diff --git a/lib/laravel/serializable-closure/src/Support/ReflectionClosure.php b/lib/laravel/serializable-closure/src/Support/ReflectionClosure.php
index 97b73d21c7a..0544004355b 100644
--- a/lib/laravel/serializable-closure/src/Support/ReflectionClosure.php
+++ b/lib/laravel/serializable-closure/src/Support/ReflectionClosure.php
@@ -508,8 +508,7 @@ class ReflectionClosure extends ReflectionFunction
                     break;
                 case 'id_name':
                     switch ($token[0]) {
-                        // named arguments...
-                        case ':':
+                        case $token[0] === ':' && $context !== 'instanceof':
                             if ($lastState === 'closure' && $context === 'root') {
                                 $state = 'closure';
                                 $code .= $id_start.$token;
diff --git a/lib/thirdpartylibs.xml b/lib/thirdpartylibs.xml
index 8dca153892c..77f5eb7be2b 100644
--- a/lib/thirdpartylibs.xml
+++ b/lib/thirdpartylibs.xml
@@ -743,7 +743,7 @@ All rights reserved.</copyright>
   <library>
       <location>laravel/serializable-closure</location>
       <name>Serializable Closure</name>
-      <version>1.3.2</version>
+      <version>1.3.3</version>
       <license>MIT</license>
       <repository>https://github.com/laravel/serializable-closure</repository>
   </library>