diff --git a/cumulus/Cargo.lock b/cumulus/Cargo.lock
index db069c9addf3af2d836e1256ab16adfc3579d27f..fcfdef62c04ab4885abeb560d671f74d6b03b6be 100644
--- a/cumulus/Cargo.lock
+++ b/cumulus/Cargo.lock
@@ -12099,9 +12099,9 @@ checksum = "6bdef32e8150c2a081110b42772ffe7d7c9032b606bc226c8260fd97e0976601"
 
 [[package]]
 name = "syn"
-version = "1.0.104"
+version = "1.0.105"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4ae548ec36cf198c0ef7710d3c230987c2d6d7bd98ad6edc0274462724c585ce"
+checksum = "60b9b43d45702de4c839cb9b51d9f529c5dd26a4aff255b42b1ebc03e88ee908"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/cumulus/pallets/parachain-system/proc-macro/Cargo.toml b/cumulus/pallets/parachain-system/proc-macro/Cargo.toml
index cb3c7cf32d7812dcda2a00e0e7ed8271968818ad..dc6d1c4157145c63062fac0c7364f9093b693423 100644
--- a/cumulus/pallets/parachain-system/proc-macro/Cargo.toml
+++ b/cumulus/pallets/parachain-system/proc-macro/Cargo.toml
@@ -9,7 +9,7 @@ description = "Proc macros provided by the parachain-system pallet"
 proc-macro = true
 
 [dependencies]
-syn = "1.0.104"
+syn = "1.0.105"
 proc-macro2 = "1.0.47"
 quote = "1.0.21"
 proc-macro-crate = "1.2.1"