diff --git a/Cargo.toml b/Cargo.toml
index ceaa9d53..145d117c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,7 +26,7 @@ serde = "1.0.106"
 serde_json = "1.0.51"
 
 # Ruma dependencies
-js_int = "0.1.4"
+js_int = "0.1.5"
 ruma-api = "0.16.0-rc.2"
 ruma-client-api = { version = "0.8.0-rc.5" }
 ruma-events = { version = "0.21.0-beta.1" }
diff --git a/src/base_client.rs b/src/base_client.rs
index 1fa0315c..83c76585 100644
--- a/src/base_client.rs
+++ b/src/base_client.rs
@@ -223,7 +223,7 @@ impl Client {
 
     pub(crate) async fn calculate_room_names(&self) -> Vec<String> {
         let mut res = Vec::new();
-        for (_id, room) in &self.joined_rooms {
+        for room in self.joined_rooms.values() {
             let room = room.read().await;
             res.push(room.room_name.calculate_name(&room.members))
         }
diff --git a/src/models/room.rs b/src/models/room.rs
index 05178f4c..8700eb03 100644
--- a/src/models/room.rs
+++ b/src/models/room.rs
@@ -147,13 +147,13 @@ impl RoomName {
         } else if !self.aliases.is_empty() && !self.aliases[0].alias().is_empty() {
             self.aliases[0].alias().trim().to_string()
         } else {
-            let joined = self.joined_member_count.unwrap_or(UInt::min_value());
-            let invited = self.invited_member_count.unwrap_or(UInt::min_value());
+            let joined = self.joined_member_count.unwrap_or(UInt::MIN);
+            let invited = self.invited_member_count.unwrap_or(UInt::MIN);
             let heroes = UInt::new(self.heroes.len() as u64).unwrap();
             let one = UInt::new(1).unwrap();
 
-            let invited_joined = if invited + joined == UInt::min_value() {
-                UInt::min_value()
+            let invited_joined = if invited + joined == UInt::MIN {
+                UInt::MIN
             } else {
                 invited + joined - one
             };
@@ -166,8 +166,7 @@ impl RoomName {
                     .map(|mem| {
                         mem.display_name
                             .clone()
-                            .unwrap_or(mem.user_id.localpart().to_string())
-                            .to_string()
+                            .unwrap_or_else(|| mem.user_id.localpart().to_string())
                     })
                     .collect::<Vec<String>>();
                 // stabilize ordering
@@ -180,7 +179,7 @@ impl RoomName {
                     .map(|mem| {
                         mem.display_name
                             .clone()
-                            .unwrap_or(mem.user_id.localpart().to_string())
+                            .unwrap_or_else(|| mem.user_id.localpart().to_string())
                     })
                     .collect::<Vec<String>>();
                 names.sort();
diff --git a/src/request_builder.rs b/src/request_builder.rs
index a9893321..4ff56930 100644
--- a/src/request_builder.rs
+++ b/src/request_builder.rs
@@ -327,17 +327,15 @@ mod test {
             .invite_3pid(vec![])
             .is_direct(true)
             .power_level_override(PowerLevelsEventContent {
-                ban: Int::max_value(),
+                ban: Int::MAX,
                 events: BTreeMap::default(),
-                events_default: Int::min_value(),
-                invite: Int::min_value(),
-                kick: Int::min_value(),
-                redact: Int::max_value(),
-                state_default: Int::min_value(),
-                users_default: Int::min_value(),
-                notifications: NotificationPowerLevels {
-                    room: Int::min_value(),
-                },
+                events_default: Int::MIN,
+                invite: Int::MIN,
+                kick: Int::MIN,
+                redact: Int::MAX,
+                state_default: Int::MIN,
+                users_default: Int::MIN,
+                notifications: NotificationPowerLevels { room: Int::MIN },
                 users: BTreeMap::default(),
             })
             .preset(RoomPreset::PrivateChat)
diff --git a/src/test_builder.rs b/src/test_builder.rs
index db0f616a..b6badf5e 100644
--- a/src/test_builder.rs
+++ b/src/test_builder.rs
@@ -96,7 +96,7 @@ impl EventBuilder {
         variant: fn(Ev) -> Event,
     ) -> Self {
         let val = fs::read_to_string(path.as_ref())
-            .expect(&format!("file not found {:?}", path.as_ref()));
+            .unwrap_or_else(|_| panic!("file not found {:?}", path.as_ref()));
         let event = serde_json::from_str::<EventJson<Ev>>(&val)
             .unwrap()
             .deserialize()
@@ -112,7 +112,7 @@ impl EventBuilder {
         variant: fn(Ev) -> Event,
     ) -> Self {
         let val = fs::read_to_string(path.as_ref())
-            .expect(&format!("file not found {:?}", path.as_ref()));
+            .unwrap_or_else(|_| panic!("file not found {:?}", path.as_ref()));
         let event = serde_json::from_str::<EventJson<Ev>>(&val)
             .unwrap()
             .deserialize()
@@ -128,7 +128,7 @@ impl EventBuilder {
         variant: fn(Ev) -> RoomEvent,
     ) -> Self {
         let val = fs::read_to_string(path.as_ref())
-            .expect(&format!("file not found {:?}", path.as_ref()));
+            .unwrap_or_else(|_| panic!("file not found {:?}", path.as_ref()));
         let event = serde_json::from_str::<EventJson<Ev>>(&val)
             .unwrap()
             .deserialize()
@@ -144,7 +144,7 @@ impl EventBuilder {
         variant: fn(Ev) -> StateEvent,
     ) -> Self {
         let val = fs::read_to_string(path.as_ref())
-            .expect(&format!("file not found {:?}", path.as_ref()));
+            .unwrap_or_else(|_| panic!("file not found {:?}", path.as_ref()));
         let event = serde_json::from_str::<EventJson<Ev>>(&val)
             .unwrap()
             .deserialize()
@@ -156,7 +156,7 @@ impl EventBuilder {
     /// Add a presence event to the presence events `Vec`.
     pub fn add_presence_event_from_file<P: AsRef<Path>>(mut self, path: P) -> Self {
         let val = fs::read_to_string(path.as_ref())
-            .expect(&format!("file not found {:?}", path.as_ref()));
+            .unwrap_or_else(|_| panic!("file not found {:?}", path.as_ref()));
         let event = serde_json::from_str::<EventJson<PresenceEvent>>(&val)
             .unwrap()
             .deserialize()
@@ -174,7 +174,7 @@ impl EventBuilder {
         P: AsRef<Path>,
     {
         let body = fs::read_to_string(path.as_ref())
-            .expect(&format!("file not found {:?}", path.as_ref()));
+            .unwrap_or_else(|_| panic!("file not found {:?}", path.as_ref()));
         let mock = Some(
             mock(method, matcher)
                 .with_status(200)
@@ -367,12 +367,8 @@ impl ClientTestRunner {
         }
 
         for event in &self.room_events {
-            cli.receive_joined_timeline_event(
-                room_id,
-                &mut EventJson::from(event.clone()),
-                &mut false,
-            )
-            .await;
+            cli.receive_joined_timeline_event(room_id, &mut EventJson::from(event), &mut false)
+                .await;
         }
         for event in &self.presence_events {
             cli.receive_presence_event(room_id, event).await;