diff --git a/cumulus/Cargo.lock b/cumulus/Cargo.lock
index 28c1c8f6b6..1b69ce7539 100644
--- a/cumulus/Cargo.lock
+++ b/cumulus/Cargo.lock
@@ -803,7 +803,7 @@ checksum = "0e97ce7de6cf12de5d7226c73f5ba9811622f4db3a5b91b55c53e987e5f91cba"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -814,7 +814,7 @@ checksum = "cc6dde6e4ed435a4c1ee4e73592f5ba9da2151af10076cc04858746af9352d09"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -949,7 +949,7 @@ dependencies = [
  "regex",
  "rustc-hash",
  "shlex",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -1941,7 +1941,7 @@ dependencies = [
  "heck",
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -2926,7 +2926,7 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -3743,7 +3743,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "regex",
- "syn 2.0.26",
+ "syn 2.0.27",
  "termcolor",
  "walkdir",
 ]
@@ -3938,7 +3938,7 @@ checksum = "5e9a1f9f7d83e59740248a6e14ecf93929ade55027844dfcea78beafccc15745"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -3949,7 +3949,7 @@ checksum = "48016319042fb7c87b78d2993084a831793a897a5cd1a2a67cab9d1eeb4b7d76"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -4098,7 +4098,7 @@ dependencies = [
  "fs-err",
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -4376,7 +4376,7 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -4496,7 +4496,7 @@ dependencies = [
  "proc-macro-warning",
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -4508,7 +4508,7 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -4518,7 +4518,7 @@ source = "git+https://github.com/paritytech/substrate?branch=master#e076bdad1fef
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -4687,7 +4687,7 @@ checksum = "89ca545a94061b6365f2c7355b4b32bd20df3ff95f02da9329b34ccc3bd6ee72"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -6593,7 +6593,7 @@ dependencies = [
  "macro_magic_core",
  "macro_magic_macros",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -6606,7 +6606,7 @@ dependencies = [
  "macro_magic_core_macros",
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -6617,7 +6617,7 @@ checksum = "93d7d9e6e234c040dafc745c7592738d56a03ad04b1fa04ab60821deb597466a"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -6628,7 +6628,7 @@ checksum = "ffd19f13cfd2bfbd83692adfef8c244fe5109b3eb822a1fb4e0a6253b406cd81"
 dependencies = [
  "macro_magic_core",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -7756,7 +7756,7 @@ source = "git+https://github.com/paritytech/substrate?branch=master#e076bdad1fef
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -8435,7 +8435,7 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -10842,7 +10842,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1ceca8aaf45b5c46ec7ed39fff75f57290368c1846d33d24a122ca81416ab058"
 dependencies = [
  "proc-macro2",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -10918,7 +10918,7 @@ checksum = "70550716265d1ec349c41f70dd4f964b4fd88394efe4405f0c1da679c4799a07"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -11926,7 +11926,7 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -12849,7 +12849,7 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -13175,7 +13175,7 @@ checksum = "b23f7ade6f110613c0d63858ddb8b94c1041f550eab58a16b371bdf2c9c80ab4"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -13484,7 +13484,7 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -13721,7 +13721,7 @@ source = "git+https://github.com/paritytech/substrate?branch=master#e076bdad1fef
 dependencies = [
  "quote",
  "sp-core-hashing",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -13740,7 +13740,7 @@ source = "git+https://github.com/paritytech/substrate?branch=master#e076bdad1fef
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -13947,7 +13947,7 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -14139,7 +14139,7 @@ dependencies = [
  "parity-scale-codec",
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -14463,7 +14463,7 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -14512,9 +14512,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.26"
+version = "2.0.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "45c3457aacde3c65315de5031ec191ce46604304d2446e803d71ade03308d970"
+checksum = "b60f673f44a8255b9c8c657daf66a596d435f2da81a555b06dc644d080ba45e0"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -14625,7 +14625,7 @@ checksum = "090198534930841fab3a5d1bb637cde49e339654e606195f8d9c76eeb081dc96"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -14806,7 +14806,7 @@ checksum = "630bdcf245f78637c13ec01ffae6187cca34625e8c63150d424b59e55af2675e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -15017,7 +15017,7 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
@@ -16646,7 +16646,7 @@ dependencies = [
  "Inflector",
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn 2.0.27",
 ]
 
 [[package]]
diff --git a/cumulus/pallets/parachain-system/proc-macro/Cargo.toml b/cumulus/pallets/parachain-system/proc-macro/Cargo.toml
index 0d5bf09c63..ae63021191 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 = "2.0.26"
+syn = "2.0.27"
 proc-macro2 = "1.0.64"
 quote = "1.0.31"
 proc-macro-crate = "1.3.1"