diff --git a/cumulus/Cargo.lock b/cumulus/Cargo.lock
index 9508204efb..51bb9225d3 100644
--- a/cumulus/Cargo.lock
+++ b/cumulus/Cargo.lock
@@ -8893,9 +8893,9 @@ dependencies = [
 
 [[package]]
 name = "parity-scale-codec"
-version = "3.6.3"
+version = "3.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "756d439303e94fae44f288ba881ad29670c65b0c4b0e05674ca81061bb65f2c5"
+checksum = "dd8e946cc0cc711189c0b0249fb8b599cbeeab9784d83c415719368bb8d4ac64"
 dependencies = [
  "arrayvec 0.7.2",
  "bitvec",
@@ -8908,9 +8908,9 @@ dependencies = [
 
 [[package]]
 name = "parity-scale-codec-derive"
-version = "3.6.3"
+version = "3.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d884d78fcf214d70b1e239fcd1c6e5e95aa3be1881918da2e488cc946c7a476"
+checksum = "2a296c3079b5fefbc499e1de58dc26c09b1b9a5952d26694ee89f04a43ebbb3e"
 dependencies = [
  "proc-macro-crate",
  "proc-macro2",
diff --git a/cumulus/client/relay-chain-interface/Cargo.toml b/cumulus/client/relay-chain-interface/Cargo.toml
index f0799b51d5..1facab311f 100644
--- a/cumulus/client/relay-chain-interface/Cargo.toml
+++ b/cumulus/client/relay-chain-interface/Cargo.toml
@@ -18,4 +18,4 @@ futures = "0.3.28"
 async-trait = "0.1.71"
 thiserror = "1.0.43"
 jsonrpsee-core = "0.16.2"
-parity-scale-codec = "3.6.3"
+parity-scale-codec = "3.6.4"
diff --git a/cumulus/client/relay-chain-rpc-interface/Cargo.toml b/cumulus/client/relay-chain-rpc-interface/Cargo.toml
index 3d7a9a56f6..aaf6f08b54 100644
--- a/cumulus/client/relay-chain-rpc-interface/Cargo.toml
+++ b/cumulus/client/relay-chain-rpc-interface/Cargo.toml
@@ -25,7 +25,7 @@ tokio = { version = "1.29.1", features = ["sync"] }
 
 futures = "0.3.28"
 futures-timer = "3.0.2"
-parity-scale-codec = "3.6.3"
+parity-scale-codec = "3.6.4"
 jsonrpsee = { version = "0.16.2", features = ["ws-client"] }
 tracing = "0.1.37"
 async-trait = "0.1.71"
diff --git a/cumulus/pallets/session-benchmarking/Cargo.toml b/cumulus/pallets/session-benchmarking/Cargo.toml
index 8615edd0a0..ec83adbfc1 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 = "3.6.3", default-features = false }
+parity-scale-codec = { version = "3.6.4", 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" }