diff --git a/Cargo.lock b/Cargo.lock
index 62652542fe04..8af7f4f87217 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1138,7 +1138,7 @@ checksum = "0e97ce7de6cf12de5d7226c73f5ba9811622f4db3a5b91b55c53e987e5f91cba"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -1160,7 +1160,7 @@ checksum = "16e62a023e7c117e27523144c5d2459f4397fcc3cab0085af8e2224f643a0193"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -1177,7 +1177,7 @@ checksum = "bc00ceb34980c03614e35a3a4e218276a0a824e911d07651cd0d858a51e8c0f0"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -1352,7 +1352,7 @@ dependencies = [
  "regex",
  "rustc-hash",
  "shlex",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -2516,7 +2516,7 @@ dependencies = [
  "heck",
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -3575,7 +3575,7 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -4067,7 +4067,7 @@ checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -4107,7 +4107,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "scratch",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -4124,7 +4124,7 @@ checksum = "50c49547d73ba8dcfd4ad7325d64c6d5391ff4224d498fc39a6f3f49825a530d"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -4422,7 +4422,7 @@ checksum = "487585f4d0c6655fe74905e2504d8ad6908e4db67f744eb140876906c2f3175d"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -4484,7 +4484,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "regex",
- "syn 2.0.29",
+ "syn 2.0.31",
  "termcolor",
  "toml 0.7.6",
  "walkdir",
@@ -4728,7 +4728,7 @@ checksum = "5e9a1f9f7d83e59740248a6e14ecf93929ade55027844dfcea78beafccc15745"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -4739,7 +4739,7 @@ checksum = "b893c4eb2dc092c811165f84dc7447fae16fb66521717968c34c509b39b1a5c5"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -4902,7 +4902,7 @@ dependencies = [
  "fs-err",
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -5258,7 +5258,7 @@ dependencies = [
  "quote",
  "scale-info",
  "sp-arithmetic",
- "syn 2.0.29",
+ "syn 2.0.31",
  "trybuild",
 ]
 
@@ -5410,7 +5410,7 @@ dependencies = [
  "proc-macro-warning",
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -5421,7 +5421,7 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -5430,7 +5430,7 @@ version = "3.0.0"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -5653,7 +5653,7 @@ checksum = "89ca545a94061b6365f2c7355b4b32bd20df3ff95f02da9329b34ccc3bd6ee72"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -7660,7 +7660,7 @@ dependencies = [
  "macro_magic_core",
  "macro_magic_macros",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -7674,7 +7674,7 @@ dependencies = [
  "macro_magic_core_macros",
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -7685,7 +7685,7 @@ checksum = "c12469fc165526520dff2807c2975310ab47cf7190a45b99b49a7dc8befab17b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -7696,7 +7696,7 @@ checksum = "b8fb85ec1620619edf2984a7693497d4ec88a9665d8b87e942856884c92dbf2a"
 dependencies = [
  "macro_magic_core",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -9403,7 +9403,7 @@ version = "4.0.0-dev"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -10474,7 +10474,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "sp-runtime",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -11333,7 +11333,7 @@ dependencies = [
  "pest_meta",
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -11374,7 +11374,7 @@ checksum = "4359fd9c9171ec6e8c62926d6faaf553a8dc3f64e1507e76da7911b4f6a04405"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -13347,7 +13347,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c64d9ba0963cdcea2e1b2230fbae2bab30eb25a174be395c41e764bfb65dd62"
 dependencies = [
  "proc-macro2",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -13429,7 +13429,7 @@ checksum = "3d1eaa7fa0aa1929ffdf7eeb6eac234dde6268914a14ad44d23521ab6a9b258e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -13475,7 +13475,7 @@ checksum = "440f724eba9f6996b75d63681b0a92b06947f1457076d503a4d2e2c8f56442b8"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -13866,7 +13866,7 @@ checksum = "7f7473c2cfcf90008193dd0e3e16599455cb601a9fce322b5bb55de799664925"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -14628,7 +14628,7 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -15841,7 +15841,7 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -16195,7 +16195,7 @@ checksum = "4eca7ac642d82aa35b60049a6eccb4be6be75e599bd2e9adb5f875a737654af2"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -16261,7 +16261,7 @@ checksum = "91d129178576168c589c9ec973feedf7d3126c01ac2bf08795109aa35b69fb8f"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -16701,7 +16701,7 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -17102,7 +17102,7 @@ version = "9.0.0"
 dependencies = [
  "quote",
  "sp-core-hashing",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -17146,7 +17146,7 @@ version = "8.0.0"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -17377,7 +17377,7 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -17617,7 +17617,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "sp-version",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -18441,9 +18441,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.29"
+version = "2.0.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c324c494eba9d92503e6f1ef2e6df781e78f6a7705a0202d9801b198807d518a"
+checksum = "718fa2415bcb8d8bd775917a1bf12a7931b6dfa890753378538118181e0cb398"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -18690,7 +18690,7 @@ checksum = "6bb623b56e39ab7dcd4b1b98bb6c8f8d907ed255b18de254088016b27a8ee19b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -18881,7 +18881,7 @@ checksum = "630bdcf245f78637c13ec01ffae6187cca34625e8c63150d424b59e55af2675e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -19062,7 +19062,7 @@ checksum = "5f4f31f56159e98206da9efd823404b79b6ef3143b4a7ab76e67b1751b25a4ab"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -19105,7 +19105,7 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -19678,7 +19678,7 @@ dependencies = [
  "once_cell",
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
  "wasm-bindgen-shared",
 ]
 
