diff --git a/components/servo/Cargo.lock b/components/servo/Cargo.lock
index 3567185edac4..c9c0abfc811b 100644
--- a/components/servo/Cargo.lock
+++ b/components/servo/Cargo.lock
@@ -1067,7 +1067,7 @@ dependencies = [
 [[package]]
 name = "js"
 version = "0.1.3"
-source = "git+https://github.com/servo/rust-mozjs#28f9fb0625a798ad53abf7edeb3e8b7bc0007dc3"
+source = "git+https://github.com/servo/rust-mozjs#7ccfee50f407841b8cd03b6520a2b9db866ac90a"
 dependencies = [
  "heapsize 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1075,7 +1075,6 @@ dependencies = [
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "mozjs_sys 0.0.0 (git+https://github.com/servo/mozjs)",
  "num-traits 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
diff --git a/ports/cef/Cargo.lock b/ports/cef/Cargo.lock
index 4e903d6a0038..aaa31a651de1 100644
--- a/ports/cef/Cargo.lock
+++ b/ports/cef/Cargo.lock
@@ -976,7 +976,7 @@ dependencies = [
 [[package]]
 name = "js"
 version = "0.1.3"
-source = "git+https://github.com/servo/rust-mozjs#28f9fb0625a798ad53abf7edeb3e8b7bc0007dc3"
+source = "git+https://github.com/servo/rust-mozjs#7ccfee50f407841b8cd03b6520a2b9db866ac90a"
 dependencies = [
  "heapsize 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -984,7 +984,6 @@ dependencies = [
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "mozjs_sys 0.0.0 (git+https://github.com/servo/mozjs)",
  "num-traits 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]