diff --git a/components/selectors/attr.rs b/components/selectors/attr.rs
index 8ef4365d77b..c912f7f8b94 100644
--- a/components/selectors/attr.rs
+++ b/components/selectors/attr.rs
@@ -4,7 +4,6 @@
 
 use cssparser::ToCss;
 use parser::SelectorImpl;
-#[allow(unused_imports)] use std::ascii::AsciiExt;
 use std::fmt;
 
 #[derive(Clone, Eq, PartialEq)]
diff --git a/components/selectors/parser.rs b/components/selectors/parser.rs
index 5fd73ce8d73..601b7e23986 100644
--- a/components/selectors/parser.rs
+++ b/components/selectors/parser.rs
@@ -14,7 +14,6 @@ use precomputed_hash::PrecomputedHash;
 use servo_arc::ThinArc;
 use sink::Push;
 use smallvec::SmallVec;
-#[allow(unused_imports)] use std::ascii::AsciiExt;
 use std::borrow::{Borrow, Cow};
 use std::fmt::{self, Display, Debug, Write};
 use std::iter::Rev;
diff --git a/components/style_traits/viewport.rs b/components/style_traits/viewport.rs
index 75dd13870e0..d961fa9e62e 100644
--- a/components/style_traits/viewport.rs
+++ b/components/style_traits/viewport.rs
@@ -7,7 +7,6 @@
 use {CSSPixel, CssWriter, ParseError, PinchZoomFactor, ToCss};
 use cssparser::Parser;
 use euclid::TypedSize2D;
-#[allow(unused_imports)] use std::ascii::AsciiExt;
 use std::fmt::{self, Write};
 
 define_css_keyword_enum! {
diff --git a/rust-toolchain b/rust-toolchain
index a80d36c679b..b37ad66c2be 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-nightly-2018-01-21
+nightly-2018-01-27