diff --git a/curve25519-dalek/Cargo.toml b/curve25519-dalek/Cargo.toml
index ef7a0ad..b785725 100644
--- a/curve25519-dalek/Cargo.toml
+++ b/curve25519-dalek/Cargo.toml
@@ -30,7 +30,7 @@ rustdoc-args = [
 features = ["serde", "rand_core", "digest", "legacy_compatibility", "group-bits"]
 
 [dev-dependencies]
-sha2 = { version = "0.10", default-features = false }
+sha2 = { version = "0.11.0-rc.0", default-features = false }
 bincode = "1"
 criterion = { version = "0.5", features = ["html_reports"] }
 hex = "0.4.2"
@@ -50,8 +50,8 @@ cfg-if = "1"
 ff = { version = "0.13", default-features = false, optional = true }
 group = { version = "0.13", default-features = false, optional = true }
 rand_core = { version = "0.6.4", default-features = false, optional = true }
-digest = { version = "0.10", default-features = false, optional = true }
-subtle = { version = "2.6.0", default-features = false, features = ["const-generics"]}
+digest = { version = "0.11.0-rc.0", default-features = false, optional = true, features = ["block-api"] }
+subtle = { version = "2.6.0", default-features = false, features = ["const-generics"] }
 serde = { version = "1.0", default-features = false, optional = true, features = ["derive"] }
 zeroize = { version = "1", default-features = false, optional = true }
 
@@ -68,7 +68,7 @@ precomputed-tables = []
 legacy_compatibility = []
 group = ["dep:group", "rand_core"]
 group-bits = ["group", "ff/bits"]
-digest = ["dep:digest", "digest/core-api"]
+digest = ["dep:digest"]
 
 [target.'cfg(all(not(curve25519_dalek_backend = "fiat"), not(curve25519_dalek_backend = "serial"), target_arch = "x86_64"))'.dependencies]
 curve25519-dalek-derive = { version = "0.1", path = "../curve25519-dalek-derive" }
diff --git a/curve25519-dalek/src/edwards.rs b/curve25519-dalek/src/edwards.rs
index 2031e17..d1f0089 100644
--- a/curve25519-dalek/src/edwards.rs
+++ b/curve25519-dalek/src/edwards.rs
@@ -106,8 +106,8 @@ use core::ops::{Mul, MulAssign};
 
 #[cfg(feature = "digest")]
 use digest::{
-    Digest, FixedOutput, HashMarker, consts::True, crypto_common::BlockSizeUser,
-    generic_array::typenum::U64, typenum::IsGreater,
+    Digest, FixedOutput, HashMarker, array::typenum::U64, consts::True,
+    crypto_common::BlockSizeUser, typenum::IsGreater,
 };
 
 #[cfg(feature = "group")]
diff --git a/curve25519-dalek/src/field.rs b/curve25519-dalek/src/field.rs
index d1214ac..db2d9aa 100644
--- a/curve25519-dalek/src/field.rs
+++ b/curve25519-dalek/src/field.rs
@@ -38,8 +38,8 @@ use crate::constants;
 #[cfg(feature = "digest")]
 use digest::{
     Digest, FixedOutput, HashMarker,
-    core_api::BlockSizeUser,
-    generic_array::{GenericArray, typenum::U64},
+    array::{Array, typenum::U64},
+    block_api::BlockSizeUser,
     typenum::{IsGreater, True},
 };
 
