diff --git a/app/Http/Controllers/Apis/Protected/Summit/OAuth2SummitAttendeesApiController.php b/app/Http/Controllers/Apis/Protected/Summit/OAuth2SummitAttendeesApiController.php
index c5418ef4..904ee8a7 100644
--- a/app/Http/Controllers/Apis/Protected/Summit/OAuth2SummitAttendeesApiController.php
+++ b/app/Http/Controllers/Apis/Protected/Summit/OAuth2SummitAttendeesApiController.php
@@ -509,4 +509,58 @@ final class OAuth2SummitAttendeesApiController extends OAuth2ProtectedController
         }
     }
 
+    /**
+     * @param int $summit_id
+     * @param int $attendee_id
+     * @return mixed
+     */
+    public function updateAttendee($summit_id, $attendee_id){
+        try {
+            if(!Request::isJson()) return $this->error403();
+            $data = Input::json();
+
+            $summit = SummitFinderStrategyFactory::build($this->repository, $this->resource_server_context)->find($summit_id);
+            if (is_null($summit)) return $this->error404();
+
+            $attendee = $this->attendee_repository->getById($attendee_id);
+            if(is_null($attendee)) return $this->error404();
+
+            $rules = [
+                'member_id'                   => 'required|integer',
+                'share_contact_info'          => 'sometimes|boolean',
+                'summit_hall_checked_in'      => 'sometimes|boolean',
+                'summit_hall_checked_in_date' => 'sometimes|date_format:U',
+            ];
+
+            // Creates a Validator instance and validates the data.
+            $validation = Validator::make($data->all(), $rules);
+
+            if ($validation->fails()) {
+                $messages = $validation->messages()->toArray();
+
+                return $this->error412
+                (
+                    $messages
+                );
+            }
+
+            $attendee = $this->attendee_service->updateAttendee($summit, $attendee_id, $data->all());
+
+            return $this->updated(SerializerRegistry::getInstance()->getSerializer($attendee)->serialize());
+        }
+        catch (ValidationException $ex1) {
+            Log::warning($ex1);
+            return $this->error412(array($ex1->getMessage()));
+        }
+        catch(EntityNotFoundException $ex2)
+        {
+            Log::warning($ex2);
+            return $this->error404(array('message'=> $ex2->getMessage()));
+        }
+        catch (Exception $ex) {
+            Log::error($ex);
+            return $this->error500($ex);
+        }
+    }
+
 }
\ No newline at end of file
diff --git a/app/Http/routes.php b/app/Http/routes.php
index 23244b62..cdb41896 100644
--- a/app/Http/routes.php
+++ b/app/Http/routes.php
@@ -159,6 +159,7 @@ Route::group([
                 Route::group(array('prefix' => '{attendee_id}'), function () {
 
