diff --git a/pallas-chainsync/Cargo.toml b/pallas-chainsync/Cargo.toml
index 0e15da4..d169474 100644
--- a/pallas-chainsync/Cargo.toml
+++ b/pallas-chainsync/Cargo.toml
@@ -21,7 +21,7 @@ hex = "0.4.3"
 
 [dev-dependencies]
 net2 = "0.2.37"
-cryptoxide = "0.3.6"
+cryptoxide = "0.4.1"
 env_logger = "0.9.0"
 pallas-handshake = { version = "0.3.0", path = "../pallas-handshake/" }
 pallas-txsubmission = { version = "0.3.0", path = "../pallas-txsubmission/" }
diff --git a/pallas-crypto/Cargo.toml b/pallas-crypto/Cargo.toml
index 21bc32f..b583f17 100644
--- a/pallas-crypto/Cargo.toml
+++ b/pallas-crypto/Cargo.toml
@@ -15,7 +15,7 @@ authors = [
 [dependencies]
 minicbor = { version = "0.12" }
 hex = "0.4"
-cryptoxide = { version = "0.3.6" }
+cryptoxide = { version = "0.4.1" }
 thiserror = "1.0"
 rand_core = "0.6"
 
diff --git a/pallas-crypto/src/key/ed25519.rs b/pallas-crypto/src/key/ed25519.rs
index 3d33c8d..4d7a3af 100644
--- a/pallas-crypto/src/key/ed25519.rs
+++ b/pallas-crypto/src/key/ed25519.rs
@@ -11,7 +11,7 @@
 
 use crate::memsec::Scrubbed as _;
 use cryptoxide::ed25519::{
-    self, PRIVATE_KEY_LENGTH, PUBLIC_KEY_LENGTH, SEED_LENGTH, SIGNATURE_LENGTH,
+    self, EXTENDED_KEY_LENGTH, PRIVATE_KEY_LENGTH, PUBLIC_KEY_LENGTH, SIGNATURE_LENGTH,
 };
 use rand_core::{CryptoRng, RngCore};
 use std::{any::type_name, convert::TryFrom, fmt, str::FromStr};
@@ -70,8 +70,8 @@ macro_rules! impl_size_zero {
     };
 }
 
-impl_size_zero!(SecretKey, SEED_LENGTH);
-impl_size_zero!(SecretKeyExtended, PRIVATE_KEY_LENGTH);
+impl_size_zero!(SecretKey, PRIVATE_KEY_LENGTH);
+impl_size_zero!(SecretKeyExtended, EXTENDED_KEY_LENGTH);
 impl_size_zero!(PublicKey, PUBLIC_KEY_LENGTH);
 impl_size_zero!(Signature, SIGNATURE_LENGTH);
 
@@ -161,7 +161,7 @@ impl SecretKeyExtended {
     /// [`Signature`] generated with this [`SecretKeyExtended`] and the original
     /// message.
     pub fn public_key(&self) -> PublicKey {
-        let pk = ed25519::to_public(&self.0);
+        let pk = ed25519::extended_to_public(&self.0);
 
         PublicKey::from(pk)
     }
@@ -186,7 +186,7 @@ impl PublicKey {
     where
         T: AsRef<[u8]>,
     {
-        ed25519::verify(message.as_ref(), &self.0, signature.as_ref())
+        ed25519::verify(message.as_ref(), &self.0, &signature.0)
     }
 }