diff --git a/NEWS b/NEWS
index 403cd5234..3dbfc6995 100644
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,7 @@
 ------------------
 
 Bug fixes
+ - [core] properly update the last-modified attribute (#4313)
  - [web] prevent deletion of special folders using del key
  - [eas] improved alarms syncing with EAS devices (#4351)
 
diff --git a/SoObjects/Appointments/SOGoAppointmentObject.m b/SoObjects/Appointments/SOGoAppointmentObject.m
index 70efda117..d855a48e3 100644
--- a/SoObjects/Appointments/SOGoAppointmentObject.m
+++ b/SoObjects/Appointments/SOGoAppointmentObject.m
@@ -323,7 +323,8 @@
               [event addToExceptionDates: recurrenceId];
               
               [event increaseSequence];
-              
+              [event setLastModified: [NSCalendarDate calendarDate]];
+
               // We save the updated iCalendar in the database.
               [object saveCalendar: calendar];
             }
@@ -1242,6 +1243,7 @@ inRecurrenceExceptionsForEvent: (iCalEvent *) theEvent
         }
       
       // We save the updated iCalendar in the database.
+      [event setLastModified: [NSCalendarDate calendarDate]];
       error = [eventObject saveCalendar: [event parent]];
     }
       
@@ -1638,7 +1640,8 @@ inRecurrenceExceptionsForEvent: (iCalEvent *) theEvent
                     {
                       [event addToAlarms: alarm];
                     }
-                  
+
+                  [event setLastModified: [NSCalendarDate calendarDate]];
                   ex = [self saveCalendar: [event parent]];
                 }
             }
diff --git a/SoObjects/Appointments/SOGoCalendarComponent.m b/SoObjects/Appointments/SOGoCalendarComponent.m
index e6170227f..7650a4b00 100644
--- a/SoObjects/Appointments/SOGoCalendarComponent.m
+++ b/SoObjects/Appointments/SOGoCalendarComponent.m
@@ -687,6 +687,7 @@
 
 - (NSException *) saveComponent: (iCalRepeatableEntityObject *) newObject
 {
+  [newObject setLastModified: [NSCalendarDate calendarDate]];
   return [self saveCalendar: [newObject parent]];
 }
 
diff --git a/UI/Scheduler/UIxAppointmentActions.m b/UI/Scheduler/UIxAppointmentActions.m
index 8f16ba980..80aa02b75 100644
--- a/UI/Scheduler/UIxAppointmentActions.m
+++ b/UI/Scheduler/UIxAppointmentActions.m
@@ -114,7 +114,6 @@
       if ([event hasRecurrenceRules])
         [event updateRecurrenceRulesUntilDate: end];
 
-      [event setLastModified: [NSCalendarDate calendarDate]];
       ex = [co saveComponent: event  force: forceSave];
 
       // This condition will be executed only if the event is moved from a calendar to another. If destionationCalendar == 0; there is no calendar change