diff --git a/config/etc/apt/sources.list.d/debian-security.list b/config/etc/apt/sources.list.d/debian-security.list
index cae6877..88224b9 100644
--- a/config/etc/apt/sources.list.d/debian-security.list
+++ b/config/etc/apt/sources.list.d/debian-security.list
@@ -1,2 +1,2 @@
-deb https://security.debian.org/debian-security bullseye-security main contrib non-free
-deb https://deb.debian.org/debian-security bullseye-security main contrib non-free
+deb https://security.debian.org/debian-security bookworm-security main contrib non-free
+deb https://deb.debian.org/debian-security bookworm-security main contrib non-free
diff --git a/config/etc/apt/sources.list.d/debian.list b/config/etc/apt/sources.list.d/debian.list
index 35b130e..d3c25d6 100644
--- a/config/etc/apt/sources.list.d/debian.list
+++ b/config/etc/apt/sources.list.d/debian.list
@@ -1 +1 @@
-deb https://deb.debian.org/debian bullseye main contrib non-free
+deb https://deb.debian.org/debian bookworm main contrib non-free
diff --git a/setup.sh b/setup.sh
index c3b43df..e9f5bf0 100755
--- a/setup.sh
+++ b/setup.sh
@@ -48,7 +48,7 @@ mkdir --parents "$chroot/longhorn/02"
 
 # debootstrap
 
-debootstrap --variant=minbase --arch=amd64 bullseye "$chroot" https://deb.debian.org/debian/
+debootstrap --variant=minbase --arch=amd64 bookworm "$chroot" https://deb.debian.org/debian/
 
 mount -t proc none "$chroot/proc"
 mount -t sysfs none "$chroot/sys"