diff --git a/geneit_backend/src/controllers/accommodations_reservations_controller.rs b/geneit_backend/src/controllers/accommodations_reservations_controller.rs
index 3159d3a..de15350 100644
--- a/geneit_backend/src/controllers/accommodations_reservations_controller.rs
+++ b/geneit_backend/src/controllers/accommodations_reservations_controller.rs
@@ -2,50 +2,67 @@ use crate::controllers::HttpResult;
 use crate::extractors::accommodation_extractor::FamilyAndAccommodationInPath;
 use crate::extractors::accommodation_reservation_extractor::FamilyAndAccommodationReservationInPath;
 use crate::extractors::family_extractor::FamilyInPath;
-use crate::models::NewAccommodationReservation;
+use crate::models::{Accommodation, AccommodationReservationID, NewAccommodationReservation};
 use crate::services::accommodations_reservations_service;
 use crate::utils::time_utils::time;
 use actix_web::{web, HttpResponse};
 
 #[derive(serde::Deserialize)]
-pub struct CreateReservationQuery {
+pub struct UpdateReservationQuery {
     start: usize,
     end: usize,
 }
 
+impl UpdateReservationQuery {
+    /// Check whether a reservation request is valid or not
+    async fn validate(
+        &self,
+        a: &Accommodation,
+        resa_id: Option<AccommodationReservationID>,
+    ) -> anyhow::Result<Option<&str>> {
+        if !a.open_to_reservations {
+            return Ok(Some(
+                "The accommodation is not open to reservations create / update!",
+            ));
+        }
+
+        if (self.start as i64) < (time() as i64 - 3600 * 24 * 30) {
+            return Ok(Some("Start time is too far in the past!"));
+        }
+
+        if self.start == self.end {
+            return Ok(Some("Start and end time must be different!"));
+        }
+
+        if self.start > self.end {
+            return Ok(Some("End time happens before start time!"));
+        }
+
+        let existing = accommodations_reservations_service::get_reservations_for_time_interval(
+            a.id(),
+            self.start,
+            self.end,
+        )
+        .await?;
+
+        if existing
+            .iter()
+            .any(|r| r.validated != Some(false) && resa_id != Some(r.id()))
+        {
+            return Ok(Some("This reservation is in conflict with another one!"));
+        }
+
+        Ok(None)
+    }
+}
+
 /// Create a reservation
 pub async fn create_reservation(
     a: FamilyAndAccommodationInPath,
-    req: web::Json<CreateReservationQuery>,
+    req: web::Json<UpdateReservationQuery>,
 ) -> HttpResult {
-    if !a.open_to_reservations {
-        return Ok(HttpResponse::ExpectationFailed()
-            .json("The accommodation is not open to reservations!"));
-    }
-
-    if (req.start as i64) < (time() as i64 - 3600 * 24 * 30) {
-        return Ok(HttpResponse::BadRequest().json("Start time is too far in the past!"));
-    }
-
-    if req.start == req.end {
-        return Ok(HttpResponse::BadRequest().json("Start and end time must be different!"));
-    }
-
-    if req.start > req.end {
-        return Ok(HttpResponse::BadRequest().json("End time happens before start time!"));
-    }
-
-    let existing = accommodations_reservations_service::get_reservations_for_time_interval(
-        a.id(),
-        req.start,
-        req.end,
-    )
-    .await?;
-
-    if existing.iter().any(|r| r.validated != Some(false)) {
-        return Ok(
-            HttpResponse::Conflict().json("This reservation is in conflict with another one!")
-        );
+    if let Some(err) = req.validate(&a, None).await? {
+        return Ok(HttpResponse::BadRequest().json(err));
     }
 
     let mut reservation =
@@ -87,6 +104,36 @@ pub async fn get_single(m: FamilyAndAccommodationReservationInPath) -> HttpResul
     Ok(HttpResponse::Ok().json(m.to_reservation()))
 }
 
+/// Update a reservation
+pub async fn update_single(
+    m: FamilyAndAccommodationReservationInPath,
+    req: web::Json<UpdateReservationQuery>,
+) -> HttpResult {
+    if let Some(err) = req.validate(m.as_accommodation(), Some(m.id())).await? {
+        return Ok(HttpResponse::BadRequest().json(err));
+    }
+
+    if m.membership().user_id() != m.user_id() {
+        return Ok(
+            HttpResponse::BadRequest().json("Only the owner of a reservation can change it!")
+        );
+    }
+
+    let need_validation = m.as_accommodation().need_validation;
+
+    let mut reservation = m.to_reservation();
+    reservation.reservation_start = req.start as i64;
+    reservation.reservation_end = req.end as i64;
+
+    if need_validation {
+        reservation.validated = None;
+    }
+
+    accommodations_reservations_service::update(&mut reservation).await?;
+
+    Ok(HttpResponse::Accepted().finish())
+}
+
 /// Delete a reservation
 pub async fn delete(m: FamilyAndAccommodationReservationInPath) -> HttpResult {
     if m.membership().user_id() != m.user_id() {
diff --git a/geneit_backend/src/extractors/accommodation_reservation_extractor.rs b/geneit_backend/src/extractors/accommodation_reservation_extractor.rs
index 483028f..d62d63c 100644
--- a/geneit_backend/src/extractors/accommodation_reservation_extractor.rs
+++ b/geneit_backend/src/extractors/accommodation_reservation_extractor.rs
@@ -60,6 +60,10 @@ impl FamilyAndAccommodationReservationInPath {
         &self.0
     }
 
+    pub fn as_accommodation(&self) -> &Accommodation {
+        &self.1
+    }
+
     pub fn to_accommodation(self) -> Accommodation {
         self.1
     }
diff --git a/geneit_backend/src/main.rs b/geneit_backend/src/main.rs
index f9c0250..5799638 100644
--- a/geneit_backend/src/main.rs
+++ b/geneit_backend/src/main.rs
@@ -244,7 +244,10 @@ async fn main() -> std::io::Result<()> {
                 "/family/{id}/accommodations/reservation/{reservation_id}",
                 web::get().to(accommodations_reservations_controller::get_single),
             )
-            // TODO : update
+            .route(
+                "/family/{id}/accommodations/reservation/{reservation_id}",
+                web::patch().to(accommodations_reservations_controller::update_single),
+            )
             .route(
                 "/family/{id}/accommodations/reservation/{reservation_id}",
                 web::delete().to(accommodations_reservations_controller::delete),
diff --git a/geneit_backend/src/services/accommodations_reservations_service.rs b/geneit_backend/src/services/accommodations_reservations_service.rs
index f3425cc..0cd018b 100644
--- a/geneit_backend/src/services/accommodations_reservations_service.rs
+++ b/geneit_backend/src/services/accommodations_reservations_service.rs
@@ -30,6 +30,8 @@ pub async fn update(r: &mut AccommodationReservation) -> anyhow::Result<()> {
         .set((
             accommodations_reservations::dsl::time_update.eq(r.time_update),
             accommodations_reservations::dsl::validated.eq(r.validated),
+            accommodations_reservations::dsl::reservation_start.eq(r.reservation_start),
+            accommodations_reservations::dsl::reservation_end.eq(r.reservation_end),
         ))
         .execute(conn)
     })?;