diff --git a/Cargo.toml b/Cargo.toml
index 04a8f17..eebee30 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -48,13 +48,13 @@ serde = { version = "1.0", default-features = false, features = [ "alloc" ], opt
 zeroize = { version = "1.5", features = ["zeroize_derive"], optional = true }
 
 # Unexported dependnecies
-bitcoin_hashes = { version = "0.11.0", default-features = false }
+bitcoin_hashes = { version = ">=0.12, <=0.13", default-features = false }
 unicode-normalization = { version = "=0.1.22", optional = true }
 
 [dev-dependencies]
 # Enabling the "rand" feature by default to run the benches
 bip39 = { path = ".", features = ["rand"] }
-bitcoin_hashes = "0.11.0" # enable default features for test
+bitcoin_hashes = ">=0.12,<=0.13" # enable default features for test
 
 
 [package.metadata.docs.rs]
diff --git a/src/pbkdf2.rs b/src/pbkdf2.rs
index e7d3375..326ca55 100644
--- a/src/pbkdf2.rs
+++ b/src/pbkdf2.rs
@@ -112,7 +112,7 @@ pub(crate) fn pbkdf2<M>(mnemonic: M, unprefixed_salt: &[u8], c: usize, res: &mut
 			prfc.input(unprefixed_salt);
 			prfc.input(&u32_to_array_be((i + 1) as u32));
 
-			let salt = hmac::Hmac::from_engine(prfc).into_inner();
+			let salt = hmac::Hmac::from_engine(prfc).to_byte_array();
 			xor(chunk, &salt);
 			salt
 		};
@@ -120,7 +120,7 @@ pub(crate) fn pbkdf2<M>(mnemonic: M, unprefixed_salt: &[u8], c: usize, res: &mut
 		for _ in 1..c {
 			let mut prfc = prf.clone();
 			prfc.input(&salt);
-			salt = hmac::Hmac::from_engine(prfc).into_inner();
+			salt = hmac::Hmac::from_engine(prfc).to_byte_array();
 
 			xor(chunk, &salt);
 		}