diff --git a/test-support/reference-trie/Cargo.toml b/test-support/reference-trie/Cargo.toml
index 54a67706..dcf24f28 100644
--- a/test-support/reference-trie/Cargo.toml
+++ b/test-support/reference-trie/Cargo.toml
@@ -13,7 +13,7 @@ hash256-std-hasher = { path = "../../hash256-std-hasher", version = "0.15.2" }
 keccak-hasher = { path = "../keccak-hasher", version = "0.15.3" }
 trie-db = { path = "../../trie-db", default-features = false, version = "0.22.0" }
 trie-root = { path = "../../trie-root", default-features = false, version = "0.16.0" }
-parity-scale-codec = { version = "1.0.3", features = ["derive"] }
+parity-scale-codec = { version = "2.0.0", features = ["derive"] }
 
 [dev-dependencies]
 trie-bench = { path = "../trie-bench", version = "0.26.0" }
diff --git a/test-support/trie-bench/Cargo.toml b/test-support/trie-bench/Cargo.toml
index ffcd600d..09b39f4e 100644
--- a/test-support/trie-bench/Cargo.toml
+++ b/test-support/trie-bench/Cargo.toml
@@ -15,4 +15,4 @@ memory-db = { path = "../../memory-db", version = "0.25.0" }
 trie-root = { path = "../../trie-root", version = "0.16.0" }
 trie-db = { path = "../../trie-db", version = "0.22.0" }
 criterion = "0.3.3"
-parity-scale-codec = { version = "1.0.3" }
+parity-scale-codec = { version = "2.0.0" }