diff --git a/matrix_sdk/src/client.rs b/matrix_sdk/src/client.rs
index ee5a4fbe..45ddb9e9 100644
--- a/matrix_sdk/src/client.rs
+++ b/matrix_sdk/src/client.rs
@@ -963,7 +963,7 @@ impl Client {
                     let event = event.clone().into();
 
                     if let AnySyncMessageEvent::RoomEncrypted(e) = event {
-                        if let Ok(decrypted) = machine.decrypt_room_event(&e, &room_id).await {
+                        if let Ok(decrypted) = machine.decrypt_room_event(&e, room_id).await {
                             let event = decrypted
                                 .event
                                 .deserialize()
diff --git a/matrix_sdk/src/room/joined.rs b/matrix_sdk/src/room/joined.rs
index 2d5be644..04d56a20 100644
--- a/matrix_sdk/src/room/joined.rs
+++ b/matrix_sdk/src/room/joined.rs
@@ -461,9 +461,9 @@ impl Joined {
             #[cfg(feature = "encryption")]
             let mut reader = AttachmentEncryptor::new(reader);
             #[cfg(feature = "encryption")]
-            let content_type = mime::APPLICATION_OCTET_STREAM;
+            let content_type = &mime::APPLICATION_OCTET_STREAM;
 
-            let response = self.client.upload(&content_type, &mut reader).await?;
+            let response = self.client.upload(content_type, &mut reader).await?;
 
             #[cfg(feature = "encryption")]
             let keys: Option<Box<EncryptedFile>> = {
diff --git a/matrix_sdk_crypto/src/verification/machine.rs b/matrix_sdk_crypto/src/verification/machine.rs
index fbab484f..af18ba11 100644
--- a/matrix_sdk_crypto/src/verification/machine.rs
+++ b/matrix_sdk_crypto/src/verification/machine.rs
@@ -484,7 +484,7 @@ impl VerificationMachine {
                             }
                         }
                         Some(Verification::QrV1(qr)) => {
-                            let (cancellation, request) = qr.receive_done(&c).await?;
+                            let (cancellation, request) = qr.receive_done(c).await?;
 
                             if let Some(c) = cancellation {
                                 self.verifications.add_request(c.into())
diff --git a/matrix_sdk_crypto/src/verification/mod.rs b/matrix_sdk_crypto/src/verification/mod.rs
index 20ed6105..ee89552d 100644
--- a/matrix_sdk_crypto/src/verification/mod.rs
+++ b/matrix_sdk_crypto/src/verification/mod.rs
@@ -177,7 +177,7 @@ pub struct CancelInfo {
 impl CancelInfo {
     /// Get the human readable reason of the cancellation.
     pub fn reason(&self) -> &'static str {
-        &self.reason
+        self.reason
     }
 
     /// Get the `CancelCode` that cancelled this verification.
diff --git a/matrix_sdk_crypto/src/verification/requests.rs b/matrix_sdk_crypto/src/verification/requests.rs
index f20d6d15..c41b1a5e 100644
--- a/matrix_sdk_crypto/src/verification/requests.rs
+++ b/matrix_sdk_crypto/src/verification/requests.rs
@@ -389,7 +389,7 @@ impl VerificationRequest {
 
         inner.accept(methods).map(|c| match c {
             OutgoingContent::ToDevice(content) => {
-                ToDeviceRequest::new(&self.other_user(), inner.other_device_id(), content).into()
+                ToDeviceRequest::new(self.other_user(), inner.other_device_id(), content).into()
             }
             OutgoingContent::Room(room_id, content) => {
                 RoomMessageRequest { room_id, txn_id: Uuid::new_v4(), content }.into()
@@ -433,14 +433,14 @@ impl VerificationRequest {
             OutgoingContent::ToDevice(content) => {
                 if send_to_everyone {
                     ToDeviceRequest::new_for_recipients(
-                        &self.other_user(),
+                        self.other_user(),
                         self.recipient_devices.to_vec(),
                         content,
                         Uuid::new_v4(),
                     )
                     .into()
                 } else {
-                    ToDeviceRequest::new(&self.other_user(), other_device, content).into()
+                    ToDeviceRequest::new(self.other_user(), other_device, content).into()
                 }
             }
             OutgoingContent::Room(room_id, content) => {
@@ -621,7 +621,7 @@ impl VerificationRequest {
 
                     let request = match content {
                         OutgoingContent::ToDevice(content) => ToDeviceRequest::new(
-                            &self.other_user(),
+                            self.other_user(),
                             inner.other_device_id(),
                             content,
                         )