diff --git a/de/heat-templates/scripts/instance_boot.sh b/de/heat-templates/scripts/instance_boot.sh
index 859f182..4d36ca4 100644
--- a/de/heat-templates/scripts/instance_boot.sh
+++ b/de/heat-templates/scripts/instance_boot.sh
@@ -121,7 +121,7 @@
 
     function install_retry {
         apt update
-        export DEBIAN_FRONTEND=noninteractive; apt install -y apt-transport-https ca-certificates curl software-properties-common jq unzip atop iptables-persistent socat
+        export DEBIAN_FRONTEND=noninteractive; apt install -y apt-transport-https ca-certificates curl software-properties-common jq unzip atop iptables-persistent socat ntp
     }
     retry 10 "Failed to install required packages" install_retry
 }
@@ -251,29 +251,41 @@
 }
 
 function configure_ntp {
-    cat << EOF > /etc/systemd/timesyncd.conf
-#  This file is part of systemd.
-#
-#  systemd is free software; you can redistribute it and/or modify it
-#  under the terms of the GNU Lesser General Public License as published by
-#  the Free Software Foundation; either version 2.1 of the License, or
-#  (at your option) any later version.
-#
-# Entries in this file show the compile time defaults.
-# You can change settings by editing this file.
-# Defaults can be restored by simply deleting this file.
-#
-# See timesyncd.conf(5) for details.
+    cat << EOF > /etc/ntp.conf
+# ntpd will only synchronize your clock.
 
-[Time]
-NTP=${NTP_SERVERS}
-#FallbackNTP=ntp.ubuntu.com
-#RootDistanceMaxSec=5
-#PollIntervalMinSec=32
-#PollIntervalMaxSec=2048
+# For details, see:
+# - the ntp.conf man page
+# - http://support.ntp.org/bin/view/Support/GettingStarted
+
+# Specify one or more NTP servers.
 EOF
 
-    systemctl restart systemd-timesyncd
+    for server in $NTP_SERVERS; do
+cat << EOF >> /etc/ntp.conf
+server ${server} iburst
+EOF
+    done
+
+    cat << EOF >> /etc/ntp.conf
+# Set general access to this service
+restrict -4 default kod nomodify notrap nopeer noquery
+restrict -6 default kod nomodify notrap nopeer noquery
+
+# Allow access from localhost
+restrict 127.0.0.1
+restrict ::1
+
+# Do not listen on any interface address by default
+interface ignore wildcard
+interface listen lo
+interface listen ${DEFAULT_INTERFACE}
+
+# Location of drift file
+driftfile /var/lib/ntp/ntp.drift
+EOF
+
+    systemctl restart ntp
 }
 
 function prepare_network {
@@ -285,8 +297,6 @@
     systemctl restart systemd-resolved
     # Make sure local hostname is present in /etc/hosts
     sed -i "s/127.0.0.1 localhost/127.0.0.1 localhost\n${CONTROL_IP_ADDRESS} $(hostname)/" /etc/hosts
-
-    configure_ntp
 }
 
 function workaround_default_forward_policy {
@@ -487,6 +497,7 @@
         prepare_network
         prepare_docker_config
         install_required_packages
+        configure_ntp
         configure_atop
         workaround_default_forward_policy
         install_docker
@@ -510,6 +521,7 @@
         prepare_network
         prepare_docker_config
         install_required_packages
+        configure_ntp
         configure_atop
         workaround_default_forward_policy
         install_docker
@@ -530,6 +542,7 @@
         prepare_network
         prepare_docker_config
         install_required_packages
+        configure_ntp
         configure_atop
         workaround_default_forward_policy
         install_docker
@@ -549,6 +562,7 @@
         prepare_network
         prepare_docker_config
         install_required_packages
+        configure_ntp
         configure_atop
         install_docker
         download_bundles