diff --git a/Cargo.lock b/Cargo.lock
index 781bfea05f6..eb2efec0997 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -8,7 +8,7 @@ dependencies = [
  "crates-io 0.10.0",
  "crossbeam 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "curl 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "docopt 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "docopt 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "error-chain 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "filetime 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -18,6 +18,7 @@ dependencies = [
  "git2-curl 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "hamcrest 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hex 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "jobserver 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -27,7 +28,6 @@ dependencies = [
  "num_cpus 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl 0.9.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "psapi-sys 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "scoped-tls 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "semver 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -111,10 +111,10 @@ dependencies = [
  "flate2 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "git2 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "hamcrest 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hex 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tar 0.4.13 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -191,12 +191,13 @@ dependencies = [
 
 [[package]]
 name = "docopt"
-version = "0.7.0"
+version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "strsim 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -306,6 +307,11 @@ dependencies = [
  "regex 0.1.80 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "hex"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "idna"
 version = "0.1.2"
@@ -883,7 +889,7 @@ dependencies = [
 "checksum curl 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c90e1240ef340dd4027ade439e5c7c2064dd9dc652682117bd50d1486a3add7b"
 "checksum curl-sys 0.3.12 (registry+https://github.com/rust-lang/crates.io-index)" = "f00c8ba847fb0730c293069b4d1203dc01bf3c2e1f90b4e55f426ed8f4a1eeac"
 "checksum dbghelp-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "97590ba53bcb8ac28279161ca943a924d1fd4a8fb3fa63302591647c4fc5b850"
-"checksum docopt 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ab32ea6e284d87987066f21a9e809a73c14720571ef34516f0890b3d355ccfd8"
+"checksum docopt 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "63e408eee8a772c5c61f62353992e3ebf51ef5c832dd04d986b3dc7d48c5b440"
 "checksum dtoa 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "80c8b71fd71146990a9742fc06dcbbde19161a267e0ad4e572c35162f4578c90"
 "checksum env_logger 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "3ddf21e73e016298f5cb37d6ef8e8da8e39f91f9ec8b0df44b7deb16a9f8cd5b"
 "checksum error-chain 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d9435d864e017c3c6afeac1654189b06cdb491cf2ff73dbf0d73b0f292f42ff8"
@@ -897,6 +903,7 @@ dependencies = [
 "checksum git2-curl 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "68676bc784bf0bef83278898929bf64a251e87c0340723d0b93fa096c9c5bf8e"
 "checksum glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "8be18de09a56b60ed0edf84bc9df007e30040691af7acd1c41874faac5895bfb"
 "checksum hamcrest 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "bf088f042a467089e9baa4972f57f9247e42a0cc549ba264c7a04fbb8ecb89d4"
+"checksum hex 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d6a22814455d41612f41161581c2883c0c6a1c41852729b17d5ed88f01e153aa"
 "checksum idna 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "2233d4940b1f19f0418c158509cd7396b8d70a5db5705ce410914dc8fa603b37"
 "checksum itoa 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "eb2f404fbc66fd9aac13e998248505e7ecb2ad8e44ab6388684c5fb11c6c251c"
 "checksum jobserver 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "c43fc6e4066b2adf0539c854daa1d926d7f23e6926e019850d34b8ae46391b2e"
diff --git a/Cargo.toml b/Cargo.toml
index 3435b05a51a..26401fbd40e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,7 +20,7 @@ path = "src/cargo/lib.rs"
 crates-io = { path = "src/crates-io", version = "0.10" }
 crossbeam = "0.2"
 curl = "0.4.6"
-docopt = "0.7"
+docopt = "0.8"
 env_logger = "0.4"
 error-chain = "0.10.0"
 filetime = "0.1"
@@ -29,12 +29,12 @@ fs2 = "0.4"
