diff --git a/pallet/message-gadget/src/lib.rs b/pallet/message-gadget/src/lib.rs
index e36ca4b4..987ac7eb 100644
--- a/pallet/message-gadget/src/lib.rs
+++ b/pallet/message-gadget/src/lib.rs
@@ -27,7 +27,7 @@ use frame_support::{log, pallet_prelude::*, traits::Get};
 use frame_system::pallet_prelude::*;
 use sp_core::{H160, H256};
 use sp_io::hashing;
-use sp_std::vec;
+use sp_std::prelude::*;
 
 #[frame_support::pallet]
 pub mod pallet {
diff --git a/precompile/bls12-381/src/lib.rs b/precompile/bls12-381/src/lib.rs
index 7016a915..fbfa4b1e 100644
--- a/precompile/bls12-381/src/lib.rs
+++ b/precompile/bls12-381/src/lib.rs
@@ -25,7 +25,7 @@ use milagro_bls::{AggregatePublicKey, AggregateSignature, PublicKey, Signature};
 // moonbeam
 use precompile_utils::prelude::*;
 // substrate
-use sp_std::vec::Vec;
+use sp_std::prelude::*;
 
 pub(crate) const VERIFY_ESTIMATED_COST: u64 = 100_000;
 pub struct BLS12381<T>(PhantomData<T>);
diff --git a/precompile/staking/src/lib.rs b/precompile/staking/src/lib.rs
index d5fef1e3..8724462e 100644
--- a/precompile/staking/src/lib.rs
+++ b/precompile/staking/src/lib.rs
@@ -36,7 +36,7 @@ use frame_support::{
 };
 use sp_core::{H160, U256};
 use sp_runtime::Perbill;
-use sp_std::vec::Vec;
+use sp_std::prelude::*;
 
 pub struct Staking<Runtime>(PhantomData<Runtime>);
 
diff --git a/runtime/pangolin/src/migration.rs b/runtime/pangolin/src/migration.rs
index 0c9a8e76..d4e49525 100644
--- a/runtime/pangolin/src/migration.rs
+++ b/runtime/pangolin/src/migration.rs
@@ -1,12 +1,13 @@
 // darwinia
 #[allow(unused_imports)]
 use crate::*;
+// substrate
 
 pub struct CustomOnRuntimeUpgrade;
 impl frame_support::traits::OnRuntimeUpgrade for CustomOnRuntimeUpgrade {
 	#[cfg(feature = "try-runtime")]
-	fn pre_upgrade() -> Result<sp_std::vec::Vec<u8>, &'static str> {
-		Ok(sp_std::vec::Vec::new())
+	fn pre_upgrade() -> Result<Vec<u8>, &'static str> {
+		Ok(Vec::new())
 	}
 
 	#[cfg(feature = "try-runtime")]
diff --git a/runtime/pangoro/src/migration.rs b/runtime/pangoro/src/migration.rs
index 9de79197..4650e4bb 100644
--- a/runtime/pangoro/src/migration.rs
+++ b/runtime/pangoro/src/migration.rs
@@ -23,8 +23,8 @@ use crate::*;
 pub struct CustomOnRuntimeUpgrade;
 impl frame_support::traits::OnRuntimeUpgrade for CustomOnRuntimeUpgrade {
 	#[cfg(feature = "try-runtime")]
-	fn pre_upgrade() -> Result<sp_std::vec::Vec<u8>, &'static str> {
-		Ok(sp_std::vec::Vec::new())
+	fn pre_upgrade() -> Result<Vec<u8>, &'static str> {
+		Ok(Vec::new())
 	}
 
 	#[cfg(feature = "try-runtime")]