diff --git a/Cargo.lock b/Cargo.lock
index b07af1123fd0..47483d2ae351 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -5144,7 +5144,7 @@ dependencies = [
 [[package]]
 name = "fflonk"
 version = "0.1.0"
-source = "git+https://github.com/w3f/fflonk#26a5045b24e169cffc1f9328ca83d71061145c40"
+source = "git+https://github.com/w3f/fflonk#1e854f35e9a65d08b11a86291405cdc95baa0a35"
 dependencies = [
  "ark-ec",
  "ark-ff",
@@ -19316,7 +19316,7 @@ checksum = "97fee6b57c6a41524a810daee9286c02d7752c4253064d0b05472833a438f675"
 dependencies = [
  "cfg-if",
  "digest 0.10.7",
- "rand 0.8.5",
+ "rand 0.7.3",
  "static_assertions",
 ]
 
diff --git a/substrate/client/executor/src/executor.rs b/substrate/client/executor/src/executor.rs
index 7c292a83da08..7410cc1b2ba7 100644
--- a/substrate/client/executor/src/executor.rs
+++ b/substrate/client/executor/src/executor.rs
@@ -565,6 +565,7 @@ pub struct NativeElseWasmExecutor<D: NativeExecutionDispatch> {
 	/// Fallback wasm executor.
 	wasm:
 		WasmExecutor<ExtendedHostFunctions<sp_io::SubstrateHostFunctions, D::ExtendHostFunctions>>,
+	gear_force_native: bool,
 }
 
 impl<D: NativeExecutionDispatch> NativeElseWasmExecutor<D> {
@@ -601,7 +602,11 @@ impl<D: NativeExecutionDispatch> NativeElseWasmExecutor<D> {
 			.with_runtime_cache_size(runtime_cache_size)
 			.build();
 
-		NativeElseWasmExecutor { native_version: D::native_version(), wasm }
+		NativeElseWasmExecutor {
+			native_version: D::native_version(),
+			wasm,
+			gear_force_native: false,
+		}
 	}
 
 	/// Create a new instance using the given [`WasmExecutor`].
@@ -610,7 +615,7 @@ impl<D: NativeExecutionDispatch> NativeElseWasmExecutor<D> {
 			ExtendedHostFunctions<sp_io::SubstrateHostFunctions, D::ExtendHostFunctions>,
 		>,
 	) -> Self {
-		Self { native_version: D::native_version(), wasm: executor }
+		Self { native_version: D::native_version(), wasm: executor, gear_force_native: false }
 	}
 
 	/// Ignore missing function imports if set true.
@@ -618,6 +623,10 @@ impl<D: NativeExecutionDispatch> NativeElseWasmExecutor<D> {
 	pub fn allow_missing_host_functions(&mut self, allow_missing_host_functions: bool) {
 		self.wasm.allow_missing_host_functions = allow_missing_host_functions
 	}
+
+	pub fn gear_force_native(&mut self) {
+		self.gear_force_native = true;
+	}
 }
 
 impl<D: NativeExecutionDispatch> RuntimeVersionOf for NativeElseWasmExecutor<D> {
@@ -645,7 +654,7 @@ impl<D: NativeExecutionDispatch + 'static> CodeExecutor for NativeElseWasmExecut
 		runtime_code: &RuntimeCode,
 		method: &str,
 		data: &[u8],
-		use_native: bool,
+		mut use_native: bool,
 		context: CallContext,
 	) -> (Result<Vec<u8>>, bool) {
 		tracing::trace!(
@@ -654,6 +663,10 @@ impl<D: NativeExecutionDispatch + 'static> CodeExecutor for NativeElseWasmExecut
 			"Executing function",
 		);
 
