diff --git a/Cargo.lock b/Cargo.lock
index 2bfae6d..e6d241f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2681,6 +2681,7 @@ dependencies = [
  "cumulus-pallet-session-benchmarking",
  "cumulus-pallet-xcm",
  "cumulus-pallet-xcmp-queue",
+ "cumulus-primitives-aura",
  "cumulus-primitives-core",
  "cumulus-primitives-timestamp",
  "cumulus-primitives-utility",
@@ -5477,6 +5478,7 @@ dependencies = [
  "cumulus-pallet-session-benchmarking",
  "cumulus-pallet-xcm",
  "cumulus-pallet-xcmp-queue",
+ "cumulus-primitives-aura",
  "cumulus-primitives-core",
  "cumulus-primitives-timestamp",
  "cumulus-primitives-utility",
@@ -7452,6 +7454,7 @@ dependencies = [
  "cumulus-client-consensus-common",
  "cumulus-client-consensus-proposer",
  "cumulus-client-service",
+ "cumulus-primitives-aura",
  "cumulus-primitives-core",
  "cumulus-primitives-parachain-inherent",
  "cumulus-relay-chain-inprocess-interface",
diff --git a/Cargo.toml b/Cargo.toml
index 5ecd446..68b9fe1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -113,6 +113,7 @@ cumulus-pallet-parachain-system = { version = "0.4.0", default-features = false
 cumulus-pallet-session-benchmarking = { version = "6.0.0", default-features = false }
 cumulus-pallet-xcm = { version = "0.4.0", default-features = false }
 cumulus-pallet-xcmp-queue = { version = "0.4.0", default-features = false }
+cumulus-primitives-aura = { version = "0.4.0", default-features = false }
 cumulus-primitives-core = { version = "0.4.0", default-features = false }
 cumulus-primitives-parachain-inherent = { version = "0.4.0" }
 cumulus-primitives-timestamp = { version = "0.4.0", default-features = false }
diff --git a/node/Cargo.toml b/node/Cargo.toml
index b6adfdc..1db9620 100644
--- a/node/Cargo.toml
+++ b/node/Cargo.toml
@@ -73,6 +73,7 @@ cumulus-client-consensus-aura = { workspace = true }
 cumulus-client-consensus-common = { workspace = true }
 cumulus-client-collator = { workspace = true }
 cumulus-client-service = { workspace = true }
+cumulus-primitives-aura = { workspace = true }
 cumulus-primitives-core = { workspace = true }
 cumulus-primitives-parachain-inherent = { workspace = true }
 cumulus-client-consensus-proposer = { workspace = true }
diff --git a/node/src/service.rs b/node/src/service.rs
index 8324b7f..729f713 100644
--- a/node/src/service.rs
+++ b/node/src/service.rs
@@ -17,6 +17,7 @@ use cumulus_relay_chain_interface::{OverseerHandle, RelayChainInterface};
 
 // Substrate Imports
 use frame_benchmarking_cli::SUBSTRATE_REFERENCE_HARDWARE;
+use polkadot_primitives::ValidationCode;
 use sc_client_api::Backend;
 use sc_consensus::ImportQueue;
 use sc_executor::{
@@ -215,6 +216,7 @@ where
 		+ sp_offchain::OffchainWorkerApi<Block>
 		+ sp_block_builder::BlockBuilder<Block>
 		+ cumulus_primitives_core::CollectCollationInfo<Block>
+		+ cumulus_primitives_aura::AuraUnincludedSegmentApi<Block>
 		+ pallet_transaction_payment_rpc::TransactionPaymentRuntimeApi<Block, Balance>
 		+ substrate_frame_rpc_system::AccountNonceApi<Block, AccountId, Nonce>,
 
