diff --git a/rln/src/circuit.rs b/rln/src/circuit.rs
index de7b29c..a893774 100644
--- a/rln/src/circuit.rs
+++ b/rln/src/circuit.rs
@@ -145,7 +145,7 @@ pub fn circom_from_folder(resources_folder: &str) -> Result<&'static Mutex<Witne
 
 // Utilities to convert a json verification key in a groth16::VerificationKey
 fn fq_from_str(s: &str) -> Result<Fq> {
-    Ok(Fq::try_from(BigUint::from_str(s)?)?)
+    Ok(Fq::from(BigUint::from_str(s)?))
 }
 
 // Extracts the element in G1 corresponding to its JSON serialization
diff --git a/rln/src/utils.rs b/rln/src/utils.rs
index d35c0b8..581d070 100644
--- a/rln/src/utils.rs
+++ b/rln/src/utils.rs
@@ -8,7 +8,7 @@ use num_traits::Num;
 use std::iter::Extend;
 
 pub fn to_bigint(el: &Fr) -> Result<BigInt> {
-    let res: BigUint = (*el).try_into()?;
+    let res: BigUint = (*el).into();
     Ok(res.into())
 }
 
@@ -28,10 +28,10 @@ pub fn str_to_fr(input: &str, radix: u32) -> Result<Fr> {
     input_clean = input_clean.trim().to_string();
 
     if radix == 10 {
-        Ok(BigUint::from_str_radix(&input_clean, radix)?.try_into()?)
+        Ok(BigUint::from_str_radix(&input_clean, radix)?.into())
     } else {
         input_clean = input_clean.replace("0x", "");
-        Ok(BigUint::from_str_radix(&input_clean, radix)?.try_into()?)
+        Ok(BigUint::from_str_radix(&input_clean, radix)?.into())
     }
 }