diff --git a/src/Biblys/Isbn/groups-array.php b/src/Biblys/Isbn/groups-array.php
index ca03094..5071b94 100644
--- a/src/Biblys/Isbn/groups-array.php
+++ b/src/Biblys/Isbn/groups-array.php
@@ -344,8 +344,8 @@
         ['0500000', '1999999', 0],
         ['2000000', '2499999', 3],
         ['2500000', '4999999', 0],
-        ['5000000', '6699999', 4],
-        ['6700000', '9299999', 0],
+        ['5000000', '6899999', 4],
+        ['6900000', '9299999', 0],
         ['9300000', '9999999', 5],
     ]],
     '978-625' => ['Türkiye', [