@@ -231,6 +233,7 @@ where
 		+ 'static,
 	SC: FnOnce(
 		Arc<ParachainClient<RuntimeApi, Executor>>,
+		Arc<ParachainBackend>,
 		ParachainBlockImport<RuntimeApi, Executor>,
 		Option<&Registry>,
 		Option<TelemetryHandle>,
@@ -331,7 +334,7 @@ where
 		task_manager: &mut task_manager,
 		config: parachain_config,
 		keystore: params.keystore_container.keystore(),
-		backend,
+		backend: backend.clone(),
 		network: network.clone(),
 		sync_service: sync_service.clone(),
 		system_rpc_tx,
@@ -391,6 +394,7 @@ where
 	if validator {
 		start_consensus(
 			client.clone(),
+			backend.clone(),
 			block_import,
 			prometheus_registry.as_ref(),
 			telemetry.as_ref().map(|t| t.handle()),
@@ -459,6 +463,7 @@ where
 
 fn start_consensus<RuntimeApi, Executor>(
 	client: Arc<ParachainClient<RuntimeApi, Executor>>,
+	backend: Arc<ParachainBackend>,
 	block_import: ParachainBlockImport<RuntimeApi, Executor>,
 	prometheus_registry: Option<&Registry>,
 	telemetry: Option<TelemetryHandle>,
@@ -486,13 +491,12 @@ where
 		+ sp_block_builder::BlockBuilder<Block>
 		+ sp_consensus_aura::AuraApi<Block, <<AuraId as AppCrypto>::Pair as Pair>::Public>
 		+ cumulus_primitives_core::CollectCollationInfo<Block>
+		+ cumulus_primitives_aura::AuraUnincludedSegmentApi<Block>
 		+ pallet_transaction_payment_rpc::TransactionPaymentRuntimeApi<Block, Balance>
 		+ substrate_frame_rpc_system::AccountNonceApi<Block, AccountId, Nonce>,
 	Executor: NativeExecutionDispatch + 'static,
 {
-	use cumulus_client_consensus_aura::collators::basic::{
-		self as basic_aura, Params as BasicAuraParams,
-	};
+	use cumulus_client_consensus_aura::collators::lookahead::{self as aura, Params as AuraParams};
 
 	// NOTE: because we use Aura here explicitly, we can use `CollatorSybilResistance::Resistant`
 	// when starting the network.
@@ -516,11 +520,15 @@ where
 		client.clone(),
 	);
 
-	let params = BasicAuraParams {
+	let params = AuraParams {
 		create_inherent_data_providers: move |_, ()| async move { Ok(()) },
 		block_import,
-		para_client: client,
+		para_client: client.clone(),
+		para_backend: backend,
 		relay_client: relay_chain_interface,
+		code_hash_provider: move |block_hash| {
+			client.code_at(block_hash).ok().map(ValidationCode).map(|c| c.hash())
+		},
 		sync_oracle,
 		keystore,
 		collator_key,
@@ -531,12 +539,11 @@ where
 		proposer,
 		collator_service,
 		// Very limited proposal time.
-		authoring_duration: Duration::from_millis(500),
-		collation_request_receiver: None,
+		authoring_duration: Duration::from_millis(1500),
 	};
 
 	let fut =
-		basic_aura::run::<Block, sp_consensus_aura::sr25519::AuthorityPair, _, _, _, _, _, _, _>(
+		aura::run::<Block, sp_consensus_aura::sr25519::AuthorityPair, _, _, _, _, _, _, _, _, _>(
 			params,
 		);
 	task_manager.spawn_essential_handle().spawn("aura", None, fut);
@@ -563,6 +570,7 @@ where
 		+ sp_offchain::OffchainWorkerApi<Block>
 		+ sp_block_builder::BlockBuilder<Block>
 		+ cumulus_primitives_core::CollectCollationInfo<Block>
+		+ cumulus_primitives_aura::AuraUnincludedSegmentApi<Block>
 		+ sp_consensus_aura::AuraApi<Block, <<AuraId as AppCrypto>::Pair as Pair>::Public>
 		+ pallet_transaction_payment_rpc::TransactionPaymentRuntimeApi<Block, Balance>
 		+ substrate_frame_rpc_system::AccountNonceApi<Block, AccountId, Nonce>,
diff --git a/runtime/common/src/lib.rs b/runtime/common/src/lib.rs
index 8d28f05..2c35ede 100644
--- a/runtime/common/src/lib.rs
+++ b/runtime/common/src/lib.rs
@@ -19,7 +19,7 @@ pub type Nonce = u32;
 /// up by `pallet_aura` to implement `fn slot_duration()`.
 ///
 /// Change this to adjust the block time.
-pub const MILLISECS_PER_BLOCK: u64 = 12000;
+pub const MILLISECS_PER_BLOCK: u64 = 6000;
 
