diff --git a/crates/store/src/event.rs b/crates/store/src/event.rs
index e6847e9..3fb9339 100644
--- a/crates/store/src/event.rs
+++ b/crates/store/src/event.rs
@@ -82,7 +82,7 @@ impl Event {
 
     pub fn get_first_occurence(&self) -> Result<NaiveDateTime> {
         // This is safe since we enforce the event's existance in the constructor
-        let event = self.cal.events.get(0).unwrap();
+        let event = self.cal.events.first().unwrap();
         let dtstart = event
             .get_property("DTSTART")
             .ok_or(anyhow!("DTSTART property missing!"))?
@@ -94,7 +94,7 @@ impl Event {
 
     pub fn get_last_occurence(&self) -> Result<NaiveDateTime> {
         // This is safe since we enforce the event's existance in the constructor
-        let event = self.cal.events.get(0).unwrap();
+        let event = self.cal.events.first().unwrap();
 
         if event.get_property("RRULE").is_some() {
             // TODO: understand recurrence rules
diff --git a/crates/store/src/timestamps.rs b/crates/store/src/timestamps.rs
index 138fb53..b232e7a 100644
--- a/crates/store/src/timestamps.rs
+++ b/crates/store/src/timestamps.rs
@@ -12,19 +12,19 @@ pub fn parse_duration(string: &str) -> Result<Duration> {
 
     let mut duration = Duration::zero();
     if let Some(weeks) = captures.name("W") {
-        duration = duration + Duration::weeks(weeks.as_str().parse()?);
+        duration += Duration::weeks(weeks.as_str().parse()?);
     }
     if let Some(days) = captures.name("D") {
-        duration = duration + Duration::days(days.as_str().parse()?);
+        duration += Duration::days(days.as_str().parse()?);
     }
     if let Some(hours) = captures.name("H") {
-        duration = duration + Duration::hours(hours.as_str().parse()?);
+        duration += Duration::hours(hours.as_str().parse()?);
     }
     if let Some(minutes) = captures.name("M") {
-        duration = duration + Duration::minutes(minutes.as_str().parse()?);
+        duration += Duration::minutes(minutes.as_str().parse()?);
     }
     if let Some(seconds) = captures.name("S") {
-        duration = duration + Duration::seconds(seconds.as_str().parse()?);
+        duration += Duration::seconds(seconds.as_str().parse()?);
     }
     if let Some(sign) = captures.name("sign") {
         if sign.as_str() == "-" {
diff --git a/crates/store/src/toml_store.rs b/crates/store/src/toml_store.rs
index f2a3d54..d5b24d9 100644
--- a/crates/store/src/toml_store.rs
+++ b/crates/store/src/toml_store.rs
@@ -80,7 +80,7 @@ impl CalendarStore for TomlCalendarStore {
     }
 
     async fn upsert_event(&mut self, cid: String, uid: String, ics: String) -> Result<()> {
-        let events = self.events.entry(cid).or_insert(HashMap::new());
+        let events = self.events.entry(cid).or_default();
         events.insert(uid.clone(), Event::from_ics(uid, ics)?);
         self.save().await.unwrap();
         Ok(())