 git2 = "0.6"
 git2-curl = "0.7"
 glob = "0.2"
+hex = "0.2"
 jobserver = "0.1.4"
 libc = "0.2"
 libgit2-sys = "0.6"
 log = "0.3"
 num_cpus = "1.0"
-rustc-serialize = "0.3"
 scoped-tls = "0.1"
 semver = { version = "0.7.0", features = ["serde"] }
 serde = "1.0"
diff --git a/src/bin/bench.rs b/src/bin/bench.rs
index c58ff5c087d..9e34f784725 100644
--- a/src/bin/bench.rs
+++ b/src/bin/bench.rs
@@ -3,7 +3,7 @@ use cargo::ops::{self, MessageFormat, Packages};
 use cargo::util::{CliResult, CliError, Config, CargoErrorKind};
 use cargo::util::important_paths::{find_root_manifest_for_wd};
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     flag_no_run: bool,
     flag_package: Vec<String>,
diff --git a/src/bin/build.rs b/src/bin/build.rs
index 759c2746646..c679fc50f06 100644
--- a/src/bin/build.rs
+++ b/src/bin/build.rs
@@ -5,7 +5,7 @@ use cargo::ops::{self, CompileOptions, MessageFormat, Packages};
 use cargo::util::important_paths::{find_root_manifest_for_wd};
 use cargo::util::{CliResult, Config};
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     flag_package: Vec<String>,
     flag_jobs: Option<u32>,
diff --git a/src/bin/cargo.rs b/src/bin/cargo.rs
index 23085116d02..ae4409723d4 100644
--- a/src/bin/cargo.rs
+++ b/src/bin/cargo.rs
@@ -2,7 +2,6 @@ extern crate cargo;
 extern crate url;
 extern crate env_logger;
 extern crate git2_curl;
-extern crate rustc_serialize;
 extern crate toml;
 #[macro_use]
 extern crate log;
@@ -20,7 +19,7 @@ use cargo::core::shell::{Verbosity, ColorConfig};
 use cargo::util::{self, CliResult, lev_distance, Config, CargoResult, CargoError, CargoErrorKind};
 use cargo::util::CliError;
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Flags {
     flag_list: bool,
     flag_version: bool,
diff --git a/src/bin/check.rs b/src/bin/check.rs
index 147ff43b9a9..fd36f542000 100644
--- a/src/bin/check.rs
+++ b/src/bin/check.rs
@@ -49,7 +49,7 @@ the manifest. The default profile for this command is `dev`, but passing
 the --release flag will use the `release` profile instead.
 ";
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     flag_package: Vec<String>,
     flag_jobs: Option<u32>,
diff --git a/src/bin/clean.rs b/src/bin/clean.rs
index 8903f890312..661425e9e37 100644
--- a/src/bin/clean.rs
+++ b/src/bin/clean.rs
@@ -5,7 +5,7 @@ use cargo::ops;
 use cargo::util::{CliResult, Config};
 use cargo::util::important_paths::{find_root_manifest_for_wd};
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     flag_package: Vec<String>,
     flag_target: Option<String>,
diff --git a/src/bin/doc.rs b/src/bin/doc.rs
index 11e44670faf..6b4190985df 100644
--- a/src/bin/doc.rs
+++ b/src/bin/doc.rs
@@ -3,7 +3,7 @@ use cargo::ops::{self, MessageFormat, Packages};
 use cargo::util::{CliResult, Config};
 use cargo::util::important_paths::{find_root_manifest_for_wd};
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     flag_target: Option<String>,
     flag_features: Vec<String>,
diff --git a/src/bin/fetch.rs b/src/bin/fetch.rs
index 80aba98db92..6b61ba7d689 100644
--- a/src/bin/fetch.rs
+++ b/src/bin/fetch.rs
@@ -3,7 +3,7 @@ use cargo::ops;
 use cargo::util::{CliResult, Config};
 use cargo::util::important_paths::find_root_manifest_for_wd;
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     flag_manifest_path: Option<String>,
     flag_verbose: u32,
diff --git a/src/bin/generate_lockfile.rs b/src/bin/generate_lockfile.rs
index f545b1e26f7..60cb6c6566a 100644
--- a/src/bin/generate_lockfile.rs
+++ b/src/bin/generate_lockfile.rs
@@ -5,7 +5,7 @@ use cargo::ops;
 use cargo::util::{CliResult, Config};
 use cargo::util::important_paths::find_root_manifest_for_wd;
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     flag_manifest_path: Option<String>,
     flag_verbose: u32,
diff --git a/src/bin/git_checkout.rs b/src/bin/git_checkout.rs
index 4309f0163fe..4841b5e4ea6 100644
--- a/src/bin/git_checkout.rs
+++ b/src/bin/git_checkout.rs
@@ -2,7 +2,7 @@ use cargo::core::source::{Source, SourceId, GitReference};
 use cargo::sources::git::{GitSource};
 use cargo::util::{Config, CliResult, ToUrl};
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     flag_url: String,
     flag_reference: String,
diff --git a/src/bin/help.rs b/src/bin/help.rs
index f59e24f3ebd..c5059e4ff5e 100644
--- a/src/bin/help.rs
+++ b/src/bin/help.rs
@@ -1,6 +1,6 @@
 use cargo::util::{CliResult, CliError, Config};
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options;
 
