diff --git a/tests/Cargo.lock b/tests/Cargo.lock
index 741514b..51c7381 100644
--- a/tests/Cargo.lock
+++ b/tests/Cargo.lock
@@ -106,9 +106,9 @@ dependencies = [
 
 [[package]]
 name = "buddy-alloc"
-version = "0.5.1"
+version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1f0d2da64a6a895d5a7e0724882825d50f83c13396b1b9f1878e19a024bab395"
+checksum = "ee741d62dcaf41ca303576ef890989ccb01d5dd77f8ce1a6d6c7846ab5d09efb"
 
 [[package]]
 name = "byteorder"
diff --git a/tests/contracts/exec-child/src/main.rs b/tests/contracts/exec-child/src/main.rs
index e1437c0..b150e9a 100644
--- a/tests/contracts/exec-child/src/main.rs
+++ b/tests/contracts/exec-child/src/main.rs
@@ -12,6 +12,9 @@ ckb_std::entry!(program_entry);
 default_alloc!();
 use ckb_std_wrapper::ckb_std;
 
+#[cfg(not(any(feature = "native-simulator", test)))]
+use alloc::format;
+
 pub fn program_entry() -> i8 {
     ckb_std::debug!("This is a sample contract exec-child!");
 
diff --git a/tests/contracts/exec-parent/src/main.rs b/tests/contracts/exec-parent/src/main.rs
index 506c230..30625e9 100644
--- a/tests/contracts/exec-parent/src/main.rs
+++ b/tests/contracts/exec-parent/src/main.rs
@@ -18,6 +18,9 @@ use ckb_std::ckb_types::prelude::Unpack;
 use ckb_std::debug;
 use core::ffi::CStr;
 
+#[cfg(not(any(feature = "native-simulator", test)))]
+use alloc::format;
+
 pub fn program_entry() -> i8 {
     debug!("This is a sample contract exec-parent!");
 
diff --git a/tests/contracts/spawn-cases/src/main.rs b/tests/contracts/spawn-cases/src/main.rs
index ba047d4..3555480 100644
--- a/tests/contracts/spawn-cases/src/main.rs
+++ b/tests/contracts/spawn-cases/src/main.rs
@@ -19,6 +19,9 @@ use ckb_std_wrapper::ckb_std;
 use core::ffi::CStr;
 use spawn_cmd::SpawnCasesCmd;
 
+#[cfg(not(any(feature = "native-simulator", test)))]
+use alloc::format;
+
 const CKB_STDIN: usize = 0;
 const CKB_STDOUT: usize = 1;
 
diff --git a/tests/contracts/spawn-child/src/main.rs b/tests/contracts/spawn-child/src/main.rs
index 61c4fea..8fffa34 100644
--- a/tests/contracts/spawn-child/src/main.rs
+++ b/tests/contracts/spawn-child/src/main.rs
@@ -18,6 +18,9 @@ use alloc::{
 use ckb_std::{debug, syscalls};
 use spawn_cmd::SpawnCmd;
 
+#[cfg(not(any(feature = "native-simulator", test)))]
+use alloc::format;
+
 pub fn program_entry() -> i8 {
     debug!("-B- Spawn-Child(pid:{}) Begin --", syscalls::process_id());
 
diff --git a/tests/contracts/spawn-parent/src/main.rs b/tests/contracts/spawn-parent/src/main.rs
index 173ea93..7aa226f 100644
--- a/tests/contracts/spawn-parent/src/main.rs
+++ b/tests/contracts/spawn-parent/src/main.rs
@@ -24,6 +24,9 @@ use ckb_std::{
 use core::ffi::CStr;
 use spawn_cmd::SpawnCmd;
 
+#[cfg(not(any(feature = "native-simulator", test)))]
+use alloc::format;
+
 pub fn program_entry() -> i8 {
     debug!("-A- SpawnParent(pid:{}) Begin --", syscalls::process_id());
 
diff --git a/tests/libs/ckb-std-wrapper/Cargo.toml b/tests/libs/ckb-std-wrapper/Cargo.toml
index 93a516c..b7df6b9 100644
--- a/tests/libs/ckb-std-wrapper/Cargo.toml
+++ b/tests/libs/ckb-std-wrapper/Cargo.toml
@@ -7,5 +7,5 @@ edition = "2021"
 native-simulator = ["ckb-std/native-simulator"]
 
 [dependencies]
-ckb-std = { git = "https://github.com/joii2020/ckb-std.git", rev = "a4dfebc" }
+ckb-std = { git = "https://github.com/nervosnetwork/ckb-std.git", rev = "ef251e2" }
 # ckb-std = { path = "../../../../ckb-std" }