                     Route::get('', [ 'middleware' => 'auth.user:administrators|summit-front-end-administrators', 'uses' => 'OAuth2SummitAttendeesApiController@getAttendee']);
+                    Route::put('', [ 'middleware' => 'auth.user:administrators|summit-front-end-administrators', 'uses' => 'OAuth2SummitAttendeesApiController@updateAttendee']);
                     Route::delete('', [ 'middleware' => 'auth.user:administrators|summit-front-end-administrators', 'uses' => 'OAuth2SummitAttendeesApiController@deleteAttendee']);
                     Route::group(array('prefix' => 'schedule'), function ()
                     {
diff --git a/app/Models/Foundation/Summit/Attendees/SummitAttendeeTicket.php b/app/Models/Foundation/Summit/Attendees/SummitAttendeeTicket.php
index 98b55ceb..65122b38 100644
--- a/app/Models/Foundation/Summit/Attendees/SummitAttendeeTicket.php
+++ b/app/Models/Foundation/Summit/Attendees/SummitAttendeeTicket.php
@@ -13,7 +13,6 @@
  **/
 use models\utils\SilverstripeBaseModel;
 use Doctrine\ORM\Mapping AS ORM;
-
 /**
  * @ORM\Entity
  * @ORM\Table(name="SummitAttendeeTicket")
@@ -23,6 +22,44 @@ use Doctrine\ORM\Mapping AS ORM;
  */
 class SummitAttendeeTicket extends SilverstripeBaseModel
 {
+    /**
+     * @ORM\Column(name="ExternalOrderId", type="string")
+     * @var string
+     */
+    private $external_order_id;
+
+    /**
+     * @ORM\Column(name="ExternalAttendeeId", type="string")
+     * @var
+     */
+    private $external_attendee_id;
+
+    /**
+     * @ORM\Column(name="TicketBoughtDate", type="datetime")
+     * @var \DateTime
+     */
+    private $bought_date;
+
+    /**
+     * @ORM\Column(name="TicketChangedDate", type="datetime")
+     * @var \DateTime
+     */
+    private $changed_date;
+
+    /**
+     * @ORM\ManyToOne(targetEntity="SummitTicketType", fetch="EAGER")
+     * @ORM\JoinColumn(name="TicketTypeID", referencedColumnName="ID")
+     * @var SummitTicketType
+     */
+    private $ticket_type;
+
+    /**
+     * @ORM\ManyToOne(targetEntity="SummitAttendee", inversedBy="tickets")
+     * @ORM\JoinColumn(name="OwnerID", referencedColumnName="ID")
+     * @var SummitAttendee
+     */
+    private $owner;
+
     /**
      * @return mixed
      */
@@ -136,44 +173,4 @@ class SummitAttendeeTicket extends SilverstripeBaseModel
     {
         $this->owner = $owner;
     }
-
-    /**
-     * @ORM\Column(name="ExternalOrderId", type="string")
-     * @var string
-     */
-    private $external_order_id;
-
-    /**
-     * @ORM\Column(name="ExternalAttendeeId", type="string")
-     * @var
-     */
-    private $external_attendee_id;
-
-    /**
-     * @ORM\Column(name="TicketBoughtDate", type="datetime")
-     * @var \DateTime
-     */
-    private $bought_date;
-
-    /**
-     * @ORM\Column(name="TicketChangedDate", type="datetime")
-     * @var \DateTime
-     */
-    private $changed_date;
-
-
-    /**
-     * @ORM\ManyToOne(targetEntity="SummitTicketType", fetch="EAGER")
-     * @ORM\JoinColumn(name="TicketTypeID", referencedColumnName="ID")
-     * @var SummitTicketType
-     */
-    private $ticket_type;
-
-    /**
-     * @ORM\ManyToOne(targetEntity="SummitAttendee", inversedBy="tickets")
-     * @ORM\JoinColumn(name="OwnerID", referencedColumnName="ID")
-     * @var SummitAttendee
-     */
-    private $owner;
-
 }
\ No newline at end of file
diff --git a/app/Models/Foundation/Summit/Factories/SummitAttendeeFactory.php b/app/Models/Foundation/Summit/Factories/SummitAttendeeFactory.php
index 44b79bc4..1ea8b72d 100644
--- a/app/Models/Foundation/Summit/Factories/SummitAttendeeFactory.php
+++ b/app/Models/Foundation/Summit/Factories/SummitAttendeeFactory.php
@@ -27,8 +27,17 @@ final class SummitAttendeeFactory
      * @return SummitAttendee
      */
     public static function build(Summit $summit, Member $member, array $data){
-        $attendee = new SummitAttendee();
+        return self::updateMainData($summit, new SummitAttendee, $member, $data);
+    }
 
+    /**
+     * @param Summit $summit
+     * @param SummitAttendee $attendee
+     * @param Member $member
+     * @param array $data
+     * @return SummitAttendee
+     */
+    public static function updateMainData(Summit $summit, SummitAttendee $attendee, Member $member, array $data){
         $attendee->setMember($member);
         $attendee->setSummit($summit);
 
diff --git a/app/Services/Model/AttendeeService.php b/app/Services/Model/AttendeeService.php
index c7f1f606..76b6d4a2 100644
--- a/app/Services/Model/AttendeeService.php
+++ b/app/Services/Model/AttendeeService.php
@@ -96,13 +96,46 @@ final class AttendeeService implements IAttendeeService
     {
         return $this->tx_service->transaction(function() use($summit, $attendee_id){
 
-
             $attendee = $summit->getAttendeeById($attendee_id);
             if(is_null($attendee))
                 throw new EntityNotFoundException();
 
             $this->attendee_repository->delete($attendee);
+        });
+    }
 
+    /**
+     * @param Summit $summit
+     * @param int $attendee_id
+     * @param array $data
+     * @return SummitAttendee
+     * @throws ValidationException
+     * @throws EntityNotFoundException
+     */
+    public function updateAttendee(Summit $summit, $attendee_id, array $data)
+    {
+        return $this->tx_service->transaction(function() use($summit, $attendee_id, $data){
+
+            $attendee = $summit->getAttendeeById($attendee_id);
+            if(is_null($attendee))
+                throw new EntityNotFoundException(sprintf("attendee does not belongs to summit id %s", $summit->getId()));
+
+            if(!isset($data['member_id']))
+                throw new ValidationException("member_id is required");
+
+            $member_id = intval($data['member_id']);
+            $member    = $this->member_repository->getById($member_id);
+
+            if(is_null($member))
+                throw new EntityNotFoundException("member not found");
+
+            // check if attendee already exist for this summit
+
+            $old_attendee = $this->attendee_repository->getBySummitAndMember($summit, $member);
+            if(!is_null($old_attendee) && $old_attendee->getId() != $attendee->getId())
+                throw new ValidationException(sprintf("another attendee (%s) already exist for summit id %s and member id %s", $old_attendee->getId(), $summit->getId(), $member->getIdentifier()));
+
+            return SummitAttendeeFactory::updateMainData($summit, $attendee, $member , $data);
 
