diff --git a/CHANGELOG.md b/CHANGELOG.md
index 78ebc50..c6a9fd9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,16 @@
 # Changelog
 
+## 0.6.1
+
+- Bumped `Version::API_SPEC_VERSION` to the Apify OpenAPI spec `v2-2026-09-10T091137Z`. This
+  version formally documents the `X-Apify-Pagination-*` response headers (including the
+  previously-undocumented `X-Apify-Pagination-Desc`) on all offset-paginated list endpoints and
+  the `offset`/`limit`/`desc` query parameters on the webhook dispatches list; this client already
+  implemented all of those.
+- `DatasetClient::listItems()` now prefers the `X-Apify-Pagination-Desc` response header over the
+  requested `desc` option when reporting `PaginationList::isDesc()`, matching the reference JS
+  client's `_createPaginationList` and the header newly documented in the spec above.
+
 ## 0.6.0
 
 - Synced to Apify OpenAPI spec `v2-2026-09-02T154542Z`.
diff --git a/src/Resource/DatasetClient.php b/src/Resource/DatasetClient.php
index 1861926..635dd5a 100644
--- a/src/Resource/DatasetClient.php
+++ b/src/Resource/DatasetClient.php
@@ -100,7 +100,10 @@ public function listItems(?DatasetListItemsOptions $options = null): PaginationL
             $this->headerInt($response, 'X-Apify-Pagination-Offset', 0),
             $this->headerInt($response, 'X-Apify-Pagination-Limit', $count),
             $count,
-            $options->desc ?? false,
+            // Prefer the server-reported X-Apify-Pagination-Desc header (matches the reference JS
+            // client's `_createPaginationList`); fall back to the requested option when the header
+            // is absent, e.g. against an older API version that predates it.
+            $this->headerBool($response, 'X-Apify-Pagination-Desc', $options->desc ?? false),
         );
     }
 
@@ -215,4 +218,10 @@ private function headerInt(ResponseInterface $response, string $name, int $fallb
         $value = $response->getHeaderLine($name);
         return $value === '' ? $fallback : (int) $value;
     }
+
+    private function headerBool(ResponseInterface $response, string $name, bool $fallback): bool
+    {
+        $value = $response->getHeaderLine($name);
+        return $value === '' ? $fallback : $value === 'true';
+    }
 }
diff --git a/src/Version.php b/src/Version.php
index 102349f..1018efa 100644
--- a/src/Version.php
+++ b/src/Version.php
@@ -17,13 +17,13 @@ final class Version
      * The semantic version of this client library (see https://semver.org/).
      * Changes to the public interface other than additive ones are considered breaking changes.
      */
-    public const CLIENT_VERSION = '0.6.0';
+    public const CLIENT_VERSION = '0.6.1';
 
     /**
      * The version of the Apify OpenAPI specification this client was generated and verified
      * against. Corresponds to the {@code info.version} field of the Apify OpenAPI document.
      */
-    public const API_SPEC_VERSION = 'v2-2026-09-02T154542Z';
+    public const API_SPEC_VERSION = 'v2-2026-09-10T091137Z';
 
     private function __construct()
     {
diff --git a/tests/Integration/DatasetIntegrationTest.php b/tests/Integration/DatasetIntegrationTest.php
index 2635832..9af3144 100644
--- a/tests/Integration/DatasetIntegrationTest.php
+++ b/tests/Integration/DatasetIntegrationTest.php
@@ -105,6 +105,8 @@ public function testDatasetCrudFlow(): void
             self::assertSame(3, $page->getCount());
             self::assertCount(3, $page->getItems());
             self::assertSame(1, $page->getItems()[0]['n']);
+            // isDesc() is sourced from the server's X-Apify-Pagination-Desc response header.
+            self::assertFalse($page->isDesc());
 
             $csv = $dataset->downloadItems(DownloadItemsFormat::CSV, new DatasetDownloadOptions(bom: true));
             self::assertStringContainsString('url', $csv);
diff --git a/tests/Unit/HttpClientTest.php b/tests/Unit/HttpClientTest.php
index 62581bd..c53f60e 100644
--- a/tests/Unit/HttpClientTest.php
+++ b/tests/Unit/HttpClientTest.php
@@ -7,6 +7,7 @@
 use Apify\Client\ApifyClient;
 use Apify\Client\Exception\ApifyApiException;
 use Apify\Client\Internal\Json;
+use Apify\Client\Options\DatasetListItemsOptions;
 use PHPUnit\Framework\TestCase;
 
 final class HttpClientTest extends TestCase
@@ -129,6 +130,44 @@ public function testDatasetItemsUseHeaderPagination(): void
         self::assertSame(42, $page->getTotal());
         self::assertSame(3, $page->getCount());
         self::assertSame(1, $page->getItems()[0]['n']);
+        self::assertFalse($page->isDesc());
+    }
+
+    public function testDatasetItemsDescHeaderTakesPrecedenceOverOption(): void
+    {
+        // The server-reported X-Apify-Pagination-Desc header must win over the requested option
+        // (matches the reference JS client), so a page always reflects what the server actually did.
+        $transport = (new MockTransport())->queueResponse(
+            200,
+            Json::encode([['n' => 1]]),
+            ['X-Apify-Pagination-Desc' => 'true']
+        );
+        $page = $this->client($transport)->dataset('ds1')->listItems(new DatasetListItemsOptions(desc: false));
+
+        self::assertTrue($page->isDesc());
+    }
+
+    public function testDatasetItemsDescHeaderFalseTakesPrecedenceOverOption(): void
+    {
+        // Symmetric case: the header must be genuinely *parsed*, not just checked for presence.
+        // A "false" header must win over a contradicting `desc: true` option, so this fails if
+        // headerBool() ever regresses to presence-only ("header is set, so trust the option").
+        $transport = (new MockTransport())->queueResponse(
+            200,
+            Json::encode([['n' => 1]]),
+            ['X-Apify-Pagination-Desc' => 'false']
+        );
+        $page = $this->client($transport)->dataset('ds1')->listItems(new DatasetListItemsOptions(desc: true));
+
+        self::assertFalse($page->isDesc());
+    }
+
+    public function testDatasetItemsDescFallsBackToOptionWhenHeaderMissing(): void
+    {
+        $transport = (new MockTransport())->queueResponse(200, Json::encode([['n' => 1]]));
+        $page = $this->client($transport)->dataset('ds1')->listItems(new DatasetListItemsOptions(desc: true));
+
+        self::assertTrue($page->isDesc());
     }
 
     public function testValidateInputParsesBareObject(): void