diff --git a/composer.json b/composer.json
index e8bfd50..163f51d 100644
--- a/composer.json
+++ b/composer.json
@@ -2,7 +2,7 @@
   "name": "volt-test/php-sdk",
   "description": "Volt Test PHP SDK - A performance testing tool for PHP applications",
   "type": "library",
-  "version": "0.9.0",
+  "version": "0.9.1",
   "keywords": [
     "volt-test",
     "php-sdk",
diff --git a/src/Extractors/JsonExtractor.php b/src/Extractors/JsonExtractor.php
index c7c6fb2..7a1cb17 100644
--- a/src/Extractors/JsonExtractor.php
+++ b/src/Extractors/JsonExtractor.php
@@ -44,10 +44,11 @@ public function validate(): bool
         if (empty($this->selector) || $this->selector === '$.') {
             throw new InvalidJsonPathException('JSON path cannot be empty');
         }
-        // Validate the selector ex: $.meta.token
+        // Validate the selector ex: $.meta.token or $.data[0].name
         // Validate the selector follows proper JSON path format
         // Should start with $ followed by dot and valid path segments
-        if (! preg_match('/^\$(\.[a-zA-Z0-9_]+)*$/', $this->selector)) {
+        $pattern = '/^\$(\.[a-zA-Z0-9_]+|\[[0-9]+\])*$/';
+        if (! preg_match($pattern, $this->selector)) {
             throw new InvalidJsonPathException('Invalid JSON path');
         }
 
diff --git a/src/Platform.php b/src/Platform.php
index 5ca62a9..85f5de7 100644
--- a/src/Platform.php
+++ b/src/Platform.php
@@ -6,7 +6,7 @@ class Platform
 {
     private const BINARY_NAME = 'volt-test';
 
-    private const ENGINE_CURRENT_VERSION = 'v0.1.1';
+    private const ENGINE_CURRENT_VERSION = 'v0.9.1';
     private const BASE_DOWNLOAD_URL = 'https://github.com/volt-test/binaries/releases/download';
     private const SUPPORTED_PLATFORMS = [
         'linux-amd64' => 'volt-test-linux-amd64',
diff --git a/tests/Units/JsonExtractorTest.php b/tests/Units/JsonExtractorTest.php
index b16c437..6a7dcfb 100644
--- a/tests/Units/JsonExtractorTest.php
+++ b/tests/Units/JsonExtractorTest.php
@@ -46,6 +46,9 @@ public static function validJsonPathProvider(): array
             ['with_underscore'],
             ['with.numbers.123'],
             ['mixed.path_with.numbers123'],
+            ['mixed[0].path'],
+            ['mixed[0].path[1]'],
+            ['mixed[0].path[1].with[2].numbers[3]'],
         ];
     }
 
@@ -67,6 +70,12 @@ public static function invalidJsonPathProvider(): array
             ['$invalid.start'],
             ['invalid$.middle'],
             ['path.with.$'],
+            ['$.data[abc]'],
+            ['$.data[0].name[abc]'],
+            ['$.data[0].name[0].'],
+            ['$.data[0].name[0].[1]'],
+            ['$.data[0].name[0].[1].'],
+            ['$.data[0].name[0].[1].name'],
         ];
     }