diff --git a/Cargo.lock b/Cargo.lock
index 4561b7ecb57..005116dc6f9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -927,7 +927,7 @@ version = "0.0.1"
 dependencies = [
  "crossbeam-channel 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "ws 0.7.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ws 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2967,7 +2967,7 @@ dependencies = [
  "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "uuid 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "webrender_api 0.60.0 (git+https://github.com/servo/webrender)",
- "ws 0.7.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ws 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -4353,6 +4353,17 @@ dependencies = [
  "fake-simd 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "sha-1"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "block-buffer 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fake-simd 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "opaque-debug 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "sha1"
 version = "0.6.0"
@@ -5490,13 +5501,30 @@ dependencies = [
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.18 (git+https://github.com/servo/mio.git?branch=servo)",
  "mio-extras 2.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl 0.10.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "sha1 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "ws"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 1.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "httparse 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.18 (git+https://github.com/servo/mio.git?branch=servo)",
+ "mio-extras 2.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl 0.10.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha-1 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "slab 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "x11"
 version = "2.17.3"
@@ -5926,6 +5954,7 @@ dependencies = [
 "checksum servo-skia 0.30000021.1 (registry+https://github.com/rust-lang/crates.io-index)" = "f6c0a65022054874fc1f38dc45e19192accbae775784c3ff05c3875bcc176c19"
 "checksum servo_media_derive 0.1.0 (git+https://github.com/servo/media)" = "<none>"
 "checksum sha-1 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "51b9d1f3b5de8a167ab06834a7c883bd197f2191e1dda1a22d9ccfeedbf9aded"
+"checksum sha-1 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "23962131a91661d643c98940b20fcaffe62d776a823247be80a48fcb8b6fce68"
 "checksum sha1 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2579985fda508104f7587689507983eadd6a6e84dd35d6d115361f530916fa0d"
 "checksum sha2 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7b4d8bfd0e469f417657573d8451fb33d16cfe0989359b93baf3a1ffc639543d"
 "checksum shared_library 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "8254bf098ce4d8d7cc7cc6de438c5488adc5297e5b7ffef88816c0a91bd289c1"
@@ -6023,6 +6052,7 @@ dependencies = [
 "checksum winres 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "27d9192d6356d7efe8405dec6c5506b67543cf64b6049968f39f4c4623b4f25d"
 "checksum wr_malloc_size_of 0.0.1 (git+https://github.com/servo/webrender)" = "<none>"
 "checksum ws 0.7.9 (registry+https://github.com/rust-lang/crates.io-index)" = "329d3e6dd450a9c5c73024e1047f0be7e24121a68484eb0b5368977bee3cf8c3"
+"checksum ws 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "ec91ea61b83ce033c43c06c52ddc7532f465c0153281610d44c58b74083aee1a"
 "checksum x11 2.17.3 (registry+https://github.com/rust-lang/crates.io-index)" = "7e5c4ac579b5d324dc4add02312b5d0e3e0218521e2d5779d526ac39ee4bb171"
 "checksum x11-clipboard 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d8617c6185c96e5fcf57ff156496d73c9c82b7f09a5fea21b518dd32c10e2e05"
 "checksum x11-dl 2.18.3 (registry+https://github.com/rust-lang/crates.io-index)" = "940586acb859ea05c53971ac231685799a7ec1dee66ac0bccc0e6ad96e06b4e3"
diff --git a/components/debugger/Cargo.toml b/components/debugger/Cargo.toml
index a7bef79f0e8..1e7ed26fedd 100644
--- a/components/debugger/Cargo.toml
+++ b/components/debugger/Cargo.toml
@@ -14,4 +14,4 @@ crate_type = ["rlib"]
 [dependencies]
 crossbeam-channel = "0.3"
 log = "0.4"
-ws = "0.7.3"
+ws = "0.8"
diff --git a/components/hashglobe/Cargo.toml b/components/hashglobe/Cargo.toml
index 4bde6d19f99..1ff1b28bbba 100644
--- a/components/hashglobe/Cargo.toml
+++ b/components/hashglobe/Cargo.toml
@@ -13,4 +13,4 @@ readme = "README.md"
 libc = "0.2"
 
 [dev-dependencies]
-rand = "0.4"
+rand = "0.6"
diff --git a/components/net/Cargo.toml b/components/net/Cargo.toml
index d21dbd56f0e..560aa612203 100644
--- a/components/net/Cargo.toml
+++ b/components/net/Cargo.toml
@@ -58,7 +58,7 @@ time = "0.1.17"
 url = "1.2"
 uuid = {version = "0.7", features = ["v4"]}
 webrender_api = {git = "https://github.com/servo/webrender", features = ["ipc"]}
-ws = { version = "0.7", features = ["ssl"] }
+ws = { version = "0.8", features = ["ssl"] }
 
 [dev-dependencies]
 std_test_override = { path = "../std_test_override" }
diff --git a/components/rand/Cargo.toml b/components/rand/Cargo.toml
index 8550b6763cd..f76d3b17bc3 100644
--- a/components/rand/Cargo.toml
+++ b/components/rand/Cargo.toml
@@ -13,5 +13,5 @@ path = "lib.rs"
 [dependencies]
 lazy_static = "1"
 log = "0.4"
-rand = "0.4"
+rand = "0.6"
 uuid = "0.7"