diff --git a/risc0/ped_bls12_381_test/methods/guest/src/main.rs b/risc0/ped_bls12_381_test/methods/guest/src/main.rs
index 42fea58..5fdf768 100644
--- a/risc0/ped_bls12_381_test/methods/guest/src/main.rs
+++ b/risc0/ped_bls12_381_test/methods/guest/src/main.rs
@@ -8,7 +8,7 @@ fn main() {
 
     // TODO: do something with the input
     let g1 = bls12_381::G1Affine::generator();
-    let g1_proj = bls12_381::G1Projective::from(g1); 
+    let g1_proj = bls12_381::G1Projective::from(g1);
     let g2 = g1_proj + g1;
     let g3 = g1 + g2;
     let g4 = g1 + g3;
diff --git a/risc0/ped_curve25519_test/methods/guest/Cargo.toml b/risc0/ped_curve25519_test/methods/guest/Cargo.toml
index 05af76c..831fb17 100644
--- a/risc0/ped_curve25519_test/methods/guest/Cargo.toml
+++ b/risc0/ped_curve25519_test/methods/guest/Cargo.toml
@@ -7,4 +7,5 @@ edition = "2021"
 
 [dependencies]
 risc0-zkvm = { version = "^2.1.0", default-features = false, features = ['std'] }
-curve25519-dalek = "4"
+curve25519-dalek = "4.1.2"
+
diff --git a/risc0/ped_secp256k1_test/methods/guest/Cargo.toml b/risc0/ped_secp256k1_test/methods/guest/Cargo.toml
index d066c3c..a1039c7 100644
--- a/risc0/ped_secp256k1_test/methods/guest/Cargo.toml
+++ b/risc0/ped_secp256k1_test/methods/guest/Cargo.toml
@@ -6,5 +6,8 @@ edition = "2021"
 [workspace]
 
 [dependencies]
-risc0-zkvm = { version = "^2.1.0", default-features = false, features = ['std'] }
-k256 = "0.13.4"
+risc0-zkvm = { version = "^2.1.0", default-features = false, features = ['std', 'unstable'] }
+k256 = "0.13.3"
+
+[patch.crates-io]
+k256 = { git = "https://github.com/risc0/RustCrypto-elliptic-curves", tag = "k256/v0.13.3-risczero.1" }