diff --git a/INSTALL.d/INSTALL.Debian.txt b/INSTALL.d/INSTALL.Debian.txt
index ff43dad..45d6767 100644
--- a/INSTALL.d/INSTALL.Debian.txt
+++ b/INSTALL.d/INSTALL.Debian.txt
@@ -7,7 +7,7 @@ https://imapsync.lamiral.info/INSTALL.d/INSTALL.Debian.txt
 
 
 There is four install sections in this document,
-1) one for Debian 9 Stretch, Debian 10 Buster, Debian 11 Bullseye
+1) one for Debian 9 Stretch, Debian 10 Buster, Debian 11 Bullseye, Debian 12 Bookworm
 2) one for all the Debian, called "After installing the dependencies".
 3) one for Debian 8 Jessie (obsolete)
 4) one for Debian 7 Wheezy (even more obsolete)
@@ -20,6 +20,7 @@ Type on a terminal:
 
     cat /etc/debian_version
 
+12.x => Bookworm
 11.x => Bullseye
 10.x => Buster
  9.x => Stretch
@@ -50,6 +51,11 @@ How to install imapsync dependencies on a Debian system?
 The repositories are the classical ones, ie, a
 /etc/apt/sources.list file with:
 
+# Debian 12 Bookworm
+deb http://deb.debian.org/debian bookworm main contrib
+
+or
+
 # Debian 11 Bullseye
 deb http://deb.debian.org/debian bullseye main contrib