diff --git a/butcher/src/trend_setter.rs b/butcher/src/trend_setter.rs
index 6859483..86b48aa 100644
--- a/butcher/src/trend_setter.rs
+++ b/butcher/src/trend_setter.rs
@@ -175,7 +175,7 @@ async fn run(
 
     // print
     for (period, keep, total, remove, add) in updates.clone() {
-        if add.len() > 0 || remove.len() > 0 {
+        if !add.is_empty() || !remove.is_empty() {
             tracing::info!("Trending in {:?} for {} of {}/{}: +{:?} -{:?}", language, period, keep, total, add, remove);
         }
     }
diff --git a/buzzback/src/main.rs b/buzzback/src/main.rs
index c7a598d..2226783 100644
--- a/buzzback/src/main.rs
+++ b/buzzback/src/main.rs
@@ -30,7 +30,7 @@ async fn follow_back(
     let key_id = format!("{}#key", follow.actor);
     let result = activitypub::send::send(
         client, &follow.inbox,
-        &key_id, &priv_key,
+        &key_id, priv_key,
         &action,
     ).await;
     match result {
diff --git a/cave/src/activitypub/mod.rs b/cave/src/activitypub/mod.rs
index 638e374..f885453 100644
--- a/cave/src/activitypub/mod.rs
+++ b/cave/src/activitypub/mod.rs
@@ -115,7 +115,7 @@ impl Post {
                 bot: actor.actor_type != "Person",
             },
             tags: self.tag.into_iter().filter_map(|mut tag| {
-                while tag.name.chars().next() == Some('#') {
+                while tag.name.starts_with('#') {
                     tag.name.remove(0);
                 }
                 if let Some(c) = tag.name.chars().next() {
diff --git a/cave/src/block_list.rs b/cave/src/block_list.rs
index dcdc5c3..1ab4e64 100644
--- a/cave/src/block_list.rs
+++ b/cave/src/block_list.rs
@@ -15,7 +15,6 @@ impl Leaf {
     pub fn insert(&mut self, host: &str) {
         match self {
             Leaf::Blocked => {
-                return;
             }
             &mut Leaf::Tree(ref mut tree) => {
                 if let Some(pos) = host.rfind('.') {
@@ -33,7 +32,7 @@ impl Leaf {
         match self {
             Leaf::Blocked =>
                 true,
-            Leaf::Tree(ref tree) if host.len() > 0 => {
+            Leaf::Tree(ref tree) if !host.is_empty() => {
                 let (label, new_host) = if let Some(pos) = host.rfind('.') {
                     (&host[pos + 1..], &host[..pos])
                 } else {
@@ -62,8 +61,8 @@ impl BlockList {
             let mut root = Leaf::Tree(HashMap::new());
             let mut file = BufReader::new(file);
             let mut line = String::new();
-            while let Ok(_) = file.read_line(&mut line).await {
-                if line == "" {
+            while (file.read_line(&mut line).await).is_ok() {
+                if line.is_empty() {
                     break
                 }
 
@@ -106,11 +105,11 @@ async fn test_blocklist() {
     root.insert("bad.actor");
     root.insert("evil.actor");
     drop(root);
-    assert_eq!(true, bl.is_blocked("bad.actor").await);
-    assert_eq!(true, bl.is_blocked("evil.actor").await);
-    assert_eq!(false, bl.is_blocked("good.actor").await);
-    assert_eq!(false, bl.is_blocked("not-bad.actor").await);
-    assert_eq!(false, bl.is_blocked("actor").await);
+    assert!(bl.is_blocked("bad.actor").await);
+    assert!(bl.is_blocked("evil.actor").await);
+    assert!(!bl.is_blocked("good.actor").await);
+    assert!(!bl.is_blocked("not-bad.actor").await);
+    assert!(!bl.is_blocked("actor").await);
 }
 
 #[cfg(test)]
@@ -121,6 +120,6 @@ async fn test_blocklist_subdomain() {
     };
     bl.tree.write().await
         .insert("bad.actor");
-    assert_eq!(true, bl.is_blocked("bad.actor").await);
-    assert_eq!(true, bl.is_blocked("very.bad.actor").await);
+    assert!(bl.is_blocked("bad.actor").await);
+    assert!(bl.is_blocked("very.bad.actor").await);
 }
diff --git a/cave/src/config.rs b/cave/src/config.rs
index 809a97b..efe67d4 100644
--- a/cave/src/config.rs
+++ b/cave/src/config.rs
@@ -4,9 +4,7 @@ pub trait LoadConfig {
 
 impl<T: Sized + for<'a> serde::Deserialize<'a>> LoadConfig for T {
     fn load() -> Self {
-        let path = std::env::args()
-            .skip(1)
-            .next()
+        let path = std::env::args().nth(1)
             .expect("Call with config.yaml");
         crate::systemd::status(&format!("Loading config file {}", path));
 
diff --git a/cave/src/lib.rs b/cave/src/lib.rs
index 26b11fb..74b710b 100644
--- a/cave/src/lib.rs
+++ b/cave/src/lib.rs
@@ -19,5 +19,5 @@ pub const PERIODS: &[u64] = &[4, 24, 7 * 24];
 pub const PERIOD_COMPARE_WINDOW: u64 = 3;
 
