diff --git a/.github/workflows/UnitTests.yml b/.github/workflows/UnitTests.yml
index a172a0a24..88922d3ad 100644
--- a/.github/workflows/UnitTests.yml
+++ b/.github/workflows/UnitTests.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php: ['8.2', '8.3']
+        php: ['8.2', '8.3', '8.4']
 
     steps:
       - uses: actions/checkout@v3
diff --git a/Tests/Unit/Service/CalendarServiceTest.php b/Tests/Unit/Service/CalendarServiceTest.php
index 45119c459..470d4abc1 100644
--- a/Tests/Unit/Service/CalendarServiceTest.php
+++ b/Tests/Unit/Service/CalendarServiceTest.php
@@ -243,26 +243,51 @@ public function getDateConfigReturnsExpectedValues(int $month, int $year, string
         self::assertEquals($expected, $result);
     }
 
-    #[Test]
-    public function getWeekConfigReturnsExpectedValue(): void
+    public static function weekConfigDataProvider(): array
     {
-        $firstDayOfWeek = DateTime::createFromFormat('d.m.Y', '3.1.2022')->setTime(0, 0);
-
-        $expected = [
-            'previous' => [
-                'weeknumber' => 52,
-                'year' => 2021,
-            ],
-            'current' => [
-                'weeknumber' => 1,
-                'year' => 2022,
+        return [
+            '3.1.2022' => [
+                '3.1.2022',
+                [
+                    'previous' => [
+                        'weeknumber' => 52,
+                        'year' => 2021,
+                    ],
+                    'current' => [
+                        'weeknumber' => 1,
+                        'year' => 2022,
+                    ],
+                    'next' => [
+                        'weeknumber' => 2,
+                        'year' => 2022,
+                    ],
+                ]
             ],
-            'next' => [
-                'weeknumber' => 2,
-                'year' => 2022,
+            '30.12.2024' => [
+                '30.12.2024',
+                [
+                    'previous' => [
+                        'weeknumber' => 52,
+                        'year' => 2024,
+                    ],
+                    'current' => [
+                        'weeknumber' => 1,
+                        'year' => 2025,
+                    ],
+                    'next' => [
+                        'weeknumber' => 2,
+                        'year' => 2025,
+                    ],
+                ]
             ],
         ];
+    }
 
+    #[DataProvider('weekConfigDataProvider')]
+    #[Test]
+    public function getWeekConfigReturnsExpectedValue(string $date, array $expected): void
+    {
+        $firstDayOfWeek = DateTime::createFromFormat('d.m.Y', $date)->setTime(0, 0);
         self::assertEquals($expected, $this->subject->getWeekConfig($firstDayOfWeek));
     }
 }