diff --git a/rules-tests/DeadCode/Rector/FunctionLike/NarrowWideUnionReturnTypeRector/Fixture/skip_constant_compare_from_vendor.php.inc b/rules-tests/DeadCode/Rector/FunctionLike/NarrowWideUnionReturnTypeRector/Fixture/skip_constant_compare_from_vendor.php.inc
new file mode 100644
index 00000000000..9cd3ad8e7ea
--- /dev/null
+++ b/rules-tests/DeadCode/Rector/FunctionLike/NarrowWideUnionReturnTypeRector/Fixture/skip_constant_compare_from_vendor.php.inc
@@ -0,0 +1,16 @@
+<?php
+
+namespace Rector\Tests\DeadCode\Rector\FunctionLike\NarrowWideUnionReturnTypeRector\Fixture;
+
+use Monolog\Logger;
+use Monolog\LogRecord;
+
+final class SkipConstantCompareFromVendor
+{
+    public function createLogRecord(int $level): array|LogRecord
+    {
+        return Logger::API === 2
+            ? ['level' => $level]
+            : new LogRecord();
+    }
+}
diff --git a/rules-tests/DeadCode/Rector/FunctionLike/NarrowWideUnionReturnTypeRector/Source/composer.json b/rules-tests/DeadCode/Rector/FunctionLike/NarrowWideUnionReturnTypeRector/Source/composer.json
new file mode 100644
index 00000000000..9c2eb41b878
--- /dev/null
+++ b/rules-tests/DeadCode/Rector/FunctionLike/NarrowWideUnionReturnTypeRector/Source/composer.json
@@ -0,0 +1,5 @@
+{
+    "require": {
+        "monolog/monolog": "^2.0 || ^3.0"
+    }
+}
diff --git a/rules-tests/DeadCode/Rector/FunctionLike/NarrowWideUnionReturnTypeRector/config/configured_rule.php b/rules-tests/DeadCode/Rector/FunctionLike/NarrowWideUnionReturnTypeRector/config/configured_rule.php
index d869bb77c80..e64ea99b6e6 100644
--- a/rules-tests/DeadCode/Rector/FunctionLike/NarrowWideUnionReturnTypeRector/config/configured_rule.php
+++ b/rules-tests/DeadCode/Rector/FunctionLike/NarrowWideUnionReturnTypeRector/config/configured_rule.php
@@ -2,11 +2,18 @@
 
 declare(strict_types=1);
 
+use Rector\Composer\ComposerJsonPackageVersionResolver;
 use Rector\Config\RectorConfig;
 use Rector\DeadCode\Rector\FunctionLike\NarrowWideUnionReturnTypeRector;
 use Rector\ValueObject\PhpVersionFeature;
 
