diff --git a/crates/store/src/sqlite_store.rs b/crates/store/src/sqlite_store.rs
index faeb581..07f8ca2 100644
--- a/crates/store/src/sqlite_store.rs
+++ b/crates/store/src/sqlite_store.rs
@@ -67,6 +67,23 @@ impl CalendarStore for SqliteCalendarStore {
         Ok(())
     }
 
+    async fn update_calendar(&mut self, cid: String, calendar: Calendar) -> Result<(), Error> {
+        let result = sqlx::query!(
+            r#"UPDATE calendars SET name = ?, description = ?, owner = ?, "order" = ?, color = ?, timezone = ? WHERE id = ?"#,
+            calendar.name,
+            calendar.description,
+            calendar.owner,
+            calendar.order,
+            calendar.color,
+            calendar.timezone,
+            cid,
+        ).execute(&self.db).await?;
+        if result.rows_affected() == 0 {
+            return Err(Error::NotFound);
+        }
+        Ok(())
+    }
+
     async fn delete_calendar(&mut self, cid: &str) -> Result<(), Error> {
         sqlx::query!("DELETE FROM calendars WHERE id = ?", cid)
             .execute(&self.db)
@@ -97,6 +114,7 @@ impl CalendarStore for SqliteCalendarStore {
     }
 
     async fn upsert_event(&mut self, cid: String, uid: String, ics: String) -> Result<(), Error> {
+        // TODO: This is not actually an upsert
         // Do this extra step to ensure that the input is actually valid
         let _ = Event::from_ics(uid.to_owned(), ics.to_owned())?;
         sqlx::query!(
diff --git a/crates/store/src/store.rs b/crates/store/src/store.rs
index 6436e29..f1e18ad 100644
--- a/crates/store/src/store.rs
+++ b/crates/store/src/store.rs
@@ -8,6 +8,7 @@ use crate::{calendar::Calendar, event::Event};
 pub trait CalendarStore: Send + Sync + 'static {
     async fn get_calendar(&self, id: &str) -> Result<Calendar, Error>;
     async fn get_calendars(&self, owner: &str) -> Result<Vec<Calendar>, Error>;
+    async fn update_calendar(&mut self, cid: String, calendar: Calendar) -> Result<(), Error>;
     async fn insert_calendar(&mut self, cid: String, calendar: Calendar) -> Result<(), Error>;
     async fn delete_calendar(&mut self, cid: &str) -> Result<(), Error>;
 
diff --git a/crates/store/src/toml_store.rs b/crates/store/src/toml_store.rs
index dbeba71..55b79a1 100644
--- a/crates/store/src/toml_store.rs
+++ b/crates/store/src/toml_store.rs
@@ -66,6 +66,15 @@ impl CalendarStore for TomlCalendarStore {
         }
     }
 
+    async fn update_calendar(&mut self, cid: String, calendar: Calendar) -> Result<(), Error> {
+        if let None = self.calendars.remove(&cid) {
+            // No old calendar to update, for consistency reasons throw an error
+            return Err(Error::NotFound);
+        }
+        self.calendars.insert(cid, calendar);
+        Ok(())
+    }
+
     async fn delete_calendar(&mut self, cid: &str) -> Result<(), Error> {
         self.events.remove(cid);
         self.save().await.unwrap();