diff --git a/src/client_server/room.rs b/src/client_server/room.rs
index d1c79dff..eb68135f 100644
--- a/src/client_server/room.rs
+++ b/src/client_server/room.rs
@@ -475,7 +475,7 @@ pub async fn upgrade_room_route(
         PduBuilder {
             event_type: EventType::RoomTombstone,
             content: to_raw_value(&RoomTombstoneEventContent {
-                body: "This room has been replaced".to_string(),
+                body: "This room has been replaced".to_owned(),
                 replacement_room: replacement_room.clone(),
             })
             .expect("event is valid, we just created it"),
diff --git a/src/database.rs b/src/database.rs
index 110d4d0c..63c4ebc4 100644
--- a/src/database.rs
+++ b/src/database.rs
@@ -499,13 +499,13 @@ impl Database {
                             if let Some(parent_stateinfo) = states_parents.last() {
                                 let statediffnew = current_state
                                     .difference(&parent_stateinfo.1)
-                                    .cloned()
+                                    .copied()
                                     .collect::<HashSet<_>>();
 
                                 let statediffremoved = parent_stateinfo
                                     .1
                                     .difference(&current_state)
-                                    .cloned()
+                                    .copied()
                                     .collect::<HashSet<_>>();
 
                                 (statediffnew, statediffremoved)
diff --git a/src/database/abstraction.rs b/src/database/abstraction.rs
index 5b941fbe..11bbc3b1 100644
--- a/src/database/abstraction.rs
+++ b/src/database/abstraction.rs
@@ -22,7 +22,7 @@ pub trait Tree: Send + Sync {
     fn get(&self, key: &[u8]) -> Result<Option<Vec<u8>>>;
 
     fn insert(&self, key: &[u8], value: &[u8]) -> Result<()>;
-    fn insert_batch<'a>(&self, iter: &mut dyn Iterator<Item = (Vec<u8>, Vec<u8>)>) -> Result<()>;
+    fn insert_batch(&self, iter: &mut dyn Iterator<Item = (Vec<u8>, Vec<u8>)>) -> Result<()>;
 
     fn remove(&self, key: &[u8]) -> Result<()>;
 
@@ -35,7 +35,7 @@ pub trait Tree: Send + Sync {
     ) -> Box<dyn Iterator<Item = (Vec<u8>, Vec<u8>)> + 'a>;
 
     fn increment(&self, key: &[u8]) -> Result<Vec<u8>>;
-    fn increment_batch<'a>(&self, iter: &mut dyn Iterator<Item = Vec<u8>>) -> Result<()>;
+    fn increment_batch(&self, iter: &mut dyn Iterator<Item = Vec<u8>>) -> Result<()>;
 
     fn scan_prefix<'a>(
         &'a self,
diff --git a/src/database/key_backups.rs b/src/database/key_backups.rs
index 27d8030d..a960c72f 100644
--- a/src/database/key_backups.rs
+++ b/src/database/key_backups.rs
@@ -81,7 +81,7 @@ impl KeyBackups {
         )?;
         self.backupid_etag
             .insert(&key, &globals.next_count()?.to_be_bytes())?;
-        Ok(version.to_string())
+        Ok(version.to_owned())
     }
 
     pub fn get_latest_backup_version(&self, user_id: &UserId) -> Result<Option<String>> {
diff --git a/src/database/proxy.rs b/src/database/proxy.rs
index 78e9d2bf..33f7f3d9 100644
--- a/src/database/proxy.rs
+++ b/src/database/proxy.rs
@@ -136,7 +136,7 @@ impl std::str::FromStr for WildCardedDomain {
         })
     }
 }
-impl<'de> serde::de::Deserialize<'de> for WildCardedDomain {
+impl<'de> Deserialize<'de> for WildCardedDomain {
     fn deserialize<D>(deserializer: D) -> std::result::Result<Self, D::Error>
     where
         D: serde::de::Deserializer<'de>,
diff --git a/src/database/rooms.rs b/src/database/rooms.rs
index 3096150d..1912e0c8 100644
--- a/src/database/rooms.rs
+++ b/src/database/rooms.rs
@@ -50,7 +50,7 @@ pub type StateHashId = Vec<u8>;
 pub type CompressedStateEvent = [u8; 2 * size_of::<u64>()];
 
