diff --git a/Cargo.lock b/Cargo.lock
index e4147bc8217..8ceaa6f76da 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -547,7 +547,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "51670c3aa053938b0ee3bd67c3817e471e626151131b934038e83c5bf8de48f5"
 dependencies = [
  "once_cell",
- "proc-macro-crate 3.1.0",
+ "proc-macro-crate",
  "proc-macro2",
  "quote",
  "syn 2.0.63",
@@ -4210,9 +4210,9 @@ dependencies = [
 
 [[package]]
 name = "parity-scale-codec"
-version = "3.6.9"
+version = "3.6.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "881331e34fa842a2fb61cc2db9643a8fedc615e47cfcc52597d1af0db9a7e8fe"
+checksum = "306800abfa29c7f16596b5970a588435e3d5b3149683d00c12b699cc19f895ee"
 dependencies = [
  "arrayvec",
  "bitvec",
@@ -4224,11 +4224,11 @@ dependencies = [
 
 [[package]]
 name = "parity-scale-codec-derive"
-version = "3.6.9"
+version = "3.6.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "be30eaf4b0a9fba5336683b38de57bb86d179a35862ba6bfcf57625d006bde5b"
+checksum = "d830939c76d294956402033aee57a6da7b438f2294eb94864c37b0569053a42c"
 dependencies = [
- "proc-macro-crate 2.0.0",
+ "proc-macro-crate",
  "proc-macro2",
  "quote",
  "syn 1.0.109",
@@ -4496,15 +4496,6 @@ version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
 
-[[package]]
-name = "proc-macro-crate"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7e8366a6159044a37876a2b9817124296703c586a5c92e2c53751fa06d8d43e8"
-dependencies = [
- "toml_edit 0.20.2",
-]
-
 [[package]]
 name = "proc-macro-crate"
 version = "3.1.0"
@@ -5955,17 +5946,6 @@ dependencies = [
  "serde",
 ]
 
-[[package]]
-name = "toml_edit"
-version = "0.20.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "396e4d48bbb2b7554c944bde63101b5ae446cff6ec4a24227428f15eb72ef338"
-dependencies = [
- "indexmap 2.2.6",
- "toml_datetime",
- "winnow 0.5.40",
-]
-
 [[package]]
 name = "toml_edit"
 version = "0.21.1"
diff --git a/Cargo.toml b/Cargo.toml
index 13bcd2b6ac4..c5d6a1e4a66 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -121,7 +121,7 @@ serde = { version = "1.0.201", default-features = false }
 serde_json = { version = "1.0.116", default-features = false }
 serde_yaml = "0.9.34"
 serde_with = { version = "3.8.1", default-features = false }
-parity-scale-codec = { version = "3.6.9", default-features = false }
+parity-scale-codec = { version = "3.6.12", default-features = false }
 json5 = "0.4.1"
 toml = "0.8.12"
 
diff --git a/core/test_network/Cargo.toml b/core/test_network/Cargo.toml
index 71e24f95f18..1001f732434 100644
--- a/core/test_network/Cargo.toml
+++ b/core/test_network/Cargo.toml
@@ -25,5 +25,5 @@ rand = { workspace = true }
 tempfile = { workspace = true }
 tokio = { workspace = true, features = ["rt", "rt-multi-thread", "macros"] }
 unique_port = "0.2.1"
-parity-scale-codec = { version = "3.6.9", default-features = false }
+parity-scale-codec = { version = "3.6.12", default-features = false }
 serde_json = { workspace = true }