diff --git a/README.md b/README.md
index 9eac779..3a6518c 100644
--- a/README.md
+++ b/README.md
@@ -39,6 +39,7 @@ To complete this quickstart, make sure that your development environment meets t
 
 - Requires [PHP 8.1+](https://php.net/releases/)
 
+
 ## Setup
 
 ### Installation
@@ -49,6 +50,14 @@ First, install Gemini via the [Composer](https://getcomposer.org/) package manag
 composer require google-gemini-php/client
 ```
 
+If you want to use beta features you should install beta branch:
+
+```bash
+composer require google-gemini-php/client:1.0.4-beta
+```
+
+For beta documentation: https://github.com/google-gemini-php/client/tree/beta
+
 Ensure that the `php-http/discovery` composer plugin is allowed to run or install a client manually if your project does not already have a PSR-18 client integrated.
 ```bash
 composer require guzzlehttp/guzzle
diff --git a/src/Data/Candidate.php b/src/Data/Candidate.php
index bd12817..93af1f6 100644
--- a/src/Data/Candidate.php
+++ b/src/Data/Candidate.php
@@ -34,7 +34,7 @@ public function __construct(
     ) {}
 
     /**
-     * @param  array{ content: ?array{ parts: array{ array{ text: ?string, inlineData: array{ mimeType: string, data: string } } }, role: string }, finishReason: ?string, safetyRatings: ?array{ array{ category: string, probability: string, blocked: ?bool } }, citationMetadata: ?array{ citationSources: array{ array{ startIndex: int, endIndex: int, uri: string, license: string} } }, index: ?int, tokenCount: ?int, avgLogprobs: ?float }  $attributes
+     * @param  array{ content: ?array{ parts: array{ array{ text: ?string, inlineData: array{ mimeType: string, data: string } } }, role: string }, finishReason: ?string, safetyRatings: ?array{ array{ category: string, probability: string, blocked: ?bool } }, citationMetadata: ?array{ citationSources: array{ array{ startIndex: int, endIndex: int, uri: string, license: ?string} } }, index: ?int, tokenCount: ?int, avgLogprobs: ?float }  $attributes
      */
     public static function from(array $attributes): self
     {
diff --git a/src/Data/CitationMetadata.php b/src/Data/CitationMetadata.php
index 962f0c9..7b7a11b 100644
--- a/src/Data/CitationMetadata.php
+++ b/src/Data/CitationMetadata.php
@@ -21,7 +21,7 @@ public function __construct(
     ) {}
 
     /**
-     * @param  array{ citationSources: array{ array{ startIndex: int, endIndex: int, uri: string, license: string } } }  $attributes
+     * @param  array{ citationSources: array{ array{ startIndex: int, endIndex: int, uri: string, license: ?string } } }  $attributes
      */
     public static function from(array $attributes): self
     {
diff --git a/src/Data/CitationSource.php b/src/Data/CitationSource.php
index 7f245de..5f23919 100644
--- a/src/Data/CitationSource.php
+++ b/src/Data/CitationSource.php
@@ -17,7 +17,7 @@ final class CitationSource implements Arrayable
      * @param  int  $startIndex  Start of segment of the response that is attributed to this source. Index indicates the start of the segment, measured in bytes.
      * @param  int  $endIndex  End of the attributed segment, exclusive.
      * @param  string  $uri  URI that is attributed as a source for a portion of the text.
-     * @param  string  $license  License for the GitHub project that is attributed as a source for segment. License info is required for code citations.
+     * @param  string|null  $license  License for the GitHub project that is attributed as a source for segment. License info is required for code citations.
      */
     public function __construct(
         public readonly int $startIndex,
@@ -27,7 +27,7 @@ public function __construct(
     ) {}
 
