diff --git a/Cargo.lock b/Cargo.lock
index ab26e8f04d..a4697ba032 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -937,16 +937,27 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "134951f4028bdadb9b84baf4232681efbf277da25144b9b0ad65df75946c422b"
 
 [[package]]
-name = "ed25519-dalek"
-version = "1.0.0-pre.3"
+name = "ed25519"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "978710b352437433c97b2bff193f2fb1dfd58a093f863dd95e225a19baa599a2"
+checksum = "bf038a7b6fd7ef78ad3348b63f3a17550877b0e28f8d68bcc94894d1412158bc"
+dependencies = [
+ "serde",
+ "signature",
+]
+
+[[package]]
+name = "ed25519-dalek"
+version = "1.0.0-pre.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "21a8a37f4e8b35af971e6db5e3897e7a6344caa3f92f6544f88125a1f5f0035a"
 dependencies = [
- "clear_on_drop",
  "curve25519-dalek 2.1.0",
+ "ed25519",
  "rand 0.7.3",
  "serde",
  "sha2",
+ "zeroize",
 ]
 
 [[package]]
@@ -3612,6 +3623,12 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "signature"
+version = "1.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29f060a7d147e33490ec10da418795238fd7545bba241504d6b31a409f2e6210"
+
 [[package]]
 name = "siphasher"
 version = "0.2.3"
diff --git a/core/Cargo.toml b/core/Cargo.toml
index 66af7c7c5a..b297c4e1a6 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -21,7 +21,7 @@ byteorder = "1.3.4"
 chrono = { version = "0.4.11", features = ["serde"] }
 core_affinity = "0.5.10"
 crossbeam-channel = "0.4"
-ed25519-dalek = "=1.0.0-pre.3"
+ed25519-dalek = "=1.0.0-pre.4"
 fs_extra = "1.1.0"
 flate2 = "1.0"
 indexmap = "1.3"
diff --git a/crate-features/Cargo.toml b/crate-features/Cargo.toml
index 8a63a8277f..0eff123fef 100644
--- a/crate-features/Cargo.toml
+++ b/crate-features/Cargo.toml
@@ -21,7 +21,7 @@ rand_chacha = { version = "0.2.2" }
 regex-syntax = { version = "0.6.12" }
 reqwest = { version = "0.10.1", default-features = false, features = ["blocking", "rustls-tls", "json"] }
 serde = { version = "1.0.100", features = ["rc"] }
-ed25519-dalek = { version = "=1.0.0-pre.3", features = ["serde"] }
+ed25519-dalek = { version = "=1.0.0-pre.4", features = ["serde"] }
 syn_0_15 = { package = "syn", version = "0.15.42", features = ["extra-traits", "fold", "full"] }
 syn_1_0 = { package = "syn", version = "1.0.3", features = ["extra-traits", "fold", "full"] }
 tokio = { version = "0.1.22",features=["bytes", "codec", "default", "fs", "io", "mio", "num_cpus", "reactor", "rt-full", "sync", "tcp", "timer", "tokio-codec", "tokio-current-thread", "tokio-executor", "tokio-io", "tokio-io", "tokio-reactor", "tokio-tcp", "tokio-tcp", "tokio-threadpool", "tokio-timer", "tokio-udp", "tokio-uds", "udp", "uds"] }
diff --git a/programs/bpf/Cargo.lock b/programs/bpf/Cargo.lock
index d9732556fb..f8a768c9e1 100644
--- a/programs/bpf/Cargo.lock
+++ b/programs/bpf/Cargo.lock
@@ -180,14 +180,6 @@ dependencies = [
  "time 0.1.43 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "clear_on_drop"
-version = "0.2.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cc 1.0.49 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "cloudabi"
 version = "0.0.3"
@@ -284,15 +276,25 @@ version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "ed25519-dalek"
-version = "1.0.0-pre.3"
+name = "ed25519"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "serde 1.0.112 (registry+https://github.com/rust-lang/crates.io-index)",
+ "signature 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "ed25519-dalek"
+version = "1.0.0-pre.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "clear_on_drop 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "curve25519-dalek 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ed25519 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.114 (registry+https://github.com/rust-lang/crates.io-index)",
  "sha2 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "zeroize 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1366,6 +1368,11 @@ dependencies = [
  "opaque-debug 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "signature"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "slab"
 version = "0.4.2"
@@ -1569,7 +1576,7 @@ dependencies = [
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "cc 1.0.49 (registry+https://github.com/rust-lang/crates.io-index)",
  "curve25519-dalek 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "ed25519-dalek 1.0.0-pre.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ed25519-dalek 1.0.0-pre.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1668,7 +1675,7 @@ dependencies = [
  "bv 0.11.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "chrono 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "ed25519-dalek 1.0.0-pre.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ed25519-dalek 1.0.0-pre.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "generic-array 0.14.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "hmac 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2309,6 +2316,20 @@ dependencies = [
 name = "zeroize"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "zeroize_derive 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "zeroize_derive"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
+ "synstructure 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [metadata]
