diff --git a/actix-rt/src/arbiter.rs b/actix-rt/src/arbiter.rs
index 80ba055b..0fd30db8 100644
--- a/actix-rt/src/arbiter.rs
+++ b/actix-rt/src/arbiter.rs
@@ -172,7 +172,7 @@ impl Arbiter {
         let system_id = sys.id();
         let arb_id = COUNT.fetch_add(1, Ordering::Relaxed);
 
-        let name = format!("actix-rt|system:{}|arbiter:{}", system_id, arb_id);
+        let name = format!("actix-rt|system:{system_id}|arbiter:{arb_id}");
         let (tx, rx) = mpsc::unbounded_channel();
 
         let (ready_tx, ready_rx) = std::sync::mpsc::channel::<()>();
diff --git a/actix-server/src/worker.rs b/actix-server/src/worker.rs
index dcecda0e..30554c84 100644
--- a/actix-server/src/worker.rs
+++ b/actix-server/src/worker.rs
@@ -224,9 +224,10 @@ impl WorkerService {
     }
 }
 
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
 enum WorkerServiceStatus {
     Available,
+    #[default]
     Unavailable,
     Failed,
     Restarting,
@@ -234,12 +235,6 @@ enum WorkerServiceStatus {
     Stopped,
 }
 
-impl Default for WorkerServiceStatus {
-    fn default() -> Self {
-        Self::Unavailable
-    }
-}
-
 /// Config for worker behavior passed down from server builder.
 #[derive(Debug, Clone, Copy)]
 pub(crate) struct ServerWorkerConfig {
@@ -543,8 +538,10 @@ impl ServerWorker {
     }
 }
 
+#[derive(Default)]
 enum WorkerState {
     Available,
+    #[default]
     Unavailable,
     Restarting(Restart),
     Shutdown(Shutdown),
@@ -568,12 +565,6 @@ struct Shutdown {
     tx: oneshot::Sender<bool>,
 }
 
-impl Default for WorkerState {
-    fn default() -> Self {
-        Self::Unavailable
-    }
-}
-
 impl Drop for ServerWorker {
     fn drop(&mut self) {
         Arbiter::try_current().as_ref().map(ArbiterHandle::stop);
diff --git a/actix-tls/src/connect/connect_addrs.rs b/actix-tls/src/connect/connect_addrs.rs
index 13e4c4fa..467cf9d9 100644
--- a/actix-tls/src/connect/connect_addrs.rs
+++ b/actix-tls/src/connect/connect_addrs.rs
@@ -4,8 +4,9 @@ use std::{
     net::SocketAddr,
 };
 
-#[derive(Debug, Clone, Eq, PartialEq, Hash)]
+#[derive(Debug, Clone, Eq, PartialEq, Hash, Default)]
 pub(crate) enum ConnectAddrs {
+    #[default]
     None,
     One(SocketAddr),
     // TODO: consider using smallvec
@@ -22,12 +23,6 @@ impl ConnectAddrs {
     }
 }
 
-impl Default for ConnectAddrs {
-    fn default() -> Self {
-        Self::None
-    }
-}
-
 impl From<Option<SocketAddr>> for ConnectAddrs {
     fn from(addr: Option<SocketAddr>) -> Self {
         match addr {
diff --git a/actix-tls/src/connect/resolver.rs b/actix-tls/src/connect/resolver.rs
index e5d1b891..dedb9ae2 100644
--- a/actix-tls/src/connect/resolver.rs
+++ b/actix-tls/src/connect/resolver.rs
@@ -49,23 +49,18 @@ impl<R: Host> ServiceFactory<ConnectInfo<R>> for Resolver {
     }
 }
 
-#[derive(Clone)]
+#[derive(Clone, Default)]
 enum ResolverKind {
     /// Built-in DNS resolver.
     ///
     /// See [`std::net::ToSocketAddrs`] trait.
+    #[default]
     Default,
 
     /// Custom, user-provided DNS resolver.
     Custom(Rc<dyn Resolve>),
 }
 
-impl Default for ResolverKind {
-    fn default() -> Self {
-        Self::Default
-    }
-}
-
 /// DNS resolver service.
 #[derive(Clone, Default)]
 pub struct ResolverService {