 pub const USAGE: &'static str = "
diff --git a/src/bin/init.rs b/src/bin/init.rs
index 97dca61c9fe..be02789ec55 100644
--- a/src/bin/init.rs
+++ b/src/bin/init.rs
@@ -3,7 +3,7 @@ use std::env;
 use cargo::ops;
 use cargo::util::{CliResult, Config};
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     flag_verbose: u32,
     flag_quiet: Option<bool>,
diff --git a/src/bin/install.rs b/src/bin/install.rs
index 197dcdd1be0..8d532e6bc1c 100644
--- a/src/bin/install.rs
+++ b/src/bin/install.rs
@@ -2,7 +2,7 @@ use cargo::ops;
 use cargo::core::{SourceId, GitReference};
 use cargo::util::{CliResult, Config, ToUrl};
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     flag_jobs: Option<u32>,
     flag_features: Vec<String>,
diff --git a/src/bin/locate_project.rs b/src/bin/locate_project.rs
index 7c7727aa221..e0c6164e7c7 100644
--- a/src/bin/locate_project.rs
+++ b/src/bin/locate_project.rs
@@ -2,7 +2,7 @@ use cargo;
 use cargo::util::{CliResult, CliError, Config};
 use cargo::util::important_paths::{find_root_manifest_for_wd};
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct LocateProjectFlags {
     flag_manifest_path: Option<String>,
 }
diff --git a/src/bin/login.rs b/src/bin/login.rs
index 6e7841717b6..a9d6b1a710a 100644
--- a/src/bin/login.rs
+++ b/src/bin/login.rs
@@ -6,7 +6,7 @@ use cargo::core::{SourceId, Source};
 use cargo::sources::RegistrySource;
 use cargo::util::{CliResult, CargoResultExt, Config};
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     flag_host: Option<String>,
     arg_token: Option<String>,
diff --git a/src/bin/metadata.rs b/src/bin/metadata.rs
index 00d46c0059d..0811535307b 100644
--- a/src/bin/metadata.rs
+++ b/src/bin/metadata.rs
@@ -4,7 +4,7 @@ use cargo::ops::{output_metadata, OutputMetadataOptions};
 use cargo::util::important_paths::find_root_manifest_for_wd;
 use cargo::util::{CliResult, Config};
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     flag_color: Option<String>,
     flag_features: Vec<String>,
diff --git a/src/bin/new.rs b/src/bin/new.rs
index aeee334a965..bcf446c967c 100644
--- a/src/bin/new.rs
+++ b/src/bin/new.rs
@@ -3,7 +3,7 @@ use std::env;
 use cargo::ops;
 use cargo::util::{CliResult, Config};
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     flag_verbose: u32,
     flag_quiet: Option<bool>,
diff --git a/src/bin/owner.rs b/src/bin/owner.rs
index 288d13e302c..587a968a6bf 100644
--- a/src/bin/owner.rs
+++ b/src/bin/owner.rs
@@ -1,7 +1,7 @@
 use cargo::ops;
 use cargo::util::{CliResult, Config};
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     arg_crate: Option<String>,
     flag_token: Option<String>,
diff --git a/src/bin/package.rs b/src/bin/package.rs
index df342fbf8bf..e4c4af44968 100644
--- a/src/bin/package.rs
+++ b/src/bin/package.rs
@@ -3,7 +3,7 @@ use cargo::ops;
 use cargo::util::{CliResult, Config};
 use cargo::util::important_paths::find_root_manifest_for_wd;
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     flag_verbose: u32,
     flag_quiet: Option<bool>,
diff --git a/src/bin/pkgid.rs b/src/bin/pkgid.rs
index ea573361d9e..f8574139458 100644
--- a/src/bin/pkgid.rs
+++ b/src/bin/pkgid.rs
@@ -3,7 +3,7 @@ use cargo::ops;
 use cargo::util::{CliResult, Config};
 use cargo::util::important_paths::{find_root_manifest_for_wd};
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     flag_verbose: u32,
     flag_quiet: Option<bool>,
diff --git a/src/bin/publish.rs b/src/bin/publish.rs
index dcba4df07e2..3f0af0baaf7 100644
--- a/src/bin/publish.rs
+++ b/src/bin/publish.rs
@@ -3,7 +3,7 @@ use cargo::ops;
 use cargo::util::{CliResult, Config};
 use cargo::util::important_paths::find_root_manifest_for_wd;
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     flag_host: Option<String>,
     flag_token: Option<String>,
diff --git a/src/bin/read_manifest.rs b/src/bin/read_manifest.rs
index 07c4a5f2c45..c97456757d5 100644
--- a/src/bin/read_manifest.rs
+++ b/src/bin/read_manifest.rs
@@ -5,7 +5,7 @@ use cargo::core::Package;
 use cargo::util::{CliResult, Config};
 use cargo::util::important_paths::{find_root_manifest_for_wd};
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     flag_manifest_path: Option<String>,
     flag_color: Option<String>,
diff --git a/src/bin/run.rs b/src/bin/run.rs
index 96c51bea240..3ff26fc6212 100644
--- a/src/bin/run.rs
+++ b/src/bin/run.rs
@@ -5,7 +5,7 @@ use cargo::ops::{self, MessageFormat, Packages};
 use cargo::util::{CliResult, CliError, Config, CargoErrorKind};
 use cargo::util::important_paths::{find_root_manifest_for_wd};
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     flag_bin: Option<String>,
     flag_example: Option<String>,
diff --git a/src/bin/rustc.rs b/src/bin/rustc.rs
index 3ee18a86234..0616e6f5e08 100644
--- a/src/bin/rustc.rs
+++ b/src/bin/rustc.rs
@@ -5,7 +5,7 @@ use cargo::ops::{self, CompileOptions, CompileMode, MessageFormat, Packages};
 use cargo::util::important_paths::{find_root_manifest_for_wd};
 use cargo::util::{CliResult, CliError, Config};
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     arg_opts: Option<Vec<String>>,
     flag_package: Option<String>,
diff --git a/src/bin/rustdoc.rs b/src/bin/rustdoc.rs
index b6a8e640e2b..55ce9c89d61 100644
--- a/src/bin/rustdoc.rs
+++ b/src/bin/rustdoc.rs
@@ -3,7 +3,7 @@ use cargo::ops::{self, MessageFormat, Packages};
 use cargo::util::{CliResult, Config};
 use cargo::util::important_paths::{find_root_manifest_for_wd};
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     arg_opts: Vec<String>,
     flag_target: Option<String>,
diff --git a/src/bin/search.rs b/src/bin/search.rs
index 47879cae582..c9794ad3e41 100644
--- a/src/bin/search.rs
+++ b/src/bin/search.rs
@@ -3,7 +3,7 @@ use cargo::util::{CliResult, Config};
 
