diff --git a/.github/workflows/code_analysis.yaml b/.github/workflows/code_analysis.yaml
index dceab9f1..07712b30 100644
--- a/.github/workflows/code_analysis.yaml
+++ b/.github/workflows/code_analysis.yaml
@@ -50,7 +50,8 @@ jobs:
             -
                 uses: shivammathur/setup-php@v2
                 with:
-                    php-version: 8.3
+                    # use php 8.5 to allow test (void) cast syntax
+                    php-version: 8.5
                     coverage: none
 
             -   uses: "ramsey/composer-install@v2"
diff --git a/config/set/downgrade-php85.php b/config/set/downgrade-php85.php
index bac19e15..b2b2b876 100644
--- a/config/set/downgrade-php85.php
+++ b/config/set/downgrade-php85.php
@@ -4,6 +4,7 @@
 
 use Rector\Config\RectorConfig;
 use Rector\DowngradePhp85\Rector\Class_\DowngradeFinalPropertyPromotionRector;
+use Rector\DowngradePhp85\Rector\Expression\DowngradeVoidCastRector;
 use Rector\DowngradePhp85\Rector\FuncCall\DowngradeArrayFirstLastRector;
 use Rector\DowngradePhp85\Rector\StmtsAwareInterface\DowngradePipeOperatorRector;
 use Rector\Renaming\Rector\ClassConstFetch\RenameClassConstFetchRector;
@@ -18,6 +19,7 @@
         DowngradeArrayFirstLastRector::class,
         DowngradeFinalPropertyPromotionRector::class,
         DowngradePipeOperatorRector::class,
+        DowngradeVoidCastRector::class,
     ]);
 
     // https://wiki.php.net/rfc/deprecations_php_8_5#deprecate_driver_specific_pdo_constants_and_methods
diff --git a/rules-tests/DowngradePhp85/Rector/Expression/DowngradeVoidCastRector/DowngradeVoidCastRectorTest.php b/rules-tests/DowngradePhp85/Rector/Expression/DowngradeVoidCastRector/DowngradeVoidCastRectorTest.php
new file mode 100644
index 00000000..51fd6f39
--- /dev/null
+++ b/rules-tests/DowngradePhp85/Rector/Expression/DowngradeVoidCastRector/DowngradeVoidCastRectorTest.php
@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Tests\DowngradePhp85\Rector\Expression\DowngradeVoidCastRector;
+
+use Iterator;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\RequiresPhp;
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+
+final class DowngradeVoidCastRectorTest extends AbstractRectorTestCase
+{
+    #[DataProvider('provideData')]
+    #[RequiresPhp('8.5')]
+    public function test(string $filePath): void
+    {
+        $this->doTestFile($filePath);
+    }
+
+    public static function provideData(): Iterator
+    {
+        return self::yieldFilesFromDirectory(__DIR__ . '/Fixture');
+    }
+
+    public function provideConfigFilePath(): string
+    {
+        return __DIR__ . '/config/configured_rule.php';
+    }
+}
diff --git a/rules-tests/DowngradePhp85/Rector/Expression/DowngradeVoidCastRector/Fixture/fixture.php.inc b/rules-tests/DowngradePhp85/Rector/Expression/DowngradeVoidCastRector/Fixture/fixture.php.inc
new file mode 100644
index 00000000..8bbe5cd8
--- /dev/null
+++ b/rules-tests/DowngradePhp85/Rector/Expression/DowngradeVoidCastRector/Fixture/fixture.php.inc
@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Tests\DowngradePhp85\Rector\Expression\DowngradeVoidCastRector\Fixture;
+
+final class Fixture
+{
+    #[\NoDiscard]
+    function foo(): string {
+        return 'bar';
+    }
+
+    public function run()
+    {
+        (void) $this->foo();
+    }
+}
+
+?>
+-----
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Tests\DowngradePhp85\Rector\Expression\DowngradeVoidCastRector\Fixture;
+
+final class Fixture
+{
+    #[\NoDiscard]
+    function foo(): string {
+        return 'bar';
+    }
+
+    public function run()
+    {
+        $_void = $this->foo();
+    }
+}
+
+?>
diff --git a/rules-tests/DowngradePhp85/Rector/Expression/DowngradeVoidCastRector/Fixture/skip_different_func_call.php.inc b/rules-tests/DowngradePhp85/Rector/Expression/DowngradeVoidCastRector/Fixture/skip_different_func_call.php.inc
new file mode 100644
index 00000000..36aa6ce8
--- /dev/null
+++ b/rules-tests/DowngradePhp85/Rector/Expression/DowngradeVoidCastRector/Fixture/skip_different_func_call.php.inc
@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Tests\DowngradePhp85\Rector\Expression\DowngradeVoidCastRector\Fixture;
+
+final class SkipDifferentCast
+{
+    public function run()
+    {
+        (int) call();
+    }
+}
+
+?>
diff --git a/rules-tests/DowngradePhp85/Rector/Expression/DowngradeVoidCastRector/config/configured_rule.php b/rules-tests/DowngradePhp85/Rector/Expression/DowngradeVoidCastRector/config/configured_rule.php
new file mode 100644
index 00000000..1566854b
--- /dev/null
+++ b/rules-tests/DowngradePhp85/Rector/Expression/DowngradeVoidCastRector/config/configured_rule.php
@@ -0,0 +1,10 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+use Rector\DowngradePhp85\Rector\Expression\DowngradeVoidCastRector;
+
+return static function (RectorConfig $rectorConfig): void {
+    $rectorConfig->rule(DowngradeVoidCastRector::class);
+};
diff --git a/rules/DowngradePhp80/Rector/ClassMethod/DowngradeTrailingCommasInParamUseRector.php b/rules/DowngradePhp80/Rector/ClassMethod/DowngradeTrailingCommasInParamUseRector.php
index dac20d57..1f8f75e2 100644
--- a/rules/DowngradePhp80/Rector/ClassMethod/DowngradeTrailingCommasInParamUseRector.php
+++ b/rules/DowngradePhp80/Rector/ClassMethod/DowngradeTrailingCommasInParamUseRector.php
@@ -118,6 +118,10 @@ private function cleanTrailingComma(Closure|ClassMethod|Function_ $node, array $
     {
         $lastPosition = array_key_last($array);
 
