diff --git a/Classes/Domain/Search/ResultSet/Grouping/Parser/GroupedResultParser.php b/Classes/Domain/Search/ResultSet/Grouping/Parser/GroupedResultParser.php
index 968786a..fd9eb1d 100644
--- a/Classes/Domain/Search/ResultSet/Grouping/Parser/GroupedResultParser.php
+++ b/Classes/Domain/Search/ResultSet/Grouping/Parser/GroupedResultParser.php
@@ -30,9 +30,11 @@
 use ApacheSolrForTypo3\Solr\Domain\Search\ResultSet\Grouping\GroupItem;
 use ApacheSolrForTypo3\Solr\Domain\Search\ResultSet\Grouping\GroupItemCollection;
 use ApacheSolrForTypo3\Solr\Domain\Search\ResultSet\Result\Parser\AbstractResultParser;
+use ApacheSolrForTypo3\Solr\Domain\Search\ResultSet\Result\SearchResult;
 use ApacheSolrForTypo3\Solr\Domain\Search\ResultSet\Result\SearchResultCollection;
 use ApacheSolrForTypo3\Solr\Domain\Search\ResultSet\SearchResultSet;
 use ApacheSolrForTypo3\Solr\Domain\Search\SearchRequest;
+use ApacheSolrForTypo3\Solr\System\Solr\Document\Document;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
 
 /**
@@ -237,7 +239,7 @@ protected function buildGroupItemAndAddDocuments(SearchRequest $searchRequest, G
         $relevantResults = array_slice($rawGroup->doclist->docs, $offset, $perPage);
 
         foreach ($relevantResults as $rawDoc) {
-            $solrDocument = new \Apache_Solr_Document();
+            $solrDocument = new Document();
             foreach(get_object_vars($rawDoc) as $key => $value) {
                 $solrDocument->setField($key, $value);
             }
diff --git a/Classes/Query/Modifier/Grouping.php b/Classes/Query/Modifier/Grouping.php
index ca25f36..57f88b9 100644
--- a/Classes/Query/Modifier/Grouping.php
+++ b/Classes/Query/Modifier/Grouping.php
@@ -24,10 +24,13 @@
  *  This copyright notice MUST APPEAR in all copies of the script!
  ***************************************************************/
 
+use ApacheSolrForTypo3\Solr\Domain\Search\Query\ParameterBuilder\Grouping as GroupingParameter;
+use ApacheSolrForTypo3\Solr\Domain\Search\Query\QueryBuilder;
+use ApacheSolrForTypo3\Solr\Domain\Search\Query\Query;
 use ApacheSolrForTypo3\Solr\Domain\Search\SearchRequest;
 use ApacheSolrForTypo3\Solr\Domain\Search\SearchRequestAware;
-use ApacheSolrForTypo3\Solr\Domain\Search\Query\Query;
 use ApacheSolrForTypo3\Solr\Query\Modifier\Modifier;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
 
 
 /**
@@ -43,6 +46,22 @@ class Grouping implements Modifier, SearchRequestAware
      */
     protected $searchRequest;
 
+    /**
+     * QueryBuilder
+     *
+     * @var QueryBuilder|object
+     */
+    protected $queryBuilder;
+
+    /**
+     * AccessComponent constructor.
+     * @param QueryBuilder|null
+     */
+    public function __construct(QueryBuilder $queryBuilder = null)
+    {
+        $this->queryBuilder = $queryBuilder ?? GeneralUtility::makeInstance(QueryBuilder::class);
+    }
+
     /**
      * @param SearchRequest $searchRequest
      */
@@ -65,8 +84,8 @@ public function modifyQuery(Query $query)
             return $query;
         }
 
-        $grouping = $query->getGrouping();
-        $grouping->setIsEnabled(true);
+        $grouping = new GroupingParameter(true);
+
 
         $groupingConfiguration = $this->searchRequest->getContextTypoScriptConfiguration()->getObjectByPathOrDefault('plugin.tx_solr.search.grouping.', []);
 
@@ -103,6 +122,8 @@ public function modifyQuery(Query $query)
             }
         }
 
