diff --git a/collector/compile-benchmarks/html5ever/Cargo.lock b/collector/compile-benchmarks/html5ever/Cargo.lock
index f71ebb7be..30ac8690c 100644
--- a/collector/compile-benchmarks/html5ever/Cargo.lock
+++ b/collector/compile-benchmarks/html5ever/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "bitflags"
@@ -143,6 +143,8 @@ dependencies = [
  "phf_codegen",
  "rustc-serialize",
  "rustc-test",
+ "serde 1.0.218",
+ "serde_json",
  "string_cache",
  "tendril",
 ]
@@ -154,6 +156,12 @@ dependencies = [
  "mac",
 ]
 
+[[package]]
+name = "itoa"
+version = "1.0.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4a5f13b858c8d314ee3e8f639011f7ccefe71f97f96e50151fb991f267928e2c"
+
 [[package]]
 name = "kernel32-sys"
 version = "0.2.2"
@@ -194,6 +202,12 @@ version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "100aabe6b8ff4e4a7e32c1c13523379802df0772b82466207ac25b013f193376"
 
+[[package]]
+name = "memchr"
+version = "2.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
+
 [[package]]
 name = "phf"
 version = "0.7.21"
@@ -232,6 +246,24 @@ dependencies = [
  "siphasher",
 ]
 
+[[package]]
+name = "proc-macro2"
+version = "1.0.94"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a31971752e70b8b2686d7e46ec17fb38dad4051d94024c88df49b667caea9c84"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.39"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c1f1914ce909e1658d9907913b4b91947430c7d9be598b15a1912935b8c04801"
+dependencies = [
+ "proc-macro2",
+]
+
 [[package]]
 name = "rand"
 version = "0.3.18"
@@ -267,12 +299,50 @@ dependencies = [
  "time",
 ]
 
+[[package]]
+name = "ryu"
+version = "1.0.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "28d3b2b1366ec20994f1fd18c3c594f05c5dd4bc44d8bb0c1c632c8d6829481f"
+
 [[package]]
 name = "serde"
 version = "0.8.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9dad3f759919b92c3068c696c15c3d17238234498bbdcc80f2c469606f948ac8"
 
+[[package]]
+name = "serde"
+version = "1.0.218"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e8dfc9d19bdbf6d17e22319da49161d5d0108e4188e8b680aef6299eed22df60"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.218"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f09503e191f4e797cb8aac08e9a4a4695c5edf6a2e70e376d961ddd5c969f82b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "serde_json"
+version = "1.0.140"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "20068b6e96dc6c9bd23e01df8827e6c7e1f2fddd43c21810382803c136b99373"
+dependencies = [
+ "itoa",
+ "memchr",
+ "ryu",
+ "serde 1.0.218",
+]
+
 [[package]]
 name = "siphasher"
 version = "0.2.2"
@@ -289,7 +359,18 @@ dependencies = [
  "lazy_static",
  "phf_generator",
  "phf_shared",
- "serde",
+ "serde 0.8.23",
+]
+
+[[package]]
+name = "syn"
+version = "2.0.99"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e02e925281e18ffd9d640e234264753c43edc62d64b2d4cf898f1bc5e75f3fc2"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
 ]
 
 [[package]]
@@ -325,6 +406,12 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "unicode-ident"
+version = "1.0.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a5f39404a5da50712a4c1eecf25e90dd62b613502b7e925fd4e4d19b5c96512"
+
 [[package]]
 name = "unreachable"
 version = "0.1.1"
diff --git a/collector/compile-benchmarks/html5ever/Cargo.toml b/collector/compile-benchmarks/html5ever/Cargo.toml
index 67478f87c..8df656712 100644
--- a/collector/compile-benchmarks/html5ever/Cargo.toml
+++ b/collector/compile-benchmarks/html5ever/Cargo.toml
@@ -2,7 +2,7 @@
 
 name = "html5ever"
 version = "0.5.4"
-authors = [ "The html5ever Project Developers" ]
+authors = ["The html5ever Project Developers"]
 license = "MIT / Apache-2.0"
 repository = "https://github.com/servo/html5ever"
 description = "High-performance browser-grade HTML5 parser"
@@ -35,7 +35,8 @@ rustc-test = "0.1.3"
 
 [build-dependencies]
 phf_codegen = "0.7.3"
-rustc-serialize = "0.3.15"
+serde_json = "1"
+serde = { version = "1", features = ["derive"] }
 html5ever_macros = { version = "0.2.6", path = "macros", optional = true }
 
 [profile.dev]
diff --git a/collector/compile-benchmarks/html5ever/build.rs b/collector/compile-benchmarks/html5ever/build.rs
index 63e1d7fc4..808d6cb0e 100644
--- a/collector/compile-benchmarks/html5ever/build.rs
+++ b/collector/compile-benchmarks/html5ever/build.rs
@@ -7,13 +7,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(rustc_encodable_decodable)]
-
 extern crate phf_codegen;
-extern crate rustc_serialize;
 