+        if ($lastPosition === null) {
+            return null;
+        }
+
         $last = $array[$lastPosition];
         if (! $this->followedByCommaAnalyzer->isFollowed($this->file, $last)) {
             return null;
diff --git a/rules/DowngradePhp80/Rector/Class_/DowngradePropertyPromotionRector.php b/rules/DowngradePhp80/Rector/Class_/DowngradePropertyPromotionRector.php
index 2879d3a3..dd96ee9a 100644
--- a/rules/DowngradePhp80/Rector/Class_/DowngradePropertyPromotionRector.php
+++ b/rules/DowngradePhp80/Rector/Class_/DowngradePropertyPromotionRector.php
@@ -112,7 +112,7 @@ private function getOldComments(ClassMethod $constructorClassMethod): array
     {
         $oldComments = [];
         foreach ($constructorClassMethod->params as $param) {
-            $oldComments[$this->getName($param->var)] = $param->getAttribute(AttributeKey::COMMENTS);
+            $oldComments[(string) $this->getName($param->var)] = $param->getAttribute(AttributeKey::COMMENTS);
         }
 
         return $oldComments;
diff --git a/rules/DowngradePhp85/Rector/Expression/DowngradeVoidCastRector.php b/rules/DowngradePhp85/Rector/Expression/DowngradeVoidCastRector.php
new file mode 100644
index 00000000..931b9f32
--- /dev/null
+++ b/rules/DowngradePhp85/Rector/Expression/DowngradeVoidCastRector.php
@@ -0,0 +1,84 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\DowngradePhp85\Rector\Expression;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\Assign;
+use PhpParser\Node\Expr\Cast\Void_;
+use PhpParser\Node\Expr\Variable;
+use PhpParser\Node\Stmt\Expression;
+use Rector\Naming\Naming\VariableNaming;
+use Rector\PHPStan\ScopeFetcher;
+use Rector\Rector\AbstractRector;
+use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
+use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
+
+/**
+ * @see https://wiki.php.net/rfc/marking_return_value_as_important
+ * @see \Rector\Tests\DowngradePhp85\Rector\Expression\DowngradeVoidCastRector\DowngradeVoidCastRectorTest
+ */
+final class DowngradeVoidCastRector extends AbstractRector
+{
+    public function __construct(
+        private readonly VariableNaming $variableNaming
+    ) {
+    }
+
+    public function getNodeTypes(): array
+    {
+        return [Expression::class];
+    }
+
+    public function getRuleDefinition(): RuleDefinition
+    {
+        return new RuleDefinition(
+            'Replace void casts with proper handling of return values',
+            [
+                new CodeSample(
+                    <<<'CODE_SAMPLE'
+#[\NoDiscard]
+function getPhpVersion(): string
+{
+    return 'PHP 8.5';
+}
+
+(void) getPhpVersion();
+CODE_SAMPLE
+                    ,
+                    <<<'CODE_SAMPLE'
+#[\NoDiscard]
+function getPhpVersion(): string
+{
+    return 'PHP 8.5';
+}
+
+$_void = getPhpVersion();
+CODE_SAMPLE
+                ),
+            ]
+        );
+    }
+
+    /**
+     * @param Expression $node
+     */
+    public function refactor(Node $node): ?Node
+    {
+        if (! $node->expr instanceof Void_) {
+            return null;
+        }
+
+        $scope = ScopeFetcher::fetch($node);
+        $variable = new Variable($this->variableNaming->createCountedValueName('_void', $scope));
+
+        // the assign is needed to avoid warning
+        // see https://3v4l.org/ie68D#v8.5.3 vs https://3v4l.org/nLc5J#v8.5.3
+        $node->expr = new Assign(
+            $variable,
+            $node->expr->expr
+        );
+        return $node;
+    }
+}