 // NOTE: Currently it is not possible to change the slot duration after the chain has started.
 // Attempting to do so will brick block production.
@@ -40,6 +40,6 @@ pub const NORMAL_DISPATCH_RATIO: Perbill = Perbill::from_percent(75);
 
 /// We allow for 0.5 of a second of compute with a 12 second average block time.
 pub const MAXIMUM_BLOCK_WEIGHT: Weight = Weight::from_parts(
-	WEIGHT_REF_TIME_PER_SECOND.saturating_div(2),
+	WEIGHT_REF_TIME_PER_SECOND.saturating_mul(2),
 	polkadot_primitives::MAX_POV_SIZE as u64,
 );
diff --git a/runtime/devnet/Cargo.toml b/runtime/devnet/Cargo.toml
index ce9c932..5520b8f 100644
--- a/runtime/devnet/Cargo.toml
+++ b/runtime/devnet/Cargo.toml
@@ -83,6 +83,7 @@ cumulus-pallet-parachain-system = { workspace = true, default-features = false,
 cumulus-pallet-session-benchmarking = { workspace = true, default-features = false }
 cumulus-pallet-xcm = { workspace = true, default-features = false }
 cumulus-pallet-xcmp-queue = { workspace = true, default-features = false }
+cumulus-primitives-aura = { workspace = true, default-features = false }
 cumulus-primitives-core = { workspace = true, default-features = false }
 cumulus-primitives-timestamp = { workspace = true, default-features = false }
 cumulus-primitives-utility = { workspace = true, default-features = false }
@@ -101,6 +102,7 @@ std = [
 	"cumulus-pallet-parachain-system/std",
 	"cumulus-pallet-xcm/std",
 	"cumulus-pallet-xcmp-queue/std",
+	"cumulus-primitives-aura/std",
 	"cumulus-primitives-core/std",
 	"cumulus-primitives-timestamp/std",
 	"cumulus-primitives-utility/std",
diff --git a/runtime/devnet/src/lib.rs b/runtime/devnet/src/lib.rs
index b6e88ca..5ff2d6a 100644
--- a/runtime/devnet/src/lib.rs
+++ b/runtime/devnet/src/lib.rs
@@ -10,7 +10,7 @@ mod weights;
 pub mod xcm_config;
 pub use fee::WeightToFee;
 
-use cumulus_pallet_parachain_system::RelayNumberStrictlyIncreases;
+use cumulus_pallet_parachain_system::RelayNumberMonotonicallyIncreases;
 use cumulus_primitives_core::{AssetId, Concrete};
 use pallet_tx_pause::RuntimeCallNameOf;
 use sp_api::impl_runtime_apis;
@@ -327,6 +327,9 @@ impl pallet_timestamp::Config for Runtime {
 	/// A timestamp: milliseconds since the unix epoch.
 	type Moment = u64;
 	type OnTimestampSet = Aura;
+	#[cfg(feature = "experimental")]
+	type MinimumPeriod = ConstU64<0>;
+	#[cfg(not(feature = "experimental"))]
 	type MinimumPeriod = ConstU64<{ SLOT_DURATION / 2 }>;
 	type WeightInfo = ();
 }
@@ -425,7 +428,7 @@ parameter_types! {
 
 /// Maximum number of blocks simultaneously accepted by the Runtime, not yet included
 /// into the relay chain.
-const UNINCLUDED_SEGMENT_CAPACITY: u32 = 1;
+const UNINCLUDED_SEGMENT_CAPACITY: u32 = 3;
 /// How many parachain blocks are processed by the relay chain per parent. Limits the
 /// number of blocks authored per slot.
 const BLOCK_PROCESSING_VELOCITY: u32 = 1;
@@ -441,15 +444,16 @@ impl cumulus_pallet_parachain_system::Config for Runtime {
 	type ReservedDmpWeight = ReservedDmpWeight;
 	type XcmpMessageHandler = XcmpQueue;
 	type ReservedXcmpWeight = ReservedXcmpWeight;
-	type CheckAssociatedRelayNumber = RelayNumberStrictlyIncreases;
-	type ConsensusHook = cumulus_pallet_aura_ext::FixedVelocityConsensusHook<
-		Runtime,
-		RELAY_CHAIN_SLOT_DURATION_MILLIS,
-		BLOCK_PROCESSING_VELOCITY,
-		UNINCLUDED_SEGMENT_CAPACITY,
-	>;
+	type CheckAssociatedRelayNumber = RelayNumberMonotonicallyIncreases;
+	type ConsensusHook = ConsensusHook;
 }
 
