diff --git a/rector.php b/rector.php
index 99a3024c..9108fc75 100644
--- a/rector.php
+++ b/rector.php
@@ -8,6 +8,7 @@
 use Rector\CodingStyle\Rector\Closure\StaticClosureRector;
 use Rector\CodingStyle\Rector\Encapsed\EncapsedStringsToSprintfRector;
 use Rector\CodingStyle\Rector\If_\NullableCompareToNullRector;
+use Rector\CodingStyle\Rector\PostInc\PostIncDecToPreIncDecRector;
 use Rector\Config\RectorConfig;
 use Rector\Php74\Rector\Closure\ClosureToArrowFunctionRector;
 use Rector\Php81\Rector\FuncCall\NullToStrictStringFuncCallArgRector;
@@ -17,7 +18,7 @@
 return RectorConfig::configure()
     ->withPaths(['src'])
     ->withPhpSets(php81: true)
-    ->withPreparedSets(deadCode: true, typeDeclarations: true)
+    ->withPreparedSets(deadCode: true, codingStyle: true, typeDeclarations: true)
     ->withSkip([
         NullToStrictStringFuncCallArgRector::class,
         ClosureToArrowFunctionRector::class,
@@ -29,4 +30,5 @@
         NullableCompareToNullRector::class,
         EncapsedStringsToSprintfRector::class,
         CatchExceptionNameMatchingTypeRector::class,
+        PostIncDecToPreIncDecRector::class,
     ]);
diff --git a/src/Countries/Bahrain.php b/src/Countries/Bahrain.php
index 6fcf009d..6459a2e8 100644
--- a/src/Countries/Bahrain.php
+++ b/src/Countries/Bahrain.php
@@ -151,7 +151,7 @@ public function defaultLocale(): string
     protected function allHolidays(int $year): array
     {
         return array_merge([
-            'New Year\'s Day' => '1-1',
+            "New Year's Day" => '1-1',
             'Labour Day' => '5-1',
             'National Day' => '12-16',
             'National Day 2' => '12-17',
diff --git a/src/Countries/Benin.php b/src/Countries/Benin.php
index b6a5b9a5..db6f7da3 100644
--- a/src/Countries/Benin.php
+++ b/src/Countries/Benin.php
@@ -309,7 +309,7 @@ protected function getIslamicHolidays(
         $currentYearHolidays = is_array($holidays[$year]) ? $holidays[$year] : [$holidays[$year]];
 
         foreach ($currentYearHolidays as $currentYearHoliday) {
-            $currentYearHoliday = CarbonImmutable::createFromFormat('Y-m-d', "$year-$currentYearHoliday");
+            $currentYearHoliday = CarbonImmutable::createFromFormat('Y-m-d', "{$year}-{$currentYearHoliday}");
 
             $islamicHolidays = array_merge($islamicHolidays, $this->prepareHolidays(
                 holiday: $currentYearHoliday,
diff --git a/src/Countries/Canada.php b/src/Countries/Canada.php
index dd606a43..55236c30 100644
--- a/src/Countries/Canada.php
+++ b/src/Countries/Canada.php
@@ -15,7 +15,7 @@ public function countryCode(): string
     protected function allHolidays(int $year): array
     {
         return array_merge([
-            'New Year\'s Day' => '01-01',
+            "New Year's Day" => '01-01',
             'Canada Day' => '07-01',
             'Civic Holiday' => 'first monday of August',
             'Labour Day' => 'first monday of September',
diff --git a/src/Countries/Ecuador.php b/src/Countries/Ecuador.php
index c3641218..d4a8e956 100644
--- a/src/Countries/Ecuador.php
+++ b/src/Countries/Ecuador.php
@@ -26,7 +26,7 @@ public function defaultLocale(): string
     protected function allHolidays(int $year): array
     {
         return array_merge([
-            'New Year\'s Day' => '01-01',
+            "New Year's Day" => '01-01',
         ], $this->variableHolidays($year));
     }
 
