diff --git a/Cargo.lock b/Cargo.lock
index 59d46b7b8c3a..bf94de083777 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -10408,9 +10408,9 @@ checksum = "6bdef32e8150c2a081110b42772ffe7d7c9032b606bc226c8260fd97e0976601"
 
 [[package]]
 name = "syn"
-version = "1.0.77"
+version = "1.0.78"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5239bc68e0fef57495900cfea4e8dc75596d9a319d7e16b1e0a440d24e6fe0a0"
+checksum = "a4eac2e6c19f5c3abc0c229bea31ff0b9b091c7b14990e8924b92902a303a0c0"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/node/overseer/overseer-gen/proc-macro/Cargo.toml b/node/overseer/overseer-gen/proc-macro/Cargo.toml
index aa972b0e6a56..9495fb5a8678 100644
--- a/node/overseer/overseer-gen/proc-macro/Cargo.toml
+++ b/node/overseer/overseer-gen/proc-macro/Cargo.toml
@@ -12,7 +12,7 @@ targets = ["x86_64-unknown-linux-gnu"]
 proc-macro = true
 
 [dependencies]
-syn = { version = "1.0.77", features = ["full", "extra-traits"] }
+syn = { version = "1.0.78", features = ["full", "extra-traits"] }
 quote = "1.0.9"
 proc-macro2 = "1.0.26"
 proc-macro-crate = "1.1.0"
diff --git a/xcm/procedural/Cargo.toml b/xcm/procedural/Cargo.toml
index fde65dcdd51a..03b5275c04f6 100644
--- a/xcm/procedural/Cargo.toml
+++ b/xcm/procedural/Cargo.toml
@@ -10,4 +10,4 @@ proc-macro = true
 [dependencies]
 proc-macro2 = "1.0.28"
 quote = "1.0.9"
-syn = "1.0.77"
+syn = "1.0.78"