diff --git a/src/modules/ad/ad.mapper.ts b/src/modules/ad/ad.mapper.ts
index 05daf4e..839ced6 100644
--- a/src/modules/ad/ad.mapper.ts
+++ b/src/modules/ad/ad.mapper.ts
@@ -11,7 +11,9 @@ import {
   AdReadModel,
   AdWriteModel,
   ScheduleItemModel,
+  ScheduleWriteModel,
   WaypointModel,
+  WaypointWriteModel,
 } from './infrastructure/ad.repository';
 import { AdResponseDto } from './interface/dtos/ad.response.dto';
 
@@ -31,9 +33,8 @@ export class AdMapper
     private readonly outputDatetimeTransformer: DateTimeTransformerPort,
   ) {}
 
-  toPersistence = (entity: AdEntity): AdWriteModel => {
+  toPersistence = (entity: AdEntity, update?: boolean): AdWriteModel => {
     const copy = entity.getProps();
-    const now = new Date();
     const record: AdWriteModel = {
       uuid: copy.id,
       userUuid: copy.userId,
@@ -43,50 +44,80 @@ export class AdMapper
       frequency: copy.frequency,
       fromDate: new Date(copy.fromDate),
       toDate: new Date(copy.toDate),
-      schedule: copy.schedule
-        ? {
-            create: copy.schedule.map((scheduleItem: ScheduleItemProps) => ({
-              uuid: v4(),
-              day: scheduleItem.day,
-              time: new Date(
-                1970,
-                0,
-                1,
-                parseInt(scheduleItem.time.split(':')[0]),
-                parseInt(scheduleItem.time.split(':')[1]),
-              ),
-              margin: scheduleItem.margin,
-              createdAt: now,
-              updatedAt: now,
-            })),
-          }
-        : undefined,
+      schedule: this.toScheduleItemWriteModel(copy.schedule, update),
       seatsProposed: copy.seatsProposed as number,
       seatsRequested: copy.seatsRequested as number,
       strict: copy.strict as boolean,
-      waypoints: copy.waypoints
-        ? {
-            create: copy.waypoints.map((waypoint: WaypointProps) => ({
-              uuid: v4(),
-              position: waypoint.position,
-              name: waypoint.address.name,
-              houseNumber: waypoint.address.houseNumber,
-              street: waypoint.address.street,
-              locality: waypoint.address.locality,
-              postalCode: waypoint.address.postalCode,
-              country: waypoint.address.country,
-              lon: waypoint.address.coordinates.lon,
-              lat: waypoint.address.coordinates.lat,
-              createdAt: now,
-              updatedAt: now,
-            })),
-          }
-        : undefined,
+      waypoints: this.toWaypointWriteModel(copy.waypoints, update),
       comment: copy.comment,
     };
     return record;
   };
 
