diff --git a/Cargo.lock b/Cargo.lock
index 2cab1fa7e92..933bfb90757 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -252,8 +252,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "bytes"
-version = "0.3.0"
+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 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "canvas"
@@ -652,7 +656,7 @@ name = "debugger"
 version = "0.0.1"
 dependencies = [
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "ws 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ws 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -3486,6 +3490,7 @@ version = "0.57.0"
 source = "git+https://github.com/servo/webrender#1c8497485dd15692bbd6ad5db31547725c7745df"
 dependencies = [
  "app_units 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "base64 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "bincode 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3497,6 +3502,7 @@ dependencies = [
  "freetype 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "fxhash 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "gleam 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "image 0.18.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3504,10 +3510,12 @@ dependencies = [
  "rayon 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ron 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "thread_profiler 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)",
  "webrender_api 0.57.0 (git+https://github.com/servo/webrender)",
+ "ws 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -3622,10 +3630,11 @@ dependencies = [
 
 [[package]]
 name = "ws"
-version = "0.6.0"
+version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.3.0 (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)",
  "httparse 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3741,7 +3750,7 @@ dependencies = [
 "checksum brotli 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "fe87b40996b84fdc56e57c165d93079f4b50cb806598118e692ddfaa3d3c57c0"
 "checksum brotli-decompressor 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "313f4b6cc0b365d6b88eda5aa40175ee34ac6efa9a79e0b3b8202eca90247ba8"
 "checksum byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "652805b7e73fada9d85e9a6682a4abd490cb52d96aeecc12e33a0de34dfd0d23"
-"checksum bytes 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c129aff112dcc562970abb69e2508b40850dd24c274761bb50fb8a0067ba6c27"
+"checksum bytes 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "1b7db437d718977f6dc9b2e3fd6fc343c02ac6b899b73fdd2179163447bd9ce9"
 "checksum caseless 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e3261638034d9db4f94a666ebb16494846341ae5a8456c05c1616d66980cf39a"
 "checksum cc 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "9be26b24e988625409b19736d130f0c7d224f01d06454b5f81d8d23d6c1a618f"
 "checksum cexpr 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "393a5f0088efbe41f9d1fcd062f24e83c278608420e62109feb2c8abee07de7d"
@@ -4006,7 +4015,7 @@ dependencies = [
 "checksum winapi-x86_64-pc-windows-gnu 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "98f12c52b2630cd05d2c3ffd8e008f7f48252c042b4871c72aed9dc733b96668"
 "checksum winit 0.11.2 (registry+https://github.com/rust-lang/crates.io-index)" = "396f0350e661940359e3c8c7d58ff847f67997943e2c80ecac374c5aa8287f63"
 "checksum winres 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "27d9192d6356d7efe8405dec6c5506b67543cf64b6049968f39f4c4623b4f25d"
-"checksum ws 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "04614a58714f3fd4a8b1da4bcae9f031c532d35988c3d39627619248113f8be8"
+"checksum ws 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)" = "89c48c53bf9dee34411a08993c10b879c36e105d609b46e25673befe3a5c1320"
 "checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
 "checksum x11 2.17.3 (registry+https://github.com/rust-lang/crates.io-index)" = "7e5c4ac579b5d324dc4add02312b5d0e3e0218521e2d5779d526ac39ee4bb171"
 "checksum x11-clipboard 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "2e7374c7699210cca7084ca61d57e09640fc744d1391808cb9ae2fe4ca9bd1df"
diff --git a/components/debugger/Cargo.toml b/components/debugger/Cargo.toml
index d098148528c..a5f2f4b4eab 100644
--- a/components/debugger/Cargo.toml
+++ b/components/debugger/Cargo.toml
@@ -12,4 +12,4 @@ crate_type = ["rlib"]
 
 [dependencies]
 log = "0.3.5"
-ws = "0.6"
+ws = "0.7.3"
diff --git a/components/servo/Cargo.toml b/components/servo/Cargo.toml
index a7860f5ef13..2bdb5e9af34 100644
--- a/components/servo/Cargo.toml
+++ b/components/servo/Cargo.toml
@@ -17,6 +17,7 @@ webdriver = ["webdriver_server"]
 energy-profiling = ["profile_traits/energy-profiling"]
 debugmozjs = ["script/debugmozjs"]
 googlevr = ["webvr/googlevr"]
+webrender_debugger = ["webrender/debugger"]
 oculusvr = ["webvr/oculusvr"]
 unstable = [
     "euclid/unstable",