diff --git a/ext/tests/post_hook_returns_cloned_modified_object.phpt b/ext/tests/post_hook_returns_cloned_modified_object.phpt
index f5985af6..9f20f28e 100644
--- a/ext/tests/post_hook_returns_cloned_modified_object.phpt
+++ b/ext/tests/post_hook_returns_cloned_modified_object.phpt
@@ -10,7 +10,7 @@ opentelemetry
 class Foo
 {
     public ?string $a = null;
-    public function __construct(string $a = null)
+    public function __construct(string|null $a = null)
     {
         $this->a = $a;
     }
diff --git a/ext/tests/span_attribute/function_params_non_simple.phpt b/ext/tests/span_attribute/function_params_non_simple.phpt
index 1c09ce08..f0a9f80c 100644
--- a/ext/tests/span_attribute/function_params_non_simple.phpt
+++ b/ext/tests/span_attribute/function_params_non_simple.phpt
@@ -1,7 +1,7 @@
 --TEST--
 Check if function non-simple types can be passed as function params
 --SKIPIF--
-<?php if (PHP_VERSION_ID < 80100) die('skip requires PHP >= 8.1'); ?>
+<?php if (PHP_VERSION_ID < 80100 | PHP_VERSION_ID >= 80400) die('skip requires PHP >= 8.1 but < 8.4'); ?>
 --EXTENSIONS--
 opentelemetry
 --INI--
diff --git a/ext/tests/span_attribute/function_params_non_simple_84.phpt b/ext/tests/span_attribute/function_params_non_simple_84.phpt
new file mode 100644
index 00000000..3379b11a
--- /dev/null
+++ b/ext/tests/span_attribute/function_params_non_simple_84.phpt
@@ -0,0 +1,61 @@
+--TEST--
+Check if function non-simple types can be passed as function params
+--SKIPIF--
+<?php if (PHP_VERSION_ID < 80400) die('skip requires PHP >= 8.4O'); ?>
+--EXTENSIONS--
+opentelemetry
+--INI--
+opentelemetry.attr_hooks_enabled = On
+--FILE--
+<?php
+namespace OpenTelemetry\API\Instrumentation;
+
+include dirname(__DIR__) . '/mocks/WithSpan.php';
+include dirname(__DIR__) . '/mocks/SpanAttribute.php';
+include dirname(__DIR__) . '/mocks/WithSpanHandlerDumpAttributes.php';
+use OpenTelemetry\API\Instrumentation\WithSpan;
+use OpenTelemetry\API\Instrumentation\SpanAttribute;
+
+#[WithSpan]
+function foo(
+    #[SpanAttribute] array $one,
+    #[SpanAttribute] object $two,
+    #[SpanAttribute] callable $three,
+    #[SpanAttribute] $four,
+): void
+{
+    var_dump('foo');
+}
+
+foo(
+    ['foo' => 'bar'],
+    new \stdClass(),
+    function(){return 'fn';},
+    null,
+);
+?>
+--EXPECTF--
+string(3) "pre"
+array(4) {
+  ["one"]=>
+  array(1) {
+    ["foo"]=>
+    string(3) "bar"
+  }
+  ["two"]=>
+  object(stdClass)#1 (0) {
+  }
+  ["three"]=>
+  object(Closure)#2 (3) {
+    ["name"]=>
+    string(%s) "{closure:/%s/tests/span_attribute/function_params_non_simple_84.php:24}"
+    ["file"]=>
+    string(%s) "/%s/tests/span_attribute/function_params_non_simple_84.php"
+    ["line"]=>
+    int(24)
+  }
+  ["four"]=>
+  NULL
+}
+string(3) "foo"
+string(4) "post"
\ No newline at end of file