diff --git a/style.css b/style.css
index a911885..1078c6c 100644
--- a/style.css
+++ b/style.css
@@ -2,7 +2,7 @@
 Theme Name:         Aldine
 Theme URI:          https://github.com/pressbooks/pressbooks-aldine/
 Description:        Aldine is the default theme for the home page of Pressbooks networks. It is named for the Aldine Press, founded by Aldus Manutius in 1494, who is regarded by many as the world’s first publisher.
-Version:            1.6.3
+Version:            1.6.4-dev
 Author:             Pressbooks (Book Oven Inc.)
 Author URI:         https://pressbooks.org
 Text Domain:        pressbooks-aldine