diff --git a/test-support/reference-trie/Cargo.toml b/test-support/reference-trie/Cargo.toml
index 76107199..43589393 100644
--- a/test-support/reference-trie/Cargo.toml
+++ b/test-support/reference-trie/Cargo.toml
@@ -1,10 +1,11 @@
 [package]
 name = "reference-trie"
-version = "0.12.3"
+version = "0.13.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 description = "Simple reference trie format"
 repository = "https://github.com/paritytech/trie/"
 license = "Apache-2.0"
+edition = "2018"
 
 [dependencies]
 hash-db = { path = "../../hash-db" , version = "0.12.3"}
@@ -12,11 +13,10 @@ hash256-std-hasher = { path = "../../hash256-std-hasher", version = "0.12.3" }
 keccak-hasher = { path = "../keccak-hasher", version = "0.12.3" }
 trie-db = { path = "../../trie-db", default-features = false, version = "0.12.3"}
 trie-root = { path = "../../trie-root", default-features = false, version = "0.12.3" }
-parity-codec = "3.0"
-parity-codec-derive = "3.0"
+parity-codec = { version = "4.0", features = ["derive"] }
 
 [dev-dependencies]
-trie-bench = { path = "../trie-bench", version = "0.12.3" }
+trie-bench = { path = "../trie-bench", version = "0.13.0" }
 criterion = "0.2.8"
 
 [[bench]]
diff --git a/test-support/reference-trie/src/lib.rs b/test-support/reference-trie/src/lib.rs
index 1d7edbd8..ece82b0c 100644
--- a/test-support/reference-trie/src/lib.rs
+++ b/test-support/reference-trie/src/lib.rs
@@ -14,16 +14,10 @@
 
 //! Reference implementation of a streamer.
 
-extern crate hash_db;
-extern crate trie_db;
-extern crate parity_codec as codec;
-extern crate trie_root;
-extern crate keccak_hasher;
-
 use std::fmt;
 use std::error::Error as StdError;
 use std::iter::once;
-use codec::{Decode, Input, Output, Encode, Compact};
+use parity_codec::{Decode, Input, Output, Encode, Compact};
 use trie_root::Hasher;
 use trie_db::{node::Node, triedbmut::ChildReference, DBValue};
 use keccak_hasher::KeccakHasher;
diff --git a/test-support/trie-bench/Cargo.toml b/test-support/trie-bench/Cargo.toml
index df12f5f5..68003bd8 100644
--- a/test-support/trie-bench/Cargo.toml
+++ b/test-support/trie-bench/Cargo.toml
@@ -1,9 +1,10 @@
 [package]
 name = "trie-bench"
 description = "Standard benchmarking suite for tries"
-version = "0.12.3"
+version = "0.13.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 license = "Apache-2.0"
+edition = "2018"
 
 [dependencies]
 keccak-hasher = { path = "../keccak-hasher", version = "0.12.3" }
@@ -13,4 +14,4 @@ memory-db = { path = "../../memory-db", version = "0.12.3" }
 trie-root = { path = "../../trie-root", version = "0.12.3" }
 trie-db = { path = "../../trie-db", version = "0.12.3" }
 criterion = "0.2.8"
-parity-codec = "3.0"
+parity-codec = "4.0"
diff --git a/test-support/trie-bench/src/lib.rs b/test-support/trie-bench/src/lib.rs
index f21d4379..dae56e13 100644
--- a/test-support/trie-bench/src/lib.rs
+++ b/test-support/trie-bench/src/lib.rs
@@ -14,15 +14,6 @@
 
 //! Standard trie benchmarking tool.
 
-extern crate criterion;
-extern crate keccak_hasher;
-extern crate hash_db;
-extern crate memory_db;
-extern crate trie_db;
-extern crate trie_root;
-extern crate trie_standardmap;
-extern crate parity_codec;
-
 use parity_codec::{Encode, Compact};
 use criterion::{Criterion, black_box, Fun};
 use keccak_hasher::KeccakHasher;
diff --git a/trie-db/Cargo.toml b/trie-db/Cargo.toml
index 1f2cdf89..009b18ac 100644
--- a/trie-db/Cargo.toml
+++ b/trie-db/Cargo.toml
@@ -20,7 +20,7 @@ trie-root = { path = "../trie-root", version = "0.12.3"}
 trie-standardmap = { path = "../test-support/trie-standardmap", version = "0.12.3" }
 keccak-hasher = { path = "../test-support/keccak-hasher", version = "0.12.3" }
 # DISABLE the following line when publishing until cyclic dependencies are resolved https://github.com/rust-lang/cargo/issues/4242
-reference-trie = { path = "../test-support/reference-trie", version = "0.12.3" }
+reference-trie = { path = "../test-support/reference-trie", version = "0.13.0" }
 hex-literal = "0.1"
 criterion = "0.2.8"
 
diff --git a/trie-root/Cargo.toml b/trie-root/Cargo.toml
index 8c5a3411..ecd4b639 100644
--- a/trie-root/Cargo.toml
+++ b/trie-root/Cargo.toml
@@ -15,7 +15,7 @@ hex-literal = "0.1"
 keccak-hasher = { path = "../test-support/keccak-hasher", version = "0.12.3" }
 trie-standardmap = { path = "../test-support/trie-standardmap", version = "0.12.3" }
 # DISABLE the following line when publishing until cyclic dependencies are resolved https://github.com/rust-lang/cargo/issues/4242
-reference-trie = { path = "../test-support/reference-trie", version = "0.12.3" }
+reference-trie = { path = "../test-support/reference-trie", version = "0.13.0" }
 
 [features]
 default = ["std"]