diff --git a/Cargo.lock b/Cargo.lock
index 47b19ae11..dda464516 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2237,7 +2237,7 @@ dependencies = [
  "parity-version 1.11.0",
  "parking_lot 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "path 0.1.0",
- "rand 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "semver 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "target_info 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",