diff --git a/contracts/src/Verification.sol b/contracts/src/Verification.sol
index 7a1bfe64eb..391601b91d 100644
--- a/contracts/src/Verification.sol
+++ b/contracts/src/Verification.sol
@@ -76,6 +76,9 @@ library Verification {
     uint256 public constant DIGEST_ITEM_PRERUNTIME = 6;
     uint256 public constant DIGEST_ITEM_RUNTIME_ENVIRONMENT_UPDATED = 8;
 
+    /// @dev Enum variant ID for CustomDigestItem::Snowbridge
+    bytes1 public constant DIGEST_ITEM_OTHER_SNOWBRIDGE = 0x00;
+
     /// @dev Verify the message commitment by applying several proofs
     ///
     /// 1. First check that the commitment is included in the digest items of the parachain header
@@ -132,8 +135,11 @@ library Verification {
         returns (bool)
     {
         for (uint256 i = 0; i < header.digestItems.length; i++) {
-            DigestItem memory item = header.digestItems[i];
-            if (item.kind == DIGEST_ITEM_OTHER && item.data.length == 32 && commitment == bytes32(item.data)) {
+            if (
+                header.digestItems[i].kind == DIGEST_ITEM_OTHER && header.digestItems[i].data.length == 33
+                    && header.digestItems[i].data[0] == DIGEST_ITEM_OTHER_SNOWBRIDGE
+                    && commitment == bytes32(header.digestItems[i].data[1:])
+            ) {
                 return true;
             }
         }
diff --git a/contracts/test/Verification.t.sol b/contracts/test/Verification.t.sol
index 7e6ce46478..53bb77a3b1 100644
--- a/contracts/test/Verification.t.sol
+++ b/contracts/test/Verification.t.sol
@@ -88,7 +88,7 @@ contract VerificationTest is Test {
         digestItems[2] = Verification.DigestItem({
             kind: 0,
             consensusEngineID: 0x00000000,
-            data: hex"b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b878ae4944c"
+            data: hex"00b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b878ae4944c"
         });
         digestItems[3] = Verification.DigestItem({
             kind: 5,
diff --git a/parachain/Cargo.lock b/parachain/Cargo.lock
index 7e79563be6..824db20b41 100644
--- a/parachain/Cargo.lock
+++ b/parachain/Cargo.lock
@@ -1622,6 +1622,7 @@ dependencies = [
  "parity-scale-codec",
  "scale-info",
  "snowbridge-core",
+ "sp-core",
  "sp-runtime",
  "sp-std 8.0.0",
  "staging-xcm",
diff --git a/parachain/pallets/outbound-queue/src/lib.rs b/parachain/pallets/outbound-queue/src/lib.rs
index 6c461510b3..d4ffe24a5f 100644
--- a/parachain/pallets/outbound-queue/src/lib.rs
+++ b/parachain/pallets/outbound-queue/src/lib.rs
@@ -90,7 +90,7 @@ mod mock;
 #[cfg(test)]
 mod test;
 
-use bridge_hub_common::AggregateMessageOrigin;
+use bridge_hub_common::{AggregateMessageOrigin, CustomDigestItem};
 use codec::Decode;
 use frame_support::{
 	storage::StorageStreamIter,
@@ -104,7 +104,10 @@ use snowbridge_core::{
 use snowbridge_outbound_queue_merkle_tree::merkle_root;
 pub use snowbridge_outbound_queue_merkle_tree::MerkleProof;
 use sp_core::{H256, U256};
-use sp_runtime::traits::{CheckedDiv, Hash};
+use sp_runtime::{
+	traits::{CheckedDiv, Hash},
+	DigestItem,
+};
 use sp_std::prelude::*;
 pub use types::{CommittedMessage, FeeConfigRecord, ProcessMessageOriginOf};
 pub use weights::WeightInfo;
@@ -277,10 +280,10 @@ pub mod pallet {
 			// Create merkle root of messages
 			let root = merkle_root::<<T as Config>::Hashing, _>(MessageLeaves::<T>::stream_iter());
 
+			let digest_item: DigestItem = CustomDigestItem::Snowbridge(root).into();
+
 			// Insert merkle root into the header digest
-			<frame_system::Pallet<T>>::deposit_log(sp_runtime::DigestItem::Other(
-				root.to_fixed_bytes().into(),
-			));
+			<frame_system::Pallet<T>>::deposit_log(digest_item);
 
 			Self::deposit_event(Event::MessagesCommitted { root, count });
 		}
diff --git a/parachain/pallets/outbound-queue/src/test.rs b/parachain/pallets/outbound-queue/src/test.rs
index 7db5fbec2c..675fa12911 100644
--- a/parachain/pallets/outbound-queue/src/test.rs
+++ b/parachain/pallets/outbound-queue/src/test.rs
@@ -237,3 +237,15 @@ fn convert_local_currency() {
 		assert_eq!(fee, fee2);
 	});
 }
+
+#[test]
+fn encode_digest_item() {
+	new_tester().execute_with(|| {
+		let digest_item: DigestItem = CustomDigestItem::Snowbridge(H256::default()).into();
+		let enum_prefix = match digest_item {
+			DigestItem::Other(data) => data[0],
+			_ => u8::MAX,
+		};
+		assert_eq!(enum_prefix, 0);
+	});
+}
diff --git a/polkadot-sdk b/polkadot-sdk
index 85470f8b06..46056e6275 160000
--- a/polkadot-sdk
+++ b/polkadot-sdk
@@ -1 +1 @@
-Subproject commit 85470f8b062e356a80d2b47c4c3cd68281811caf
+Subproject commit 46056e6275dba70f09a359516109de26951c14bc
diff --git a/relayer/relays/parachain/digest_item.go b/relayer/relays/parachain/digest_item.go
index 425493d206..1304d0027f 100644
--- a/relayer/relays/parachain/digest_item.go
+++ b/relayer/relays/parachain/digest_item.go
@@ -7,12 +7,16 @@ import (
 func ExtractCommitmentFromDigest(digest types.Digest) (*types.H256, error) {
 	for _, digestItem := range digest {
 		if digestItem.IsOther {
-			var commitment types.H256
-			err := types.DecodeFromBytes(digestItem.AsOther, &commitment)
-			if err != nil {
-				return nil, err
+			digestItemRawBytes := digestItem.AsOther
+			// Prefix 0 reserved for snowbridge
+			if digestItemRawBytes[0] == 0 {
+				var commitment types.H256
+				err := types.DecodeFromBytes(digestItemRawBytes[1:], &commitment)
+				if err != nil {
+					return nil, err
+				}
+				return &commitment, nil
 			}
-			return &commitment, nil
 		}
 	}
 	return nil, nil