 return static function (RectorConfig $rectorConfig): void {
+    $rectorConfig->singleton(
+        ComposerJsonPackageVersionResolver::class,
+        static fn (): ComposerJsonPackageVersionResolver => new ComposerJsonPackageVersionResolver(
+            __DIR__ . '/../Source/composer.json'
+        )
+    );
     $rectorConfig->rule(NarrowWideUnionReturnTypeRector::class);
     $rectorConfig->phpVersion(PhpVersionFeature::UNION_TYPES);
 };
diff --git a/rules/DeadCode/Rector/FunctionLike/NarrowWideUnionReturnTypeRector.php b/rules/DeadCode/Rector/FunctionLike/NarrowWideUnionReturnTypeRector.php
index a7a11b1a215..99ffb859742 100644
--- a/rules/DeadCode/Rector/FunctionLike/NarrowWideUnionReturnTypeRector.php
+++ b/rules/DeadCode/Rector/FunctionLike/NarrowWideUnionReturnTypeRector.php
@@ -7,8 +7,10 @@
 use PhpParser\Node;
 use PhpParser\Node\Expr;
 use PhpParser\Node\Expr\ArrowFunction;
+use PhpParser\Node\Expr\ClassConstFetch;
 use PhpParser\Node\Expr\Closure;
 use PhpParser\Node\Expr\ConstFetch;
+use PhpParser\Node\Expr\Ternary;
 use PhpParser\Node\FunctionLike;
 use PhpParser\Node\Name;
 use PhpParser\Node\NullableType;
@@ -19,12 +21,14 @@
 use PHPStan\PhpDocParser\Ast\PhpDoc\ReturnTagValueNode;
 use PHPStan\Reflection\ClassReflection;
 use PHPStan\Type\NullType;
+use PHPStan\Type\ObjectType;
 use PHPStan\Type\Type;
 use PHPStan\Type\TypeCombinator;
 use PHPStan\Type\UnionType as PHPStanUnionType;
 use Rector\BetterPhpDocParser\PhpDocInfo\PhpDocInfo;
 use Rector\BetterPhpDocParser\PhpDocInfo\PhpDocInfoFactory;
 use Rector\BetterPhpDocParser\PhpDocManipulator\PhpDocTypeChanger;
+use Rector\Composer\ComposerJsonPackageVersionResolver;
 use Rector\NodeTypeResolver\PHPStan\Type\TypeFactory;
 use Rector\PhpParser\Node\BetterNodeFinder;
 use Rector\PHPStanStaticTypeMapper\Enum\TypeKind;
@@ -49,7 +53,8 @@ public function __construct(
         private readonly SilentVoidResolver $silentVoidResolver,
         private readonly PhpDocTypeChanger $phpDocTypeChanger,
         private readonly PhpDocInfoFactory $phpDocInfoFactory,
-        private readonly TypeFactory $typeFactory
+        private readonly TypeFactory $typeFactory,
+        private readonly ComposerJsonPackageVersionResolver $composerJsonPackageVersionResolver
     ) {
     }
 
@@ -255,12 +260,54 @@ private function collectActualReturnTypes(array $returnStatements): array
                 continue;
             }
 
-            $returnTypes[] = $this->nodeTypeResolver->getNativeType($returnStatement->expr);
+            $returnTypes = [...$returnTypes, ...$this->resolveNativeReturnTypes($returnStatement->expr)];
         }
 
