diff --git a/app/Timeslot.php b/app/Timeslot.php
index 74632d3..41e7a5d 100644
--- a/app/Timeslot.php
+++ b/app/Timeslot.php
@@ -35,6 +35,11 @@ class Timeslot extends Model
      */
     protected $hidden = ['pivot', 'calendar'];
 
+    /**
+     * @var array
+     */
+    protected $touches = ['calendar'];
+
     /**
      * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
      */