diff --git a/Cargo.lock b/Cargo.lock
index c5cdc94..5e64e76 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -499,13 +499,14 @@ dependencies = [
 
 [[package]]
 name = "curve25519-dalek"
-version = "4.0.0-pre.1"
+version = "4.0.0-rc.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4033478fbf70d6acf2655ac70da91ee65852d69daf7a67bf7a2f518fb47aafcf"
+checksum = "03d928d978dbec61a1167414f5ec534f24bea0d7a0d24dd9b6233d3d8223e585"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.6.4",
+ "cfg-if",
+ "fiat-crypto",
+ "packed_simd_2",
+ "platforms",
  "subtle",
  "zeroize",
 ]
@@ -581,6 +582,12 @@ name = "espresso-systems-common"
 version = "0.2.0"
 source = "git+https://github.com/espressosystems/espresso-systems-common?branch=main#6c89e70c9b2ae0c2ed1690e843fdaaf0baaf732b"
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "futures-channel"
 version = "0.3.25"
@@ -850,6 +857,12 @@ version = "0.2.137"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fc7fcc620a3bff7cdd7a365be3376c97191aeaccc2a603e600951e452615bf89"
 
+[[package]]
+name = "libm"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7fc7aa29613bd6a620df431842069224d8bc9011086b1db4c0e0cd47fa03ec9a"
+
 [[package]]
 name = "log"
 version = "0.4.17"
@@ -932,6 +945,16 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
 
+[[package]]
+name = "packed_simd_2"
+version = "0.3.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1914cd452d8fccd6f9db48147b29fd4ae05bea9dc5d9ad578509f72415de282"
+dependencies = [
+ "cfg-if",
+ "libm",
+]
+
 [[package]]
 name = "paste"
 version = "1.0.9"
@@ -975,6 +998,12 @@ dependencies = [
  "ucd-trie",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "poly1305"
 version = "0.7.2"
@@ -1404,7 +1433,7 @@ dependencies = [
  "ark-serialize",
  "ark-std",
  "chacha20poly1305 0.9.1",
- "curve25519-dalek 4.0.0-pre.1",
+ "curve25519-dalek 4.0.0-rc.2",
  "displaydoc",
  "hkdf",
  "jf-plonk",
diff --git a/Cargo.toml b/Cargo.toml
index 9559aea..26578fe 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,7 +16,7 @@ ark-ff = { version = "0.3.0", default-features = false }
 ark-serialize = { version = "0.3.0", default-features = false }
 ark-std = { version = "0.3.0", default-features = false }
 chacha20poly1305 = "0.9.0"
-curve25519-dalek = "4.0.0-pre.1"
+curve25519-dalek = "4.0.0-rc.2"
 displaydoc = { version = "0.2.3", default-features = false }
 hkdf = "0.12.0"
 jf-plonk = { git = "https://github.com/EspressoSystems/jellyfish.git", rev = "64f55becffe0b93bfef2c6dc49274ef54d5ff6fc"}