diff --git a/cumulus/Cargo.lock b/cumulus/Cargo.lock
index 5feafffaf4..8b56752596 100644
--- a/cumulus/Cargo.lock
+++ b/cumulus/Cargo.lock
@@ -7202,9 +7202,9 @@ dependencies = [
 
 [[package]]
 name = "parity-scale-codec"
-version = "3.3.0"
+version = "3.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c3840933452adf7b3b9145e27086a5a3376c619dca1a21b1e5a5af0d54979bed"
+checksum = "637935964ff85a605d114591d4d2c13c5d1ba2806dae97cea6bf180238a749ac"
 dependencies = [
  "arrayvec 0.7.2",
  "bitvec",
diff --git a/cumulus/client/relay-chain-interface/Cargo.toml b/cumulus/client/relay-chain-interface/Cargo.toml
index 607e755a21..5f637129a7 100644
--- a/cumulus/client/relay-chain-interface/Cargo.toml
+++ b/cumulus/client/relay-chain-interface/Cargo.toml
@@ -20,4 +20,4 @@ futures = "0.3.26"
 async-trait = "0.1.63"
 thiserror = "1.0.38"
 jsonrpsee-core = "0.16.2"
-parity-scale-codec = "3.3.0"
+parity-scale-codec = "3.4.0"
diff --git a/cumulus/client/relay-chain-rpc-interface/Cargo.toml b/cumulus/client/relay-chain-rpc-interface/Cargo.toml
index 1662958eb5..cdb316f3cf 100644
--- a/cumulus/client/relay-chain-rpc-interface/Cargo.toml
+++ b/cumulus/client/relay-chain-rpc-interface/Cargo.toml
@@ -23,7 +23,7 @@ tokio = { version = "1.25.0", features = ["sync"] }
 
 futures = "0.3.26"
 futures-timer = "3.0.2"
-parity-scale-codec = "3.3.0"
+parity-scale-codec = "3.4.0"
 jsonrpsee = { version = "0.16.2", features = ["ws-client"] }
 tracing = "0.1.37"
 async-trait = "0.1.63"
diff --git a/cumulus/pallets/session-benchmarking/Cargo.toml b/cumulus/pallets/session-benchmarking/Cargo.toml
index 538948243d..11f985633e 100644
--- a/cumulus/pallets/session-benchmarking/Cargo.toml
+++ b/cumulus/pallets/session-benchmarking/Cargo.toml
@@ -13,7 +13,7 @@ readme = "README.md"
 targets = ["x86_64-unknown-linux-gnu"]
 
 [dependencies]
-parity-scale-codec = { version = "3.3.0", default-features = false }
+parity-scale-codec = { version = "3.4.0", default-features = false }
 sp-std = { default-features = false, git = "https://github.com/paritytech/substrate", branch = "master" }
 sp-runtime = { default-features = false, git = "https://github.com/paritytech/substrate", branch = "master" }
 frame-support = { default-features = false, git = "https://github.com/paritytech/substrate", branch = "master" }