-use rustc_serialize::json::{Json, Decoder};
-use rustc_serialize::Decodable;
 use std::collections::HashMap;
 use std::env;
 use std::fs::File;
@@ -99,14 +94,13 @@ fn check_hash(from: &Path, to: &Path) -> Result<(), String> {
 
 fn named_entities_to_phf(from: &Path, to: &Path) {
     // A struct matching the entries in entities.json.
-    #[derive(RustcDecodable)]
+    #[derive(serde::Deserialize)]
     struct CharRef {
         codepoints: Vec<u32>,
         //characters: String,  // Present in the file but we don't need it
     }
 
-    let json = Json::from_reader(&mut File::open(from).unwrap()).unwrap();
-    let entities: HashMap<String, CharRef> = Decodable::decode(&mut Decoder::new(json)).unwrap();
+    let entities: HashMap<String, CharRef> = serde_json::from_reader(&mut File::open(from).unwrap()).unwrap();
     let mut entities: HashMap<&str, (u32, u32)> = entities.iter().map(|(name, char_ref)| {
         assert!(name.starts_with("&"));
         assert!(char_ref.codepoints.len() <= 2);
@@ -115,7 +109,7 @@ fn named_entities_to_phf(from: &Path, to: &Path) {
 
     // Add every missing prefix of those keys, mapping to NULL characters.
     for key in entities.keys().cloned().collect::<Vec<_>>() {
-        for n in 1 .. key.len() {
+        for n in 1..key.len() {
             entities.entry(&key[..n]).or_insert((0, 0));
         }
     }
diff --git a/collector/compile-benchmarks/piston-image/Cargo.lock b/collector/compile-benchmarks/piston-image/Cargo.lock
index 4eb07ba02..ab7ba48d0 100644
--- a/collector/compile-benchmarks/piston-image/Cargo.lock
+++ b/collector/compile-benchmarks/piston-image/Cargo.lock
@@ -1,6 +1,12 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
+
+[[package]]
+name = "autocfg"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ace50bade8e6234aa140d9a2f552bbee1db4d353f69b8217bc503490fc1a9f26"
 
 [[package]]
 name = "bitflags"
@@ -54,7 +60,7 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "be4551092f4d519593039259a9ed8daedf0da12e5109c5280338073eaeb81180"
 dependencies = [
- "num-traits",
+ "num-traits 0.1.40",
 ]
 
 [[package]]
@@ -113,7 +119,7 @@ dependencies = [
  "num-complex",
  "num-iter",
  "num-rational",
- "num-traits",
+ "num-traits 0.1.40",
  "png",
  "scoped_threadpool",
 ]
@@ -164,12 +170,13 @@ dependencies = [
 
 [[package]]
 name = "num-bigint"
-version = "0.1.40"
+version = "0.1.45"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fd0f8dbb4c0960998958a796281d88c16fbe68d87b1baa6f31e2979e81fd0bd"
+checksum = "1357c02fa1d647dd0769ef5bc2bf86281f064231c09c192a46c71246e3ec9258"
 dependencies = [
+ "autocfg",
  "num-integer",
- "num-traits",
+ "num-traits 0.2.19",
  "rand",
  "rustc-serialize",
 ]
@@ -180,17 +187,17 @@ version = "0.1.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "503e668405c5492d67cf662a81e05be40efe2e6bcf10f7794a07bd9865e704e6"
 dependencies = [
- "num-traits",
+ "num-traits 0.1.40",
  "rustc-serialize",
 ]
 
 [[package]]
 name = "num-integer"
-version = "0.1.35"
+version = "0.1.46"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d1452e8b06e448a07f0e6ebb0bb1d92b8890eea63288c0b627331d53514d0fba"
+checksum = "7969661fd2958a5cb096e56c8e1ad0444ac2bbcd0061bd28660485a44879858f"
 dependencies = [
- "num-traits",
+ "num-traits 0.2.19",
 ]
 
 [[package]]
@@ -200,18 +207,19 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7485fcc84f85b4ecd0ea527b14189281cf27d60e583ae65ebc9c088b13dffe01"
 dependencies = [
  "num-integer",
- "num-traits",
+ "num-traits 0.1.40",
 ]
 
 [[package]]
 name = "num-rational"
-version = "0.1.40"
+version = "0.1.43"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c7cb72a95250d8a370105c828f388932373e0e94414919891a0f945222310fe"
+checksum = "fbfff0773e8a07fb033d726b9ff1327466709820788e5298afce4d752965ff1e"
 dependencies = [
+ "autocfg",
  "num-bigint",
  "num-integer",
- "num-traits",
+ "num-traits 0.2.19",
  "rustc-serialize",
 ]
 
@@ -221,6 +229,15 @@ version = "0.1.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "99843c856d68d8b4313b03a17e33c4bb42ae8f6610ea81b28abe076ac721b9b0"
 
+[[package]]
+name = "num-traits"
+version = "0.2.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "071dfc062690e90b734c0b2273ce72ad0ffa95f0c74596bc250dcfd960262841"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "num_cpus"
 version = "1.7.0"