@@ -76,7 +76,7 @@ protected function variableHolidays(int $year): array
             'Battle of Pichincha' => $this->nearestDay($year, 5, 24),
             'Independence Day' => $this->nearestDay($year, 8, 10),
             'Independence Of Guayaquil' => $this->nearestDay($year, 10, 9),
-            'All Souls\' Day' => $this->nearestDay($year, 11, 2),
+            "All Souls' Day" => $this->nearestDay($year, 11, 2),
             'Independence Of Cuenca' => $this->nearestDay($year, 11, 3),
             'Christmas' => $this->getChristmasHoliday($year),
         ];
diff --git a/src/Countries/Egypt.php b/src/Countries/Egypt.php
index bb3e5c74..5b8ceeef 100644
--- a/src/Countries/Egypt.php
+++ b/src/Countries/Egypt.php
@@ -244,7 +244,7 @@ public function defaultLocale(): string
     protected function allHolidays(int $year): array
     {
         return array_merge([
-            'New Year\'s Day' => '1-1',
+            "New Year's Day" => '1-1',
             'Flooding of the Nile' => '8-15',
             'March Equinox' => '3-20',
             'June Solstice' => '6-21',
diff --git a/src/Countries/France.php b/src/Countries/France.php
index 16b61175..f4bf6bf6 100644
--- a/src/Countries/France.php
+++ b/src/Countries/France.php
@@ -19,7 +19,7 @@ public function countryCode(): string
     protected function allHolidays(int $year): array
     {
         return array_merge([
-            'Jour de l\'An' => '01-01',
+            "Jour de l'An" => '01-01',
             'Fête du Travail' => '05-01',
             'Victoire 1945' => '05-08',
             'Fête Nationale' => '07-14',
@@ -55,12 +55,12 @@ protected function regionHolidays(): array
     {
         return match ($this->region) {
             'FR-57', 'FR-67', 'FR-68' => ['Saint-Étienne' => '12-26'],
-            'FR-971', 'FR-MF' => ['Abolition de l\'esclavage' => '05-27'],
-            'FR-972' => ['Abolition de l\'esclavage' => '05-22'],
-            'FR-973' => ['Abolition de l\'esclavage' => '06-10'],
-            'FR-974' => ['Abolition de l\'esclavage' => '12-20'],
-            'FR-976' => ['Abolition de l\'esclavage' => '04-27'],
-            'FR-BL' => ['Abolition de l\'esclavage' => '10-09'],
+            'FR-971', 'FR-MF' => ["Abolition de l'esclavage" => '05-27'],
+            'FR-972' => ["Abolition de l'esclavage" => '05-22'],
+            'FR-973' => ["Abolition de l'esclavage" => '06-10'],
+            'FR-974' => ["Abolition de l'esclavage" => '12-20'],
+            'FR-976' => ["Abolition de l'esclavage" => '04-27'],
+            'FR-BL' => ["Abolition de l'esclavage" => '10-09'],
             default => [],
         };
     }
diff --git a/src/Countries/Germany.php b/src/Countries/Germany.php
index 04fdda15..f87526c5 100644
--- a/src/Countries/Germany.php
+++ b/src/Countries/Germany.php
@@ -105,6 +105,7 @@ protected function regionHolidays(int $year): array
                 if ($year >= 2019) {
                     $beHolidays['Internationaler Frauentag'] = '03-08';
                 }
+
                 if ($year === 2020) {
                     $beHolidays['Tag der Befreiung'] = '05-08';
                 }
@@ -171,6 +172,7 @@ protected function regionHolidays(int $year): array
                     $snHolidays['Reformationstag'] = '10-31';
 
                 }
+
                 if ($year > 1994) {
                     $snHolidays['Buß- und Bettag'] = $this->getRepentanceAndPrayerDay($year);
 
@@ -183,6 +185,7 @@ protected function regionHolidays(int $year): array
                     $stHolidays['Reformationstag'] = '10-31';
 
