diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 2256978..9a90f44 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -12,7 +12,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Install
-      run: rustup default nightly
+      run: rustup default stable
     - name: Install rustfmt Components
       run: rustup component add rustfmt
     - name: Install clippy
diff --git a/Cargo.toml b/Cargo.toml
index eef36b0..53d86f7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,7 +12,7 @@ keywords = ["zkSNARKs", "cryptography", "proofs"]
 
 [dependencies]
 bellperson = { version = "0.20", default-features = false }
-ff = { version = "0.11.0", features = ["derive"] }
+ff = "0.11.0"
 merlin = "2.0.0"
 rand = "0.8.4"
 digest = "0.8.1"
diff --git a/rustfmt.toml b/rustfmt.toml
index 351c26a..d05b46e 100644
--- a/rustfmt.toml
+++ b/rustfmt.toml
@@ -1,5 +1,4 @@
 edition = "2018"
 tab_spaces = 2
 newline_style = "Unix"
-use_try_shorthand = true
-imports_granularity = "crate"
+use_try_shorthand = true
\ No newline at end of file
diff --git a/src/gadgets/ecc.rs b/src/gadgets/ecc.rs
index 1e82f93..9f2a488 100644
--- a/src/gadgets/ecc.rs
+++ b/src/gadgets/ecc.rs
@@ -559,37 +559,14 @@ where
   }
 }
 
-#[cfg(test)]
-#[allow(clippy::too_many_arguments)]
-mod fp {
-  use ff::PrimeField;
-
-  #[derive(PrimeField)]
-  #[PrimeFieldModulus = "28948022309329048855892746252171976963363056481941560715954676764349967630337"]
-  #[PrimeFieldGenerator = "5"]
-  #[PrimeFieldReprEndianness = "little"]
-  pub struct Fp([u64; 4]);
-}
-
-#[cfg(test)]
-#[allow(clippy::too_many_arguments)]
-mod fq {
-  use ff::PrimeField;
-
-  #[derive(PrimeField)]
-  #[PrimeFieldModulus = "28948022309329048855892746252171976963363056481941647379679742748393362948097"]
-  #[PrimeFieldGenerator = "5"]
-  #[PrimeFieldReprEndianness = "little"]
-  pub struct Fq([u64; 4]);
-}
-
 #[cfg(test)]
 mod tests {
   use super::*;
 
   #[test]
   fn test_ecc_ops() {
-    use super::{fp::Fp, fq::Fq};
+    type Fp = pasta_curves::pallas::Base;
+    type Fq = pasta_curves::pallas::Scalar;
 
     // perform some curve arithmetic
     let a = Point::<Fp, Fq>::random_vartime();
@@ -601,35 +578,35 @@ mod tests {
 
     // perform the same computation by translating to pasta_curve types
     let a_pasta = EpAffine::from_xy(
-      pasta_curves::Fp::from_repr(a.x.to_repr().0).unwrap(),
-      pasta_curves::Fp::from_repr(a.y.to_repr().0).unwrap(),
+      pasta_curves::Fp::from_repr(a.x.to_repr()).unwrap(),
+      pasta_curves::Fp::from_repr(a.y.to_repr()).unwrap(),
     )
     .unwrap();
     let b_pasta = EpAffine::from_xy(
-      pasta_curves::Fp::from_repr(b.x.to_repr().0).unwrap(),
-      pasta_curves::Fp::from_repr(b.y.to_repr().0).unwrap(),
+      pasta_curves::Fp::from_repr(b.x.to_repr()).unwrap(),
+      pasta_curves::Fp::from_repr(b.y.to_repr()).unwrap(),
     )
     .unwrap();
     let c_pasta = (a_pasta + b_pasta).to_affine();
     let d_pasta = (a_pasta + a_pasta).to_affine();
     let e_pasta = a_pasta
-      .mul(pasta_curves::Fq::from_repr(s.to_repr().0).unwrap())
+      .mul(pasta_curves::Fq::from_repr(s.to_repr()).unwrap())
       .to_affine();
 
     // transform c, d, and e into pasta_curve types
     let c_pasta_2 = EpAffine::from_xy(
-      pasta_curves::Fp::from_repr(c.x.to_repr().0).unwrap(),
-      pasta_curves::Fp::from_repr(c.y.to_repr().0).unwrap(),
+      pasta_curves::Fp::from_repr(c.x.to_repr()).unwrap(),
+      pasta_curves::Fp::from_repr(c.y.to_repr()).unwrap(),
     )
     .unwrap();
     let d_pasta_2 = EpAffine::from_xy(
-      pasta_curves::Fp::from_repr(d.x.to_repr().0).unwrap(),
-      pasta_curves::Fp::from_repr(d.y.to_repr().0).unwrap(),
+      pasta_curves::Fp::from_repr(d.x.to_repr()).unwrap(),
+      pasta_curves::Fp::from_repr(d.y.to_repr()).unwrap(),
     )
     .unwrap();
     let e_pasta_2 = EpAffine::from_xy(
-      pasta_curves::Fp::from_repr(e.x.to_repr().0).unwrap(),
-      pasta_curves::Fp::from_repr(e.y.to_repr().0).unwrap(),
+      pasta_curves::Fp::from_repr(e.x.to_repr()).unwrap(),
+      pasta_curves::Fp::from_repr(e.y.to_repr()).unwrap(),
     )
     .unwrap();