         });
     }
diff --git a/app/Services/Model/IAttendeeService.php b/app/Services/Model/IAttendeeService.php
index 527a04b2..bbd9a174 100644
--- a/app/Services/Model/IAttendeeService.php
+++ b/app/Services/Model/IAttendeeService.php
@@ -25,6 +25,8 @@ interface IAttendeeService
      * @param Summit $summit
      * @param array $data
      * @return SummitAttendee
+     * @throws ValidationException
+     * @throws EntityNotFoundException
      */
     public function addAttendee(Summit $summit, array $data);
 
@@ -36,4 +38,14 @@ interface IAttendeeService
      * @throws EntityNotFoundException
      */
     public function deleteAttendee(Summit $summit, $attendee_id);
+
+    /**
+     * @param Summit $summit
+     * @param int $attendee_id
+     * @param array $data
+     * @return SummitAttendee
+     * @throws ValidationException
+     * @throws EntityNotFoundException
+     */
+    public function updateAttendee(Summit $summit, $attendee_id, array $data);
 }
\ No newline at end of file
diff --git a/database/seeds/ApiEndpointsSeeder.php b/database/seeds/ApiEndpointsSeeder.php
index 9a8c97f4..584329ea 100644
--- a/database/seeds/ApiEndpointsSeeder.php
+++ b/database/seeds/ApiEndpointsSeeder.php
@@ -137,6 +137,14 @@ class ApiEndpointsSeeder extends Seeder
                     sprintf(SummitScopes::WriteAttendeesData, $current_realm),
                 ],
             ),
+            array(
+                'name' => 'update-attendee',
+                'route' => '/api/v1/summits/{id}/attendees/{attendee_id}',
+                'http_method' => 'PUT',
+                'scopes' => [
+                    sprintf(SummitScopes::WriteAttendeesData, $current_realm),
+                ],
+            ),
             array(
                 'name' => 'get-attendee-schedule',
                 'route' => '/api/v1/summits/{id}/attendees/{attendee_id}/schedule',
diff --git a/tests/OAuth2AttendeesApiTest.php b/tests/OAuth2AttendeesApiTest.php
index 96e35825..c129c0fd 100644
--- a/tests/OAuth2AttendeesApiTest.php
+++ b/tests/OAuth2AttendeesApiTest.php
@@ -74,11 +74,11 @@ class OAuth2AttendeesApiTest extends ProtectedApiTest
         $this->assertTrue(!is_null($attendee));
     }
 
-    public function testGetAttendeeByID(){
+    public function testGetAttendeeByID($attendee_id = 12641){
 
         $params = [
             'id'          => 23,
-            'attendee_id' => 12641,
+            'attendee_id' => $attendee_id,
             'expand'      => 'member,schedule,tickets,affiliations,groups'
         ];
 
@@ -101,6 +101,8 @@ class OAuth2AttendeesApiTest extends ProtectedApiTest
         $this->assertResponseStatus(200);
         $attendee = json_decode($content);
         $this->assertTrue(!is_null($attendee));
+
+        return $attendee;
     }
 
     public function testGetAttendeeByOrderID(){
@@ -194,4 +196,40 @@ class OAuth2AttendeesApiTest extends ProtectedApiTest
         $content = $response->getContent();
         $this->assertResponseStatus(204);
     }
+
+    public function testUpdateAttendee(){
+        $attendee = $this->testGetAttendeeByID(12642);
+
+        $params = [
+            'id' => 23,
+            'attendee_id' => $attendee->id
+        ];
+
+        $data = [
+            'member_id'          => $attendee->member->id,
+            'share_contact_info' => true
+        ];
+
+        $headers = [
+            "HTTP_Authorization" => " Bearer " . $this->access_token,
+            "CONTENT_TYPE"        => "application/json"
+        ];
+
+        $response = $this->action(
+            "PUT",
+            "OAuth2SummitAttendeesApiController@updateAttendee",
+            $params,
+            [],
+            [],
+            [],
+            $headers,
+            json_encode($data)
+        );
+
+        $content = $response->getContent();
+        $this->assertResponseStatus(204);
+        $attendee = json_decode($content);
+        $this->assertTrue(!is_null($attendee));
+        return $attendee;
+    }
 }
\ No newline at end of file