diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index fe7ea1b..165fa4e 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -41,7 +41,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: [7.2, 7.3, 7.4, 8.0, 8.1, 8.2, 8.3]
+        php: [7.2, 7.3, 7.4, 8.0, 8.1, 8.2, 8.3, 8.4]
 
     steps:
       - name: Checkout
diff --git a/phpstan.neon b/phpstan.neon
index bea9cb0..2e67762 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -1,5 +1,4 @@
 parameters:
-    checkMissingIterableValueType: false
 
     ignoreErrors:
         - '#Call to an undefined method DateTimeInterface::add\(\)#'
@@ -8,6 +7,7 @@ parameters:
         - '#Call to an undefined method DateTimeInterface::setTime\(\)#'
         - '#Call to an undefined method DateTimeInterface::setTimezone\(\)#'
         - '#Call to an undefined method DateTimeInterface::sub\(\)#'
+        - identifier: missingType.iterableValue
 
     level: max
 
diff --git a/src/Cron/AbstractField.php b/src/Cron/AbstractField.php
index df2848d..58ebde1 100644
--- a/src/Cron/AbstractField.php
+++ b/src/Cron/AbstractField.php
@@ -139,6 +139,8 @@ public function isInIncrementsOfRanges(int $dateValue, string $value): bool
             return false;
         }
 
+        $step = (int)$step;
+
         // Expand the * to a full range
         if ('*' === $range) {
             $range = $this->rangeStart . '-' . $this->rangeEnd;
@@ -217,6 +219,7 @@ public function getRangeForExpression(string $expression, int $max): array
                 $offset = $range[0];
                 $to = $range[1] ?? $max;
             }
+            $stepSize = (int)$stepSize;
             $offset = '*' === $offset ? $this->rangeStart : $offset;
             if ($stepSize >= $this->rangeEnd) {
                 $values = [$this->fullRange[$stepSize % \count($this->fullRange)]];
diff --git a/src/Cron/DayOfWeekField.php b/src/Cron/DayOfWeekField.php
index b9bbf48..e26306e 100644
--- a/src/Cron/DayOfWeekField.php
+++ b/src/Cron/DayOfWeekField.php
@@ -69,7 +69,7 @@ public function isSatisfiedBy(DateTimeInterface $date, $value, bool $invert): bo
 
         // Find out if this is the last specific weekday of the month
         if ($lPosition = strpos($value, 'L')) {
-            $weekday = $this->convertLiterals(substr($value, 0, $lPosition));
+            $weekday = (int)$this->convertLiterals(substr($value, 0, $lPosition));
             $weekday %= 7;
 
             $daysInMonth = (int) $date->format('t');