diff --git a/src/SlotDbClient.php b/src/SlotDbClient.php
index 71ebebd..c0da8fb 100644
--- a/src/SlotDbClient.php
+++ b/src/SlotDbClient.php
@@ -119,12 +119,16 @@ class SlotDbClient
      */
     public function queryGroup(string $groupId): array
     {
-        throw new \Exception("Not implemented");
+        $res = $this->get("/group/{$groupId}");
+        $data = json_decode($res->getBody(), true);
+        return $data;
     }
 
     public function updateGroup(string $groupId, array $props): array
     {
-        throw new \Exception("Not implemented");
+        $res = $this->post("/group/{$groupId}", $props);
+        $data = json_decode($res->getBody(), true);
+        return $data;
     }
 
     public function deleteGroup(string $groupId): void