diff --git a/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/elseif.php.inc b/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/elseif.php.inc
index cad374eaeb0..be3aa80a610 100644
--- a/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/elseif.php.inc
+++ b/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/elseif.php.inc
@@ -12,6 +12,6 @@ namespace Rector\Tests\Php83\Rector\BooleanAnd\JsonValidateRector\Fixture;
 
 if ($flag) {
     echo "skip";
-} elseif (json_validate($config, true)) {
+} elseif (json_validate($config)) {
     echo "valid config";
-}
+}
\ No newline at end of file
diff --git a/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/inline_string.php.inc b/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/inline_string.php.inc
index 20cb92fc231..a87faa97959 100644
--- a/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/inline_string.php.inc
+++ b/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/inline_string.php.inc
@@ -8,6 +8,6 @@ if (json_decode('{"a":1}', true) !== null && json_last_error() === JSON_ERROR_NO
 <?php
 namespace Rector\Tests\Php83\Rector\BooleanAnd\JsonValidateRector\Fixture;
 
-if (json_validate('{"a":1}', true)) {
+if (json_validate('{"a":1}')) {
     echo "inline";
 }
\ No newline at end of file
diff --git a/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/json_flag.php.inc b/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/json_flag.php.inc
index b1d9dd8fb2c..f026d8f1054 100644
--- a/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/json_flag.php.inc
+++ b/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/json_flag.php.inc
@@ -11,7 +11,7 @@ if (json_decode($json, true, 3) !== null && json_last_error() === JSON_ERROR_NON
 
 namespace Rector\Tests\Php83\Rector\BooleanAnd\JsonValidateRector\Fixture;
 
-if (json_validate($json, true, 3)){
+if (json_validate($json, 3)){
     echo 1;
 }
 ?>
\ No newline at end of file
diff --git a/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/json_validate.php.inc b/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/json_validate.php.inc
index c5a679544a1..87748e3d6f4 100644
--- a/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/json_validate.php.inc
+++ b/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/json_validate.php.inc
@@ -11,7 +11,7 @@ if (json_decode($json, true) !== null && json_last_error() === JSON_ERROR_NONE){
 
 namespace Rector\Tests\Php83\Rector\BooleanAnd\JsonValidateRector\Fixture;
 
-if (json_validate($json, true)){
+if (json_validate($json)){
     echo 1;
 }
 ?>
\ No newline at end of file
diff --git a/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/json_validate_base.php.inc b/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/json_validate_base.php.inc
index 13201b3bf84..6e3cd1767eb 100644
--- a/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/json_validate_base.php.inc
+++ b/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/json_validate_base.php.inc
@@ -11,7 +11,7 @@ if (json_decode($json, true, 512) !== null && json_last_error() === JSON_ERROR_N
 
 namespace Rector\Tests\Php83\Rector\BooleanAnd\JsonValidateRector\Fixture;
 
-if (json_validate($json, true, 512)){
+if (json_validate($json, 512)){
     echo 1;
 }
 ?>
\ No newline at end of file
diff --git a/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/json_validate_named.php.inc b/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/json_validate_named.php.inc
index 7d9e3cda76e..68fa4cffc32 100644
--- a/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/json_validate_named.php.inc
+++ b/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/json_validate_named.php.inc
@@ -9,7 +9,7 @@ if (json_decode(associative: true, json: $json) !== null && json_last_error() ==
 <?php
 namespace Rector\Tests\Php83\Rector\BooleanAnd\JsonValidateRector\Fixture;
 
-if (json_validate(associative: true, json: $json)){
+if (json_validate(json: $json)){
     echo 1;
 }
-?>
+?>
\ No newline at end of file
diff --git a/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/json_validate_named_base.php.inc b/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/json_validate_named_base.php.inc
index dd40a1364a7..08ebe7d8454 100644
--- a/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/json_validate_named_base.php.inc
+++ b/rules-tests/Php83/Rector/BooleanAnd/JsonValidateRector/Fixture/json_validate_named_base.php.inc
@@ -9,7 +9,7 @@ if (json_decode(json: $json, associative: true) !== null && json_last_error() ==
 <?php
 namespace Rector\Tests\Php83\Rector\BooleanAnd\JsonValidateRector\Fixture;
 
-if (json_validate(json: $json, associative: true)){
+if (json_validate(json: $json)){
     echo 1;
 }
-?>
+?>
\ No newline at end of file
diff --git a/rules/Php83/Rector/BooleanAnd/JsonValidateRector.php b/rules/Php83/Rector/BooleanAnd/JsonValidateRector.php
index efecc86c5fa..ea98802f0d4 100644
--- a/rules/Php83/Rector/BooleanAnd/JsonValidateRector.php
+++ b/rules/Php83/Rector/BooleanAnd/JsonValidateRector.php
@@ -95,8 +95,18 @@ public function refactor(Node $node): ?Node
             return null;
         }
 
+        // Remove associative argument (position 1 or named) - json_validate does not have this param
+        foreach ($args as $index => $arg) {
+            if ($arg instanceof Arg && (
+                ($arg->name !== null && $arg->name->toString() === 'associative') ||
+                ($arg->name === null && $index === 1)
+            )) {
+                unset($funcCall->args[$index]);
+                break;
+            }
+        }
+
         $funcCall->name = new Name('json_validate');
-        $funcCall->args = $args;
 
         return $funcCall;
     }