 use std::cmp;
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     flag_host: Option<String>,
     flag_verbose: u32,
diff --git a/src/bin/test.rs b/src/bin/test.rs
index 5fbae53f373..fe8d5757f8c 100644
--- a/src/bin/test.rs
+++ b/src/bin/test.rs
@@ -3,7 +3,7 @@ use cargo::ops::{self, MessageFormat, Packages};
 use cargo::util::{CliResult, CliError, Config, CargoErrorKind};
 use cargo::util::important_paths::find_root_manifest_for_wd;
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     arg_args: Vec<String>,
     flag_features: Vec<String>,
diff --git a/src/bin/uninstall.rs b/src/bin/uninstall.rs
index 725452251e1..619b029f511 100644
--- a/src/bin/uninstall.rs
+++ b/src/bin/uninstall.rs
@@ -1,7 +1,7 @@
 use cargo::ops;
 use cargo::util::{CliResult, Config};
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     flag_bin: Vec<String>,
     flag_root: Option<String>,
diff --git a/src/bin/update.rs b/src/bin/update.rs
index e8da2bd5cbc..1890ab7cc61 100644
--- a/src/bin/update.rs
+++ b/src/bin/update.rs
@@ -5,7 +5,7 @@ use cargo::ops;
 use cargo::util::{CliResult, Config};
 use cargo::util::important_paths::find_root_manifest_for_wd;
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     flag_package: Vec<String>,
     flag_aggressive: bool,
diff --git a/src/bin/verify_project.rs b/src/bin/verify_project.rs
index 26e11f96644..ea03bdd58c4 100644
--- a/src/bin/verify_project.rs
+++ b/src/bin/verify_project.rs
@@ -9,7 +9,7 @@ use cargo::util::{CliResult, Config};
 use serde_json;
 use toml;
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Flags {
     flag_manifest_path: Option<String>,
     flag_verbose: u32,
diff --git a/src/bin/version.rs b/src/bin/version.rs
index 9724481036a..a97c0fc0300 100644
--- a/src/bin/version.rs
+++ b/src/bin/version.rs
@@ -3,8 +3,8 @@ use std::env;
 use cargo;
 use cargo::util::{CliResult, Config};
 
