diff --git a/polkadot/Cargo.lock b/polkadot/Cargo.lock
index 7b62800353..36ce01212f 100644
--- a/polkadot/Cargo.lock
+++ b/polkadot/Cargo.lock
@@ -10368,9 +10368,9 @@ checksum = "6bdef32e8150c2a081110b42772ffe7d7c9032b606bc226c8260fd97e0976601"
 
 [[package]]
 name = "syn"
-version = "1.0.76"
+version = "1.0.77"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c6f107db402c2c2055242dbf4d2af0e69197202e9faacbef9571bbe47f5a1b84"
+checksum = "5239bc68e0fef57495900cfea4e8dc75596d9a319d7e16b1e0a440d24e6fe0a0"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/polkadot/node/overseer/all-subsystems-gen/Cargo.toml b/polkadot/node/overseer/all-subsystems-gen/Cargo.toml
index e33377db3d..6c4e7f00ee 100644
--- a/polkadot/node/overseer/all-subsystems-gen/Cargo.toml
+++ b/polkadot/node/overseer/all-subsystems-gen/Cargo.toml
@@ -9,7 +9,7 @@ description = "Small proc macro to create mocking level iface type helpers"
 proc-macro = true
 
 [dependencies]
-syn = { version = "1.0.76", features = ["full", "extra-traits"] }
+syn = { version = "1.0.77", features = ["full", "extra-traits"] }
 quote = "1.0.9"
 proc-macro2 = "1.0.24"
 
diff --git a/polkadot/node/overseer/overseer-gen/proc-macro/Cargo.toml b/polkadot/node/overseer/overseer-gen/proc-macro/Cargo.toml
index fd76912bce..47af610cd0 100644
--- a/polkadot/node/overseer/overseer-gen/proc-macro/Cargo.toml
+++ b/polkadot/node/overseer/overseer-gen/proc-macro/Cargo.toml
@@ -12,7 +12,7 @@ targets = ["x86_64-unknown-linux-gnu"]
 proc-macro = true
 
 [dependencies]
-syn = { version = "1.0.76", features = ["full", "extra-traits"] }
+syn = { version = "1.0.77", features = ["full", "extra-traits"] }
 quote = "1.0.9"
 proc-macro2 = "1.0.26"
 proc-macro-crate = "1.1.0"
diff --git a/polkadot/xcm/procedural/Cargo.toml b/polkadot/xcm/procedural/Cargo.toml
index 0f4b929076..fde65dcdd5 100644
--- a/polkadot/xcm/procedural/Cargo.toml
+++ b/polkadot/xcm/procedural/Cargo.toml
@@ -10,4 +10,4 @@ proc-macro = true
 [dependencies]
 proc-macro2 = "1.0.28"
 quote = "1.0.9"
-syn = "1.0.76"
+syn = "1.0.77"