diff --git a/components/servo/Cargo.lock b/components/servo/Cargo.lock
index e75365fc3a7..33a3270c05c 100644
--- a/components/servo/Cargo.lock
+++ b/components/servo/Cargo.lock
@@ -2039,7 +2039,7 @@ dependencies = [
  "lazy_static 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "matches 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "num 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
  "plugins 0.0.1",
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "selectors 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/components/style/Cargo.toml b/components/style/Cargo.toml
index 6aee2f66cfd..7160f796fa4 100644
--- a/components/style/Cargo.toml
+++ b/components/style/Cargo.toml
@@ -34,7 +34,7 @@ heapsize_plugin = "0.1.2"
 lazy_static = "0.1.16"
 log = "0.3.5"
 matches = "0.1"
-num = "0.1.24"
+num-traits = "0.1.32"
 rustc-serialize = "0.3"
 selectors = {version = "0.5", features = ["heap_size", "unstable"]}
 serde = {version = "0.7", features = ["nightly"]}
diff --git a/components/style/attr.rs b/components/style/attr.rs
index 43652c3dc8a..363c5b44f52 100644
--- a/components/style/attr.rs
+++ b/components/style/attr.rs
@@ -5,7 +5,7 @@
 use app_units::Au;
 use cssparser::{self, Color, RGBA};
 use euclid::num::Zero;
-use num::ToPrimitive;
+use num_traits::ToPrimitive;
 use std::ascii::AsciiExt;
 use std::ops::Deref;
 use std::str::FromStr;
diff --git a/components/style/lib.rs b/components/style/lib.rs
index 951a32cd3ce..86e24be674d 100644
--- a/components/style/lib.rs
+++ b/components/style/lib.rs
@@ -34,7 +34,7 @@ extern crate lazy_static;
 extern crate log;
 #[macro_use]
 extern crate matches;
-extern crate num;
+extern crate num_traits;
 extern crate rustc_serialize;
 extern crate selectors;
 extern crate serde;
diff --git a/components/style/viewport.rs b/components/style/viewport.rs
index 2b5d9ea3175..2f8377102c9 100644
--- a/components/style/viewport.rs
+++ b/components/style/viewport.rs
@@ -512,7 +512,7 @@ impl MaybeNew for ViewportConstraints {
                      rule: &ViewportRule)
                      -> Option<ViewportConstraints>
     {
-        use num::{Float, ToPrimitive};
+        use num_traits::{Float, ToPrimitive};
         use std::cmp;
 
         if rule.declarations.is_empty() {
diff --git a/ports/cef/Cargo.lock b/ports/cef/Cargo.lock
index b6dbfa5a0e4..309ef9907b3 100644
--- a/ports/cef/Cargo.lock
+++ b/ports/cef/Cargo.lock
@@ -1942,7 +1942,7 @@ dependencies = [
  "lazy_static 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "matches 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "num 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
  "plugins 0.0.1",
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "selectors 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/ports/geckolib/Cargo.lock b/ports/geckolib/Cargo.lock
index e2c17c41381..8b71f8bcc59 100644
--- a/ports/geckolib/Cargo.lock
+++ b/ports/geckolib/Cargo.lock
@@ -448,7 +448,7 @@ dependencies = [
  "lazy_static 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "matches 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "num 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
  "plugins 0.0.1",
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "selectors 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/ports/gonk/Cargo.lock b/ports/gonk/Cargo.lock
index 6c2aa7babef..79ed831c57e 100644
--- a/ports/gonk/Cargo.lock
+++ b/ports/gonk/Cargo.lock
@@ -1922,7 +1922,7 @@ dependencies = [
  "lazy_static 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "matches 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "num 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
  "plugins 0.0.1",
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "selectors 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",