diff --git a/src/CronExecutor.php b/src/CronExecutor.php
index ca305cc..51f4e02 100644
--- a/src/CronExecutor.php
+++ b/src/CronExecutor.php
@@ -16,7 +16,7 @@ class CronExecutor extends Model
 
     public $table = 'cron';
 
-    public $intervalSettings = [
+    public array $intervalSettings = [
         'YEARLY' => 'Jährlich',
         'MONTHLY' => 'Monatlich',
         'WEEKLY' => 'Wöchentlich',
@@ -25,7 +25,7 @@ class CronExecutor extends Model
         'MINUTELY' => 'Minütlich'
     ];
 
-    public $minutelyIntervalSettings = [
+    public array $minutelyIntervalSettings = [
         'EVERY_MINUTE' => 'Jede Minute',
         'EVERY_FIFTH_MINUTE' => 'Alle 5 Minuten',
         'EVERY_FIFTEENTH_MINUTE' => 'Alle 15 Minuten'
@@ -33,7 +33,7 @@ class CronExecutor extends Model
 
     //path(es) to  folders where  Cronjob php Files are located
     //format: path => namespace, e.g. 'src/data/cron' => 'YourProject\\Data\\Cron',
-    public $cronFilesPath = [];
+    public array $cronFilesPath = [];
 
     public $currentDate;
     public $currentWeekday;
diff --git a/tests/CronExecutorTest.php b/tests/CronExecutorTest.php
index c970923..4c32ddc 100644
--- a/tests/CronExecutorTest.php
+++ b/tests/CronExecutorTest.php
@@ -94,14 +94,14 @@ public function testRunYearly()
     public function testRunMonthly()
     {
         $persistence = $this->getSqliteTestPersistence();
-        $testTime = new \DateTime('2020-05-05');
+        $testTime = new \DateTime('2020-05-07');
         $testTime->setTime(3, 3);
         //this one should be executed
         $cm1 = $this->_getRecord(
             $persistence,
             [
                 'interval' => 'MONTHLY',
-                'day_monthly' => 5,
+                'day_monthly' => 7,
                 'time_monthly' => '03:03',
             ]
         );
@@ -109,7 +109,7 @@ public function testRunMonthly()
             $persistence,
             [
                 'interval' => 'MONTHLY',
-                'day_monthly' => 5,
+                'day_monthly' => 7,
                 'time_monthly' => '03:02',
             ]
         );
@@ -117,7 +117,7 @@ public function testRunMonthly()
             $persistence,
             [
                 'interval' => 'MONTHLY',
-                'day_monthly' => 5,
+                'day_monthly' => 7,
                 'time_monthly' => '03:04',
             ]
         );
@@ -125,7 +125,7 @@ public function testRunMonthly()
             $persistence,
             [
                 'interval' => 'MONTHLY',
-                'day_monthly' => 4,
+                'day_monthly' => 8,
                 'time_monthly' => '03:03',
             ]
         );