diff --git a/rules-tests/TypedCollections/Rector/ClassMethod/NarrowReturnUnionToCollectionRector/Fixture/array_and_collection.php.inc b/rules-tests/TypedCollections/Rector/ClassMethod/NarrowReturnUnionToCollectionRector/Fixture/array_and_collection.php.inc
index 5216211b..28d67c59 100644
--- a/rules-tests/TypedCollections/Rector/ClassMethod/NarrowReturnUnionToCollectionRector/Fixture/array_and_collection.php.inc
+++ b/rules-tests/TypedCollections/Rector/ClassMethod/NarrowReturnUnionToCollectionRector/Fixture/array_and_collection.php.inc
@@ -11,7 +11,6 @@ final class ArrayAndCollection
      */
     public function someMethod()
     {
-
     }
 }
 
@@ -30,7 +29,6 @@ final class ArrayAndCollection
      */
     public function someMethod()
     {
-
     }
 }
 
diff --git a/rules-tests/TypedCollections/Rector/ClassMethod/NarrowReturnUnionToCollectionRector/Fixture/nullable_union_collection.php.inc b/rules-tests/TypedCollections/Rector/ClassMethod/NarrowReturnUnionToCollectionRector/Fixture/nullable_union_collection.php.inc
new file mode 100644
index 00000000..51910661
--- /dev/null
+++ b/rules-tests/TypedCollections/Rector/ClassMethod/NarrowReturnUnionToCollectionRector/Fixture/nullable_union_collection.php.inc
@@ -0,0 +1,37 @@
+<?php
+
+namespace Rector\Doctrine\Tests\TypedCollections\Rector\ClassMethod\NarrowReturnUnionToCollectionRector\Fixture;
+
+use Doctrine\Common\Collections\Collection;
+use Rector\Doctrine\Tests\TypedCollections\Rector\ClassMethod\NarrowParamUnionToCollectionRector\Source\AnyEntity;
+
+final class NullableUnionCollection
+{
+    /**
+     * @return Collection<int, AnyEntity>
+     */
+    public function someMethod(): Collection|null
+    {
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Doctrine\Tests\TypedCollections\Rector\ClassMethod\NarrowReturnUnionToCollectionRector\Fixture;
+
+use Doctrine\Common\Collections\Collection;
+use Rector\Doctrine\Tests\TypedCollections\Rector\ClassMethod\NarrowParamUnionToCollectionRector\Source\AnyEntity;
+
+final class NullableUnionCollection
+{
+    /**
+     * @return Collection<int, AnyEntity>
+     */
+    public function someMethod(): Collection
+    {
+    }
+}
+
+?>
diff --git a/rules-tests/TypedCollections/Rector/ClassMethod/NarrowReturnUnionToCollectionRector/Fixture/return_non_nullable_collection.php.inc b/rules-tests/TypedCollections/Rector/ClassMethod/NarrowReturnUnionToCollectionRector/Fixture/return_non_nullable_collection.php.inc
new file mode 100644
index 00000000..4c6cbce0
--- /dev/null
+++ b/rules-tests/TypedCollections/Rector/ClassMethod/NarrowReturnUnionToCollectionRector/Fixture/return_non_nullable_collection.php.inc
@@ -0,0 +1,37 @@
+<?php
+
+namespace Rector\Doctrine\Tests\TypedCollections\Rector\ClassMethod\NarrowReturnUnionToCollectionRector\Fixture;
+
+use Doctrine\Common\Collections\Collection;
+use Rector\Doctrine\Tests\TypedCollections\Rector\ClassMethod\NarrowParamUnionToCollectionRector\Source\AnyEntity;
+
+final class ReturnNonNullableCollection
+{
+    /**
+     * @return Collection<int, AnyEntity>
+     */
+    public function someMethod(): ?Collection
+    {
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Doctrine\Tests\TypedCollections\Rector\ClassMethod\NarrowReturnUnionToCollectionRector\Fixture;
+
+use Doctrine\Common\Collections\Collection;
+use Rector\Doctrine\Tests\TypedCollections\Rector\ClassMethod\NarrowParamUnionToCollectionRector\Source\AnyEntity;
+
+final class ReturnNonNullableCollection
+{
+    /**
+     * @return Collection<int, AnyEntity>
+     */
+    public function someMethod(): Collection
+    {
+    }
+}
+
+?>
diff --git a/rules-tests/TypedCollections/Rector/FuncCall/ArrayMapOnCollectionToArrayRector/Fixture/array_filter_to_array.php.inc b/rules-tests/TypedCollections/Rector/FuncCall/ArrayMapOnCollectionToArrayRector/Fixture/array_filter_to_array.php.inc
new file mode 100644
index 00000000..1c44236e
--- /dev/null
+++ b/rules-tests/TypedCollections/Rector/FuncCall/ArrayMapOnCollectionToArrayRector/Fixture/array_filter_to_array.php.inc
@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Doctrine\Tests\TypedCollections\Rector\FuncCall\ArrayMapOnCollectionToArrayRector\Fixture;
+
+use Doctrine\Common\Collections\Collection;
+
+final class ArrayFilterToArray
+{
+    /**
+     * @var Collection<int, string>
+     */
+    public $items;
+
+    public function merge()
+    {
+        $items = $this->items;
+
+        return array_filter($items, fn ($item) => $item);
+    }
+}
+
+?>
+-----
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Doctrine\Tests\TypedCollections\Rector\FuncCall\ArrayMapOnCollectionToArrayRector\Fixture;
+
+use Doctrine\Common\Collections\Collection;
+
+final class ArrayFilterToArray
+{
+    /**
+     * @var Collection<int, string>
+     */
+    public $items;
+
+    public function merge()
+    {
+        $items = $this->items;
+
+        return array_filter($items->toArray(), fn ($item) => $item);
+    }
+}
+
+?>
diff --git a/rules-tests/TypedCollections/Rector/FuncCall/ArrayMapOnCollectionToArrayRector/Fixture/skip_non_collection.php.inc b/rules-tests/TypedCollections/Rector/FuncCall/ArrayMapOnCollectionToArrayRector/Fixture/skip_non_collection.php.inc
new file mode 100644
index 00000000..355b89ff
--- /dev/null
+++ b/rules-tests/TypedCollections/Rector/FuncCall/ArrayMapOnCollectionToArrayRector/Fixture/skip_non_collection.php.inc
@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Doctrine\Tests\TypedCollections\Rector\FuncCall\ArrayMapOnCollectionToArrayRector\Fixture;
+
+final class SkipNonCollection
+{
+    /**
+     * @var array<int, string>
+     */
+    public $items;
+
+    public function merge()
+    {
+        $items = $this->items;
+
+        return array_filter($items, fn ($item) => $item);
+    }
+}
diff --git a/rules/TypedCollections/Rector/ClassMethod/NarrowReturnUnionToCollectionRector.php b/rules/TypedCollections/Rector/ClassMethod/NarrowReturnUnionToCollectionRector.php
index 71878680..0633b3b7 100644
--- a/rules/TypedCollections/Rector/ClassMethod/NarrowReturnUnionToCollectionRector.php
+++ b/rules/TypedCollections/Rector/ClassMethod/NarrowReturnUnionToCollectionRector.php
@@ -5,8 +5,11 @@
 namespace Rector\Doctrine\TypedCollections\Rector\ClassMethod;
 