                 }
+
                 if ($year >= 1991) {
                     $stHolidays['Heilige Drei Könige'] = '01-06';
                 }
@@ -191,6 +194,7 @@ protected function regionHolidays(int $year): array
                 if ($year >= 1990) {
                     $thHolidays['Reformationstag'] = '10-31';
                 }
+
                 if ($year >= 2019) {
                     $thHolidays['Weltkindertag'] = '09-20';
                 }
diff --git a/src/Countries/Ghana.php b/src/Countries/Ghana.php
index 2e9ed2d2..e00a12a4 100644
--- a/src/Countries/Ghana.php
+++ b/src/Countries/Ghana.php
@@ -27,11 +27,11 @@ protected function allHolidays(int $year): array
     protected function observedHolidays(int $year): array
     {
         $holidays = [
-            'New Year\'s Day' => '01-01',
+            "New Year's Day" => '01-01',
             'Constitution Day' => '01-07',
             'Independence Day' => '03-06',
             'May Day' => '05-01',
-            'Founder\'s Day' => '08-04',
+            "Founder's Day" => '08-04',
             'Kwame Nkrumah Memorial Day' => '09-21',
             'Christmas Day' => '12-25',
             'Boxing Day' => '12-26',
diff --git a/src/Countries/Haiti.php b/src/Countries/Haiti.php
index d35ac125..a9ab7f76 100644
--- a/src/Countries/Haiti.php
+++ b/src/Countries/Haiti.php
@@ -18,7 +18,7 @@ protected function allHolidays(int $year): array
             'Jour des Aieux' => '01-2',
             'Fête du Travail / Fête des Travailleurs' => '05-01',
             'Jour du Drapeau et de l\'Université' => '05-18',
-            'L\'Assomption de Marie' => '08-15',
+            "L'Assomption de Marie" => '08-15',
             'Anniversaire de la mort de Dessalines' => '10-17',
             'Toussaint' => '11-01',
             'Jour des Morts' => '11-02',
diff --git a/src/Countries/Ireland.php b/src/Countries/Ireland.php
index 092bfdbd..009cee0f 100644
--- a/src/Countries/Ireland.php
+++ b/src/Countries/Ireland.php
@@ -14,10 +14,10 @@ public function countryCode(): string
     protected function allHolidays(int $year): array
     {
         return array_merge([
-            'New Year\'s Day' => '01-01',
-            'Saint Patrick\'s Day' => '03-17',
+            "New Year's Day" => '01-01',
+            "Saint Patrick's Day" => '03-17',
             'Christmas Day' => '12-25',
-            'Saint Stephen\'s Day' => '12-26',
+            "Saint Stephen's Day" => '12-26',
         ], $this->variableHolidays($year));
     }
 
@@ -33,13 +33,13 @@ protected function variableHolidays(int $year): array
         ];
 
         if ($year >= 2023) {
-            $stBrigidsDay = (new CarbonImmutable("$year-02-01"))->startOfDay();
+            $stBrigidsDay = (new CarbonImmutable("{$year}-02-01"))->startOfDay();
 
             if (! $stBrigidsDay->isFriday()) {
                 $stBrigidsDay = 'first monday of February';
             }
 
-            $variableHolidays['St Brigid\'s Day'] = $stBrigidsDay;
+            $variableHolidays["St Brigid's Day"] = $stBrigidsDay;
         }
 
         return $variableHolidays;
diff --git a/src/Countries/Jamaica.php b/src/Countries/Jamaica.php
index 96472e60..8963d9d6 100644
--- a/src/Countries/Jamaica.php
+++ b/src/Countries/Jamaica.php
@@ -27,7 +27,7 @@ protected function allHolidays(int $year): array
     protected function fixedHolidays(int $year): array
     {
         $holidays = [
-            'New Year\'s Day' => '01-01',
+            "New Year's Day" => '01-01',
             'Labour Day' => '05-23',
             'Emancipation Day' => '08-01',
             'Independence Day' => '08-06',
diff --git a/src/Countries/Mexico.php b/src/Countries/Mexico.php
index 0ca4e61c..45a1b559 100644
--- a/src/Countries/Mexico.php
+++ b/src/Countries/Mexico.php
@@ -25,13 +25,13 @@ protected function allHolidays(int $year): array
     /** @return array<string, CarbonImmutable> */
     protected function variableHolidays(int $year): array
     {
-        $constitutionDay = (new CarbonImmutable("first monday of february $year"))
+        $constitutionDay = (new CarbonImmutable("first monday of february {$year}"))
             ->setTimezone('America/Mexico_City');
 
-        $benitoJuarezBirth = (new CarbonImmutable("third monday of March $year"))
+        $benitoJuarezBirth = (new CarbonImmutable("third monday of March {$year}"))
             ->setTimezone('America/Mexico_City');
 
-        $revolutionDay = (new CarbonImmutable("third monday of november $year"))
+        $revolutionDay = (new CarbonImmutable("third monday of november {$year}"))
             ->setTimezone('America/Mexico_City');
 
         $holidays = [
diff --git a/src/Countries/Montenegro.php b/src/Countries/Montenegro.php
index a8d41397..c75d0747 100644
--- a/src/Countries/Montenegro.php
+++ b/src/Countries/Montenegro.php
@@ -20,7 +20,7 @@ public function defaultLocale(): string
         return 'sr';
     }
 
