diff --git a/crates/iota-crypto/src/secp256k1.rs b/crates/iota-crypto/src/secp256k1.rs
index bc8bbdee2..d2de07e06 100644
--- a/crates/iota-crypto/src/secp256k1.rs
+++ b/crates/iota-crypto/src/secp256k1.rs
@@ -120,7 +120,7 @@ impl crate::PrivateKeyExt for Secp256k1PrivateKey {
     const SCHEME: SignatureScheme = SignatureScheme::Secp256k1;
 
     fn to_bytes(&self) -> Vec<u8> {
-        self.0.to_bytes().as_slice().to_vec()
+        self.0.to_bytes().to_vec()
     }
 
     fn from_raw_bytes(bytes: &[u8]) -> Result<Self, crate::PrivateKeyError> {
diff --git a/crates/iota-crypto/src/secp256r1.rs b/crates/iota-crypto/src/secp256r1.rs
index 4f325e9d5..6eac52bd9 100644
--- a/crates/iota-crypto/src/secp256r1.rs
+++ b/crates/iota-crypto/src/secp256r1.rs
@@ -120,7 +120,7 @@ impl crate::PrivateKeyExt for Secp256r1PrivateKey {
     const SCHEME: SignatureScheme = SignatureScheme::Secp256r1;
 
     fn to_bytes(&self) -> Vec<u8> {
-        self.0.to_bytes().as_slice().to_vec()
+        self.0.to_bytes().to_vec()
     }
 
     fn from_raw_bytes(bytes: &[u8]) -> Result<Self, crate::PrivateKeyError> {
diff --git a/crates/iota-sdk-types/src/hash.rs b/crates/iota-sdk-types/src/hash.rs
index e0b346048..90da435c3 100644
--- a/crates/iota-sdk-types/src/hash.rs
+++ b/crates/iota-sdk-types/src/hash.rs
@@ -29,7 +29,7 @@ impl Hasher {
         let mut buf = [0; Digest::LENGTH];
         let result = self.0.finalize();
 
-        buf.copy_from_slice(result.as_slice());
+        buf.copy_from_slice(&result);
 
         Digest::new(buf)
     }