         return $returnTypes;
     }
 
+    /**
+     * @return Type[]
+     */
+    private function resolveNativeReturnTypes(Expr $expr): array
+    {
+        if (! $expr instanceof Ternary || ! $this->hasVendorClassConstFetch($expr->cond)) {
+            return [$this->nodeTypeResolver->getNativeType($expr)];
+        }
+
+        $ifExpr = $expr->if instanceof Expr ? $expr->if : $expr->cond;
+
+        return [...$this->resolveNativeReturnTypes($ifExpr), ...$this->resolveNativeReturnTypes($expr->else)];
+    }
+
+    private function hasVendorClassConstFetch(Expr $expr): bool
+    {
+        $classConstFetches = $this->betterNodeFinder->findInstanceOf($expr, ClassConstFetch::class);
+
+        foreach ($classConstFetches as $classConstFetch) {
+            $classType = $this->nodeTypeResolver->getType($classConstFetch->class);
+            if (! $classType instanceof ObjectType) {
+                continue;
+            }
+
+            $classReflection = $classType->getClassReflection();
+            if (! $classReflection instanceof ClassReflection) {
+                continue;
+            }
+
+            $fileName = $classReflection->getFileName();
+            if ($fileName === null) {
+                continue;
+            }
+
+            if ($this->composerJsonPackageVersionResolver->hasPackageMultiMajorVersions($fileName)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
     /**
      * @param Type[] $actualReturnTypes
      * @return Type[]
diff --git a/src/Composer/ComposerJsonPackageVersionResolver.php b/src/Composer/ComposerJsonPackageVersionResolver.php
new file mode 100644
index 00000000000..5bc5556e4c2
--- /dev/null
+++ b/src/Composer/ComposerJsonPackageVersionResolver.php
@@ -0,0 +1,158 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Composer;
+
+use Composer\Semver\VersionParser;
+use Rector\FileSystem\JsonFileSystem;
+use Rector\Skipper\FileSystem\PathNormalizer;
+use UnexpectedValueException;
+
+/**
+ * @see \Rector\Tests\Composer\ComposerJsonPackageVersionResolverTest
+ */
+final class ComposerJsonPackageVersionResolver
+{
+    /**
+     * @var null|array<string, string>
+     */
+    private ?array $packageVersionConstraints = null;
+
+    /**
+     * @var array<string, bool>
+     */
+    private array $packageMultiMajorVersions = [];
+
+    /**
+     * @var array<string, null|string>
+     */
+    private array $packageNamesByFilePath = [];
+
+    private readonly string $composerJsonFilePath;
+
+    public function __construct(?string $composerJsonFilePath = null)
+    {
+        $this->composerJsonFilePath = $composerJsonFilePath ?? getcwd() . '/composer.json';
+    }
+
+    public function hasPackageMultiMajorVersions(string $filePath): bool
+    {
+        $packageName = $this->resolvePackageName($filePath);
+        if ($packageName === null) {
+            return false;
+        }
+
+        return $this->packageMultiMajorVersions[$packageName] ??= $this->resolveHasPackageMultiMajorVersions(
+            $packageName
+        );
+    }
+
+    private function resolveHasPackageMultiMajorVersions(string $packageName): bool
+    {
+        $versionConstraint = $this->resolvePackageVersionConstraints()[$packageName] ?? null;
+        if ($versionConstraint === null) {
+            return false;
+        }
+
+        $versionConstraintParts = preg_split('#\s*\|\|?\s*#', $versionConstraint);
+        if ($versionConstraintParts === false || count($versionConstraintParts) < 2) {
+            return false;
+        }
+
+        $majorVersions = [];
+        $versionParser = new VersionParser();
+
+        foreach ($versionConstraintParts as $versionConstraintPart) {
+            if (preg_match('#\d+#', $versionConstraintPart) !== 1) {
+                continue;
+            }
+
+            try {
+                $constraint = $versionParser->parseConstraints($versionConstraintPart);
+            } catch (UnexpectedValueException) {
+                continue;
+            }
+
+            $lowerMajorVersion = $this->resolveMajorVersion($constraint->getLowerBound()->getVersion());
+            if ($lowerMajorVersion === null) {
+                continue;
+            }
+
+            $majorVersions[$lowerMajorVersion] = true;
+        }
+
+        return count($majorVersions) > 1;
+    }
+
+    private function resolvePackageName(string $filePath): ?string
+    {
+        if (array_key_exists($filePath, $this->packageNamesByFilePath)) {
+            return $this->packageNamesByFilePath[$filePath];
+        }
+
+        $normalizedFilePath = PathNormalizer::normalize($filePath);
+        $vendorPosition = strpos($normalizedFilePath, '/vendor/');
+
+        if ($vendorPosition === false) {
+            return $this->packageNamesByFilePath[$filePath] = null;
+        }
+
+        $vendorRelativePath = substr($normalizedFilePath, $vendorPosition + strlen('/vendor/'));
+        $pathParts = explode('/', $vendorRelativePath);
+
+        if (count($pathParts) < 2) {
+            return $this->packageNamesByFilePath[$filePath] = null;