@@ -19712,7 +19712,7 @@ checksum = "54681b18a46765f095758388f2d0cf16eb8d4169b639ab575a8f5693af210c7b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
@@ -20848,7 +20848,7 @@ dependencies = [
  "Inflector",
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -20967,7 +20967,7 @@ checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.31",
 ]
 
 [[package]]
diff --git a/cumulus/pallets/parachain-system/proc-macro/Cargo.toml b/cumulus/pallets/parachain-system/proc-macro/Cargo.toml
index 58a4a97e0492..e5e7da81d2ae 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 = "2.0.29"
+syn = "2.0.31"
 proc-macro2 = "1.0.64"
 quote = "1.0.33"
 proc-macro-crate = "1.3.1"
diff --git a/polkadot/node/gum/proc-macro/Cargo.toml b/polkadot/node/gum/proc-macro/Cargo.toml
index fc057c769752..ec6b817476a9 100644
--- a/polkadot/node/gum/proc-macro/Cargo.toml
+++ b/polkadot/node/gum/proc-macro/Cargo.toml
@@ -13,7 +13,7 @@ targets = ["x86_64-unknown-linux-gnu"]
 proc-macro = true
 
 [dependencies]
-syn = { version = "2.0.15", features = ["full", "extra-traits"] }
+syn = { version = "2.0.31", features = ["full", "extra-traits"] }
 quote = "1.0.28"
 proc-macro2 = "1.0.56"
 proc-macro-crate = "1.1.3"
diff --git a/polkadot/xcm/procedural/Cargo.toml b/polkadot/xcm/procedural/Cargo.toml
index a5c50a48007f..6545fb68764d 100644
--- a/polkadot/xcm/procedural/Cargo.toml
+++ b/polkadot/xcm/procedural/Cargo.toml
@@ -11,5 +11,5 @@ proc-macro = true
 [dependencies]
 proc-macro2 = "1.0.56"
 quote = "1.0.28"
-syn = "2.0.15"
+syn = "2.0.31"
 Inflector = "0.11.4"
diff --git a/substrate/client/chain-spec/derive/Cargo.toml b/substrate/client/chain-spec/derive/Cargo.toml
index 8b8210fe04fe..b5ecc6107b94 100644
--- a/substrate/client/chain-spec/derive/Cargo.toml
+++ b/substrate/client/chain-spec/derive/Cargo.toml
@@ -18,4 +18,4 @@ proc-macro = true
 proc-macro-crate = "1.1.3"
 proc-macro2 = "1.0.56"
 quote = "1.0.28"
-syn = "2.0.16"
+syn = "2.0.31"
diff --git a/substrate/client/tracing/proc-macro/Cargo.toml b/substrate/client/tracing/proc-macro/Cargo.toml
index 23dc9557a4bc..8c444ffb606b 100644
--- a/substrate/client/tracing/proc-macro/Cargo.toml
+++ b/substrate/client/tracing/proc-macro/Cargo.toml
@@ -18,4 +18,4 @@ proc-macro = true
 proc-macro-crate = "1.1.3"
 proc-macro2 = "1.0.56"
 quote = { version = "1.0.28", features = ["proc-macro"] }
-syn = { version = "2.0.16", features = ["proc-macro", "full", "extra-traits", "parsing"] }
+syn = { version = "2.0.31", features = ["proc-macro", "full", "extra-traits", "parsing"] }
diff --git a/substrate/frame/contracts/proc-macro/Cargo.toml b/substrate/frame/contracts/proc-macro/Cargo.toml
index afc6ce281bb4..ecc5bc627b70 100644
--- a/substrate/frame/contracts/proc-macro/Cargo.toml
+++ b/substrate/frame/contracts/proc-macro/Cargo.toml
@@ -17,7 +17,7 @@ proc-macro = true
 [dependencies]
 proc-macro2 = "1.0.56"
 quote = "1.0.28"
-syn = { version = "2.0.16", features = ["full"] }
+syn = { version = "2.0.31", features = ["full"] }
 
