diff --git a/BRANDING.mak b/BRANDING.mak
index 3cfb6f6b..ee0b1518 100644
--- a/BRANDING.mak
+++ b/BRANDING.mak
@@ -3,7 +3,7 @@
 
 VERSION_MAJOR = 1
 VERSION_MINOR = 3
-VERSION_MICRO = 20
+VERSION_MICRO = 21
 BRANDING_SHORTNAME = mainline
 BRANDING_LONGNAME = Mainline Kernels
 BRANDING_AUTHORNAME = Brian K. White
diff --git a/debian/changelog b/debian/changelog
index 735442da..1db19481 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+mainline (1.3.21) UNRELEASED; urgency=medium
+
+  * update notify-send.sh
+
+ -- Brian K. White <b.kenyon.w@gmail.com>  Tue, 27 Jun 2023 06:57:35 -0400
+
 mainline (1.3.20) unstable; urgency=medium
 
   * add support for external terminal programs