diff --git a/src/common.rs b/src/common.rs
index 6af1b95..ae1ab16 100644
--- a/src/common.rs
+++ b/src/common.rs
@@ -302,7 +302,7 @@ where
     //           I2OSP(len(seedDST), 2) || seedDST
     // seed = Hash(h1Input)
     let seed = CS::Hash::new()
-        .chain_update(&elem_len)
+        .chain_update(elem_len)
         .chain_update(CS::Group::serialize_elem(b))
         .chain_update(i2osp_2_array(&seed_dst))
         .chain_update(seed_dst)
diff --git a/src/oprf.rs b/src/oprf.rs
index 1fa73f0..6e8d7af 100644
--- a/src/oprf.rs
+++ b/src/oprf.rs
@@ -277,7 +277,7 @@ where
             .chain_update(input.as_ref())
             .chain_update(elem_len)
             .chain_update(CS::Group::serialize_elem(unblinded_element))
-            .chain_update(&STR_FINALIZE)
+            .chain_update(STR_FINALIZE)
             .finalize())
     })
 }
diff --git a/src/tests/mock_rng.rs b/src/tests/mock_rng.rs
index 3ccaee8..c055ea9 100644
--- a/src/tests/mock_rng.rs
+++ b/src/tests/mock_rng.rs
@@ -50,7 +50,7 @@ impl RngCore for CycleRng {
     #[inline]
     fn fill_bytes(&mut self, dest: &mut [u8]) {
         let len = min(self.v.len(), dest.len());
-        (&mut dest[..len]).copy_from_slice(&self.v[..len]);
+        dest[..len].copy_from_slice(&self.v[..len]);
         rotate_left(&mut self.v, len);
     }
 
diff --git a/src/tests/test_cfrg_vectors.rs b/src/tests/test_cfrg_vectors.rs
index 9fe23bf..80b6f35 100644
--- a/src/tests/test_cfrg_vectors.rs
+++ b/src/tests/test_cfrg_vectors.rs
@@ -60,15 +60,15 @@ fn populate_test_vectors(values: &JsonValue) -> VOPRFTestVectorParameters {
 fn decode(values: &JsonValue, key: &str) -> Vec<u8> {
     values[key]
         .as_str()
-        .and_then(|s| hex::decode(&s).ok())
+        .and_then(|s| hex::decode(s).ok())
         .unwrap_or_default()
 }
 
 fn decode_vec(values: &JsonValue, key: &str) -> Vec<Vec<u8>> {
     let s = values[key].as_str().unwrap();
     let res = match s.contains(',') {
-        true => Some(s.split(',').map(|x| hex::decode(&x).unwrap()).collect()),
-        false => Some(vec![hex::decode(&s).unwrap()]),
+        true => Some(s.split(',').map(|x| hex::decode(x).unwrap()).collect()),
+        false => Some(vec![hex::decode(s).unwrap()]),
     };
     res.unwrap()
 }