+type ConsensusHook = cumulus_pallet_aura_ext::FixedVelocityConsensusHook<
+	Runtime,
+	RELAY_CHAIN_SLOT_DURATION_MILLIS,
+	BLOCK_PROCESSING_VELOCITY,
+	UNINCLUDED_SEGMENT_CAPACITY,
+>;
 impl parachain_info::Config for Runtime {}
 
 impl cumulus_pallet_aura_ext::Config for Runtime {}
@@ -604,7 +608,9 @@ impl pallet_aura::Config for Runtime {
 	type AuthorityId = AuraId;
 	type MaxAuthorities = ConstU32<100_000>;
 	type DisabledValidators = ();
-	type AllowMultipleBlocksPerSlot = ConstBool<false>;
+	type AllowMultipleBlocksPerSlot = ConstBool<true>;
+	#[cfg(feature = "experimental")]
+	type SlotDuration = ConstU64<SLOT_DURATION>;
 }
 
 parameter_types! {
@@ -777,7 +783,7 @@ mod benches {
 impl_runtime_apis! {
 	impl sp_consensus_aura::AuraApi<Block, AuraId> for Runtime {
 		fn slot_duration() -> sp_consensus_aura::SlotDuration {
-			sp_consensus_aura::SlotDuration::from_millis(Aura::slot_duration())
+			sp_consensus_aura::SlotDuration::from_millis(SLOT_DURATION)
 		}
 
 		fn authorities() -> Vec<AuraId> {
@@ -785,6 +791,15 @@ impl_runtime_apis! {
 		}
 	}
 
+	impl cumulus_primitives_aura::AuraUnincludedSegmentApi<Block> for Runtime {
+		fn can_build_upon(
+			included_hash: <Block as BlockT>::Hash,
+			slot: cumulus_primitives_aura::Slot,
+		) -> bool {
+			ConsensusHook::can_build_upon(included_hash, slot)
+		}
+	}
+
 	impl sp_api::Core<Block> for Runtime {
 		fn version() -> RuntimeVersion {
 			VERSION
diff --git a/runtime/mainnet/Cargo.toml b/runtime/mainnet/Cargo.toml
index 6ee0548..6dcc488 100644
--- a/runtime/mainnet/Cargo.toml
+++ b/runtime/mainnet/Cargo.toml
@@ -83,6 +83,7 @@ cumulus-pallet-parachain-system = { workspace = true, default-features = false,
 cumulus-pallet-session-benchmarking = { workspace = true, default-features = false }
 cumulus-pallet-xcm = { workspace = true, default-features = false }
 cumulus-pallet-xcmp-queue = { workspace = true, default-features = false }
+cumulus-primitives-aura = { workspace = true, default-features = false }
 cumulus-primitives-core = { workspace = true, default-features = false }
 cumulus-primitives-timestamp = { workspace = true, default-features = false }
 cumulus-primitives-utility = { workspace = true, default-features = false }
@@ -101,6 +102,7 @@ std = [
   "cumulus-pallet-parachain-system/std",
   "cumulus-pallet-xcm/std",
   "cumulus-pallet-xcmp-queue/std",
+  "cumulus-primitives-aura/std",
   "cumulus-primitives-core/std",
   "cumulus-primitives-timestamp/std",
   "cumulus-primitives-utility/std",
diff --git a/runtime/mainnet/src/lib.rs b/runtime/mainnet/src/lib.rs
index f4ca304..233ba24 100644
--- a/runtime/mainnet/src/lib.rs
+++ b/runtime/mainnet/src/lib.rs
@@ -10,7 +10,7 @@ mod weights;
 pub mod xcm_config;
 pub use fee::WeightToFee;
 
