diff --git a/Cargo.lock b/Cargo.lock
index 3c88330c0f..1a9cf9ca20 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -585,7 +585,7 @@ dependencies = [
  "rustup-mock 0.6.0",
  "rustup-utils 0.6.0",
  "sha2 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "tar 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tar 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "toml 0.1.30 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -605,7 +605,7 @@ dependencies = [
  "rustup-utils 0.6.0",
  "scopeguard 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "sha2 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "tar 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tar 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "toml 0.1.30 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -722,12 +722,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "tar"
-version = "0.4.8"
+version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "filetime 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
- "xattr 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -939,14 +938,6 @@ dependencies = [
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "xattr"
-version = "0.1.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "libc 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [metadata]
 "checksum advapi32-sys 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "307c92332867e586720c0222ee9d890bbe8431711efed8a1b06bc5b40fc66bd7"
 "checksum advapi32-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e06588080cb19d0acb6739808aafa5f26bfb2ca015b2b6370028b44cf7cb8a9a"
@@ -1019,7 +1010,7 @@ dependencies = [
 "checksum shell32-sys 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "72f20b8f3c060374edb8046591ba28f62448c369ccbdc7b02075103fb3a9e38d"
 "checksum solicit 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)" = "172382bac9424588d7840732b250faeeef88942e37b6e35317dce98cafdd75b2"
 "checksum strsim 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0d5f575d5ced6634a5c4cb842163dab907dc7e9148b28dc482d81b8855cbe985"
-"checksum tar 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)" = "12e1b959f637c2e4c69dbdbf4d7dc609edbaada9b8c35d0c2fc9802d02383b65"
+"checksum tar 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "59a5014d9493d6c2799dff5da5d780c2f159bf368c54f115dbc421d02f1d5496"
 "checksum tempdir 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "0b62933a3f96cd559700662c34f8bab881d9e3540289fb4f368419c7f13a5aa9"
 "checksum tempfile 2.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "9270837a93bad1b1dac18fe67e786b3c960513af86231f6f4f57fddd594ff0c8"
 "checksum term 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)" = "3deff8a2b3b6607d6d7cc32ac25c0b33709453ca9cceac006caac51e963cf94a"
@@ -1047,4 +1038,3 @@ dependencies = [
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 "checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
 "checksum winreg 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "e63857fb213f619b4c4fff86b158285c76766aac7e7474967e92fb6dbbfeefe9"
-"checksum xattr 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "9f33a79798a952d99c15ed9348b11699135fc5f764cfca92c9b696b14208f72d"