 pub fn current_hour() -> u64 {
-    chrono::offset::Utc::now().naive_utc().timestamp() as u64 / 3600
+    chrono::offset::Utc::now().timestamp() as u64 / 3600
 }
diff --git a/cave/src/store.rs b/cave/src/store.rs
index 4c48dad..cc71878 100644
--- a/cave/src/store.rs
+++ b/cave/src/store.rs
@@ -175,7 +175,7 @@ impl Store {
                 return;
             }
         };
-        let hour = timestamp.naive_utc().timestamp() as u64 / 3600;
+        let hour = timestamp.to_utc().timestamp() as u64 / 3600;
         let until = current_hour();
         if hour > until {
             tracing::warn!("future post from {}", timestamp);
@@ -209,7 +209,7 @@ impl Store {
             ).ignore();
             if let Some(user_id) = &user_id {
                 // users by tag/hour
-                cmd.sadd(&user_key, &user_id).ignore()
+                cmd.sadd(&user_key, user_id).ignore()
                     .expire(&user_key, TAG_EXPIRE as usize * 3600)
                     .ignore();
             }
@@ -380,7 +380,7 @@ impl Store {
         let names = names.map(|name| {
             cmd.hgetall(tag_key(language, &name));
             for hour in from..=until {
-                cmd.scard(format!("u:{}:{}:{}", language.as_ref().map_or("", |l| &l), hour, name));
+                cmd.scard(format!("u:{}:{}:{}", language.as_ref().map_or("", |l| l), hour, name));
             }
             name
         }).collect::<Vec<String>>();
diff --git a/cave/src/trend_tag.rs b/cave/src/trend_tag.rs
index 373b33f..9238d0f 100644
--- a/cave/src/trend_tag.rs
+++ b/cave/src/trend_tag.rs
@@ -38,7 +38,7 @@ impl TrendTag {
 
     pub fn score(&self, period: u64, until: u64) -> f64 {
         // ignore spam that comes from only 1 instance
-        if self.hosts().skip(1).next().is_none() {
+        if self.hosts().nth(1).is_none() {
             return -1.;
         }
 
@@ -48,7 +48,7 @@ impl TrendTag {
         let mut before_hours = 0;
         let mut after_mentions = 0;
 
-        for (hour, mut mentions) in self.hour_users.iter().cloned() {
+        for (hour, mentions) in self.hour_users.iter().cloned() {
             if hour > from {
                 if mentions > 1 {
                     after_mentions += mentions;
diff --git a/cave/src/word_list.rs b/cave/src/word_list.rs
index 465e879..724d2c8 100644
--- a/cave/src/word_list.rs
+++ b/cave/src/word_list.rs
@@ -16,8 +16,8 @@ impl WordList {
             let mut list = HashSet::new();
             let mut file = BufReader::new(file);
             let mut line = String::new();
-            while let Ok(_) = file.read_line(&mut line).await {
-                if line == "" {
+            while (file.read_line(&mut line).await).is_ok() {
+                if line.is_empty() {
                     break
                 }
 
diff --git a/gatherer/src/http_server.rs b/gatherer/src/http_server.rs
index c496ed8..ac607bf 100644
--- a/gatherer/src/http_server.rs
+++ b/gatherer/src/http_server.rs
@@ -1,5 +1,5 @@
 use std::{
-    collections::{HashMap, HashSet}, net::SocketAddr, ops::Deref, pin::Pin
+    collections::{HashMap, HashSet}, net::SocketAddr, ops::Deref
 };
 use askama::Template;
 use axum::{
@@ -11,16 +11,16 @@ use axum::{
     routing::get,
     Router,
     middleware::{Next, self},
-    body::{Body, Bytes},
+    body::{Body},
 };
-use futures::{stream, Future, StreamExt};
+use futures::{stream, StreamExt};
 use futures::future::{join, join_all};
 use cave::{
     firehose::FirehoseFactory,
     store::{Store, TREND_POOL_SIZE}, PERIODS,
     systemd, db::Database,
 };
-use http_body::combinators::UnsyncBoxBody;
+
 use metrics_exporter_prometheus::PrometheusHandle;
 use crate::{
     html_template::HtmlTemplate,
@@ -186,7 +186,7 @@ async fn streaming_api(
         .status(200)
         .header("content-type", "text/event-stream")
         .header("cache-control", "no-store")
-        .body(body.into())
+        .body(body)
         .expect("Response")
 }
 