-    public function allHolidays(int $year): array
+    protected function allHolidays(int $year): array
     {
         // Montenegro has two days off for most holidays
         return array_merge([
diff --git a/src/Countries/Morocco.php b/src/Countries/Morocco.php
index 2b999263..e9c87fcc 100644
--- a/src/Countries/Morocco.php
+++ b/src/Countries/Morocco.php
@@ -24,7 +24,7 @@ public function defaultLocale(): string
     protected function allHolidays(int $year): array
     {
         return array_merge([
-            'New Year\'s Day' => '01-01',
+            "New Year's Day" => '01-01',
             'Proclamation of Independence Day' => '01-11',
             'Amazigh New Year (ⵉⴹ ⵏ ⵢⵉⵏⵏⴰⵢⵔ)' => '01-14',
             'Labour Day' => '05-01',
@@ -78,6 +78,7 @@ protected function variableHolidays(int $year): array
                     throw InvalidYear::yearTooLow(1976);
                 }
             }
+
             // Store the Gregorian date of the Islamic holiday
             $islamicHolidaysOnGregorian[$holidayTitle] = CarbonImmutable::createFromFormat('Y-m-d', sprintf('%s-%s-%s', $GregorianDate['year'], $GregorianDate['month'], $GregorianDate['day']));
         }
@@ -98,8 +99,7 @@ protected function variableHolidays(int $year): array
      */
     private function islamicToGregorian(int $y, int $m, int $d): array
     {
-        $delta = 0;
-        $jd = $this->intPart((11 * $y + 3) / 30) + 354 * $y + 30 * $m - $this->intPart(($m - 1) / 2) + $d + 1948440 - 385 + $delta;
+        $jd = $this->intPart((11 * $y + 3) / 30) + 354 * $y + 30 * $m - $this->intPart(($m - 1) / 2) + $d + 1948440 - 385;
         if ($jd > 2299160) {
             $l = $jd + 68569;
             $n = $this->intPart((4 * $l) / 146097);
diff --git a/src/Countries/NewZealand.php b/src/Countries/NewZealand.php
index 411b9613..b6a66edb 100644
--- a/src/Countries/NewZealand.php
+++ b/src/Countries/NewZealand.php
@@ -28,8 +28,8 @@ protected function observedHolidays(int $year): array
     {
         //https://www.employment.govt.nz/leave-and-holidays/public-holidays/public-holidays-and-anniversary-dates/
         $holidays = [
-            'New Year\'s Day' => '01-01',
-            'Day after New Year\'s Day' => '01-02',
+            "New Year's Day" => '01-01',
+            "Day after New Year's Day" => '01-02',
             'Waitangi Day' => '02-06',
             'ANZAC Day' => '04-25',
             'Christmas Day' => '12-25',
@@ -39,7 +39,7 @@ protected function observedHolidays(int $year): array
         //https://www.employment.govt.nz/leave-and-holidays/public-holidays/public-holidays-falling-on-a-weekend/
         foreach ($holidays as $name => $date) {
             $observedDay = match ($name) {
-                'Day after New Year\'s Day' => $this->secondOfJanuary($year),
+                "Day after New Year's Day" => $this->secondOfJanuary($year),
                 'Christmas Day' => $this->observedChristmasDay($year),
                 'Boxing Day' => $this->observedBoxingDay($year),
                 default => $this->weekendToNextMonday($date, $year),
diff --git a/src/Countries/Nigeria.php b/src/Countries/Nigeria.php
index 7721b0d0..ac3407d3 100644
--- a/src/Countries/Nigeria.php
+++ b/src/Countries/Nigeria.php
@@ -14,8 +14,8 @@ public function countryCode(): string
     protected function allHolidays(int $year): array
     {
         return array_merge([
-            'New Year\'s Day' => '01-01',
-            'Worker\'s Day' => '05-01',
+            "New Year's Day" => '01-01',
+            "Worker's Day" => '05-01',
             'Democracy Day' => '06-12',
             'Independence Day' => '10-01',
