diff --git a/Cargo.lock b/Cargo.lock
index b6c0b3ef6..36c723bbd 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2658,7 +2658,6 @@ dependencies = [
  "jsonrpc-pubsub 10.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "jsonrpc-ws-server 10.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "kvdb-memorydb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "macros 0.1.0",
  "multihash 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2683,7 +2682,6 @@ dependencies = [
  "tokio-timer 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "transaction-pool 1.13.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "transient-hashmap 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "trie-db 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "vm 0.1.0",
 ]
 
diff --git a/rpc/Cargo.toml b/rpc/Cargo.toml
index c6c59dc15..aea96f663 100644
--- a/rpc/Cargo.toml
+++ b/rpc/Cargo.toml
@@ -38,7 +38,6 @@ common-types = { path = "../ethcore/types" }
 ethash = { path = "../ethash" }
 ethcore = { path = "../ethcore", features = ["test-helpers"] }
 ethcore-accounts = { path = "../accounts", optional = true }
-ethcore-io = { path = "../util/io" }
 ethcore-light = { path = "../ethcore/light" }
 ethcore-logger = { path = "../parity/logger" }
 ethcore-miner = { path = "../miner" }
@@ -59,7 +58,6 @@ keccak-hash = "0.1.2"
 parity-runtime = { path = "../util/runtime" }
 parity-updater = { path = "../updater" }
 parity-version = { path = "../util/version" }
-trie-db = "0.11.0"
 rlp = { version = "0.3.0", features = ["ethereum"] }
 stats = { path = "../util/stats" }
 vm = { path = "../ethcore/vm" }
@@ -67,9 +65,9 @@ vm = { path = "../ethcore/vm" }
 [dev-dependencies]
 ethcore = { path = "../ethcore", features = ["test-helpers"] }
 ethcore-accounts = { path = "../accounts" }
+ethcore-io = { path = "../util/io" }
 ethcore-network = { path = "../util/network" }
 fake-fetch = { path = "../util/fake-fetch" }
-kvdb-memorydb = "0.1"
 macros = { path = "../util/macros" }
 pretty_assertions = "0.1"
 transaction-pool = "1.13"
diff --git a/rpc/src/lib.rs b/rpc/src/lib.rs
index 4a90fbe69..cafd7a8e4 100644
--- a/rpc/src/lib.rs
+++ b/rpc/src/lib.rs
@@ -16,7 +16,7 @@
 
 //! Parity RPC.
 
-#![warn(missing_docs)]
+#![warn(missing_docs, unused_extern_crates)]
 
 #[macro_use]
 extern crate futures;
@@ -32,7 +32,6 @@ extern crate rustc_hex;
 extern crate semver;
 extern crate serde;
 extern crate serde_json;
-extern crate tiny_keccak;
 extern crate tokio_timer;
 extern crate transient_hashmap;
 
@@ -48,7 +47,6 @@ extern crate ethcore;
 extern crate fastmap;
 extern crate parity_bytes as bytes;
 extern crate parity_crypto as crypto;
-extern crate ethcore_io as io;
 extern crate ethcore_light as light;
 extern crate ethcore_logger;
 extern crate ethcore_miner as miner;
@@ -63,15 +61,18 @@ extern crate keccak_hash as hash;
 extern crate parity_runtime;
 extern crate parity_updater as updater;
 extern crate parity_version as version;
-extern crate trie_db as trie;
 extern crate eip_712;
 extern crate rlp;
 extern crate stats;
+extern crate tempdir;
 extern crate vm;
 
 #[cfg(any(test, feature = "ethcore-accounts"))]
 extern crate ethcore_accounts as accounts;
 
+#[cfg(any(test, feature = "ethcore-accounts"))]
+extern crate tiny_keccak;
+
 #[macro_use]
 extern crate log;
 #[macro_use]
@@ -90,13 +91,11 @@ extern crate pretty_assertions;
 #[macro_use]
 extern crate macros;
 
-#[cfg(test)]
-extern crate kvdb_memorydb;
-
 #[cfg(test)]
 extern crate fake_fetch;
 
-extern crate tempdir;
+#[cfg(test)]
+extern crate ethcore_io as io;
 
 pub extern crate jsonrpc_ws_server as ws;