diff --git a/rust-arkworks/Cargo.toml b/rust-arkworks/Cargo.toml
index 80c96ba..a2c5293 100644
--- a/rust-arkworks/Cargo.toml
+++ b/rust-arkworks/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-ark-ec = "0.3.0"
+ark-ec = "~0.3.0"
 ark-ff = "0.3.0"
 ark-std = "0.3.0"
 ark-serialize = "0.3.0"
diff --git a/rust-arkworks/src/hash_to_curve.rs b/rust-arkworks/src/hash_to_curve.rs
index bbe8133..c3fac28 100644
--- a/rust-arkworks/src/hash_to_curve.rs
+++ b/rust-arkworks/src/hash_to_curve.rs
@@ -2,7 +2,7 @@ use crate::error::CryptoError;
 use ark_ec::{AffineCurve, ProjectiveCurve};
 use tiny_keccak::{Hasher, Shake, Xof};
 use elliptic_curve::hash2curve::{ExpandMsgXmd, GroupDigest};
-use k256::{AffinePoint};
+use k256::AffinePoint;
 use k256::sha2::Sha256;
 use elliptic_curve::sec1::ToEncodedPoint;
 use ark_ec::short_weierstrass_jacobian::GroupAffine;
@@ -31,18 +31,17 @@ pub fn hash_to_curve<
 
     let pt_affine = pt.to_affine();
 
-    k256_affine_to_arkworks_secp256k1_affine::<Fp, P>(pt_affine)
+    k256_affine_to_arkworks_secp256k1_affine::<P>(pt_affine)
 }
 
 pub fn k256_affine_to_arkworks_secp256k1_affine<
-    Fp: ark_ff::PrimeField,
     P: ark_ec::SWModelParameters
 >(
     k_pt: AffinePoint,
 ) -> GroupAffine<P> {
     let encoded_pt = k_pt.to_encoded_point(false);
 
-    let num_field_bytes = 320;
+    let num_field_bytes = 40;
 
     // extract k_pt.x
     let k_pt_x_bytes = encoded_pt.x().unwrap();
diff --git a/rust-arkworks/src/tests.rs b/rust-arkworks/src/tests.rs
index 759f7f6..2f0bcaa 100644
--- a/rust-arkworks/src/tests.rs
+++ b/rust-arkworks/src/tests.rs
@@ -40,7 +40,6 @@ pub fn test_k256_affine_to_arkworks_secp256k1_affine() {
 
         // Convert k256_pt to an arkworks point
         let converted_pt = k256_affine_to_arkworks_secp256k1_affine::<
-            secp256k1::fields::Fq,
             Secp256k1Parameters
         >(k256_pt.to_affine());