diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index ed19b24..5043a5a 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -5,11 +5,6 @@
         bootstrap="./tests/bootstrap.php"
         colors="true"
 >
-  <coverage processUncoveredFiles="true">
-    <include>
-      <directory suffix=".php">./src</directory>
-    </include>
-  </coverage>
   <testsuites>
     <testsuite name="pauci/datetime test suite">
       <directory>./tests</directory>
diff --git a/src/DateInterval.php b/src/DateInterval.php
index fe70555..77baba4 100644
--- a/src/DateInterval.php
+++ b/src/DateInterval.php
@@ -19,7 +19,6 @@ public static function fromDateInterval(\DateInterval $dateInterval): static
         $interval->i = $dateInterval->i;
         $interval->s = $dateInterval->s;
         $interval->invert = $dateInterval->invert;
-        $interval->days = $dateInterval->days;
 
         return $interval;
     }
@@ -59,16 +58,19 @@ public static function fromString(string $interval): static
         return new static($interval);
     }
 
+    #[\Override]
     public function __toString(): string
     {
         return $this->toString();
     }
 
+    #[\Override]
     public function jsonSerialize(): string
     {
         return $this->toString();
     }
 
+    #[\Override]
     public function toString(): string
     {
         $datePart = '';
diff --git a/src/DateTime.php b/src/DateTime.php
index c3f536d..516c7f5 100644
--- a/src/DateTime.php
+++ b/src/DateTime.php
@@ -130,7 +130,7 @@ public function sub(\DateInterval $interval): static
     }
 
     #[\Override]
-    public function modify(string $modifier): static|false
+    public function modify(string $modifier): static
     {
         return parent::modify($modifier);
     }
diff --git a/src/SystemClock.php b/src/SystemClock.php
index 1f99ed7..d17a428 100644
--- a/src/SystemClock.php
+++ b/src/SystemClock.php
@@ -6,6 +6,7 @@
 
 class SystemClock implements ClockInterface
 {
+    #[\Override]
     public function now(): DateTime
     {
         return new DateTime();
diff --git a/tests/src/DateIntervalTest.php b/tests/src/DateIntervalTest.php
index 5dbd61f..7590c87 100644
--- a/tests/src/DateIntervalTest.php
+++ b/tests/src/DateIntervalTest.php
@@ -5,6 +5,7 @@
 namespace Pauci\DateTime\Test;
 
 use Pauci\DateTime\DateInterval;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 final class DateIntervalTest extends TestCase
@@ -28,9 +29,9 @@ public static function dateIntervalStrings(): array
     }
 
     /**
-     * @dataProvider dateIntervalStrings
      * @param list<int> $parts
      */
+    #[DataProvider('dateIntervalStrings')]
     public function testFromDateInterval(string $intervalSpec, array $parts): void
     {
         $interval = DateInterval::fromDateInterval(new \DateInterval($intervalSpec));
@@ -62,9 +63,9 @@ public function testFromDateIntervalBetweenWinterAndDst(): void
     }
 
     /**
-     * @dataProvider dateIntervalStrings
      * @param list<int> $parts
      */
+    #[DataProvider('dateIntervalStrings')]
     public function testFromString(string $intervalSpec, array $parts): void
     {
         $interval = DateInterval::fromString($intervalSpec);
@@ -78,9 +79,9 @@ public function testFromString(string $intervalSpec, array $parts): void
     }
 
     /**
-     * @dataProvider dateIntervalStrings
      * @param list<int> $parts
      */
+    #[DataProvider('dateIntervalStrings')]
     public function testToString(string $intervalSpec, array $parts): void
     {
         $interval = DateInterval::fromParts($parts[0], $parts[1], $parts[2], $parts[3], $parts[4], $parts[5]);
@@ -89,9 +90,9 @@ public function testToString(string $intervalSpec, array $parts): void
     }
 
     /**
-     * @dataProvider dateIntervalStrings
      * @param list<int> $parts
      */
+    #[DataProvider('dateIntervalStrings')]
     public function testJsonEncode(string $intervalSpec, array $parts): void
     {
         $interval = DateInterval::fromParts($parts[0], $parts[1], $parts[2], $parts[3], $parts[4], $parts[5]);