             'Christmas Day' => '12-25',
diff --git a/src/Countries/NorthernIreland.php b/src/Countries/NorthernIreland.php
index 0b6a7575..e531b6df 100644
--- a/src/Countries/NorthernIreland.php
+++ b/src/Countries/NorthernIreland.php
@@ -25,9 +25,9 @@ protected function allHolidays(int $year): array
     protected function observedHolidays(int $year): array
     {
         $holidays = [
-            'New Year\'s Day' => '01-01',
-            'St Patrick\'s Day' => '03-17',
-            'Battle of the Boyne (Orangemen\'s Day)' => '07-12',
+            "New Year's Day" => '01-01',
+            "St Patrick's Day" => '03-17',
+            "Battle of the Boyne (Orangemen's Day)" => '07-12',
             'Christmas Day' => '12-25',
             'Boxing Day' => '12-26',
         ];
diff --git a/src/Countries/Philippines.php b/src/Countries/Philippines.php
index c4d193e8..bfbb35ae 100644
--- a/src/Countries/Philippines.php
+++ b/src/Countries/Philippines.php
@@ -14,7 +14,7 @@ public function countryCode(): string
     protected function allHolidays(int $year): array
     {
         return array_merge([
-            'New Year\'s Day' => '01-01',
+            "New Year's Day" => '01-01',
             'Araw ng Kagitingan' => '04-09',
             'Labor Day' => '05-01',
             'Independence Day' => '06-12',
diff --git a/src/Countries/Scotland.php b/src/Countries/Scotland.php
index 662c0ea0..3f4d3a80 100644
--- a/src/Countries/Scotland.php
+++ b/src/Countries/Scotland.php
@@ -26,9 +26,9 @@ protected function allHolidays(int $year): array
     protected function observedHolidays(int $year): array
     {
         $holidays = [
-            'New Year\'s Day' => '01-01',
+            "New Year's Day" => '01-01',
             '2nd January' => '01-02',
-            'St Andrew\'s Day' => '11-30',
+            "St Andrew's Day" => '11-30',
             'Christmas Day' => '12-25',
             'Boxing Day' => '12-26',
         ];
diff --git a/src/Countries/SouthAfrica.php b/src/Countries/SouthAfrica.php
index 81cf7397..c79b46cb 100644
--- a/src/Countries/SouthAfrica.php
+++ b/src/Countries/SouthAfrica.php
@@ -19,12 +19,12 @@ protected function allHolidays(int $year): array
         // https://en.wikipedia.org/wiki/Public_holidays_in_South_Africa
         // https://www.gov.za/about-sa/public-holidays
         $holidays = [
-            'New Year\'s Day' => '01-01',
+            "New Year's Day" => '01-01',
             'Human Rights Day' => '03-21',
             'Freedom Day' => '04-27',
-            'Workers\' Day' => '05-01',
+            "Workers' Day" => '05-01',
             'Youth Day' => '06-16',
-            'National Women\'s Day' => '08-09',
+            "National Women's Day" => '08-09',
             'Heritage Day' => '09-24',
             'Day of Reconciliation' => '12-16',
             'Christmas Day' => '12-25',
diff --git a/src/Countries/Tanzania.php b/src/Countries/Tanzania.php
index 7b318534..793d12ad 100644
--- a/src/Countries/Tanzania.php
+++ b/src/Countries/Tanzania.php
@@ -14,7 +14,7 @@ public function countryCode(): string
     protected function allHolidays(int $year): array
     {
         return array_merge([
-            'New Year\'s Day' => '01-01',
+            "New Year's Day" => '01-01',
             'Labor Day' => '05-01',
             'Saba Saba Day' => '07-07',
             'Farmers Day (Nane Nane Day)' => '08-08',
diff --git a/src/Countries/Tunisia.php b/src/Countries/Tunisia.php
index 38d9f61e..b2c79a9f 100644
--- a/src/Countries/Tunisia.php
+++ b/src/Countries/Tunisia.php
@@ -251,12 +251,12 @@ protected function allHolidays(int $year): array
         }
 