 "checksum addr2line 0.12.2 (registry+https://github.com/rust-lang/crates.io-index)" = "602d785912f476e480434627e8732e6766b760c045bbf897d9dfaa9f4fbd399c"
@@ -2336,7 +2357,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum cc 1.0.49 (registry+https://github.com/rust-lang/crates.io-index)" = "e450b8da92aa6f274e7c6437692f9f2ce6d701fb73bacfcf87897b3f89a4c20e"
 "checksum cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)" = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
 "checksum chrono 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)" = "80094f509cf8b5ae86a4966a39b3ff66cd7e2a3e594accec3743ff3fabeab5b2"
-"checksum clear_on_drop 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "c9cc5db465b294c3fa986d5bbb0f3017cd850bff6dd6c52f9ccff8b4d21b7b08"
 "checksum cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ddfc5b9aa5d4507acaf872de71051dfd0e309860e88966e1051e462a077aac4f"
 "checksum combine 2.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1645a65a99c7c8d345761f4b75a6ffe5be3b3b27a93ee731fccc5050ba6be97c"
 "checksum crossbeam-deque 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)" = "9f02af974daeee82218205558e51ec8768b48cf524bd01d550abe5573a608285"
@@ -2347,7 +2367,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum curve25519-dalek 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5d85653f070353a16313d0046f173f70d1aadd5b42600a14de626f0dfb3473a5"
 "checksum digest 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "f3d0c8c8752312f9713efd397ff63acb9f85585afbf179282e720e7704954dd5"
 "checksum dtoa 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "134951f4028bdadb9b84baf4232681efbf277da25144b9b0ad65df75946c422b"
-"checksum ed25519-dalek 1.0.0-pre.3 (registry+https://github.com/rust-lang/crates.io-index)" = "978710b352437433c97b2bff193f2fb1dfd58a093f863dd95e225a19baa599a2"
+"checksum ed25519-dalek 1.0.0-pre.4 (registry+https://github.com/rust-lang/crates.io-index)" = "21a8a37f4e8b35af971e6db5e3897e7a6344caa3f92f6544f88125a1f5f0035a"
 "checksum either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "bb1f6b1ce1c140482ea30ddd3335fc0024ac7ee112895426e0a629a6c20adfe3"
 "checksum elf 0.0.10 (registry+https://github.com/rust-lang/crates.io-index)" = "4841de15dbe0e49b9b62a417589299e3be0d557e0900d36acb87e6dae47197f5"
 "checksum encoding_rs 0.8.23 (registry+https://github.com/rust-lang/crates.io-index)" = "e8ac63f94732332f44fe654443c46f6375d1939684c17b0afb6cb56b0456e171"
@@ -2473,6 +2493,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum serde_json 1.0.55 (registry+https://github.com/rust-lang/crates.io-index)" = "ec2c5d7e739bc07a3e73381a39d61fdb5f671c60c1df26a130690665803d8226"
 "checksum serde_urlencoded 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9ec5d77e2d4c73717816afac02670d5c4f534ea95ed430442cad02e7a6e32c97"
 "checksum sha2 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)" = "a256f46ea78a0c0d9ff00077504903ac881a1dafdc20da66545699e7776b3e69"
+"checksum signature 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "65211b7b6fc3f14ff9fc7a2011a434e3e6880585bd2e9e9396315ae24cbf7852"
 "checksum slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c111b5bd5695e56cffe5129854aa230b39c93a305372fdbb2668ca2394eea9f8"
 "checksum smallvec 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)" = "f7b0758c52e15a8b5e3691eae6cc559f08eee9406e548a4477ba4e67770a82b6"
 "checksum socket2 0.3.12 (registry+https://github.com/rust-lang/crates.io-index)" = "03088793f677dce356f3ccc2edb1b314ad191ab702a5de3faf49304f7e104918"
diff --git a/sdk/Cargo.toml b/sdk/Cargo.toml
index 0f76ba2bc3..e9371e86c7 100644
--- a/sdk/Cargo.toml
+++ b/sdk/Cargo.toml
@@ -52,7 +52,7 @@ serde_derive = "1.0.103"
 serde_json = { version = "1.0.53", optional = true }
 sha2 = "0.8.2"
 thiserror = "1.0"
-ed25519-dalek = { version = "=1.0.0-pre.3", optional = true }
+ed25519-dalek = { version = "=1.0.0-pre.4", optional = true }
 solana-crate-features = { path = "../crate-features", version = "1.2.17", optional = true }
 solana-logger = { path = "../logger", version = "1.2.17", optional = true }
 solana-sdk-macro = { path = "macro", version = "1.2.17" }
diff --git a/sdk/src/signature.rs b/sdk/src/signature.rs
index ed1860f465..5fd4e1ee5d 100644
--- a/sdk/src/signature.rs
+++ b/sdk/src/signature.rs
@@ -1,12 +1,14 @@
 //! The `signature` module provides functionality for public, and private keys.
 
 use crate::{pubkey::Pubkey, transaction::TransactionError};
+use ed25519_dalek::Signer as DalekSigner;
 use generic_array::{typenum::U64, GenericArray};
 use hmac::Hmac;
 use itertools::Itertools;
 use rand::{rngs::OsRng, CryptoRng, RngCore};
 use std::{
     borrow::{Borrow, Cow},
+    convert::TryInto,
     error, fmt,
     fs::{self, File, OpenOptions},
     io::{Read, Write},
@@ -16,7 +18,7 @@ use std::{
 };
 use thiserror::Error;
 
-#[derive(Debug, Default)]
+#[derive(Debug)]
 pub struct Keypair(ed25519_dalek::Keypair);
 
 impl Keypair {
@@ -63,7 +65,7 @@ impl Signature {
         message_bytes: &[u8],
     ) -> Result<(), ed25519_dalek::SignatureError> {
         let publickey = ed25519_dalek::PublicKey::from_bytes(pubkey_bytes)?;
-        let signature = ed25519_dalek::Signature::from_bytes(self.0.as_slice())?;
+        let signature = self.0.as_slice().try_into()?;
         publickey.verify_strict(message_bytes, &signature)
     }