diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 806ce990d8..daf8911052 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -73,7 +73,7 @@ jobs:
       RUST_TOOLCHAIN_COVERAGE_VERSION: "1.74"
     strategy:
       matrix:
-        rust_toolchain_version: ["1.72", "1.73", "1.74", "1.75", "1.76", "1.77", "1.78"]
+        rust_toolchain_version: ["1.72", "1.73", "1.74", "1.75", "1.76", "1.77", "1.78", "1.79"]
         # FIXME: currently not available for 5.0.0.
         # It might be related to boxroot dependency, and we would need to bump
         # up the ocaml-rs dependency
diff --git a/ivc/src/ivc/interpreter.rs b/ivc/src/ivc/interpreter.rs
index a1d7784d20..befb0b804e 100644
--- a/ivc/src/ivc/interpreter.rs
+++ b/ivc/src/ivc/interpreter.rs
@@ -818,15 +818,11 @@ pub fn build_fixed_selectors<const N_COL_TOTAL: usize, const N_CHALS: usize>(
     }
 
     for i in N_BLOCKS..N_FSEL_IVC - N_BLOCKS {
-        PoseidonBN254Parameters
-            .constants()
-            .iter()
-            .enumerate()
-            .for_each(|(_round, rcs)| {
-                rcs.iter().enumerate().for_each(|(_state_index, rc)| {
-                    selectors[i] = vec![*rc; domain_size];
-                });
+        PoseidonBN254Parameters.constants().iter().for_each(|rcs| {
+            rcs.iter().for_each(|rc| {
+                selectors[i] = vec![*rc; domain_size];
             });
+        });
     }
 
     selectors
diff --git a/kimchi/src/circuits/polynomials/foreign_field_add/witness.rs b/kimchi/src/circuits/polynomials/foreign_field_add/witness.rs
index c54236197b..99c4a1b33c 100644
--- a/kimchi/src/circuits/polynomials/foreign_field_add/witness.rs
+++ b/kimchi/src/circuits/polynomials/foreign_field_add/witness.rs
@@ -147,7 +147,7 @@ pub fn create_chain<F: PrimeField>(
     // Make sure that the inputs are smaller than the modulus just in case
     let inputs: Vec<BigUint> = inputs.iter().map(|input| input % modulus.clone()).collect();
 
-    let mut witness = array::from_fn(|_| vec![F::zero(); 0]);
+    let mut witness: [Vec<F>; COLUMNS] = array::from_fn(|_| vec![]);
 
     let foreign_modulus = ForeignElement::from_biguint(modulus);
 
diff --git a/kimchi/src/circuits/polynomials/foreign_field_mul/witness.rs b/kimchi/src/circuits/polynomials/foreign_field_mul/witness.rs
index 16cb810d05..7b14e6938e 100644
--- a/kimchi/src/circuits/polynomials/foreign_field_mul/witness.rs
+++ b/kimchi/src/circuits/polynomials/foreign_field_mul/witness.rs
@@ -152,7 +152,7 @@ pub fn create<F: PrimeField>(
     right_input: &BigUint,
     foreign_field_modulus: &BigUint,
 ) -> ([Vec<F>; COLUMNS], ExternalChecks<F>) {
-    let mut witness = array::from_fn(|_| vec![F::zero(); 0]);
+    let mut witness: [Vec<F>; COLUMNS] = array::from_fn(|_| vec![]);
     let mut external_checks = ExternalChecks::<F>::default();
 
     // Compute quotient and remainder using foreign field modulus
diff --git a/kimchi/src/prover.rs b/kimchi/src/prover.rs
index b135d20836..711e2cacbf 100644
--- a/kimchi/src/prover.rs
+++ b/kimchi/src/prover.rs
@@ -701,8 +701,7 @@ where
                 index_evals.extend(
                     foreign_field_mul::gadget::circuit_gates()
                         .iter()
-                        .enumerate()
-                        .map(|(_, gate_type)| (*gate_type, selector)),
+                        .map(|gate_type| (*gate_type, selector)),
                 );
             }
 
diff --git a/kimchi/src/tests/keccak.rs b/kimchi/src/tests/keccak.rs
index cb0f0e5387..80565f59d7 100644
--- a/kimchi/src/tests/keccak.rs
+++ b/kimchi/src/tests/keccak.rs
@@ -36,8 +36,7 @@ fn create_keccak_witness<G: KimchiCurve>(message: BigUint) -> [Vec<G::ScalarFiel
 where
     G::BaseField: PrimeField,
 {
-    let mut witness: [Vec<G::ScalarField>; KECCAK_COLS] =
-        array::from_fn(|_| vec![G::ScalarField::zero(); 0]);
+    let mut witness: [Vec<G::ScalarField>; KECCAK_COLS] = array::from_fn(|_| vec![]);
     extend_keccak_witness(&mut witness, message);
     // Adding dummy row to avoid out of bounds in squeeze constraints accessing Next row
     let dummy_row: [Vec<G::ScalarField>; KECCAK_COLS] =
diff --git a/o1vm/src/utils.rs b/o1vm/src/utils.rs
index 64b70ded78..9dfe7496a5 100644
--- a/o1vm/src/utils.rs
+++ b/o1vm/src/utils.rs
@@ -45,6 +45,6 @@ mod tests {
         assert_eq!(memory_size(1024_usize), "1.0 KiB");
         assert_eq!(memory_size(1024 * 1024_usize), "1.0 MiB");
         assert_eq!(memory_size(2100 * 1024 * 1024_usize), "2.1 GiB");
-        assert_eq!(memory_size(std::usize::MAX), "16.0 EiB");
+        assert_eq!(memory_size(usize::MAX), "16.0 EiB");
     }
 }