     /**
-     * @param  array{ startIndex: int, endIndex: int, uri: string, license: string}  $attributes
+     * @param  array{ startIndex: int, endIndex: int, uri: string, license: ?string}  $attributes
      */
     public static function from(array $attributes): self
     {
@@ -35,7 +35,7 @@ public static function from(array $attributes): self
             startIndex: $attributes['startIndex'],
             endIndex: $attributes['endIndex'],
             uri: $attributes['uri'],
-            license: $attributes['license'],
+            license: $attributes['license'] ?? null,
         );
     }
 
diff --git a/src/Resources/GenerativeModel.php b/src/Resources/GenerativeModel.php
index c995465..b132701 100644
--- a/src/Resources/GenerativeModel.php
+++ b/src/Resources/GenerativeModel.php
@@ -84,7 +84,7 @@ public function countTokens(string|Blob|array|Content ...$parts): CountTokensRes
      */
     public function generateContent(string|Blob|array|Content ...$parts): GenerateContentResponse
     {
-        /** @var ResponseDTO<array{ candidates: ?array{ array{ content: array{ parts: array{ array{ text: ?string, inlineData: array{ mimeType: string, data: string } } }, role: string }, finishReason: string, safetyRatings: array{ array{ category: string, probability: string, blocked: ?bool } }, citationMetadata: ?array{ citationSources: array{ array{ startIndex: int, endIndex: int, uri: string, license: string} } }, index: int, tokenCount: ?int, avgLogprobs: ?float } }, promptFeedback: ?array{ safetyRatings: array{ array{ category: string, probability: string, blocked: ?bool } }, blockReason: ?string }, usageMetadata: array{ promptTokenCount: int, candidatesTokenCount: int, totalTokenCount: int, cachedContentTokenCount: ?int }, usageMetadata: array{ promptTokenCount: int, candidatesTokenCount: int, totalTokenCount: int, cachedContentTokenCount: ?int } }> $response */
+        /** @var ResponseDTO<array{ candidates: ?array{ array{ content: array{ parts: array{ array{ text: ?string, inlineData: array{ mimeType: string, data: string } } }, role: string }, finishReason: string, safetyRatings: array{ array{ category: string, probability: string, blocked: ?bool } }, citationMetadata: ?array{ citationSources: array{ array{ startIndex: int, endIndex: int, uri: string, license: ?string} } }, index: int, tokenCount: ?int, avgLogprobs: ?float } }, promptFeedback: ?array{ safetyRatings: array{ array{ category: string, probability: string, blocked: ?bool } }, blockReason: ?string }, usageMetadata: array{ promptTokenCount: int, candidatesTokenCount: int, totalTokenCount: int, cachedContentTokenCount: ?int }, usageMetadata: array{ promptTokenCount: int, candidatesTokenCount: int, totalTokenCount: int, cachedContentTokenCount: ?int } }> $response */
         $response = $this->transporter->request(
             request: new GenerateContentRequest(
                 model: $this->model,
diff --git a/src/Responses/GenerativeModel/GenerateContentResponse.php b/src/Responses/GenerativeModel/GenerateContentResponse.php
index 9eaf705..79b89cc 100644
--- a/src/Responses/GenerativeModel/GenerateContentResponse.php
+++ b/src/Responses/GenerativeModel/GenerateContentResponse.php
@@ -96,7 +96,7 @@ public function json(): mixed
     }
 
     /**
-     * @param  array{ candidates: ?array{ array{ content: array{ parts: array{ array{ text: ?string, inlineData: array{ mimeType: string, data: string } } }, role: string }, finishReason: string, safetyRatings: array{ array{ category: string, probability: string, blocked: ?bool } }, citationMetadata: ?array{ citationSources: array{ array{ startIndex: int, endIndex: int, uri: string, license: string} } }, index: int, tokenCount: ?int, avgLogprobs: ?float } }, promptFeedback: ?array{ safetyRatings: array{ array{ category: string, probability: string, blocked: ?bool } }, blockReason: ?string }, usageMetadata: array{ promptTokenCount: int, candidatesTokenCount: int, totalTokenCount: int, cachedContentTokenCount: ?int } }  $attributes
+     * @param  array{ candidates: ?array{ array{ content: array{ parts: array{ array{ text: ?string, inlineData: array{ mimeType: string, data: string } } }, role: string }, finishReason: string, safetyRatings: array{ array{ category: string, probability: string, blocked: ?bool } }, citationMetadata: ?array{ citationSources: array{ array{ startIndex: int, endIndex: int, uri: string, license: ?string} } }, index: int, tokenCount: ?int, avgLogprobs: ?float } }, promptFeedback: ?array{ safetyRatings: array{ array{ category: string, probability: string, blocked: ?bool } }, blockReason: ?string }, usageMetadata: array{ promptTokenCount: int, candidatesTokenCount: int, totalTokenCount: int, cachedContentTokenCount: ?int } }  $attributes
      */
     public static function from(array $attributes): self
     {