-#[derive(RustcDecodable)]
-pub struct Options;
+#[derive(Deserialize)]
+pub struct Options {}
 
 pub const USAGE: &'static str = "
 Show version information
diff --git a/src/bin/yank.rs b/src/bin/yank.rs
index 9e5663684ab..de48639ecff 100644
--- a/src/bin/yank.rs
+++ b/src/bin/yank.rs
@@ -1,7 +1,7 @@
 use cargo::ops;
 use cargo::util::{CliResult, Config};
 
-#[derive(RustcDecodable)]
+#[derive(Deserialize)]
 pub struct Options {
     arg_crate: Option<String>,
     flag_token: Option<String>,
diff --git a/src/cargo/lib.rs b/src/cargo/lib.rs
index 2fe2a572b13..38ebe82ae52 100755
--- a/src/cargo/lib.rs
+++ b/src/cargo/lib.rs
@@ -17,11 +17,11 @@ extern crate flate2;
 extern crate fs2;
 extern crate git2;
 extern crate glob;
+extern crate hex;
 extern crate jobserver;
 extern crate libc;
 extern crate libgit2_sys;
 extern crate num_cpus;
-extern crate rustc_serialize;
 extern crate semver;
 extern crate serde;
 extern crate serde_ignored;
@@ -37,7 +37,7 @@ use std::fmt;
 use std::error::Error;
 
 use error_chain::ChainedError;
-use rustc_serialize::Decodable;
+use serde::Deserialize;
 use serde::ser;
 use docopt::Docopt;
 
@@ -105,7 +105,7 @@ impl fmt::Display for VersionInfo {
     }
 }
 
-pub fn call_main_without_stdin<Flags: Decodable>(
+pub fn call_main_without_stdin<'de, Flags: Deserialize<'de>>(
             exec: fn(Flags, &Config) -> CliResult,
             config: &Config,
             usage: &str,
@@ -117,7 +117,7 @@ pub fn call_main_without_stdin<Flags: Decodable>(
         .argv(args.iter().map(|s| &s[..]))
         .help(true);
 
-    let flags = docopt.decode().map_err(|e| {
+    let flags = docopt.deserialize().map_err(|e| {
         let code = if e.fatal() {1} else {0};
         CliError::new(e.to_string().into(), code)
     })?;
diff --git a/src/cargo/ops/cargo_compile.rs b/src/cargo/ops/cargo_compile.rs
index 888939a2203..377fc8bc73e 100644
--- a/src/cargo/ops/cargo_compile.rs
+++ b/src/cargo/ops/cargo_compile.rs
@@ -96,7 +96,7 @@ pub enum CompileMode {
     Doctest,
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, RustcDecodable)]
+#[derive(Clone, Copy, PartialEq, Eq, Deserialize)]
 pub enum MessageFormat {
     Human,
     Json
diff --git a/src/cargo/ops/cargo_new.rs b/src/cargo/ops/cargo_new.rs
index 846e7c0d444..ad049e494e4 100644
--- a/src/cargo/ops/cargo_new.rs
+++ b/src/cargo/ops/cargo_new.rs
@@ -3,7 +3,8 @@ use std::fs;
 use std::path::Path;
 use std::collections::BTreeMap;
 