+  toScheduleItemWriteModel = (
+    schedule: ScheduleItemProps[],
+    update?: boolean,
+  ): ScheduleWriteModel | undefined => {
+    if (!schedule) {
+      return undefined;
+    }
+    const now = new Date();
+    const record: ScheduleWriteModel = {
+      create: schedule.map((scheduleItem: ScheduleItemProps) => ({
+        uuid: v4(),
+        day: scheduleItem.day,
+        time: new Date(
+          1970,
+          0,
+          1,
+          parseInt(scheduleItem.time.split(':')[0]),
+          parseInt(scheduleItem.time.split(':')[1]),
+        ),
+        margin: scheduleItem.margin,
+        createdAt: now,
+        updatedAt: now,
+      })),
+    };
+    if (update) {
+      record.deleteMany = {
+        createdAt: { lt: now },
+      };
+    }
+    return record;
+  };
+
+  toWaypointWriteModel = (
+    waypoints: WaypointProps[],
+    update?: boolean,
+  ): WaypointWriteModel | undefined => {
+    if (!waypoints) {
+      return undefined;
+    }
+    const now = new Date();
+    const record: WaypointWriteModel = {
+      create: waypoints.map((waypoint: WaypointProps) => ({
+        uuid: v4(),
+        position: waypoint.position,
+        name: waypoint.address.name,
+        houseNumber: waypoint.address.houseNumber,
+        street: waypoint.address.street,
+        locality: waypoint.address.locality,
+        postalCode: waypoint.address.postalCode,
+        country: waypoint.address.country,
+        lon: waypoint.address.coordinates.lon,
+        lat: waypoint.address.coordinates.lat,
+        createdAt: now,
+        updatedAt: now,
+      })),
+    };
+    if (update) {
+      record.deleteMany = {
+        createdAt: { lt: now },
+      };
+    }
+    return record;
+  };
+
   toDomain = (record: AdReadModel): AdEntity => {
     const entity = new AdEntity({
       id: record.uuid,
diff --git a/src/modules/ad/ad.module.ts b/src/modules/ad/ad.module.ts
index 8f0e1d9..c27a272 100644
--- a/src/modules/ad/ad.module.ts
+++ b/src/modules/ad/ad.module.ts
@@ -14,6 +14,7 @@ import { CreateAdService } from './core/application/commands/create-ad/create-ad
 import { DeleteAdService } from './core/application/commands/delete-ad/delete-ad.service';
 import { DeleteUserAdsService } from './core/application/commands/delete-user-ads/delete-user-ads.service';
 import { InvalidateAdService } from './core/application/commands/invalidate-ad/invalidate-ad.service';
+import { UpdateAdService } from './core/application/commands/update-ad/update-ad.service';
 import { ValidateAdService } from './core/application/commands/validate-ad/validate-ad.service';
 import { PublishMessageWhenAdIsDeletedDomainEventHandler } from './core/application/event-handlers/publish-message-when-ad-deleted.domain-event-handler';
 import { PublishMessageWhenAdIsCreatedDomainEventHandler } from './core/application/event-handlers/publish-message-when-ad-is-created.domain-event-handler';
@@ -58,6 +59,7 @@ const eventHandlers: Provider[] = [
 
 const commandHandlers: Provider[] = [
   CreateAdService,
+  UpdateAdService,
   DeleteAdService,
   DeleteUserAdsService,
   ValidateAdService,
diff --git a/src/modules/ad/core/application/commands/create-ad/create-ad.service.ts b/src/modules/ad/core/application/commands/create-ad/create-ad.service.ts
index 5b3abc3..98a95dc 100644
--- a/src/modules/ad/core/application/commands/create-ad/create-ad.service.ts
+++ b/src/modules/ad/core/application/commands/create-ad/create-ad.service.ts
@@ -13,6 +13,87 @@ import { DateTimeTransformerPort } from '../../ports/datetime-transformer.port';
 import { Waypoint } from '../../types/waypoint';
 import { CreateAdCommand } from './create-ad.command';
 
+export function createPropsFromCommand(
+  command: CreateAdCommand,
+  datetimeTransformer: DateTimeTransformerPort,
+) {
+  return {
+    userId: command.userId,
+    driver: command.driver,
+    passenger: command.passenger,
+    frequency: command.frequency,
+    //TODO Shouldn't that kind of logic be in the domain layer?
+    fromDate: datetimeTransformer.fromDate(
+      {
+        date: command.fromDate,
+        time: command.schedule[0].time,
+        coordinates: {
+          lon: command.waypoints[0].lon,
+          lat: command.waypoints[0].lat,
+        },
+      },
+      command.frequency,
+    ),
+    toDate: datetimeTransformer.toDate(
+      command.toDate,
+      {
+        date: command.fromDate,
+        time: command.schedule[0].time,
+        coordinates: {
+          lon: command.waypoints[0].lon,
+          lat: command.waypoints[0].lat,
+        },
+      },
+      command.frequency,
+    ),
+    schedule: command.schedule.map((scheduleItem: ScheduleItemProps) => ({
+      day: datetimeTransformer.day(
+        scheduleItem.day,
+        {
+          date: command.fromDate,
+          time: scheduleItem.time,
+          coordinates: {
+            lon: command.waypoints[0].lon,
+            lat: command.waypoints[0].lat,
+          },
+        },
+        command.frequency,
+      ),
+      time: datetimeTransformer.time(
+        {
+          date: command.fromDate,
+          time: scheduleItem.time,
+          coordinates: {
+            lon: command.waypoints[0].lon,
+            lat: command.waypoints[0].lat,
+          },
+        },
+        command.frequency,
+      ),
+      margin: scheduleItem.margin,
+    })),
+    seatsProposed: command.seatsProposed ?? 0,
+    seatsRequested: command.seatsRequested ?? 0,
+    strict: command.strict,
+    waypoints: command.waypoints.map((waypoint: Waypoint) => ({
+      position: waypoint.position,
+      address: {
+        name: waypoint.name,
+        houseNumber: waypoint.houseNumber,
+        street: waypoint.street,
+        postalCode: waypoint.postalCode,
+        locality: waypoint.locality,
+        country: waypoint.country,
+        coordinates: {
+          lon: waypoint.lon,
+          lat: waypoint.lat,
+        },
+      },
+    })),
+    comment: command.comment,
+  };
+}
+
 @CommandHandler(CreateAdCommand)
 export class CreateAdService implements ICommandHandler {
   constructor(
@@ -23,80 +104,9 @@ export class CreateAdService implements ICommandHandler {
   ) {}
 