 use PhpParser\Node;
+use PhpParser\Node\NullableType;
 use PhpParser\Node\Stmt\ClassMethod;
+use PhpParser\Node\UnionType;
 use PHPStan\PhpDocParser\Ast\PhpDoc\ReturnTagValueNode;
+use Rector\BetterPhpDocParser\PhpDocInfo\PhpDocInfo;
 use Rector\BetterPhpDocParser\PhpDocInfo\PhpDocInfoFactory;
 use Rector\Comments\NodeDocBlock\DocBlockUpdater;
 use Rector\Doctrine\Enum\DoctrineClass;
@@ -74,26 +77,97 @@ public function getNodeTypes(): array
      */
     public function refactor(Node $node): ?ClassMethod
     {
-        $classMethodPhpDocInfo = $this->phpDocInfoFactory->createFromNodeOrEmpty($node);
-        $returnTagValueNode = $classMethodPhpDocInfo->getReturnTagValue();
+        $hasChanged = false;
+        if ($this->refactorReturnDocblockTag($node)) {
+            $hasChanged = true;
+        }
 
-        if (! $returnTagValueNode instanceof ReturnTagValueNode) {
+        if ($this->refactorNativeReturn($node)) {
+            $hasChanged = true;
+        }
+
+        if (! $hasChanged) {
             return null;
         }
 
-        if ($node->returnType !== null && $this->isName($node->returnType, DoctrineClass::COLLECTION)) {
-            $hasNativeCollectionType = true;
-        } else {
-            $hasNativeCollectionType = false;
+        return $node;
+    }
+
+    private function refactorReturnDocblockTag(ClassMethod $classMethod): bool
+    {
+        $phpDocInfo = $this->phpDocInfoFactory->createFromNode($classMethod);
+        if (! $phpDocInfo instanceof PhpDocInfo) {
+            return false;
         }
 
