diff --git a/zebra-chain/src/block.rs b/zebra-chain/src/block.rs
index 8b1e17ba35f..cee913dd5a4 100644
--- a/zebra-chain/src/block.rs
+++ b/zebra-chain/src/block.rs
@@ -78,8 +78,8 @@ impl Block {
     /// Verified blocks have a valid height.
     pub fn coinbase_height(&self) -> Option<Height> {
         self.transactions
-            .get(0)
-            .and_then(|tx| tx.inputs().get(0))
+            .first()
+            .and_then(|tx| tx.inputs().first())
             .and_then(|input| match input {
                 transparent::Input::Coinbase { ref height, .. } => Some(*height),
                 _ => None,
diff --git a/zebra-chain/src/transaction.rs b/zebra-chain/src/transaction.rs
index 583ca9681e8..3f099c2da77 100644
--- a/zebra-chain/src/transaction.rs
+++ b/zebra-chain/src/transaction.rs
@@ -511,7 +511,7 @@ impl Transaction {
     pub fn is_coinbase(&self) -> bool {
         self.inputs().len() == 1
             && matches!(
-                self.inputs().get(0),
+                self.inputs().first(),
                 Some(transparent::Input::Coinbase { .. })
             )
     }
diff --git a/zebra-network/src/peer.rs b/zebra-network/src/peer.rs
index 13498e9ba2f..b51db0adcf9 100644
--- a/zebra-network/src/peer.rs
+++ b/zebra-network/src/peer.rs
@@ -10,6 +10,7 @@ mod minimum_peer_version;
 mod priority;
 
 #[cfg(any(test, feature = "proptest-impl"))]
+#[allow(unused_imports)]
 pub use client::tests::ClientTestHarness;
 
 #[cfg(test)]
@@ -28,6 +29,7 @@ pub use error::{ErrorSlot, HandshakeError, PeerError, SharedPeerError};
 pub use handshake::{ConnectedAddr, ConnectionInfo, Handshake, HandshakeRequest};
 pub use load_tracked_client::LoadTrackedClient;
 pub use minimum_peer_version::MinimumPeerVersion;
+#[allow(unused_imports)]
 pub use priority::{
     address_is_valid_for_inbound_listeners, address_is_valid_for_outbound_connections,
     AttributePreference, PeerPreference,