   async execute(command: CreateAdCommand): Promise<AggregateID> {
-    const ad = AdEntity.create({
-      userId: command.userId,
-      driver: command.driver,
-      passenger: command.passenger,
-      frequency: command.frequency,
-      fromDate: this.datetimeTransformer.fromDate(
-        {
-          date: command.fromDate,
-          time: command.schedule[0].time,
-          coordinates: {
-            lon: command.waypoints[0].lon,
-            lat: command.waypoints[0].lat,
-          },
-        },
-        command.frequency,
-      ),
-      toDate: this.datetimeTransformer.toDate(
-        command.toDate,
-        {
-          date: command.fromDate,
-          time: command.schedule[0].time,
-          coordinates: {
-            lon: command.waypoints[0].lon,
-            lat: command.waypoints[0].lat,
-          },
-        },
-        command.frequency,
-      ),
-      schedule: command.schedule.map((scheduleItem: ScheduleItemProps) => ({
-        day: this.datetimeTransformer.day(
-          scheduleItem.day,
-          {
-            date: command.fromDate,
-            time: scheduleItem.time,
-            coordinates: {
-              lon: command.waypoints[0].lon,
-              lat: command.waypoints[0].lat,
-            },
-          },
-          command.frequency,
-        ),
-        time: this.datetimeTransformer.time(
-          {
-            date: command.fromDate,
-            time: scheduleItem.time,
-            coordinates: {
-              lon: command.waypoints[0].lon,
-              lat: command.waypoints[0].lat,
-            },
-          },
-          command.frequency,
-        ),
-        margin: scheduleItem.margin,
-      })),
-      seatsProposed: command.seatsProposed ?? 0,
-      seatsRequested: command.seatsRequested ?? 0,
-      strict: command.strict,
-      waypoints: command.waypoints.map((waypoint: Waypoint) => ({
-        position: waypoint.position,
-        address: {
-          name: waypoint.name,
-          houseNumber: waypoint.houseNumber,
-          street: waypoint.street,
-          postalCode: waypoint.postalCode,
-          locality: waypoint.locality,
-          country: waypoint.country,
-          coordinates: {
-            lon: waypoint.lon,
-            lat: waypoint.lat,
-          },
-        },
-      })),
-      comment: command.comment,
-    });
+    const ad = AdEntity.create(
+      createPropsFromCommand(command, this.datetimeTransformer),
+    );
 