-use rustc_serialize::{Decodable, Decoder};
+use serde::{Deserialize, Deserializer};
+use serde::de;
 
 use git2::Config as GitConfig;
 use git2::Repository as GitRepository;
@@ -43,16 +44,17 @@ struct MkOptions<'a> {
     bin: bool,
 }
 
-impl Decodable for VersionControl {
-    fn decode<D: Decoder>(d: &mut D) -> Result<VersionControl, D::Error> {
-        Ok(match &d.read_str()?[..] {
+impl<'de> Deserialize<'de> for VersionControl {
+    fn deserialize<D: Deserializer<'de>>(d: D) -> Result<VersionControl, D::Error> {
+        Ok(match &String::deserialize(d)?[..] {
             "git" => VersionControl::Git,
             "hg" => VersionControl::Hg,
             "pijul" => VersionControl::Pijul,
             "none" => VersionControl::NoVcs,
             n => {
-                let err = format!("could not decode '{}' as version control", n);
-                return Err(d.error(&err));
+                let value = de::Unexpected::Str(n);
+                let msg = "unsupported version control system";
+                return Err(de::Error::invalid_value(value, &msg));
             }
         })
     }
diff --git a/src/cargo/sources/directory.rs b/src/cargo/sources/directory.rs
index d0461315611..bf025177875 100644
--- a/src/cargo/sources/directory.rs
+++ b/src/cargo/sources/directory.rs
@@ -4,7 +4,8 @@ use std::fs::File;
 use std::io::Read;
 use std::path::{Path, PathBuf};
 
-use rustc_serialize::hex::ToHex;
+use hex::ToHex;
+
 use serde_json;
 
 use core::{Package, PackageId, Summary, SourceId, Source, Dependency, Registry};
diff --git a/src/cargo/sources/registry/local.rs b/src/cargo/sources/registry/local.rs
index 203f3bc2560..5803fd77d94 100644
--- a/src/cargo/sources/registry/local.rs
+++ b/src/cargo/sources/registry/local.rs
@@ -2,9 +2,8 @@ use std::io::SeekFrom;
 use std::io::prelude::*;
 use std::path::Path;
 
-use rustc_serialize::hex::ToHex;
-
 use core::PackageId;
+use hex::ToHex;
 use sources::registry::{RegistryData, RegistryConfig};
 use util::FileLock;
 use util::paths;
diff --git a/src/cargo/sources/registry/remote.rs b/src/cargo/sources/registry/remote.rs
index 37b776b6d15..2f9f7c87e56 100644
--- a/src/cargo/sources/registry/remote.rs
+++ b/src/cargo/sources/registry/remote.rs
@@ -6,7 +6,7 @@ use std::path::Path;
 
 use curl::easy::{Easy, List};
 use git2;
-use rustc_serialize::hex::ToHex;
+use hex::ToHex;
 use serde_json;
 use url::Url;
 
diff --git a/src/cargo/util/config.rs b/src/cargo/util/config.rs
index fa1f07c6bfe..32976225b76 100644
--- a/src/cargo/util/config.rs
+++ b/src/cargo/util/config.rs
@@ -15,7 +15,7 @@ use std::sync::{Once, ONCE_INIT};
 use core::MultiShell;
 use core::shell::{Verbosity, ColorConfig};
 use jobserver;
-use rustc_serialize::{Encodable,Encoder};
+use serde::{Serialize, Serializer};
 use toml;
 use util::Rustc;
 use util::errors::{CargoResult, CargoResultExt, CargoError, internal};
@@ -572,17 +572,17 @@ impl fmt::Debug for ConfigValue {
     }
 }
 
-impl Encodable for ConfigValue {
-    fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
+impl Serialize for ConfigValue {
+    fn serialize<S: Serializer>(&self, s: S) -> Result<S::Ok, S::Error> {
         match *self {
-            CV::String(ref string, _) => string.encode(s),
+            CV::String(ref string, _) => string.serialize(s),
             CV::List(ref list, _) => {
                 let list: Vec<&String> = list.iter().map(|s| &s.0).collect();
-                list.encode(s)
+                list.serialize(s)
             }
-            CV::Table(ref table, _) => table.encode(s),
-            CV::Boolean(b, _) => b.encode(s),
-            CV::Integer(i, _) => i.encode(s),
+            CV::Table(ref table, _) => table.serialize(s),
+            CV::Boolean(b, _) => b.serialize(s),
+            CV::Integer(i, _) => i.serialize(s),
         }
     }
 }
diff --git a/src/cargo/util/hex.rs b/src/cargo/util/hex.rs
index 28fed76fc0f..71a4c112fd3 100644
--- a/src/cargo/util/hex.rs
+++ b/src/cargo/util/hex.rs
@@ -1,9 +1,8 @@
 #![allow(deprecated)]
 
