diff --git a/src/Biblys/Isbn/groups-array.php b/src/Biblys/Isbn/groups-array.php
index 9845011..c015d97 100644
--- a/src/Biblys/Isbn/groups-array.php
+++ b/src/Biblys/Isbn/groups-array.php
@@ -41,7 +41,8 @@
         ['0100000', '0299999', 2],
         ['0300000', '0349999', 3],
         ['0350000', '0399999', 4],
-        ['0400000', '0499999', 3],
+        ['0400000', '0489999', 3],
+        ['0490000', '0499999', 4],
         ['0500000', '0599999', 2],
         ['0600000', '0669999', 0],
         ['0670000', '0699999', 7],
@@ -1082,7 +1083,8 @@
         ['9900000', '9999999', 5],
     ]],
     '978-984' => ['Bangladesh', [
-        ['0000000', '3999999', 2],
+        ['0000000', '3899999', 2],
+        ['3900000', '3999999', 4],
         ['4000000', '7999999', 3],
         ['8000000', '8999999', 4],
         ['9000000', '9999999', 5],