diff --git a/offchain/authority-claimer/src/claimer.rs b/offchain/authority-claimer/src/claimer.rs
index ba0f084d..1c4ea83c 100644
--- a/offchain/authority-claimer/src/claimer.rs
+++ b/offchain/authority-claimer/src/claimer.rs
@@ -36,10 +36,10 @@ pub enum AuthorityClaimerError<S: ClaimSender, L: BrokerListener> {
 
 #[derive(Default)]
 pub struct DefaultAuthorityClaimer<'a> {
-    lifetime: PhantomData<&'a ()>,
+    _lifetime: PhantomData<&'a ()>,
 }
 
-impl<'a> DefaultAuthorityClaimer<'a> {
+impl DefaultAuthorityClaimer<'_> {
     pub fn new() -> Self {
         Self::default()
     }
diff --git a/offchain/authority-claimer/src/listener.rs b/offchain/authority-claimer/src/listener.rs
index 6bfa5152..7ab23afa 100644
--- a/offchain/authority-claimer/src/listener.rs
+++ b/offchain/authority-claimer/src/listener.rs
@@ -14,11 +14,11 @@ pub trait BrokerListener: Sized + Send + Debug {
 }
 
 // ------------------------------------------------------------------------------------------------
-// RedisBrokerListener
+// DefaultBrokerListener
 // ------------------------------------------------------------------------------------------------
 
 #[derive(Debug)]
-pub struct DefaultBrokerListener {}
+pub struct DefaultBrokerListener;
 
 #[derive(Debug, Snafu)]
 pub enum DefaultBrokerListenerError {
diff --git a/offchain/authority-claimer/src/sender.rs b/offchain/authority-claimer/src/sender.rs
index 33080c16..bf9b09f6 100644
--- a/offchain/authority-claimer/src/sender.rs
+++ b/offchain/authority-claimer/src/sender.rs
@@ -25,7 +25,7 @@ pub trait ClaimSender: Sized + Send + Debug {
 // ------------------------------------------------------------------------------------------------
 
 #[derive(Debug, Clone)]
-pub struct TxManagerClaimSender {}
+pub struct TxManagerClaimSender;
 
 #[derive(Debug, Snafu)]
 pub enum TxManagerClaimSenderError {