diff --git a/Cargo.lock b/Cargo.lock
index c90dbd4960..5d30a24aa1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -32,13 +32,13 @@ name = "coco"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "either 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "either 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "either"
-version = "1.3.0"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -312,7 +312,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "smoltcp"
 version = "0.4.0"
-source = "git+https://github.com/m-labs/smoltcp.git#907f3659a43a1c1e1bbce68e8b9de9ab0ce6dac3"
+source = "git+https://github.com/m-labs/smoltcp.git#5e2ae22302d36cea2cc3e1caa4f098e20dc7f612"
 dependencies = [
  "byteorder 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "managed 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -426,7 +426,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum byteorder 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "0fc10e8cc6b2580fda3f36eb6dc5316657f812a3df879a44a66fc9f0fdbc4855"
 "checksum byteorder 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ff81738b726f5d099632ceaffe7fb65b90212e8dce59d518729e7e8634032d3d"
 "checksum coco 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "c06169f5beb7e31c7c67ebf5540b8b472d23e3eade3b2ec7d1f5b504a85f91bd"
-"checksum either 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e311a7479512fbdf858fb54d91ec59f3b9f85bc0113659f46bba12b199d273ce"
+"checksum either 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "740178ddf48b1a9e878e6d6509a1442a2d42fd2928aae8e7a6f8a36fb01981b3"
 "checksum extra 0.1.0 (git+https://github.com/redox-os/libextra.git)" = "<none>"
 "checksum fuchsia-zircon 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "f6c0581a4e363262e52b87f59ee2afe3415361c6ec35e665924eb08afe8ff159"
 "checksum fuchsia-zircon-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "43f3795b4bae048dc6123a6b972cadde2e676f9ded08aef6bb77f5f157684a82"