 [dev-dependencies]
 
diff --git a/substrate/frame/election-provider-support/solution-type/Cargo.toml b/substrate/frame/election-provider-support/solution-type/Cargo.toml
index bc0127e91bad..7693da0372d9 100644
--- a/substrate/frame/election-provider-support/solution-type/Cargo.toml
+++ b/substrate/frame/election-provider-support/solution-type/Cargo.toml
@@ -15,7 +15,7 @@ targets = ["x86_64-unknown-linux-gnu"]
 proc-macro = true
 
 [dependencies]
-syn = { version = "2.0.16", features = ["full", "visit"] }
+syn = { version = "2.0.31", features = ["full", "visit"] }
 quote = "1.0.28"
 proc-macro2 = "1.0.56"
 proc-macro-crate = "1.1.3"
diff --git a/substrate/frame/staking/reward-curve/Cargo.toml b/substrate/frame/staking/reward-curve/Cargo.toml
index dc8458481619..e1b97d278da1 100644
--- a/substrate/frame/staking/reward-curve/Cargo.toml
+++ b/substrate/frame/staking/reward-curve/Cargo.toml
@@ -18,7 +18,7 @@ proc-macro = true
 proc-macro-crate = "1.1.3"
 proc-macro2 = "1.0.56"
 quote = "1.0.28"
-syn = { version = "2.0.16", features = ["full", "visit"] }
+syn = { version = "2.0.31", features = ["full", "visit"] }
 
 [dev-dependencies]
 sp-runtime = { path = "../../../primitives/runtime" }
diff --git a/substrate/frame/support/procedural/Cargo.toml b/substrate/frame/support/procedural/Cargo.toml
index ad28eed959eb..9ca86b9fccb1 100644
--- a/substrate/frame/support/procedural/Cargo.toml
+++ b/substrate/frame/support/procedural/Cargo.toml
@@ -21,7 +21,7 @@ cfg-expr = "0.15.4"
 itertools = "0.10.3"
 proc-macro2 = "1.0.56"
 quote = "1.0.28"
-syn = { version = "2.0.16", features = ["full"] }
+syn = { version = "2.0.31", features = ["full"] }
 frame-support-procedural-tools = { path = "tools" }
 proc-macro-warning = { version = "0.4.2", default-features = false }
 macro_magic = { version = "0.4.2", features = ["proc_support"] }
diff --git a/substrate/frame/support/procedural/tools/Cargo.toml b/substrate/frame/support/procedural/tools/Cargo.toml
index 3a56f29eb190..46c264256513 100644
--- a/substrate/frame/support/procedural/tools/Cargo.toml
+++ b/substrate/frame/support/procedural/tools/Cargo.toml
@@ -15,5 +15,5 @@ targets = ["x86_64-unknown-linux-gnu"]
 proc-macro-crate = "1.1.3"
 proc-macro2 = "1.0.56"
 quote = "1.0.28"
-syn = { version = "2.0.16", features = ["full", "visit", "extra-traits"] }
+syn = { version = "2.0.31", features = ["full", "visit", "extra-traits"] }
 frame-support-procedural-tools-derive = { path = "derive" }
diff --git a/substrate/frame/support/procedural/tools/derive/Cargo.toml b/substrate/frame/support/procedural/tools/derive/Cargo.toml
index 68e85a2060d9..da01e6f4f6af 100644
--- a/substrate/frame/support/procedural/tools/derive/Cargo.toml
+++ b/substrate/frame/support/procedural/tools/derive/Cargo.toml
@@ -17,4 +17,4 @@ proc-macro = true
 [dependencies]
 proc-macro2 = "1.0.56"
 quote = { version = "1.0.28", features = ["proc-macro"] }
-syn = { version = "2.0.16", features = ["proc-macro", "full", "extra-traits", "parsing"] }
+syn = { version = "2.0.31", features = ["proc-macro", "full", "extra-traits", "parsing"] }
diff --git a/substrate/primitives/api/proc-macro/Cargo.toml b/substrate/primitives/api/proc-macro/Cargo.toml
index c415813b978f..6819d139f450 100644
--- a/substrate/primitives/api/proc-macro/Cargo.toml
+++ b/substrate/primitives/api/proc-macro/Cargo.toml
@@ -17,7 +17,7 @@ proc-macro = true
 
