diff --git a/src/zmb-member/install-service.sh b/src/zmb-member/install-service.sh
index f8c35ef..6e4e3e2 100644
--- a/src/zmb-member/install-service.sh
+++ b/src/zmb-member/install-service.sh
@@ -9,9 +9,11 @@ source /root/functions.sh
 source /root/zamba.conf
 source /root/constants-service.conf
 
+echo "deb http://ftp.halifax.rwth-aachen.de/debian/ bookworm-backports main contrib" >> /etc/apt/sources.list
+
 apt update
 
-DEBIAN_FRONTEND=noninteractive DEBIAN_PRIORITY=critical apt install -y -o DPkg::options::="--force-confdef" -o DPkg::options::="--force-confold" acl samba winbind libpam-winbind libnss-winbind krb5-user krb5-config samba-dsdb-modules samba-vfs-modules wsdd
+DEBIAN_FRONTEND=noninteractive DEBIAN_PRIORITY=critical apt install -t bookworm-backports -y -o DPkg::options::="--force-confdef" -o DPkg::options::="--force-confold" acl samba winbind libpam-winbind libnss-winbind krb5-user krb5-config samba-dsdb-modules samba-vfs-modules wsdd
 
 mv /etc/krb5.conf /etc/krb5.conf.bak
 cat > /etc/krb5.conf <<EOF