diff --git a/src/Yasumi/Provider/Bulgaria.php b/src/Yasumi/Provider/Bulgaria.php
index 1239db36b..cfe96b515 100644
--- a/src/Yasumi/Provider/Bulgaria.php
+++ b/src/Yasumi/Provider/Bulgaria.php
@@ -32,7 +32,8 @@ public function initialize(): void
 
         // // Add common holidays
         $this->addHoliday($this->newYearsDay($this->year, $this->timezone, $this->locale));
-        // $this->addHoliday($this->internationalWorkersDay($this->year, $this->timezone, $this->locale));
+        $this->addHoliday($this->internationalWorkersDay($this->year, $this->timezone, $this->locale));
+
         //
         // // Add Catholic holidays
         // $this->addHoliday($this->easter($this->year, $this->timezone, $this->locale));
diff --git a/src/Yasumi/data/translations/internationalWorkersDay.php b/src/Yasumi/data/translations/internationalWorkersDay.php
index d9119c3d4..6120e88cb 100644
--- a/src/Yasumi/data/translations/internationalWorkersDay.php
+++ b/src/Yasumi/data/translations/internationalWorkersDay.php
@@ -17,6 +17,7 @@
 
 // Translations for International Workers' Day
 return [
+    'bg' => 'Ден на труда и на международната работническа солидарност',
     'bs_Latn' => 'Praznik rada',
     'ca' => 'Dia del Treball',
     'cs' => 'Svátek práce',
diff --git a/tests/Bulgaria/BulgariaTest.php b/tests/Bulgaria/BulgariaTest.php
index 6c0740c73..4ffdb24dd 100644
--- a/tests/Bulgaria/BulgariaTest.php
+++ b/tests/Bulgaria/BulgariaTest.php
@@ -33,6 +33,7 @@ public function testOfficialHolidays(): void
     {
         $holidays = [
             'newYearsDay',
+            'internationalWorkersDay',
         ];
 
         if ($this->year >= 1990) {
diff --git a/tests/Bulgaria/InternationalWorkersDayTest.php b/tests/Bulgaria/InternationalWorkersDayTest.php
new file mode 100644
index 000000000..dde9d0265
--- /dev/null
+++ b/tests/Bulgaria/InternationalWorkersDayTest.php
@@ -0,0 +1,57 @@
+<?php
+
+declare(strict_types = 1);
+
+/**
+ * This file is part of the 'Yasumi' package.
+ *
+ * The easy PHP Library for calculating holidays.
+ *
+ * Copyright (c) 2015 - 2024 AzuyaLabs
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @author Sacha Telgenhof <me at sachatelgenhof dot com>
+ */
+
+namespace Yasumi\tests\Bulgaria;
+
+use Yasumi\Holiday;
+use Yasumi\tests\HolidayTestCase;
+
+class InternationalWorkersDayTest extends BulgariaBaseTestCase implements HolidayTestCase
+{
+    public const HOLIDAY = 'internationalWorkersDay';
+
+    public function testHoliday(): void
+    {
+        $year = $this->generateRandomYear();
+        $this->assertHoliday(
+            self::REGION,
+            self::HOLIDAY,
+            $year,
+            new \DateTime("{$year}-05-01", new \DateTimeZone(self::TIMEZONE))
+        );
+    }
+
+    public function testTranslation(): void
+    {
+        $this->assertTranslatedHolidayName(
+            self::REGION,
+            self::HOLIDAY,
+            $this->generateRandomYear(),
+            [self::LOCALE => 'Ден на труда и на международната работническа солидарност']
+        );
+    }
+
+    public function testHolidayType(): void
+    {
+        $this->assertHolidayType(
+            self::REGION,
+            self::HOLIDAY,
+            $this->generateRandomYear(),
+            Holiday::TYPE_OFFICIAL
+        );
+    }
+}
diff --git a/tests/Bulgaria/LiberationDayTest.php b/tests/Bulgaria/LiberationDayTest.php
index 341dbcb6c..423dc59a6 100644
--- a/tests/Bulgaria/LiberationDayTest.php
+++ b/tests/Bulgaria/LiberationDayTest.php
@@ -28,7 +28,7 @@ class LiberationDayTest extends BulgariaBaseTestCase implements HolidayTestCase
 
     public function testHoliday(): void
     {
-        $year = self::ESTABLISHMENT_YEAR;
+        $year = $this->generateRandomYear(self::ESTABLISHMENT_YEAR);
         $this->assertHoliday(
             self::REGION,
             self::HOLIDAY,
@@ -39,15 +39,11 @@ public function testHoliday(): void
 
     public function testNotHoliday(): void
     {
-        $this->assertNotHoliday(self::REGION, self::HOLIDAY, self::ESTABLISHMENT_YEAR - 1);
-    }
-
-    /**
-     * @return array<array<int, \DateTime>>
-     */
-    public function HolidayDataProvider(): array
-    {
-        return $this->generateRandomDates(3, 3, self::TIMEZONE, null, 2000);
+        $this->assertNotHoliday(
+            self::REGION,
+            self::HOLIDAY,
+            $this->generateRandomYear(1000, self::ESTABLISHMENT_YEAR - 1)
+        );
     }
 
     public function testTranslation(): void
@@ -62,6 +58,11 @@ public function testTranslation(): void
 
     public function testHolidayType(): void
     {
-        $this->assertHolidayType(self::REGION, self::HOLIDAY, $this->generateRandomYear(self::ESTABLISHMENT_YEAR), Holiday::TYPE_OFFICIAL);
+        $this->assertHolidayType(
+            self::REGION,
+            self::HOLIDAY,
+            $this->generateRandomYear(self::ESTABLISHMENT_YEAR),
+            Holiday::TYPE_OFFICIAL
+        );
     }
 }
diff --git a/tests/Bulgaria/NewYearsDayTest.php b/tests/Bulgaria/NewYearsDayTest.php
index 1e08f9a35..f964ae214 100644
--- a/tests/Bulgaria/NewYearsDayTest.php
+++ b/tests/Bulgaria/NewYearsDayTest.php
@@ -24,20 +24,15 @@ class NewYearsDayTest extends BulgariaBaseTestCase implements HolidayTestCase
 {
     public const HOLIDAY = 'newYearsDay';
 
-    /**
-     * @dataProvider HolidayDataProvider
-     */
-    public function testHoliday(int $year, \DateTime $expected): void
+    public function testHoliday(): void
     {
-        $this->assertHoliday(self::REGION, self::HOLIDAY, $year, $expected);
-    }
-
-    /**
-     * @return array<array<int, \DateTime>>
-     */
-    public function HolidayDataProvider(): array
-    {
-        return $this->generateRandomDates(1, 1, self::TIMEZONE);
+        $year = $this->generateRandomYear();
+        $this->assertHoliday(
+            self::REGION,
+            self::HOLIDAY,
+            $year,
+            new \DateTime("{$year}-01-01", new \DateTimeZone(self::TIMEZONE))
+        );
     }
 
     public function testTranslation(): void
@@ -52,6 +47,11 @@ public function testTranslation(): void
 
     public function testHolidayType(): void
     {
-        $this->assertHolidayType(self::REGION, self::HOLIDAY, $this->generateRandomYear(), Holiday::TYPE_OFFICIAL);
+        $this->assertHolidayType(
+            self::REGION,
+            self::HOLIDAY,
+            $this->generateRandomYear(),
+            Holiday::TYPE_OFFICIAL
+        );
     }
 }