diff --git a/Cargo.lock b/Cargo.lock
index 85b1344..164652f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -284,6 +284,7 @@ checksum = "360e552c93fa0e8152ab463bc4c4837fce76a225df11dfaeea66c313de5e61f7"
 dependencies = [
  "bitflags",
  "libc",
+ "redox_syscall",
 ]
 
 [[package]]
@@ -521,11 +522,20 @@ version = "5.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "69cdb34c158ceb288df11e18b4bd39de994f6657d83847bdffdbd7f346754b0f"
 
+[[package]]
+name = "redox_syscall"
+version = "0.5.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5407465600fb0548f1442edf71dd20683c6ed326200ace4b1ef0763521bb3b77"
+dependencies = [
+ "bitflags",
+]
+
 [[package]]
 name = "redox_users"
-version = "0.5.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd6f9d3d47bdd2ad6945c5015a226ec6155d0bcdfd8f7cd29f86b71f8de99d2b"
+checksum = "78eaea1f52c56d57821be178b2d47e09ff26481a6042e8e042fcb0ced068b470"
 dependencies = [
  "getrandom 0.2.16",
  "libredox",