 pub struct Rooms {
-    pub edus: edus::RoomEdus,
+    pub edus: RoomEdus,
     pub(super) pduid_pdu: Arc<dyn Tree>, // PduId = ShortRoomId + Count
     pub(super) eventid_pduid: Arc<dyn Tree>,
     pub(super) roomid_pduleaves: Arc<dyn Tree>,
@@ -371,13 +371,13 @@ impl Rooms {
         {
             let statediffnew = new_state_ids_compressed
                 .difference(&parent_stateinfo.1)
-                .cloned()
+                .copied()
                 .collect::<HashSet<_>>();
 
             let statediffremoved = parent_stateinfo
                 .1
                 .difference(&new_state_ids_compressed)
-                .cloned()
+                .copied()
                 .collect::<HashSet<_>>();
 
             (statediffnew, statediffremoved)
@@ -498,7 +498,7 @@ impl Rooms {
         if parent != 0_u64 {
             let mut response = self.load_shortstatehash_info(parent)?;
             let mut state = response.last().unwrap().1.clone();
-            state.extend(added.iter().cloned());
+            state.extend(added.iter().copied());
             for r in &removed {
                 state.remove(r);
             }
@@ -1773,13 +1773,13 @@ impl Rooms {
                 if let Some(parent_stateinfo) = states_parents.last() {
                     let statediffnew = state_ids_compressed
                         .difference(&parent_stateinfo.1)
-                        .cloned()
+                        .copied()
                         .collect::<HashSet<_>>();
 
                     let statediffremoved = parent_stateinfo
                         .1
                         .difference(&state_ids_compressed)
-                        .cloned()
+                        .copied()
                         .collect::<HashSet<_>>();
 
                     (statediffnew, statediffremoved)
diff --git a/src/database/rooms/edus.rs b/src/database/rooms/edus.rs
index e0639ffd..26f22bf4 100644
--- a/src/database/rooms/edus.rs
+++ b/src/database/rooms/edus.rs
@@ -331,7 +331,7 @@ impl RoomEdus {
         &self,
         user_id: &UserId,
         room_id: &RoomId,
-        presence: ruma::events::presence::PresenceEvent,
+        presence: PresenceEvent,
         globals: &super::super::globals::Globals,
     ) -> Result<()> {
         // TODO: Remove old entry? Or maybe just wipe completely from time to time?
diff --git a/src/lib.rs b/src/lib.rs
index fbffb7e3..82b8f340 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,9 @@
+#![warn(
+    rust_2018_idioms,
+    unused_qualifications,
+    clippy::cloned_instead_of_copied,
+    clippy::str_to_string
+)]
 #![allow(clippy::suspicious_else_formatting)]
 #![deny(clippy::dbg_macro)]
 
diff --git a/src/main.rs b/src/main.rs
index 06409eeb..84dfb1fc 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,4 +1,9 @@
-#![warn(rust_2018_idioms)]
+#![warn(
+    rust_2018_idioms,
+    unused_qualifications,
+    clippy::cloned_instead_of_copied,
+    clippy::str_to_string
+)]
 #![allow(clippy::suspicious_else_formatting)]
 #![deny(clippy::dbg_macro)]
 
diff --git a/src/pdu.rs b/src/pdu.rs
index b74d079c..0a765e1f 100644
--- a/src/pdu.rs
+++ b/src/pdu.rs
@@ -257,7 +257,7 @@ impl PduEvent {
         mut json: CanonicalJsonObject,
     ) -> Result<Self, serde_json::Error> {
         json.insert(
-            "event_id".to_string(),
+            "event_id".to_owned(),
             CanonicalJsonValue::String(event_id.as_str().to_owned()),
         );
 
diff --git a/src/ruma_wrapper.rs b/src/ruma_wrapper.rs
index 4629de92..03c115cd 100644
--- a/src/ruma_wrapper.rs
+++ b/src/ruma_wrapper.rs
@@ -344,7 +344,7 @@ impl<T: Outgoing> Deref for Ruma<T> {
 }
 
