diff --git a/nimue/Cargo.toml b/nimue/Cargo.toml
index d479319..5d30ac9 100644
--- a/nimue/Cargo.toml
+++ b/nimue/Cargo.toml
@@ -10,7 +10,7 @@ license = "BSD-3-Clause"
 zeroize = { version = "1.6.0", features = ["zeroize_derive"] }
 rand = { version = "0.8", features = ["getrandom"] }
 digest = "^0.10.7"
-serde = "^1.0"
+serde = { version = "^1.0", features = ["derive"] }
 # used as default hasher for the prover
 keccak = { version = "0.1.4"}
 log = "0.4.20"
diff --git a/nimue/src/hash/legacy.rs b/nimue/src/hash/legacy.rs
index 9a47c24..9396f52 100644
--- a/nimue/src/hash/legacy.rs
+++ b/nimue/src/hash/legacy.rs
@@ -16,15 +16,15 @@
 //! `squeeze_unchecked` will use the squeeze oracle to output `output.len()` bytes,
 //! and finally `squeeze_end` will set the state `cv` to the current squeeze digest and length.
 //!
-use digest::{core_api::BlockSizeUser, typenum::Unsigned, Digest, FixedOutputReset, Reset};
 use digest::crypto_common::generic_array::GenericArray;
+use digest::{core_api::BlockSizeUser, typenum::Unsigned, Digest, FixedOutputReset, Reset};
 use zeroize::Zeroize;
 
 use super::DuplexHash;
 
 /// A Bridge to our sponge interface for legacy `Digest` implementations.
 #[derive(Clone)]
-pub struct DigestBridge<D: Digest + Clone + Reset + BlockSizeUser>  {
+pub struct DigestBridge<D: Digest + Clone + Reset + BlockSizeUser> {
     /// The underlying hasher.
     hasher: D,
     /// Cached digest