diff --git a/Cargo.lock b/Cargo.lock
index 6b6951202..78a8d472f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -810,7 +810,6 @@ dependencies = [
  "rlp 0.2.0",
  "rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/util/network/Cargo.toml b/util/network/Cargo.toml
index 19afb8130..e99df9024 100644
--- a/util/network/Cargo.toml
+++ b/util/network/Cargo.toml
@@ -21,7 +21,6 @@ libc = "0.2.7"
 parking_lot = "0.4"
 ansi_term = "0.9"
 rustc-hex = "1.0"
-rustc-serialize = "0.3"
 ethcore-io = { path = "../io" }
 ethcore-util = { path = ".." }
 ethcore-bigint = { path = "../bigint" }