 /// This struct converts ruma responses into rocket http responses.
-pub type ConduitResult<T> = std::result::Result<RumaResponse<T>, Error>;
+pub type ConduitResult<T> = Result<RumaResponse<T>, Error>;
 
 pub fn response<T: OutgoingResponse>(response: RumaResponse<T>) -> response::Result<'static> {
     let http_response = response
diff --git a/src/server_server.rs b/src/server_server.rs
index 805ae3a3..e9a94856 100644
--- a/src/server_server.rs
+++ b/src/server_server.rs
@@ -336,7 +336,7 @@ fn add_port_to_hostname(destination_str: &str) -> FedDest {
         None => (destination_str, ":8448"),
         Some(pos) => destination_str.split_at(pos),
     };
-    FedDest::Named(host.to_string(), port.to_string())
+    FedDest::Named(host.to_owned(), port.to_owned())
 }
 
 /// Returns: actual_destination, host header
@@ -358,7 +358,7 @@ async fn find_actual_destination(
             if let Some(pos) = destination_str.find(':') {
                 // 2: Hostname with included port
                 let (host, port) = destination_str.split_at(pos);
-                FedDest::Named(host.to_string(), port.to_string())
+                FedDest::Named(host.to_owned(), port.to_owned())
             } else {
                 match request_well_known(globals, destination.as_str()).await {
                     // 3: A .well-known file is available
@@ -370,7 +370,7 @@ async fn find_actual_destination(
                                 if let Some(pos) = delegated_hostname.find(':') {
                                     // 3.2: Hostname with port in .well-known file
                                     let (host, port) = delegated_hostname.split_at(pos);
-                                    FedDest::Named(host.to_string(), port.to_string())
+                                    FedDest::Named(host.to_owned(), port.to_owned())
                                 } else {
                                     // Delegated hostname has no port in this branch
                                     if let Some(hostname_override) =
@@ -454,12 +454,12 @@ async fn find_actual_destination(
     let hostname = if let Ok(addr) = hostname.parse::<SocketAddr>() {
         FedDest::Literal(addr)
     } else if let Ok(addr) = hostname.parse::<IpAddr>() {
-        FedDest::Named(addr.to_string(), ":8448".to_string())
+        FedDest::Named(addr.to_string(), ":8448".to_owned())
     } else if let Some(pos) = hostname.find(':') {
         let (host, port) = hostname.split_at(pos);
-        FedDest::Named(host.to_string(), port.to_string())
+        FedDest::Named(host.to_owned(), port.to_owned())
     } else {
-        FedDest::Named(hostname, ":8448".to_string())
+        FedDest::Named(hostname, ":8448".to_owned())
     };
     (actual_destination, hostname)
 }
@@ -476,11 +476,7 @@ async fn query_srv_record(
         .map(|srv| {
             srv.iter().next().map(|result| {
                 FedDest::Named(
-                    result
-                        .target()
-                        .to_string()
-                        .trim_end_matches('.')
-                        .to_string(),
+                    result.target().to_string().trim_end_matches('.').to_owned(),
                     format!(":{}", result.port()),
                 )
             })
@@ -745,7 +741,7 @@ pub async fn send_transaction_message_route(
             Some(id) => id,
             None => {
                 // Event is invalid
-                resolved_map.insert(event_id, Err("Event needs a valid RoomId.".to_string()));
+                resolved_map.insert(event_id, Err("Event needs a valid RoomId.".to_owned()));
                 continue;
             }
         };
@@ -963,7 +959,7 @@ pub(crate) async fn handle_incoming_pdu<'a>(
     match db.rooms.exists(room_id) {
         Ok(true) => {}
         _ => {
-            return Err("Room is unknown to this server.".to_string());
+            return Err("Room is unknown to this server.".to_owned());
         }
     }
 
