diff --git a/Cargo.toml b/Cargo.toml
index 6bbc55a..bada9b9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,16 +1,16 @@
 [package]
 name = "libsm"
-version = "0.4.1"
+version = "0.5.0"
 authors = [
     "Tang Zongxun <tangzongxun@hotmail.com>",
     "Niu Junxiang <494521900@qq.com>",
     "yieazy <yuitta@163.com>",
     "Rivtower Technologies <contact@rivtower.com>"
 ]
-
 description = "A Rust Library of China's Standards of Encryption Algorithms (SM2/3/4)"
 keywords = ["cipher", "cryptography"]
 license = "Apache-2.0"
+edition = "2021"
 
 [dependencies]
 rand = "0.8"
diff --git a/src/sm2/ecc.rs b/src/sm2/ecc.rs
index 3a2f024..6f62250 100644
--- a/src/sm2/ecc.rs
+++ b/src/sm2/ecc.rs
@@ -606,7 +606,7 @@ impl Point {
     }
 }
 
-use sm2::error::{Sm2Error, Sm2Result};
+use crate::sm2::error::{Sm2Error, Sm2Result};
 use std::fmt;
 
 impl fmt::Display for Point {
@@ -780,10 +780,11 @@ mod tests {
 
 #[cfg(feature = "internal_benches")]
 mod internal_benches {
+    use crate::sm2::ecc::EccCtx;
+    use crate::sm2::field::FieldElem;
+
     use num_bigint::BigUint;
     use num_traits::Num;
-    use sm2::ecc::EccCtx;
-    use sm2::field::FieldElem;
 
     extern crate test;
 
diff --git a/src/sm2/encrypt.rs b/src/sm2/encrypt.rs
index 3154e94..7e782a6 100644
--- a/src/sm2/encrypt.rs
+++ b/src/sm2/encrypt.rs
@@ -1,10 +1,9 @@
 use num_bigint::BigUint;
 use num_traits::One;
 
-use crate::{sm2::util::kdf, sm3::hash::Sm3Hash};
-
 use super::ecc::{EccCtx, Point};
-use sm2::error::{Sm2Error, Sm2Result};
+use crate::sm2::error::{Sm2Error, Sm2Result};
+use crate::{sm2::util::kdf, sm3::hash::Sm3Hash};
 
 pub struct EncryptCtx {
     klen: usize,
diff --git a/src/sm2/exchange.rs b/src/sm2/exchange.rs
index aadd4c2..1b8a2c6 100644
--- a/src/sm2/exchange.rs
+++ b/src/sm2/exchange.rs
@@ -1,10 +1,11 @@
 use super::ecc::*;
 use super::util::kdf;
+use crate::sm2::error::{Sm2Error, Sm2Result};
+use crate::sm3::hash::Sm3Hash;
+
 use byteorder::{BigEndian, WriteBytesExt};
 use num_bigint::BigUint;
 use num_traits::*;
-use sm2::error::{Sm2Error, Sm2Result};
-use sm3::hash::Sm3Hash;
 
 fn compute_z(id: &str, pk: &Point) -> Sm2Result<[u8; 32]> {
     let curve = EccCtx::new();
diff --git a/src/sm2/field.rs b/src/sm2/field.rs
index 78645df..e6cbbcb 100644
--- a/src/sm2/field.rs
+++ b/src/sm2/field.rs
@@ -14,10 +14,11 @@
 
 // Implementation of the prime field(SCA-256) used by SM2
 
+use crate::sm2::error::{Sm2Error, Sm2Result};
+
 use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
 use num_bigint::BigUint;
 use num_traits::Num;
-use sm2::error::{Sm2Error, Sm2Result};
 use std::io::Cursor;
 
 pub struct FieldCtx {
diff --git a/src/sm2/signature.rs b/src/sm2/signature.rs
index 2fc89ce..14d19c4 100644
--- a/src/sm2/signature.rs
+++ b/src/sm2/signature.rs
@@ -12,17 +12,16 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+use crate::sm2::error::{Sm2Error, Sm2Result};
+use crate::sm3::hash::Sm3Hash;
+
 use super::ecc::*;
 use super::field::FieldElem;
+use byteorder::{BigEndian, WriteBytesExt};
 use num_bigint::BigUint;
 use num_traits::*;
-use sm3::hash::Sm3Hash;
-
-use yasna;
-
-use byteorder::{BigEndian, WriteBytesExt};
-use sm2::error::{Sm2Error, Sm2Result};
 use std::fmt;
+use yasna;
 
 pub type Pubkey = Point;
 pub type Seckey = BigUint;
diff --git a/src/sm3/hash.rs b/src/sm3/hash.rs
index 49f8bd1..e388f36 100644
--- a/src/sm3/hash.rs
+++ b/src/sm3/hash.rs
@@ -17,7 +17,7 @@
 // Input:"abc"
 // Output:66c7f0f4 62eeedd9 d1f2d46b dc10e4e2 4167c487 5cf2f7a2 297da02b 8f4ba8e0
 
-use sm3::error::{Sm3Error, Sm3Result};
+use crate::sm3::error::{Sm3Error, Sm3Result};
 
 // Sample 2
 // Input:"abcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcd"
diff --git a/src/sm4/cipher.rs b/src/sm4/cipher.rs
index 4c3c7cc..fc59d29 100644
--- a/src/sm4/cipher.rs
+++ b/src/sm4/cipher.rs
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use sm4::error::{Sm4Error, Sm4Result};
+use crate::sm4::error::{Sm4Error, Sm4Result};
 
 static SBOX: [u8; 256] = [
     0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7, 0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c, 0x05,
diff --git a/src/sm4/cipher_mode.rs b/src/sm4/cipher_mode.rs
index 66105f6..c768d23 100644
--- a/src/sm4/cipher_mode.rs
+++ b/src/sm4/cipher_mode.rs
@@ -13,7 +13,7 @@
 // limitations under the License.
 
 use super::cipher::Sm4Cipher;
-use sm4::error::{Sm4Error, Sm4Result};
+use crate::sm4::error::{Sm4Error, Sm4Result};
 
 pub enum CipherMode {
     Cfb,