diff --git a/cumulus/Cargo.lock b/cumulus/Cargo.lock
index f22e30f417..0acb8c0c18 100644
--- a/cumulus/Cargo.lock
+++ b/cumulus/Cargo.lock
@@ -2098,7 +2098,7 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.9",
 ]
 
 [[package]]
diff --git a/cumulus/pallets/parachain-system/proc-macro/Cargo.toml b/cumulus/pallets/parachain-system/proc-macro/Cargo.toml
index fa975eb0b8..e3f9487d8c 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 = "1.0.109"
+syn = "2.0.9"
 proc-macro2 = "1.0.52"
 quote = "1.0.26"
 proc-macro-crate = "1.3.1"