diff --git a/knock.changes b/knock.changes
index 325b5f2..c166f75 100644
--- a/knock.changes
+++ b/knock.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Tue Sep 28 13:19:54 UTC 2021 - Johannes Segitz <jsegitz@suse.com>
+
+- Added hardening to systemd service(s) (bsc#1181400). Modified:
+  * knockd.service
+
 -------------------------------------------------------------------
 Wed May 19 08:49:35 UTC 2021 - Daniel Donisa <daniel.donisa@suse.com>
 
diff --git a/knockd.service b/knockd.service
index a6f7689..6ee1183 100644
--- a/knockd.service
+++ b/knockd.service
@@ -3,6 +3,19 @@ Description=Port-Knocking Daemon
 After=network.target
 
 [Service]
+# added automatically, for details please see
+# https://en.opensuse.org/openSUSE:Security_Features#Systemd_hardening_effort
+ProtectSystem=full
+ProtectHome=true
+PrivateDevices=true
+ProtectHostname=true
+ProtectClock=true
+ProtectKernelTunables=true
+ProtectKernelModules=true
+ProtectKernelLogs=true
+ProtectControlGroups=true
+RestrictRealtime=true
+# end of automatic additions 
 ExecStart=/usr/sbin/knockd
 
 [Install]