-use cumulus_pallet_parachain_system::RelayNumberStrictlyIncreases;
+use cumulus_pallet_parachain_system::RelayNumberMonotonicallyIncreases;
 use cumulus_primitives_core::{AssetId, Concrete};
 use pallet_tx_pause::RuntimeCallNameOf;
 use sp_api::impl_runtime_apis;
@@ -324,6 +324,9 @@ impl pallet_timestamp::Config for Runtime {
 	/// A timestamp: milliseconds since the unix epoch.
 	type Moment = u64;
 	type OnTimestampSet = Aura;
+	#[cfg(feature = "experimental")]
+	type MinimumPeriod = ConstU64<0>;
+	#[cfg(not(feature = "experimental"))]
 	type MinimumPeriod = ConstU64<{ SLOT_DURATION / 2 }>;
 	type WeightInfo = ();
 }
@@ -422,7 +425,7 @@ parameter_types! {
 
 /// Maximum number of blocks simultaneously accepted by the Runtime, not yet included
 /// into the relay chain.
-const UNINCLUDED_SEGMENT_CAPACITY: u32 = 1;
+const UNINCLUDED_SEGMENT_CAPACITY: u32 = 3;
 /// How many parachain blocks are processed by the relay chain per parent. Limits the
 /// number of blocks authored per slot.
 const BLOCK_PROCESSING_VELOCITY: u32 = 1;
@@ -438,15 +441,17 @@ impl cumulus_pallet_parachain_system::Config for Runtime {
 	type ReservedDmpWeight = ReservedDmpWeight;
 	type XcmpMessageHandler = XcmpQueue;
 	type ReservedXcmpWeight = ReservedXcmpWeight;
-	type CheckAssociatedRelayNumber = RelayNumberStrictlyIncreases;
-	type ConsensusHook = cumulus_pallet_aura_ext::FixedVelocityConsensusHook<
-		Runtime,
-		RELAY_CHAIN_SLOT_DURATION_MILLIS,
-		BLOCK_PROCESSING_VELOCITY,
-		UNINCLUDED_SEGMENT_CAPACITY,
-	>;
+	type CheckAssociatedRelayNumber = RelayNumberMonotonicallyIncreases;
+	type ConsensusHook = ConsensusHook;
 }
 
+type ConsensusHook = cumulus_pallet_aura_ext::FixedVelocityConsensusHook<
+	Runtime,
+	RELAY_CHAIN_SLOT_DURATION_MILLIS,
+	BLOCK_PROCESSING_VELOCITY,
+	UNINCLUDED_SEGMENT_CAPACITY,
+>;
+
 impl parachain_info::Config for Runtime {}
 
 impl cumulus_pallet_aura_ext::Config for Runtime {}
@@ -601,7 +606,9 @@ impl pallet_aura::Config for Runtime {
 	type AuthorityId = AuraId;
 	type MaxAuthorities = ConstU32<100_000>;
 	type DisabledValidators = ();
-	type AllowMultipleBlocksPerSlot = ConstBool<false>;
+	type AllowMultipleBlocksPerSlot = ConstBool<true>;
+	#[cfg(feature = "experimental")]
+	type SlotDuration = ConstU64<SLOT_DURATION>;
 }
 
 parameter_types! {
@@ -774,7 +781,7 @@ mod benches {
 impl_runtime_apis! {
 	impl sp_consensus_aura::AuraApi<Block, AuraId> for Runtime {
 		fn slot_duration() -> sp_consensus_aura::SlotDuration {
-			sp_consensus_aura::SlotDuration::from_millis(Aura::slot_duration())
+			sp_consensus_aura::SlotDuration::from_millis(SLOT_DURATION)
 		}
 
 		fn authorities() -> Vec<AuraId> {
@@ -782,6 +789,15 @@ impl_runtime_apis! {
 		}
 	}
 
+	impl cumulus_primitives_aura::AuraUnincludedSegmentApi<Block> for Runtime {
+		fn can_build_upon(
+			included_hash: <Block as BlockT>::Hash,
+			slot: cumulus_primitives_aura::Slot,
+		) -> bool {
+			ConsensusHook::can_build_upon(included_hash, slot)
+		}
+	}
+
 	impl sp_api::Core<Block> for Runtime {
 		fn version() -> RuntimeVersion {
 			VERSION