diff --git a/Cargo.lock b/Cargo.lock
index fe20d7a3b..d9cbf754e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -534,15 +534,6 @@ dependencies = [
  "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "rand_os"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "getrandom 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "rand_xorshift"
 version = "0.2.0"
@@ -648,7 +639,6 @@ dependencies = [
  "protobuf 2.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "protobuf-codegen-pure 2.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_os 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_xorshift 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "subtle 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "zcash_primitives 0.1.0",
@@ -750,7 +740,6 @@ dependencies = [
 "checksum rand_chacha 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "03a2a90da8c7523f554344f921aa97283eadf6ac484a6d2a7d0212fa7f8d6853"
 "checksum rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
 "checksum rand_hc 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-"checksum rand_os 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "a788ae3edb696cfcba1c19bfd388cc4b8c21f8a408432b199c072825084da58a"
 "checksum rand_xorshift 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "77d416b86801d23dde1aa643023b775c3a462efc0ed96443add11546cdf1dca8"
 "checksum rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "138e3e0acb6c9fb258b19b67cb8abd63c00679d2851805ea151465464fe9030a"
 "checksum scopeguard 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b42e15e59b18a828bbf5c58ea01debb36b9b096346de35d941dcb89009f24a0d"
diff --git a/zcash_client_backend/Cargo.toml b/zcash_client_backend/Cargo.toml
index 3c8a01431..3e472fd30 100644
--- a/zcash_client_backend/Cargo.toml
+++ b/zcash_client_backend/Cargo.toml
@@ -25,7 +25,6 @@ protobuf-codegen-pure = "2"
 
 [dev-dependencies]
 rand_core = "0.5"
-rand_os = "0.2"
 rand_xorshift = "0.2"
 
 [badges]