 [dependencies]
 quote = "1.0.28"
-syn = { version = "2.0.16", features = ["full", "fold", "extra-traits", "visit"] }
+syn = { version = "2.0.31", features = ["full", "fold", "extra-traits", "visit"] }
 proc-macro2 = "1.0.56"
 blake2 = { version = "0.10.4", default-features = false }
 proc-macro-crate = "1.1.3"
diff --git a/substrate/primitives/core/hashing/proc-macro/Cargo.toml b/substrate/primitives/core/hashing/proc-macro/Cargo.toml
index d3a74d4bb814..ef17473a6f39 100644
--- a/substrate/primitives/core/hashing/proc-macro/Cargo.toml
+++ b/substrate/primitives/core/hashing/proc-macro/Cargo.toml
@@ -17,5 +17,5 @@ proc-macro = true
 
 [dependencies]
 quote = "1.0.28"
-syn = { version = "2.0.16", features = ["full", "parsing"] }
+syn = { version = "2.0.31", features = ["full", "parsing"] }
 sp-core-hashing = { path = "..", default-features = false}
diff --git a/substrate/primitives/debug-derive/Cargo.toml b/substrate/primitives/debug-derive/Cargo.toml
index bd35939a8b9e..292c07e092f9 100644
--- a/substrate/primitives/debug-derive/Cargo.toml
+++ b/substrate/primitives/debug-derive/Cargo.toml
@@ -18,7 +18,7 @@ proc-macro = true
 
 [dependencies]
 quote = "1.0.28"
-syn = "2.0.16"
+syn = "2.0.31"
 proc-macro2 = "1.0.56"
 
 [features]
diff --git a/substrate/primitives/runtime-interface/proc-macro/Cargo.toml b/substrate/primitives/runtime-interface/proc-macro/Cargo.toml
index 3488e4f50bf3..e01343d6dc0a 100644
--- a/substrate/primitives/runtime-interface/proc-macro/Cargo.toml
+++ b/substrate/primitives/runtime-interface/proc-macro/Cargo.toml
@@ -20,4 +20,4 @@ Inflector = "0.11.4"
 proc-macro-crate = "1.1.3"
 proc-macro2 = "1.0.56"
 quote = "1.0.28"
-syn = { version = "2.0.16", features = ["full", "visit", "fold", "extra-traits"] }
+syn = { version = "2.0.31", features = ["full", "visit", "fold", "extra-traits"] }
diff --git a/substrate/primitives/version/proc-macro/Cargo.toml b/substrate/primitives/version/proc-macro/Cargo.toml
index e7cec134ed55..25b5e7906f62 100644
--- a/substrate/primitives/version/proc-macro/Cargo.toml
+++ b/substrate/primitives/version/proc-macro/Cargo.toml
@@ -19,7 +19,7 @@ proc-macro = true
 codec = { package = "parity-scale-codec", version = "3.6.1", features = [ "derive" ] }
 proc-macro2 = "1.0.56"
 quote = "1.0.28"
-syn = { version = "2.0.16", features = ["full", "fold", "extra-traits", "visit"] }
+syn = { version = "2.0.31", features = ["full", "fold", "extra-traits", "visit"] }
 
 [dev-dependencies]
 sp-version = { path = ".." }