+use hex::ToHex;
 use std::hash::{Hasher, Hash, SipHasher};
 
-use rustc_serialize::hex::ToHex;
-
 pub fn to_hex(num: u64) -> String {
     [
         (num >>  0) as u8,
diff --git a/tests/cargotest/Cargo.toml b/tests/cargotest/Cargo.toml
index e5c29f95ddd..f5b1cc8ca30 100644
--- a/tests/cargotest/Cargo.toml
+++ b/tests/cargotest/Cargo.toml
@@ -13,10 +13,10 @@ filetime = "0.1"
 flate2 = "0.2"
 git2 = { version = "0.6", default-features = false }
 hamcrest = "=0.1.1"
+hex = "0.2"
 kernel32-sys = "0.2"
 libc = "0.2"
 log = "0.3"
-rustc-serialize = "0.3"
 serde = "1.0"
 serde_json = "1.0"
 tar = { version = "0.4", default-features = false }
diff --git a/tests/cargotest/lib.rs b/tests/cargotest/lib.rs
index 33e58c0e2e5..919768c1887 100644
--- a/tests/cargotest/lib.rs
+++ b/tests/cargotest/lib.rs
@@ -6,8 +6,8 @@ extern crate filetime;
 extern crate flate2;
 extern crate git2;
 extern crate hamcrest;
+extern crate hex;
 extern crate libc;
-extern crate rustc_serialize;
 extern crate serde;
 #[macro_use]
 extern crate serde_json;
diff --git a/tests/cargotest/support/registry.rs b/tests/cargotest/support/registry.rs
index 3eae9432992..49ab9390175 100644
--- a/tests/cargotest/support/registry.rs
+++ b/tests/cargotest/support/registry.rs
@@ -6,7 +6,7 @@ use std::path::{PathBuf, Path};
 use flate2::Compression::Default;
 use flate2::write::GzEncoder;
 use git2;
-use rustc_serialize::hex::ToHex;
+use hex::ToHex;
 use tar::{Builder, Header};
 use url::Url;
 
diff --git a/tests/directory.rs b/tests/directory.rs
index 8ff54c1476e..96c520f5f7c 100644
--- a/tests/directory.rs
+++ b/tests/directory.rs
@@ -1,15 +1,15 @@
 #[macro_use]
 extern crate cargotest;
 extern crate hamcrest;
-extern crate rustc_serialize;
+#[macro_use]
+extern crate serde_derive;
+extern crate serde_json;
 
 use std::collections::HashMap;
 use std::fs::{self, File};
 use std::io::prelude::*;
 use std::str;
 
-use rustc_serialize::json;
-
 use cargotest::cargo_process;
 use cargotest::support::{project, execs, ProjectBuilder};
 use cargotest::support::paths;
@@ -33,7 +33,7 @@ struct VendorPackage {
     cksum: Checksum,
 }
 
-#[derive(RustcEncodable)]
+#[derive(Serialize)]
 struct Checksum {
     package: String,
     files: HashMap<String, String>,
@@ -58,7 +58,7 @@ impl VendorPackage {
 
     fn build(&mut self) {
         let p = self.p.take().unwrap();
-        let json = json::encode(&self.cksum).unwrap();
+        let json = serde_json::to_string(&self.cksum).unwrap();
         let p = p.file(".cargo-checksum.json", &json);
         p.build();
     }
diff --git a/tests/version.rs b/tests/version.rs
index bc8c0c1b94c..57844c90a7c 100644
--- a/tests/version.rs
+++ b/tests/version.rs
@@ -1,7 +1,6 @@
 extern crate cargo;
 extern crate cargotest;
 extern crate hamcrest;
-extern crate rustc_serialize;
 
 use cargotest::support::{project, execs};
 use hamcrest::assert_that;