diff --git a/bin/host/src/kv/mem.rs b/bin/host/src/kv/mem.rs
index 7a1f45548..7b26052e4 100644
--- a/bin/host/src/kv/mem.rs
+++ b/bin/host/src/kv/mem.rs
@@ -16,7 +16,7 @@ pub struct MemoryKeyValueStore {
 impl MemoryKeyValueStore {
     /// Create a new [MemoryKeyValueStore] with an empty store.
     pub fn new() -> Self {
-        Self { store: HashMap::new() }
+        Self { store: HashMap::default() }
     }
 }
 
diff --git a/crates/derive/src/stages/channel/channel_bank.rs b/crates/derive/src/stages/channel/channel_bank.rs
index ded3a6b9d..f50c8762d 100644
--- a/crates/derive/src/stages/channel/channel_bank.rs
+++ b/crates/derive/src/stages/channel/channel_bank.rs
@@ -53,7 +53,7 @@ where
     /// Create a new [ChannelBank] stage.
     pub fn new(cfg: Arc<RollupConfig>, prev: P) -> Self {
         crate::set!(STAGE_RESETS, 0, &["channel-bank"]);
-        Self { cfg, channels: HashMap::new(), channel_queue: VecDeque::new(), prev }
+        Self { cfg, channels: HashMap::default(), channel_queue: VecDeque::new(), prev }
     }
 
     /// Returns the size of the channel bank by accumulating over all channels.
diff --git a/crates/preimage/src/oracle.rs b/crates/preimage/src/oracle.rs
index 174dac6fb..6ea79a214 100644
--- a/crates/preimage/src/oracle.rs
+++ b/crates/preimage/src/oracle.rs
@@ -160,7 +160,7 @@ mod test {
             PreimageKey::new(*keccak256(MOCK_DATA_B), PreimageKeyType::Keccak256);
 
         let preimages = {
-            let mut preimages = HashMap::new();
+            let mut preimages = HashMap::default();
             preimages.insert(key_a, MOCK_DATA_A.to_vec());
             preimages.insert(key_b, MOCK_DATA_B.to_vec());
             Arc::new(Mutex::new(preimages))
@@ -212,7 +212,7 @@ mod test {
             PreimageKey::new(*keccak256(MOCK_DATA_B), PreimageKeyType::Keccak256);
 
         let preimages = {
-            let mut preimages = HashMap::new();
+            let mut preimages = HashMap::default();
             preimages.insert(key_a, MOCK_DATA_A.to_vec());
             preimages.insert(key_b, MOCK_DATA_B.to_vec());
             Arc::new(Mutex::new(preimages))