diff --git a/Cargo.lock b/Cargo.lock
index 489a7fabaf3fa..6305c106484fe 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -57,7 +57,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "app_units"
-version = "0.5.3"
+version = "0.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "heapsize 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1098,7 +1098,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "gfx"
 version = "0.0.1"
 dependencies = [
- "app_units 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "app_units 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-foundation 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1511,7 +1511,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "layout"
 version = "0.0.1"
 dependencies = [
- "app_units 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "app_units 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "atomic_refcell 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "canvas_traits 0.0.1",
@@ -1561,7 +1561,7 @@ dependencies = [
 name = "layout_thread"
 version = "0.0.1"
 dependencies = [
- "app_units 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "app_units 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "atomic_refcell 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.15.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2535,7 +2535,7 @@ name = "script"
 version = "0.0.1"
 dependencies = [
  "angle 0.5.0 (git+https://github.com/servo/angle?branch=servo)",
- "app_units 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "app_units 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "audio-video-metadata 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "base64 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2614,7 +2614,7 @@ dependencies = [
 name = "script_layout_interface"
 version = "0.0.1"
 dependencies = [
- "app_units 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "app_units 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "atomic_refcell 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "canvas_traits 0.0.1",
  "cssparser 0.20.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2923,7 +2923,7 @@ dependencies = [
 name = "servo_geometry"
 version = "0.0.1"
 dependencies = [
- "app_units 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "app_units 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.15.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -3079,7 +3079,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "style"
 version = "0.0.1"
 dependencies = [
- "app_units 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "app_units 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "arraydeque 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "arrayvec 0.3.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "atomic_refcell 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3144,7 +3144,7 @@ dependencies = [
 name = "style_tests"
 version = "0.0.1"
 dependencies = [
- "app_units 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "app_units 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "cssparser 0.20.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.15.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3166,7 +3166,7 @@ dependencies = [
 name = "style_traits"
 version = "0.0.1"
 dependencies = [
- "app_units 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "app_units 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "cssparser 0.20.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.15.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3558,7 +3558,7 @@ name = "webrender"
 version = "0.50.0"
 source = "git+https://github.com/servo/webrender#01c38a21e6951dcc0241b1b65d6acb837d42ba22"
 dependencies = [
- "app_units 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "app_units 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "bincode 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "bit-set 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3586,7 +3586,7 @@ name = "webrender_api"
 version = "0.50.0"
 source = "git+https://github.com/servo/webrender#01c38a21e6951dcc0241b1b65d6acb837d42ba22"
 dependencies = [
- "app_units 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "app_units 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "bincode 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-foundation 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3724,7 +3724,7 @@ dependencies = [
 "checksum angle 0.5.0 (git+https://github.com/servo/angle?branch=servo)" = "<none>"
 "checksum ansi_term 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "23ac7c30002a5accbf7e8987d0632fa6de155b7c3d39d0067317a391e00a2ef6"
 "checksum antidote 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "34fde25430d87a9388dadbe6e34d7f72a462c8b43ac8d309b42b0a8505d7e2a5"
-"checksum app_units 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "7ff4f3fe57393a150b39b026b6f6f4b9a6c4f49b52d0a4e2d61d08d926358438"
+"checksum app_units 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)" = "ed0a4de09a3b8449515e649f3bb84f72ea15fc2d10639beb0776a09b7d308074"
 "checksum arraydeque 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "96e774cadb24c2245225280c6799793f9802b918a58a79615e9490607489a717"
 "checksum arrayvec 0.3.23 (registry+https://github.com/rust-lang/crates.io-index)" = "699e63a93b79d717e8c3b5eb1b28b7780d0d6d9e59a72eb769291c83b0c8dc67"
 "checksum aster 0.41.0 (registry+https://github.com/rust-lang/crates.io-index)" = "4ccfdf7355d9db158df68f976ed030ab0f6578af811f5a7bb6dcf221ec24e0e0"
diff --git a/python/servo/bootstrap_commands.py b/python/servo/bootstrap_commands.py
index dfb88b74272a0..edaad4f6dbbf2 100644
--- a/python/servo/bootstrap_commands.py
+++ b/python/servo/bootstrap_commands.py
@@ -90,12 +90,8 @@ def bootstrap_rustc(self, force=False, target=[], stable=False):
                 base_url = static_s3
             else:
                 import toml
-                import re
                 channel = "%s/%s/channel-rust-nightly.toml" % (static_s3, self.rust_nightly_date())
-                version_string = toml.load(urllib2.urlopen(channel))["pkg"]["rustc"]["version"]
-                short_commit = re.search("\(([0-9a-f]+) ", version_string).group(1)
-                commit_api = "https://api.github.com/repos/rust-lang/rust/commits/" + short_commit
-                nightly_commit_hash = json.load(urllib2.urlopen(commit_api))["sha"]
+                nightly_commit_hash = toml.load(urllib2.urlopen(channel))["pkg"]["rustc"]["git_commit_hash"]
 
                 base_url = "https://s3.amazonaws.com/rust-lang-ci/rustc-builds"
                 if not self.config["build"]["llvm-assertions"]:
diff --git a/rust-toolchain b/rust-toolchain
index 009c84eceb4fd..6a96eebe488de 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-nightly-2017-08-31
+nightly-2017-09-08