+        $query = $this->queryBuilder->startFrom($query)->useGrouping($grouping)->getQuery();
+
         return $query;
     }
 }
diff --git a/Tests/Unit/Domain/Search/ResultSet/Grouping/Parser/GroupedResultsParserTest.php b/Tests/Unit/Domain/Search/ResultSet/Grouping/Parser/GroupedResultsParserTest.php
index e7d19a9..2b27ed0 100644
--- a/Tests/Unit/Domain/Search/ResultSet/Grouping/Parser/GroupedResultsParserTest.php
+++ b/Tests/Unit/Domain/Search/ResultSet/Grouping/Parser/GroupedResultsParserTest.php
@@ -17,6 +17,7 @@
 use ApacheSolrForTypo3\Solr\Domain\Search\ResultSet\SearchResultSet;
 use ApacheSolrForTypo3\Solr\Domain\Search\SearchRequest;
 use ApacheSolrForTypo3\Solr\System\Configuration\TypoScriptConfiguration;
+use ApacheSolrForTypo3\Solr\System\Solr\ResponseAdapter;
 use ApacheSolrForTypo3\Solr\Tests\Unit\UnitTest;
 use ApacheSolrForTypo3\Solrfluidgrouping\Domain\Search\ResultSet\Grouping\Parser\GroupedResultParser;
 
@@ -117,13 +118,11 @@ protected function getSearchResultSetMockFromConfigurationAndFixtureFileName(Typ
 
     /**
      * @param $fixtureFile
-     * @return \Apache_Solr_Response
+     * @return ResponseAdapter
      */
     protected function getFakeApacheSolrResponse($fixtureFile)
     {
         $fakeResponseJson = $this->getFixtureContentByName($fixtureFile);
-        $httpResponseMock = $this->getDumbMock('\Apache_Solr_HttpTransport_Response');
-        $httpResponseMock->expects($this->any())->method('getBody')->will($this->returnValue($fakeResponseJson));
-        return new \Apache_Solr_Response($httpResponseMock);
+        return new ResponseAdapter($fakeResponseJson);
     }
 }
\ No newline at end of file
diff --git a/Tests/Unit/Domain/Search/ResultSet/SearchResultSetServiceTest.php b/Tests/Unit/Domain/Search/ResultSet/SearchResultSetServiceTest.php
index a3d19f3..faf1fb8 100644
--- a/Tests/Unit/Domain/Search/ResultSet/SearchResultSetServiceTest.php
+++ b/Tests/Unit/Domain/Search/ResultSet/SearchResultSetServiceTest.php
@@ -20,6 +20,7 @@
 use ApacheSolrForTypo3\Solr\Domain\Search\SearchRequest;
 use ApacheSolrForTypo3\Solr\Search;
 use ApacheSolrForTypo3\Solr\System\Configuration\TypoScriptConfiguration;
+use ApacheSolrForTypo3\Solr\System\Solr\ResponseAdapter;
 use ApacheSolrForTypo3\Solr\Tests\Unit\UnitTest;
 use ApacheSolrForTypo3\Solrfluidgrouping\Domain\Search\ResultSet\Grouping\Parser\GroupedResultParser;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
@@ -107,15 +108,11 @@ public function canCreateGroups()
 
     /**
      * @param $fixtureFile
-     * @return \Apache_Solr_Response
+     * @return ResponseAdapter
      */
     protected function getFakeApacheSolrResponse($fixtureFile)
     {
         $fakeResponseJson = $this->getFixtureContentByName($fixtureFile);
-        $httpResponseMock = $this->getDumbMock('\Apache_Solr_HttpTransport_Response');
-        $httpResponseMock->expects($this->any())->method('getBody')->will($this->returnValue($fakeResponseJson));
-
-
-        return new \Apache_Solr_Response($httpResponseMock);
+        return new ResponseAdapter($fakeResponseJson);
     }
 }
diff --git a/ext_emconf.php b/ext_emconf.php
index 5e74b93..899ab15 100644
--- a/ext_emconf.php
+++ b/ext_emconf.php
@@ -16,7 +16,7 @@
     'constraints' => array(
         'depends' => array(
             'scheduler' => '',
-            'solr' => '8.0.1-',
+            'solr' => '9.0.0-',
             'extbase' => '8.7.0-9.3.99',
             'fluid' => '8.7.0-9.3.99',
             'typo3' => '8.7.0-9.3.99'