+        }
+
+        return $this->packageNamesByFilePath[$filePath] = $pathParts[0] . '/' . $pathParts[1];
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    private function resolvePackageVersionConstraints(): array
+    {
+        if ($this->packageVersionConstraints !== null) {
+            return $this->packageVersionConstraints;
+        }
+
+        if (! file_exists($this->composerJsonFilePath)) {
+            return $this->packageVersionConstraints = [];
+        }
+
+        $composerJson = JsonFileSystem::readFilePath($this->composerJsonFilePath);
+        $packageVersionConstraints = [];
+
+        foreach (['require', 'require-dev'] as $requireKey) {
+            $requires = $composerJson[$requireKey] ?? [];
+            if (! is_array($requires)) {
+                continue;
+            }
+
+            foreach ($requires as $packageName => $versionConstraint) {
+                if (! is_string($packageName)) {
+                    continue;
+                }
+
+                if (! is_string($versionConstraint)) {
+                    continue;
+                }
+
+                $packageVersionConstraints[$packageName] = $versionConstraint;
+            }
+        }
+
+        return $this->packageVersionConstraints = $packageVersionConstraints;
+    }
+
+    private function resolveMajorVersion(string $version): ?int
+    {
+        $match = preg_match('#^(\d+)\.#', $version, $matches);
+        if ($match !== 1) {
+            return null;
+        }
+
+        return (int) $matches[1];
+    }
+}
diff --git a/stubs/Monolog/vendor/monolog/monolog/src/LogRecord.php b/stubs/Monolog/vendor/monolog/monolog/src/LogRecord.php
new file mode 100644
index 00000000000..edad0c23abd
--- /dev/null
+++ b/stubs/Monolog/vendor/monolog/monolog/src/LogRecord.php
@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Monolog;
+
+if (class_exists('Monolog\LogRecord')) {
+    return;
+}
+
+class LogRecord
+{
+}
diff --git a/stubs/Monolog/vendor/monolog/monolog/src/Logger.php b/stubs/Monolog/vendor/monolog/monolog/src/Logger.php
new file mode 100644
index 00000000000..a8553f3d7ec
--- /dev/null
+++ b/stubs/Monolog/vendor/monolog/monolog/src/Logger.php
@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Monolog;
+
+if (class_exists('Monolog\Logger')) {
+    return;
+}
+
+class Logger
+{
+    public const API = 2;
+}
diff --git a/tests/Composer/ComposerJsonPackageVersionResolverTest.php b/tests/Composer/ComposerJsonPackageVersionResolverTest.php
new file mode 100644
index 00000000000..ecb4a3d2308
--- /dev/null
+++ b/tests/Composer/ComposerJsonPackageVersionResolverTest.php
@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Tests\Composer;
+
+use Iterator;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\TestCase;
+use Rector\Composer\ComposerJsonPackageVersionResolver;
+
+final class ComposerJsonPackageVersionResolverTest extends TestCase
+{
+    #[DataProvider('provideData')]
+    public function test(string $composerJsonFilePath, bool $expected): void
+    {
+        $composerJsonPackageVersionResolver = new ComposerJsonPackageVersionResolver($composerJsonFilePath);
+
+        $hasPackageMultiMajorVersions = $composerJsonPackageVersionResolver->hasPackageMultiMajorVersions(
+            '/project/vendor/monolog/monolog/src/Logger.php'
+        );
+
+        $this->assertSame($expected, $hasPackageMultiMajorVersions);
+        $this->assertSame(
+            $expected,
+            $composerJsonPackageVersionResolver->hasPackageMultiMajorVersions(
+                '/project/vendor/monolog/monolog/src/Logger.php'
+            )
+        );
+        $this->assertSame(
+            $expected,
+            $composerJsonPackageVersionResolver->hasPackageMultiMajorVersions(
+                '/project/vendor/monolog/monolog/src/Handler/StreamHandler.php'
+            )
+        );
+    }
+
+    /**
+     * @return Iterator<(array<int, bool>|array<int, string>)>
+     */
+    public static function provideData(): Iterator
+    {
+        yield [__DIR__ . '/Fixture/ComposerJsonPackageVersionResolver/single_major.json', false];
+        yield [__DIR__ . '/Fixture/ComposerJsonPackageVersionResolver/multi_major.json', true];
+    }
+}
diff --git a/tests/Composer/Fixture/ComposerJsonPackageVersionResolver/multi_major.json b/tests/Composer/Fixture/ComposerJsonPackageVersionResolver/multi_major.json
new file mode 100644
index 00000000000..9c2eb41b878
--- /dev/null
+++ b/tests/Composer/Fixture/ComposerJsonPackageVersionResolver/multi_major.json
@@ -0,0 +1,5 @@
+{
+    "require": {
+        "monolog/monolog": "^2.0 || ^3.0"
+    }
+}
diff --git a/tests/Composer/Fixture/ComposerJsonPackageVersionResolver/single_major.json b/tests/Composer/Fixture/ComposerJsonPackageVersionResolver/single_major.json
new file mode 100644
index 00000000000..93f0b9fb0aa
--- /dev/null
+++ b/tests/Composer/Fixture/ComposerJsonPackageVersionResolver/single_major.json
@@ -0,0 +1,5 @@
+{
+    "require": {
+        "monolog/monolog": "^2.0"
+    }
+}