@@ -368,7 +368,7 @@ impl FieldElement {
         D::BlockSize: IsGreater<D::OutputSize, Output = True>,
     {
         let l_i_b_str = 48u16.to_be_bytes();
-        let z_pad = GenericArray::<u8, D::BlockSize>::default();
+        let z_pad = Array::<u8, D::BlockSize>::default();
 
         let mut hasher = D::new().chain_update(z_pad);
 
diff --git a/curve25519-dalek/src/ristretto.rs b/curve25519-dalek/src/ristretto.rs
index 0edfb09..c7446d9 100644
--- a/curve25519-dalek/src/ristretto.rs
+++ b/curve25519-dalek/src/ristretto.rs
@@ -175,7 +175,7 @@ use rand_core::CryptoRngCore;
 #[cfg(feature = "digest")]
 use digest::Digest;
 #[cfg(feature = "digest")]
-use digest::generic_array::typenum::U64;
+use digest::array::typenum::U64;
 
 use crate::constants;
 use crate::field::FieldElement;
diff --git a/curve25519-dalek/src/scalar.rs b/curve25519-dalek/src/scalar.rs
index 0f12fa7..8b61690 100644
--- a/curve25519-dalek/src/scalar.rs
+++ b/curve25519-dalek/src/scalar.rs
@@ -136,7 +136,7 @@ use rand_core::CryptoRngCore;
 #[cfg(feature = "digest")]
 use digest::Digest;
 #[cfg(feature = "digest")]
-use digest::generic_array::typenum::U64;
+use digest::array::typenum::U64;
 
 use subtle::Choice;
 use subtle::ConditionallySelectable;
diff --git a/ed25519-dalek/Cargo.toml b/ed25519-dalek/Cargo.toml
index 2dd9201..be1928c 100644
--- a/ed25519-dalek/Cargo.toml
+++ b/ed25519-dalek/Cargo.toml
@@ -27,9 +27,9 @@ features = ["batch", "digest", "hazmat", "pem", "serde"]
 
 [dependencies]
 curve25519-dalek = { version = "=5.0.0-pre", path = "../curve25519-dalek", default-features = false, features = ["digest"] }
-ed25519 = { version = ">=2.2, <2.3", default-features = false }
-signature = { version = ">=2.0, <2.3", optional = true, default-features = false }
-sha2 = { version = "0.10", default-features = false }
+ed25519 = { version = "=3.0.0-pre.0", default-features = false }
+signature = { version = "=3.0.0-rc.1", optional = true, default-features = false }
+sha2 = { version = "0.11.0-rc.0", default-features = false }
 subtle = { version = "2.3.0", default-features = false }
 
 # optional features
@@ -41,8 +41,8 @@ zeroize = { version = "1.5", default-features = false, optional = true }
 [dev-dependencies]
 curve25519-dalek = { version = "=5.0.0-pre", path = "../curve25519-dalek", default-features = false, features = ["digest", "rand_core"] }
 x25519-dalek = { version = "=3.0.0-pre", path = "../x25519-dalek", default-features = false, features = ["static_secrets"] }
-blake2 = "0.10"
-sha3 = "0.10"
+blake2 = "0.11.0-rc.0"
+sha3 = "0.11.0-rc.0"
 hex = "0.4"
 bincode = "1.0"
 serde_json = "1.0"
@@ -62,10 +62,9 @@ required-features = ["rand_core"]
 
 [features]
 default = ["fast", "std", "zeroize"]
-alloc = ["curve25519-dalek/alloc", "ed25519/alloc", "serde?/alloc", "zeroize?/alloc"]
-std = ["alloc", "ed25519/std", "serde?/std", "sha2/std"]
+alloc = ["curve25519-dalek/alloc", "ed25519/alloc", "signature/alloc", "serde?/alloc", "zeroize?/alloc"]
+std = ["alloc", "ed25519/std", "serde?/std"]
 
-asm = ["sha2/asm"]
 batch = ["alloc", "dep:keccak", "rand_core"]
 fast = ["curve25519-dalek/precomputed-tables"]
 digest = ["signature/digest"]
diff --git a/ed25519-dalek/src/errors.rs b/ed25519-dalek/src/errors.rs
index 7cba06d..720bfee 100644
--- a/ed25519-dalek/src/errors.rs
+++ b/ed25519-dalek/src/errors.rs
@@ -13,12 +13,10 @@
 // Display) should be snake cased, for some reason.
 #![allow(non_snake_case)]
 