+        $returnTagValueNode = $phpDocInfo->getReturnTagValue();
+        if (! $returnTagValueNode instanceof ReturnTagValueNode) {
+            return false;
+        }
+
+        $hasNativeCollectionType = $this->hasNativeCollectionType($classMethod);
+
         $hasChanged = $this->unionCollectionTagValueNodeNarrower->narrow($returnTagValueNode, $hasNativeCollectionType);
         if ($hasChanged === false) {
-            return null;
+            return false;
         }
 
-        $this->docBlockUpdater->updateRefactoredNodeWithPhpDocInfo($node);
+        $this->docBlockUpdater->updateRefactoredNodeWithPhpDocInfo($classMethod);
 
-        return $node;
+        return true;
+    }
+
+    private function hasNativeCollectionType(ClassMethod $classMethod): bool
+    {
+        if (! $classMethod->returnType instanceof Node) {
+            return false;
+        }
+
+        return $this->isName($classMethod->returnType, DoctrineClass::COLLECTION);
+    }
+
+    private function refactorNativeReturn(ClassMethod $classMethod): bool
+    {
+        if (! $classMethod->returnType instanceof Node) {
+            return false;
+        }
+
+        if ($classMethod->returnType instanceof NullableType && $this->isName(
+            $classMethod->returnType->type,
+            DoctrineClass::COLLECTION
+        )) {
+            // unwrap nullable type
+            $classMethod->returnType = $classMethod->returnType->type;
+            return true;
+        }
+
+        if (! $classMethod->returnType instanceof UnionType) {
+            return false;
+        }
+
+        $unionType = $classMethod->returnType;
+        if (! $this->hasNativeReturnCollectionType($unionType)) {
+            return false;
+        }
+
+        // remove null from union type
+        foreach ($unionType->types as $key => $unionedType) {
+            if ($this->isName($unionedType, 'null')) {
+                unset($unionType->types[$key]);
+            }
+        }
+
+        return true;
+    }
+
+    private function hasNativeReturnCollectionType(UnionType $unionType): bool
+    {
+        foreach ($unionType->types as $unionedType) {
+            if ($this->isName($unionedType, DoctrineClass::COLLECTION)) {
+                return true;
+            }
+        }
+
+        return false;
     }
 }
diff --git a/rules/TypedCollections/Rector/FuncCall/ArrayMapOnCollectionToArrayRector.php b/rules/TypedCollections/Rector/FuncCall/ArrayMapOnCollectionToArrayRector.php
index f3a1cda8..ae07e51a 100644
--- a/rules/TypedCollections/Rector/FuncCall/ArrayMapOnCollectionToArrayRector.php
+++ b/rules/TypedCollections/Rector/FuncCall/ArrayMapOnCollectionToArrayRector.php
@@ -25,7 +25,7 @@ public function __construct(
     public function getRuleDefinition(): RuleDefinition
     {
         return new RuleDefinition(
-            'Change array_map on Collection typed property to ->toArray() call, to always provide an array',
+            'Change array_map() and array_filter() on Collection typed property to ->toArray() call, to always provide an array',
             [
                 new CodeSample(
                     <<<'CODE_SAMPLE'
@@ -84,18 +84,38 @@ public function refactor(Node $node): ?FuncCall
             return null;
         }
 
-        if (! $this->isName($node->name, 'array_map')) {
-            return null;
+        if ($this->isName($node->name, 'array_map')) {
+            return $this->refactorArrayMap($node);
+        }
+
+        if ($this->isName($node->name, 'array_filter')) {
+            $this->refactorArrayFilter($node);
         }
 
-        $secondArg = $node->getArgs()[1];
+        return null;
+    }
 
+    private function refactorArrayMap(FuncCall $funcCall): null|FuncCall
+    {
+        $secondArg = $funcCall->getArgs()[1];
         if (! $this->collectionTypeDetector->isCollectionType($secondArg->value)) {
             return null;
         }
 
         $secondArg->value = new MethodCall($secondArg->value, 'toArray');
 
-        return $node;
+        return $funcCall;
+    }
+
+    private function refactorArrayFilter(FuncCall $funcCall): ?FuncCall
+    {
+        $firstArg = $funcCall->getArgs()[0];
+        if (! $this->collectionTypeDetector->isCollectionType($firstArg->value)) {
+            return null;
+        }
+
+        $firstArg->value = new MethodCall($firstArg->value, 'toArray');
+
+        return $funcCall;
     }
 }