diff --git a/.gitignore b/.gitignore
index e931b1eb..ff43aedb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,4 @@ tests/_reports
 tests/database_settings.yml
 vendor/
 phpunit.xml
+.idea
diff --git a/src/HttpDriver/Result/StatementStatistics.php b/src/HttpDriver/Result/StatementStatistics.php
index c72aa103..43be3a8a 100644
--- a/src/HttpDriver/Result/StatementStatistics.php
+++ b/src/HttpDriver/Result/StatementStatistics.php
@@ -83,7 +83,7 @@ public function __construct(array $statistics = [])
         $keys = [
             'contains_updates', 'nodes_created', 'nodes_deleted', 'properties_set', 'labels_added', 'labels_removed',
             'indexes_added', 'indexes_removed', 'constraints_added', 'constraints_removed', 'relationship_deleted',
-            'relationships_created',
+            'relationships_created', 'contains_system_updates', 'system_updates',
         ];
 
         foreach ($statistics as $key => $value) {
diff --git a/src/HttpDriver/Session.php b/src/HttpDriver/Session.php
index 25026c4d..83f785d6 100644
--- a/src/HttpDriver/Session.php
+++ b/src/HttpDriver/Session.php
@@ -191,10 +191,8 @@ public function prepareRequest(Pipeline $pipeline)
             'statements' => $statements,
         ]);
         $headers = [
-            [
-                'X-Stream' => true,
-                'Content-Type' => 'application/json',
-            ],
+            'X-Stream' => true,
+            'Content-Type' => 'application/json',
         ];
 
         return $this->requestFactory->createRequest('POST', sprintf('%s/db/data/transaction/commit', $this->uri), $headers, $body);
diff --git a/tests/Issues/Issue40Test.php b/tests/Issues/Issue40Test.php
index 632fce6e..49972990 100644
--- a/tests/Issues/Issue40Test.php
+++ b/tests/Issues/Issue40Test.php
@@ -25,9 +25,9 @@ public function testIssue()
         $this->emptyDb();
         $this->client->run('CREATE (:BRIEF {id: 123})');
 
-        $query = 'MATCH (s:BRIEF {id:{brief_id}})
+        $query = 'MATCH (s:BRIEF {id: $brief_id})
     CREATE (n:BRIEFNOTECARD)
-    SET n += {data}
+    SET n += $data
     CREATE (n)-[:CARD_OF {order:0}]->(s)
     RETURN n';