@@ -1173,14 +1169,14 @@ fn handle_outlier_pdu<'a>(
             Err(e) => {
                 // Drop
                 warn!("Dropping bad event {}: {}", event_id, e);
-                return Err("Signature verification failed".to_string());
+                return Err("Signature verification failed".to_owned());
             }
             Ok(ruma::signatures::Verified::Signatures) => {
                 // Redact
                 warn!("Calculated hash does not match: {}", event_id);
                 match ruma::signatures::redact(&value, room_version_id) {
                     Ok(obj) => obj,
-                    Err(_) => return Err("Redaction failed".to_string()),
+                    Err(_) => return Err("Redaction failed".to_owned()),
                 }
             }
             Ok(ruma::signatures::Verified::All) => value,
@@ -1195,7 +1191,7 @@ fn handle_outlier_pdu<'a>(
         let incoming_pdu = serde_json::from_value::<PduEvent>(
             serde_json::to_value(&val).expect("CanonicalJsonObj is a valid JsonValue"),
         )
-        .map_err(|_| "Event is not a valid PDU.".to_string())?;
+        .map_err(|_| "Event is not a valid PDU.".to_owned())?;
 
         // 4. fetch any missing auth events doing all checks listed here starting at 1. These are not timeline events
         // 5. Reject "due to auth events" if can't get all the auth events or some of the auth events are also rejected "due to auth events"
@@ -1280,9 +1276,9 @@ fn handle_outlier_pdu<'a>(
             None::<PduEvent>, // TODO: third party invite
             |k, s| auth_events.get(&(k.clone(), s.to_owned())),
         )
-        .map_err(|_e| "Auth check failed".to_string())?
+        .map_err(|_e| "Auth check failed".to_owned())?
         {
-            return Err("Event has failed auth check with auth events.".to_string());
+            return Err("Event has failed auth check with auth events.".to_owned());
         }
 
         debug!("Validation successful.");
@@ -2256,7 +2252,7 @@ pub(crate) fn get_auth_chain<'a>(
             .collect::<Vec<u64>>();
         if let Some(cached) = db.rooms.get_auth_chain_from_cache(&chunk_key)? {
             hits += 1;
-            full_auth_chain.extend(cached.iter().cloned());
+            full_auth_chain.extend(cached.iter().copied());
             continue;
         }
         misses += 1;
@@ -2267,7 +2263,7 @@ pub(crate) fn get_auth_chain<'a>(
         for (sevent_id, event_id) in chunk {
             if let Some(cached) = db.rooms.get_auth_chain_from_cache(&[sevent_id])? {
                 hits2 += 1;
-                chunk_cache.extend(cached.iter().cloned());
+                chunk_cache.extend(cached.iter().copied());
             } else {
                 misses2 += 1;
                 let auth_chain = Arc::new(get_auth_chain_inner(room_id, &event_id, db)?);
@@ -3385,10 +3381,10 @@ pub(crate) async fn fetch_join_signing_keys(
         // Try to fetch keys, failure is okay
         // Servers we couldn't find in the cache will be added to `servers`
         for pdu in &event.room_state.state {
-            let _ = get_server_keys_from_cache(&pdu, &mut servers, room_version, &mut pkm, db);
+            let _ = get_server_keys_from_cache(pdu, &mut servers, room_version, &mut pkm, db);
         }
         for pdu in &event.room_state.auth_chain {
-            let _ = get_server_keys_from_cache(&pdu, &mut servers, room_version, &mut pkm, db);
+            let _ = get_server_keys_from_cache(pdu, &mut servers, room_version, &mut pkm, db);
         }
 
         drop(pkm);
diff --git a/src/utils.rs b/src/utils.rs
index d21395e1..26d71a8c 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -123,7 +123,7 @@ pub fn deserialize_from_str<
     E: std::fmt::Display,
 >(
     deserializer: D,
-) -> std::result::Result<T, D::Error> {
+) -> Result<T, D::Error> {
     struct Visitor<T: FromStr<Err = E>, E>(std::marker::PhantomData<T>);
     impl<'de, T: FromStr<Err = Err>, Err: std::fmt::Display> serde::de::Visitor<'de>
         for Visitor<T, Err>