diff --git a/lib/Doctrine/ODM/MongoDB/Aggregation/Aggregation.php b/lib/Doctrine/ODM/MongoDB/Aggregation/Aggregation.php
index 32379a82ca..013e7e1bdd 100644
--- a/lib/Doctrine/ODM/MongoDB/Aggregation/Aggregation.php
+++ b/lib/Doctrine/ODM/MongoDB/Aggregation/Aggregation.php
@@ -11,12 +11,10 @@
 use Doctrine\ODM\MongoDB\Iterator\Iterator;
 use Doctrine\ODM\MongoDB\Iterator\UnrewindableIterator;
 use Doctrine\ODM\MongoDB\Mapping\ClassMetadata;
-use Iterator as SPLIterator;
 use MongoDB\Collection;
 use MongoDB\Driver\CursorInterface;
 
 use function array_merge;
-use function assert;
 
 /** @phpstan-import-type PipelineExpression from Builder */
 final class Aggregation implements IterableResult
@@ -56,14 +54,11 @@ public function getIterator(): Iterator
         $options = array_merge($this->options, ['cursor' => true]);
 
         $cursor = $this->collection->aggregate($this->pipeline, $options);
-        // This assertion can be dropped when requiring mongodb/mongodb 1.17.0
-        assert($cursor instanceof CursorInterface);
-        assert($cursor instanceof SPLIterator);
 
         return $this->prepareIterator($cursor);
     }
 
-    private function prepareIterator(CursorInterface&SPLIterator $cursor): Iterator
+    private function prepareIterator(CursorInterface $cursor): Iterator
     {
         if ($this->classMetadata) {
             $cursor = new HydratingIterator($cursor, $this->dm->getUnitOfWork(), $this->classMetadata);
diff --git a/lib/Doctrine/ODM/MongoDB/Persisters/DocumentPersister.php b/lib/Doctrine/ODM/MongoDB/Persisters/DocumentPersister.php
index d46285b987..44cef23070 100644
--- a/lib/Doctrine/ODM/MongoDB/Persisters/DocumentPersister.php
+++ b/lib/Doctrine/ODM/MongoDB/Persisters/DocumentPersister.php
@@ -29,7 +29,6 @@
 use Doctrine\ODM\MongoDB\Utility\CollectionHelper;
 use Doctrine\Persistence\Mapping\MappingException;
 use InvalidArgumentException;
-use Iterator as SplIterator;
 use MongoDB\BSON\ObjectId;
 use MongoDB\Collection;
 use MongoDB\Driver\CursorInterface;
@@ -333,8 +332,8 @@ private function executeUpsert(object $document, array $options): void
             $data  = ['$set' => ['_id' => $criteria['_id']]];
         }
 
+        assert($this->collection instanceof Collection);
         try {
-            assert($this->collection instanceof Collection);
             $this->collection->updateOne($criteria, $data, $options);
 
             return;
@@ -344,7 +343,6 @@ private function executeUpsert(object $document, array $options): void
             }
         }
 
-        assert($this->collection instanceof Collection);
         $this->collection->updateOne($criteria, ['$set' => new stdClass()], $options);
     }
 
@@ -544,8 +542,6 @@ public function loadAll(array $criteria = [], ?array $sort = null, ?int $limit =
         assert($this->collection instanceof Collection);
         $baseCursor = $this->collection->find($criteria, $options);
 
-        assert($baseCursor instanceof CursorInterface && $baseCursor instanceof SplIterator);
-
         return $this->wrapCursor($baseCursor);
     }
 
@@ -592,7 +588,7 @@ private function getShardKeyQuery(object $document): array
     /**
      * Wraps the supplied base cursor in the corresponding ODM class.
      */
-    private function wrapCursor(SplIterator&CursorInterface $baseCursor): Iterator
+    private function wrapCursor(CursorInterface $baseCursor): Iterator
     {
         return new CachingIterator(new HydratingIterator($baseCursor, $this->dm->getUnitOfWork(), $this->class));
     }