diff --git a/composer.json b/composer.json
index 91002ed8c..ed429e44a 100644
--- a/composer.json
+++ b/composer.json
@@ -21,8 +21,9 @@
     ],
     "require": {
         "php": "^8.1",
-        "nesbot/carbon": "^2.72.1",
-        "ext-calendar": "*"
+        "ext-calendar": "*",
+        "geniusts/hijri-dates": "^1.1",
+        "nesbot/carbon": "^2.72.1"
     },
     "require-dev": {
         "laravel/prompts": "^0.1.15",
diff --git a/src/Countries/Tunisia.php b/src/Countries/Tunisia.php
index d75716236..b64e2a3c6 100644
--- a/src/Countries/Tunisia.php
+++ b/src/Countries/Tunisia.php
@@ -3,8 +3,12 @@
 namespace Spatie\Holidays\Countries;
 
 use Carbon\CarbonImmutable;
+use GeniusTS\HijriDate\Hijri;
+
 class Tunisia extends Country
 {
+    private int $adjustmentDays = 1;
+
     public function countryCode(): string
     {
         return 'tn';
@@ -33,12 +37,26 @@ protected function allHolidays(int $year): array
     protected function variableHolidays(int $year): array
     {
         return [
-            'Eid al-Fitr' => '04-10',
-            'Eid al-Fitr 2' => '04-11',
-            'Eid al-Adha' => '06-16',
-            'Eid al-Adha 2' => '06-17',
-            'Islamic New Year' => '07-07',
-            'Birthday of the Prophet Muhammad' => '09-16'
+            'Islamic new year' => $this->getHijriDateAsGregorian(1, 1, $year + 1),
+            'Birthday of the Prophet Muhammad' =>  $this->getHijriDateAsGregorian(12, 3, $year + 1),
+            'Eid al-Fitr' =>  $this->getHijriDateAsGregorian(1, 10, $year, $this->adjustmentDays),
+            'Eid al-Fitr - 2nd day' =>  $this->getHijriDateAsGregorian(2, 10, $year, $this->adjustmentDays),
+            'Eid al-Adha' =>  $this->getHijriDateAsGregorian(10, 12, $year, $this->adjustmentDays),
+            'Eid al-Adha - 2nd day' =>  $this->getHijriDateAsGregorian(11, 12, $year, $this->adjustmentDays),
         ];
     }
+
+    protected function getHijriDateAsGregorian(
+        int $hijriDay,
+        int $hijriMonth,
+        int $hijriYear,
+        int $adjustmentDays = 0
+    ): CarbonImmutable
+    {
+        $gregorianNewYear = CarbonImmutable::create($hijriYear, 1, 1);
+        $hijriNewYear = Hijri::convertToHijri($gregorianNewYear);
+        $gregorianDate = Hijri::convertToGregorian($hijriDay, $hijriMonth, $hijriNewYear->year);
+        return CarbonImmutable::instance($gregorianDate)->addDays($adjustmentDays);
+    }
+
 }
diff --git a/tests/.pest/snapshots/Countries/TunisiaTest/it_can_calculate_tunisian_holidays.snap b/tests/.pest/snapshots/Countries/TunisiaTest/it_can_calculate_tunisian_holidays.snap
index 50be9b4a1..793636f64 100644
--- a/tests/.pest/snapshots/Countries/TunisiaTest/it_can_calculate_tunisian_holidays.snap
+++ b/tests/.pest/snapshots/Countries/TunisiaTest/it_can_calculate_tunisian_holidays.snap
@@ -16,7 +16,7 @@
         "date": "2024-04-10"
     },
     {
-        "name": "Eid al-Fitr 2",
+        "name": "Eid al-Fitr - 2nd day",
         "date": "2024-04-11"
     },
     {
@@ -25,14 +25,14 @@
     },
     {
         "name": "Eid al-Adha",
-        "date": "2024-06-16"
+        "date": "2024-06-17"
     },
     {
-        "name": "Eid al-Adha 2",
-        "date": "2024-06-17"
+        "name": "Eid al-Adha - 2nd day",
+        "date": "2024-06-18"
     },
     {
-        "name": "Islamic New Year",
+        "name": "Islamic new year",
         "date": "2024-07-07"
     },
     {
@@ -45,7 +45,7 @@
     },
     {
         "name": "Birthday of the Prophet Muhammad",
-        "date": "2024-09-16"
+        "date": "2024-09-15"
     },
     {
         "name": "Evacuation Day",