diff --git a/servo/Cargo.lock b/servo/Cargo.lock
index 9d9aff6e31ef5..346e0fbcb5aeb 100644
--- a/servo/Cargo.lock
+++ b/servo/Cargo.lock
@@ -1084,7 +1084,7 @@ dependencies = [
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "malloc_size_of 0.0.1",
  "nsstring_vendor 0.1.0",
- "parking_lot 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "selectors 0.19.0",
  "servo_arc 0.0.1",
  "style 0.0.1",
@@ -1530,7 +1530,7 @@ dependencies = [
  "msg 0.0.1",
  "net_traits 0.0.1",
  "ordered-float 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "profile_traits 0.0.1",
  "range 0.0.1",
  "rayon 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1580,7 +1580,7 @@ dependencies = [
  "metrics 0.0.1",
  "msg 0.0.1",
  "net_traits 0.0.1",
- "parking_lot 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "profile_traits 0.0.1",
  "range 0.0.1",
  "rayon 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2215,17 +2215,16 @@ dependencies = [
 
 [[package]]
 name = "parking_lot"
-version = "0.4.4"
+version = "0.4.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "owning_ref 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot_core 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "thread-id 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot_core 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "parking_lot_core"
-version = "0.2.2"
+version = "0.2.6"
 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)",
@@ -2600,7 +2599,7 @@ dependencies = [
  "num-traits 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)",
  "offscreen_gl_context 0.11.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "open 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "phf 0.7.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "phf_codegen 0.7.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "phf_shared 0.7.21 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3141,7 +3140,7 @@ dependencies = [
  "num_cpus 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ordered-float 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "owning_ref 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "pdqsort 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "precomputed-hash 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rayon 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3182,7 +3181,7 @@ dependencies = [
  "cssparser 0.21.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.15.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "html5ever 0.19.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "rayon 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "selectors 0.19.0",
@@ -3934,8 +3933,8 @@ dependencies = [
 "checksum osmesa-src 17.2.0-devel (git+https://github.com/servo/osmesa-src)" = "<none>"
 "checksum osmesa-sys 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "88cfece6e95d2e717e0872a7f53a8684712ad13822a7979bc760b9c77ec0013b"
 "checksum owning_ref 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "cdf84f41639e037b484f93433aa3897863b561ed65c6e59c7073d7c561710f37"
-"checksum parking_lot 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)" = "37f364e2ce5efa24c7d0b6646d5bb61145551a0112f107ffd7499f1a3e322fbd"
-"checksum parking_lot_core 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "0ad2c4d148942b3560034785bf19df586ebba53351e8c78f84984147d5795eef"
+"checksum parking_lot 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)" = "149d8f5b97f3c1133e3cfcd8886449959e856b557ff281e292b733d7c69e005e"
+"checksum parking_lot_core 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "4f610cb9664da38e417ea3225f23051f589851999535290e077939838ab7a595"
 "checksum parse-hosts 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "9aebf4a4f84ce5d940a30a919c93325a66ab4ddb646f5f0a3d77483eb99595a6"
 "checksum pdqsort 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "ceca1642c89148ca05611cc775a0c383abef355fc4907c4e95f49f7b09d6287c"
 "checksum peeking_take_while 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "19b17cddbe7ec3f8bc800887bab5e717348c95ea2ca0b1bf0837fb964dc67099"
diff --git a/servo/components/script/lib.rs b/servo/components/script/lib.rs
index 11351d88a6ca6..1cd37ca6c707c 100644
--- a/servo/components/script/lib.rs
+++ b/servo/components/script/lib.rs
@@ -6,6 +6,8 @@
 #![feature(box_syntax)]
 #![feature(conservative_impl_trait)]
 #![feature(const_fn)]
+#![feature(const_ptr_null)]
+#![feature(const_ptr_null_mut)]
 #![feature(core_intrinsics)]
 #![feature(mpsc_select)]
 #![feature(nonzero)]
diff --git a/servo/rust-toolchain b/servo/rust-toolchain
index 6a96eebe488de..1ca562033e92c 100644
--- a/servo/rust-toolchain
+++ b/servo/rust-toolchain
@@ -1 +1 @@
-nightly-2017-09-08
+nightly-2017-09-17