         return array_merge([
-            'New Year\'s Day' => '01-01',
+            "New Year's Day" => '01-01',
             'Independence Day' => '03-20',
-            'Martyrs\' Day' => '04-09',
+            "Martyrs' Day" => '04-09',
             'Labour Day' => '05-01',
             'Republic Day' => '07-25',
-            'Women\'s Day' => '08-13',
+            "Women's Day" => '08-13',
             'Evacuation Day' => '10-15',
         ], $revolutionHoliday, $this->islamicHolidays($year));
     }
diff --git a/src/Countries/Turkmenistan.php b/src/Countries/Turkmenistan.php
index cd207609..f12d6dfa 100644
--- a/src/Countries/Turkmenistan.php
+++ b/src/Countries/Turkmenistan.php
@@ -66,6 +66,7 @@ protected function getHijriYear(int $year, bool $nextYear = false): int
     {
         $formatter = $this->getIslamicFormatter();
         $formatter->setPattern('yyyy');
+
         $dateTime = DateTime::createFromFormat('d/m/Y', '01/01/'.($nextYear ? $year + 1 : $year));
 
         return (int) $formatter->format($dateTime);
diff --git a/src/Countries/UnitedStates.php b/src/Countries/UnitedStates.php
index 9cccfad7..f4c9dc8d 100644
--- a/src/Countries/UnitedStates.php
+++ b/src/Countries/UnitedStates.php
@@ -12,7 +12,7 @@ public function countryCode(): string
     protected function allHolidays(int $year): array
     {
         $holidays = array_merge([
-            'New Year\'s Day' => '01-01',
+            "New Year's Day" => '01-01',
             'Independence Day' => '07-04',
             'Veterans Day' => '11-11',
             'Christmas' => '12-25',
@@ -30,7 +30,7 @@ protected function variableHolidays(): array
     {
         return [
             'Martin Luther King Day' => 'third monday of January',
-            'Presidents\' Day' => 'third monday of February',
+            "Presidents' Day" => 'third monday of February',
             'Memorial Day' => 'last monday of May',
             'Labor Day' => 'first monday of September',
             'Columbus Day' => 'second monday of October',
diff --git a/src/Countries/Uzbekistan.php b/src/Countries/Uzbekistan.php
index ceb3cade..05c10044 100644
--- a/src/Countries/Uzbekistan.php
+++ b/src/Countries/Uzbekistan.php
@@ -143,7 +143,7 @@ protected function allHolidays(int $year): array
         return array_merge([
             'Yangi yil' => '01-01',
             'Xalqaro xotin-qizlar kuni' => '03-08',
-            'Navro\'z' => '03-21',
+            "Navro'z" => '03-21',
             'Xotira va qadrlash kuni' => '05-09',
             'Mustaqillik kuni' => '09-01',
             'Ustoz va murabbiylar kuni' => '10-01',
@@ -162,6 +162,7 @@ protected function variableHolidays(int $year): array
                 $holidays['Ramazon Hayiti'.$prefix] = $holiday;
             }
         }
+
         if (isset(self::sacrificeHolidays[$year])) {
             foreach ((array) self::sacrificeHolidays[$year] as $key => $holiday) {
                 $prefix = $key == 0 ? '' : ' '.($key + 1);
diff --git a/src/Countries/Vietnam.php b/src/Countries/Vietnam.php
index a57ae68a..4e957c2b 100644
--- a/src/Countries/Vietnam.php
+++ b/src/Countries/Vietnam.php
@@ -88,7 +88,7 @@ protected function getTheExtraDayForIndependenceDay(int $year): array
             return [];
         }
 
-        $independenceDay = CarbonImmutable::parse("$year-09-02")->startOfDay();
+        $independenceDay = CarbonImmutable::parse("{$year}-09-02")->startOfDay();
 
         if ($independenceDay->dayOfWeek === CarbonInterface::MONDAY) {
             return ['Ngày Sau Quốc Khánh' => $independenceDay->addDay()];
diff --git a/src/Countries/Wales.php b/src/Countries/Wales.php
index f2ebc861..6f71942b 100644
--- a/src/Countries/Wales.php
+++ b/src/Countries/Wales.php
@@ -30,7 +30,7 @@ protected function allHolidays(int $year): array
     protected function observedHolidays(int $year): array
     {
         $holidays = [
-            'New Year\'s Day' => '01-01',
+            "New Year's Day" => '01-01',
             'Christmas Day' => '12-25',
             'Boxing Day' => '12-26',
         ];
diff --git a/src/Exceptions/InvalidRegion.php b/src/Exceptions/InvalidRegion.php
index d27ed70d..c9742cce 100644
--- a/src/Exceptions/InvalidRegion.php
+++ b/src/Exceptions/InvalidRegion.php
@@ -8,6 +8,6 @@ class InvalidRegion extends RuntimeException
 {
     public static function notFound(string $region): self
     {
-        return new self("Region '$region' is not supported.");
+        return new self("Region '{$region}' is not supported.");
     }
 }