diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index e4205e80..5d7f8702 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,6 +1,6 @@
 [toolchain]
 # The default profile includes rustc, rust-std, cargo, rust-docs, rustfmt and clippy.
 profile = "default"
-channel = "1.78"
+channel = "1.79"
 targets = [ "wasm32-unknown-unknown" ]
 
diff --git a/src/gadgets/nonnative/util.rs b/src/gadgets/nonnative/util.rs
index c63108f0..e29288ff 100644
--- a/src/gadgets/nonnative/util.rs
+++ b/src/gadgets/nonnative/util.rs
@@ -14,6 +14,7 @@ use std::io::{self, Write};
 pub struct Bit<Scalar: PrimeField> {
   /// The linear combination which constrain the value of the bit
   pub bit: LinearCombination<Scalar>,
+  #[allow(unused)]
   /// The value of the bit (filled at witness-time)
   pub value: Option<bool>,
 }
diff --git a/src/gadgets/utils.rs b/src/gadgets/utils.rs
index fcae1350..84cdbf44 100644
--- a/src/gadgets/utils.rs
+++ b/src/gadgets/utils.rs
@@ -74,8 +74,7 @@ pub fn alloc_scalar_as_base<E, CS>(
   input: Option<E::Scalar>,
 ) -> Result<AllocatedNum<E::Base>, SynthesisError>
 where
-  E: Engine,
-  <E as Engine>::Scalar: PrimeFieldBits,
+  E: Engine<Scalar: PrimeFieldBits>,
   CS: ConstraintSystem<<E as Engine>::Base>,
 {
   AllocatedNum::alloc(cs.namespace(|| "allocate scalar as base"), || {