diff --git a/Cargo.lock b/Cargo.lock
index e3adea9a732..43498a104f8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -11,13 +11,13 @@ dependencies = [
  "env_logger 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "filetime 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "flate2 0.2.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "git2 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "git2-curl 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "git2 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "git2-curl 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "glob 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "hamcrest 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "kernel32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libgit2-sys 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libgit2-sys 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 0.1.48 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -155,24 +155,24 @@ dependencies = [
 
 [[package]]
 name = "git2"
-version = "0.3.4"
+version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libgit2-sys 0.3.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 0.2.38 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libgit2-sys 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "git2-curl"
-version = "0.3.0"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "curl 0.2.16 (registry+https://github.com/rust-lang/crates.io-index)",
- "git2 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "git2 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 0.2.38 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -204,7 +204,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libgit2-sys"
-version = "0.3.11"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cmake 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -410,6 +410,19 @@ dependencies = [
  "rustc-serialize 0.3.18 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "unicode-bidi"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "matches 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "unicode-normalization"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "url"
 version = "0.2.38"
@@ -420,6 +433,18 @@ dependencies = [
  "uuid 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "url"
+version = "0.5.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "matches 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-serialize 0.3.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-bidi 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-normalization 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "uuid 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "user32-sys"
 version = "0.1.2"
diff --git a/Cargo.toml b/Cargo.toml
index 2f272b4a540..f54c4f138ff 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -25,12 +25,12 @@ docopt = "0.6"
 env_logger = "0.3"
 filetime = "0.1"
 flate2 = "0.2"
-git2 = "0.3"
-git2-curl = "0.3"
+git2 = "0.4"
+git2-curl = "0.4"
 glob = "0.2"
 kernel32-sys = "0.2"
 libc = "0.2"
-libgit2-sys = "0.3"
+libgit2-sys = "0.4"
 log = "0.3"
 num_cpus = "0.2"
 regex = "0.1"