+use core::error::Error;
 use core::fmt;
 use core::fmt::Display;
 
-#[cfg(feature = "std")]
-use std::error::Error;
-
 /// Internal errors.  Most application-level developers will likely not
 /// need to pay any attention to these.
 #[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
@@ -87,7 +85,6 @@ impl Display for InternalError {
     }
 }
 
-#[cfg(feature = "std")]
 impl Error for InternalError {}
 
 /// Errors which may occur while processing signatures and keypairs.
@@ -107,12 +104,12 @@ impl Error for InternalError {}
 pub type SignatureError = ed25519::signature::Error;
 
 impl From<InternalError> for SignatureError {
-    #[cfg(not(feature = "std"))]
+    #[cfg(not(feature = "alloc"))]
     fn from(_err: InternalError) -> SignatureError {
         SignatureError::new()
     }
 
-    #[cfg(feature = "std")]
+    #[cfg(feature = "alloc")]
     fn from(err: InternalError) -> SignatureError {
         SignatureError::from_source(err)
     }
diff --git a/ed25519-dalek/src/hazmat.rs b/ed25519-dalek/src/hazmat.rs
index fa2d53c..fd463b5 100644
--- a/ed25519-dalek/src/hazmat.rs
+++ b/ed25519-dalek/src/hazmat.rs
@@ -25,7 +25,7 @@ use zeroize::{Zeroize, ZeroizeOnDrop};
 
 // These are used in the functions that are made public when the hazmat feature is set
 use crate::{Signature, VerifyingKey};
-use curve25519_dalek::digest::{Digest, generic_array::typenum::U64};
+use curve25519_dalek::digest::{Digest, array::typenum::U64};
 
 /// Contains the secret scalar and domain separator used for generating signatures.
 ///
diff --git a/ed25519-dalek/src/signing.rs b/ed25519-dalek/src/signing.rs
index 98366d8..4372148 100644
--- a/ed25519-dalek/src/signing.rs
+++ b/ed25519-dalek/src/signing.rs
@@ -24,7 +24,7 @@ use sha2::Sha512;
 use subtle::{Choice, ConstantTimeEq};
 
 use curve25519_dalek::{
-    digest::{Digest, generic_array::typenum::U64},
+    digest::{Digest, array::typenum::U64},
     edwards::{CompressedEdwardsY, EdwardsPoint},
     scalar::Scalar,
 };
@@ -734,10 +734,10 @@ impl From<&SigningKey> for pkcs8::KeypairBytes {
 }
 
 #[cfg(feature = "pkcs8")]
-impl TryFrom<pkcs8::PrivateKeyInfo<'_>> for SigningKey {
+impl TryFrom<pkcs8::PrivateKeyInfoRef<'_>> for SigningKey {
     type Error = pkcs8::Error;
 
-    fn try_from(private_key: pkcs8::PrivateKeyInfo<'_>) -> pkcs8::Result<Self> {
+    fn try_from(private_key: pkcs8::PrivateKeyInfoRef<'_>) -> pkcs8::Result<Self> {
         pkcs8::KeypairBytes::try_from(private_key)?.try_into()
     }
 }
diff --git a/ed25519-dalek/src/verifying.rs b/ed25519-dalek/src/verifying.rs
index fff711c..a090dc0 100644
--- a/ed25519-dalek/src/verifying.rs
+++ b/ed25519-dalek/src/verifying.rs
@@ -13,7 +13,7 @@ use core::fmt::Debug;
 use core::hash::{Hash, Hasher};
 
 use curve25519_dalek::{
-    digest::{Digest, generic_array::typenum::U64},
+    digest::{Digest, array::typenum::U64},
     edwards::{CompressedEdwardsY, EdwardsPoint},
     montgomery::MontgomeryPoint,
     scalar::Scalar,