diff --git a/datetime.el b/datetime.el
index 2ca4af4..1623837 100644
--- a/datetime.el
+++ b/datetime.el
@@ -2082,7 +2082,7 @@ create based on timezones `datetime' knows about and their rules.
 
 Locale-specific timezone names are contained in a different
 database.  See `datetime-timezone-name-database-version'."
-  9)
+  10)
 
 (defun datetime-timezone-name-database-version ()
   "Return timezone name database version, a simple integer.
diff --git a/timezone-data.extmap b/timezone-data.extmap
index cac9c19..5cb6058 100644
Binary files a/timezone-data.extmap and b/timezone-data.extmap differ