+		if self.gear_force_native {
+			use_native = true;
+		}
+
 		let on_chain_heap_alloc_strategy = if self.wasm.ignore_onchain_heap_pages {
 			self.wasm.default_onchain_heap_alloc_strategy
 		} else {
@@ -711,7 +724,11 @@ impl<D: NativeExecutionDispatch + 'static> CodeExecutor for NativeElseWasmExecut
 
 impl<D: NativeExecutionDispatch> Clone for NativeElseWasmExecutor<D> {
 	fn clone(&self) -> Self {
-		NativeElseWasmExecutor { native_version: D::native_version(), wasm: self.wasm.clone() }
+		NativeElseWasmExecutor {
+			native_version: D::native_version(),
+			wasm: self.wasm.clone(),
+			gear_force_native: self.gear_force_native,
+		}
 	}
 }
 
diff --git a/substrate/primitives/externalities/src/lib.rs b/substrate/primitives/externalities/src/lib.rs
index 411ec97a6b82..41ebf8edd150 100644
--- a/substrate/primitives/externalities/src/lib.rs
+++ b/substrate/primitives/externalities/src/lib.rs
@@ -309,6 +309,11 @@ pub trait Externalities: ExtensionStore {
 	///
 	/// Get all the keys that have been read or written to during the benchmark.
 	fn get_read_and_written_keys(&self) -> Vec<(Vec<u8>, u32, u32, bool)>;
+
+	/// Access to `OverlayChanges<H>` for `gear-tasks`.
+	fn gear_overlayed_changes(&self) -> Option<Box<dyn Any + Send>> {
+		None
+	}
 }
 
 /// Extension for the [`Externalities`] trait.
diff --git a/substrate/primitives/state-machine/src/ext.rs b/substrate/primitives/state-machine/src/ext.rs
index 11df46f2a4a3..b3cee955a1fa 100644
--- a/substrate/primitives/state-machine/src/ext.rs
+++ b/substrate/primitives/state-machine/src/ext.rs
@@ -159,7 +159,7 @@ where
 
 impl<'a, H, B> Externalities for Ext<'a, H, B>
 where
-	H: Hasher,
+	H: Hasher + 'static,
 	H::Out: Ord + 'static + codec::Codec,
 	B: Backend<H>,
 {
@@ -651,6 +651,10 @@ where
 	fn get_read_and_written_keys(&self) -> Vec<(Vec<u8>, u32, u32, bool)> {
 		self.backend.get_read_and_written_keys()
 	}
+
+	fn gear_overlayed_changes(&self) -> Option<Box<dyn Any + Send>> {
+		Some(Box::new(self.overlay.clone()))
+	}
 }
 
 impl<'a, H, B> Ext<'a, H, B>
diff --git a/substrate/primitives/state-machine/src/lib.rs b/substrate/primitives/state-machine/src/lib.rs
index 0e2b9bfdfffc..a6baf91b3d40 100644
--- a/substrate/primitives/state-machine/src/lib.rs
+++ b/substrate/primitives/state-machine/src/lib.rs
@@ -223,7 +223,7 @@ mod execution {
 
 	impl<'a, B, H, Exec> StateMachine<'a, B, H, Exec>
 	where
-		H: Hasher,
+		H: Hasher + 'static,
 		H::Out: Ord + 'static + codec::Codec,
 		Exec: CodeExecutor + Clone + 'static,
 		B: Backend<H>,
@@ -318,7 +318,7 @@ mod execution {
 	) -> Result<(Vec<u8>, StorageProof), Box<dyn Error>>
 	where
 		B: AsTrieBackend<H>,
-		H: Hasher,
+		H: Hasher + 'static,
 		H::Out: Ord + 'static + codec::Codec,
 		Exec: CodeExecutor + Clone + 'static,
 	{
@@ -354,7 +354,7 @@ mod execution {
 	) -> Result<(Vec<u8>, StorageProof), Box<dyn Error>>
 	where
 		S: trie_backend_essence::TrieBackendStorage<H>,
-		H: Hasher,
+		H: Hasher + 'static,
 		H::Out: Ord + 'static + codec::Codec,
 		Exec: CodeExecutor + 'static + Clone,
 	{
@@ -416,7 +416,7 @@ mod execution {
 		runtime_code: &RuntimeCode,
 	) -> Result<Vec<u8>, Box<dyn Error>>
 	where
-		H: Hasher,
+		H: Hasher + 'static,
 		H::Out: Ord + 'static + codec::Codec,
 		Exec: CodeExecutor + Clone + 'static,
 	{