.20 (registry+https://github.com/rust-lang/crates.io-index)",
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diff --git a/README.md b/README.md
index bab26a7b..4ea5b520 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ If you wish to learn more about how librespot works overall, the best way is to
 If you run into a bug when using librespot, please search the existing issues before opening a new one. Chances are, we've encountered it before, and have provided a resolution. If not, please open a new one, and where possible, include the backtrace librespot generates on crashing, along with anything we can use to reproduce the issue, eg. the Spotify URI of the song that caused the crash.
 
 # Building
-Rust 1.20.0 or later is required to build librespot.
+Rust 1.21.0 or later is required to build librespot.
 
 **If you are building librespot on macOS, the homebrew provided rust may fail due to the way in which homebrew installs rust. In this case, uninstall the homebrew version of rust and use [rustup](https://www.rustup.rs/), and librespot should then build. This should have been fixed in more recent versions of Homebrew, but we're leaving this notice here as a warning.**
 
diff --git a/core/Cargo.toml b/core/Cargo.toml
index ed1206aa..ee8a9875 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -11,7 +11,7 @@ path = "../protocol"
 base64 = "0.5.0"
 byteorder = "1.0"
 bytes = "0.4"
-error-chain = { version = "0.9.0", default_features = false }
+error-chain = { version = "0.11.0", default_features = false }
 extprim = "1.5.1"
 futures = "0.1.8"
 httparse = "1.2.4"