diff --git a/gatherer/src/http_server/token_collect.rs b/gatherer/src/http_server/token_collect.rs
index 7264322..72c0bcc 100644
--- a/gatherer/src/http_server/token_collect.rs
+++ b/gatherer/src/http_server/token_collect.rs
@@ -17,16 +17,16 @@ async fn collect_token(
     code: String,
 ) -> Result<(), String> {
     // try a few registered apps until one works
-    for (client_id, client_secret) in db.get_apps(&host).await
+    for (client_id, client_secret) in db.get_apps(host).await
         .map_err(|e| format!("{}", e))?
     {
         let app = oauth::Application {
             client_id,
             client_secret,
         };
-        match app.obtain_token(http_client, &host, code.clone()).await {
+        match app.obtain_token(http_client, host, code.clone()).await {
             Ok(token) => {
-                db.add_token(&host, &app.client_id, &token).await
+                db.add_token(host, &app.client_id, &token).await
                     .expect("db.add_token");
                 // success, done!
                 return Ok(());
@@ -62,11 +62,11 @@ pub async fn get_token_collect(
         }
         Err(e) => {
             tracing::error!("{}", e);
-            return (
+            (
                 StatusCode::INTERNAL_SERVER_ERROR,
                 [("content-type", "text/plain")],
                 e
-            ).into_response();
+            ).into_response()
         }
     }
 }
diff --git a/gatherer/src/trends.rs b/gatherer/src/trends.rs
index 029a040..239371e 100644
--- a/gatherer/src/trends.rs
+++ b/gatherer/src/trends.rs
@@ -111,10 +111,10 @@ impl TrendAnalyzer {
 
         self.result.insert(ScoreKey { score, tag: name.clone(), }, tag.clone());
 
-        let mut least = self.result.keys().cloned().next().unwrap();
+        let mut least = self.result.keys().next().cloned().unwrap();
         if self.result.len() > self.size {
             self.result.remove(&least);
-            least = self.result.keys().cloned().next().unwrap().clone();
+            least = self.result.keys().next().cloned().unwrap().clone();
         }
 
         self.score_threshold = Some(least.score);
diff --git a/hunter/src/main.rs b/hunter/src/main.rs
index b5b30d4..d6741b3 100644
--- a/hunter/src/main.rs
+++ b/hunter/src/main.rs
@@ -63,7 +63,7 @@ async fn run() {
             .await.expect("get_hosts");
         pin_mut!(hosts);
         while let Some(host) = hosts.next().await {
-            if scheduler.introduce(InstanceHost::just_host(host.clone())).await == false {
+            if ! scheduler.introduce(InstanceHost::just_host(host.clone())).await {
                 tracing::debug!("Remove host {}", host);
                 store.remove_host(&host).await.expect("remove_host");
             }
diff --git a/hunter/src/worker.rs b/hunter/src/worker.rs
index 42be8bb..3874255 100644
--- a/hunter/src/worker.rs
+++ b/hunter/src/worker.rs
@@ -113,7 +113,7 @@ pub async fn run(
             if let Ok(hosts) = webfinger_result {
                 for host in hosts {
                     message_tx.send(Message::IntroduceHost(InstanceHost {
-                        host: host,
+                        host,
                         known_user: None,
                     })).unwrap();
                 }
@@ -182,7 +182,7 @@ async fn fetch_timeline(
 
     metrics::increment_gauge!("hunter_requests", 1.0, "type" => "timeline");
     let t1 = Instant::now();
-    let result = Feed::fetch(&client, &url).await;
+    let result = Feed::fetch(client, &url).await;
     let t2 = Instant::now();
     metrics::decrement_gauge!("hunter_requests", 1.0, "type" => "timeline");
     metrics::histogram!("hunter_fetch_seconds", t2 - t1, "result" => if result.is_ok() { "ok" } else { "error" });
@@ -191,13 +191,13 @@ async fn fetch_timeline(
 
     let mean_interval = feed.mean_post_interval();
 
-    let (new_post_ratio, introduce_hosts) = process_posts(&mut store, posts_cache, block_list, &host, feed.posts.into_iter()).await;
+    let (new_post_ratio, introduce_hosts) = process_posts(&mut store, posts_cache, block_list, host, feed.posts.into_iter()).await;
     for introduce_host in introduce_hosts.into_iter() {
         message_tx.send(Message::IntroduceHost(introduce_host)).unwrap();
     }
 
     // successfully fetched, save for future run
-    store.save_host(&host).await.unwrap();
+    store.save_host(host).await.unwrap();
 
     Ok((new_post_ratio, mean_interval))
 }
@@ -235,7 +235,7 @@ async fn process_posts(
 
             scan_for_hosts(&mut introduce_hosts, &post);
             if let Some(reblog) = &post.reblog {
-                scan_for_hosts(&mut introduce_hosts, &reblog);
+                scan_for_hosts(&mut introduce_hosts, reblog);
             }
 
             if let Some(account_host) = post.account.host() {
diff --git a/smokestack/src/main.rs b/smokestack/src/main.rs
index 99ce193..77a34fb 100644
--- a/smokestack/src/main.rs
+++ b/smokestack/src/main.rs
@@ -57,7 +57,7 @@ fn html_to_text(html: &str) -> String {
 fn language_colour(language: &str) -> Colour {
     let x = language.bytes().fold(0, |x, b| x ^ b);
     let b = language.as_bytes();
-    let y = if b.len() >= 1 {
+    let y = if !b.is_empty() {
         (b[0] & 0x1F) << 2
     } else {
         127