diff --git a/src/Agenda/Weekly.php b/src/Agenda/Weekly.php
index 6192526..ae4c41b 100644
--- a/src/Agenda/Weekly.php
+++ b/src/Agenda/Weekly.php
@@ -24,7 +24,7 @@ public function addTimePeriod(string $start_time, string $end_time): Weekly
 
     public function addTimePeriods(...$periods): Weekly
     {
-        collect([$periods])->flatten()->each(function ($period) {
+        collect([$periods])->flatten(2)->each(function ($period) {
             $this->addTimePeriod($period[0], $period[1]);
         });
 
diff --git a/src/SLA.php b/src/SLA.php
index 3a27e4c..c2427c5 100644
--- a/src/SLA.php
+++ b/src/SLA.php
@@ -42,7 +42,7 @@ public function __construct(SLASchedule|array $schedules)
     {
         CarbonPeriod::mixin(EnhancedPeriod::class);
 
-        collect([$schedules])->flatten()->each(function ($b) {
+        collect([$schedules])->flatten(2)->each(function ($b) {
             $this->addSchedule($b);
         })->whenEmpty(function () {
             $this->addSchedule(SLASchedule::create());
@@ -58,7 +58,7 @@ public function addBreach(SLABreach $breach): self
 
     public function addBreaches(...$breaches): self
     {
-        collect([$breaches])->flatten()->each(fn ($b) => $this->addBreach($b));
+        collect([$breaches])->flatten(2)->each(fn ($b) => $this->addBreach($b));
 
         return $this;
     }
@@ -86,7 +86,7 @@ public function clearPausePeriods(): self
 
     public function addHolidays($dates): self
     {
-        collect([$dates])->flatten()->each(fn ($d) => $this->addHoliday($d));
+        collect([$dates])->flatten(2)->each(fn ($d) => $this->addHoliday($d));
 
         return $this;
     }