diff --git a/deploy_configs/mail4one.service b/deploy_configs/mail4one.service
index 10bb51e..9401a71 100644
--- a/deploy_configs/mail4one.service
+++ b/deploy_configs/mail4one.service
@@ -9,19 +9,20 @@ Requires=network-online.target
 [Service]
 User=mail4one
 ExecStart=/usr/local/bin/mail4one --config /etc/mail4one/config.json
+
 AmbientCapabilities=CAP_NET_BIND_SERVICE
+CapabilityBoundingSet=CAP_NET_BIND_SERVICE
+NoNewPrivileges=yes
 
 StateDirectory=mail4one/certs mail4one/mails
 StateDirectoryMode=0750
-UMask=
 LogsDirectory=mail4one
 WorkingDirectory=/var/lib/mail4one
 
 ProtectSystem=strict
 PrivateTmp=true
-PrivateUsers=true
 ProtectHome=yes
-NoNewPrivileges=yes
+ProtectProc=invisible
 
 [Install]
 WantedBy=multi-user.target