     try {
       await this.repository.insert(ad);
diff --git a/src/modules/ad/core/application/commands/update-ad/update-ad.command.ts b/src/modules/ad/core/application/commands/update-ad/update-ad.command.ts
new file mode 100644
index 0000000..db2dbc3
--- /dev/null
+++ b/src/modules/ad/core/application/commands/update-ad/update-ad.command.ts
@@ -0,0 +1,16 @@
+import { CommandProps } from '@mobicoop/ddd-library';
+import { CreateAdCommand } from '../create-ad/create-ad.command';
+
+/**
+ * Ad updates follow the PUT semantics: they replace the entire object.
+ * Therefore the update command extends the create command to inherit the same properties
+ * and re-use the data transformation logic.
+ */
+export class UpdateAdCommand extends CreateAdCommand {
+  public adId: string;
+
+  constructor(props: CommandProps<UpdateAdCommand>) {
+    super(props);
+    this.adId = props.adId;
+  }
+}
diff --git a/src/modules/ad/core/application/commands/update-ad/update-ad.service.ts b/src/modules/ad/core/application/commands/update-ad/update-ad.service.ts
new file mode 100644
index 0000000..a97d093
--- /dev/null
+++ b/src/modules/ad/core/application/commands/update-ad/update-ad.service.ts
@@ -0,0 +1,29 @@
+import {
+  AD_REPOSITORY,
+  INPUT_DATETIME_TRANSFORMER,
+} from '@modules/ad/ad.di-tokens';
+import { Inject } from '@nestjs/common';
+import { CommandHandler, ICommandHandler } from '@nestjs/cqrs';
+import { AdRepositoryPort } from '../../ports/ad.repository.port';
+import { DateTimeTransformerPort } from '../../ports/datetime-transformer.port';
+import { createPropsFromCommand } from '../create-ad/create-ad.service';
+import { UpdateAdCommand } from './update-ad.command';
+
+@CommandHandler(UpdateAdCommand)
+export class UpdateAdService implements ICommandHandler {
+  constructor(
+    @Inject(AD_REPOSITORY)
+    private readonly repository: AdRepositoryPort,
+    @Inject(INPUT_DATETIME_TRANSFORMER)
+    private readonly datetimeTransformer: DateTimeTransformerPort,
+  ) {}
+
+  async execute(command: UpdateAdCommand): Promise<void> {
+    const ad = await this.repository.findOneById(command.adId, {
+      waypoints: true,
+      schedule: true,
+    });
+    ad.update(createPropsFromCommand(command, this.datetimeTransformer));
+    await this.repository.update(ad.id, ad);
+  }
+}
diff --git a/src/modules/ad/core/application/types/waypoint.ts b/src/modules/ad/core/application/types/waypoint.ts
index 32c5204..57d792e 100644
--- a/src/modules/ad/core/application/types/waypoint.ts
+++ b/src/modules/ad/core/application/types/waypoint.ts
@@ -1,5 +1,6 @@
 import { Address } from './address';
 
+//TODO Why not use the Waypoint value-object from the domain?
 export type Waypoint = {
   position: number;
 } & Address;
diff --git a/src/modules/ad/infrastructure/ad.repository.ts b/src/modules/ad/infrastructure/ad.repository.ts
index b5df96f..fa06d0a 100644
--- a/src/modules/ad/infrastructure/ad.repository.ts
+++ b/src/modules/ad/infrastructure/ad.repository.ts
@@ -1,16 +1,16 @@
-import { Inject, Injectable, Logger } from '@nestjs/common';
-import { EventEmitter2 } from '@nestjs/event-emitter';
-import { AdEntity } from '../core/domain/ad.entity';
-import { AdMapper } from '../ad.mapper';
-import { AdRepositoryPort } from '../core/application/ports/ad.repository.port';
 import {
   LoggerBase,
   MessagePublisherPort,
   PrismaRepositoryBase,
 } from '@mobicoop/ddd-library';
-import { PrismaService } from './prisma.service';
-import { AD_MESSAGE_PUBLISHER } from '../ad.di-tokens';
+import { Inject, Injectable, Logger } from '@nestjs/common';
+import { EventEmitter2 } from '@nestjs/event-emitter';
 import { SERVICE_NAME } from '@src/app.constants';
+import { AD_MESSAGE_PUBLISHER } from '../ad.di-tokens';
+import { AdMapper } from '../ad.mapper';
+import { AdRepositoryPort } from '../core/application/ports/ad.repository.port';
+import { AdEntity } from '../core/domain/ad.entity';
+import { PrismaService } from './prisma.service';
 
 export type AdBaseModel = {
   uuid: string;
@@ -40,13 +40,21 @@ export type AdWriteModel = AdBaseModel & {
 };
 
 export type ScheduleWriteModel = {
+  deleteMany?: PastCreatedFilter;
   create: ScheduleItemModel[];
 };
 
 export type WaypointWriteModel = {
+  deleteMany?: PastCreatedFilter;
   create: WaypointModel[];
 };
 
+// used to delete records created in the past,
+// because the order of `create` and `deleteMany` is not guaranteed
+export type PastCreatedFilter = {
+  createdAt: { lt: Date };
+};
+
 export type ScheduleItemModel = {
   uuid: string;
   day: number;