diff --git a/conf/systemd/frpc.service b/conf/systemd/frpc.service
index dd88ce01..61adb3c0 100644
--- a/conf/systemd/frpc.service
+++ b/conf/systemd/frpc.service
@@ -9,6 +9,10 @@ Restart=on-failure
 RestartSec=5s
 ExecStart=/usr/bin/frpc -c /etc/frp/frpc.ini
 ExecReload=/usr/bin/frpc reload -c /etc/frp/frpc.ini
+# see:
+#   https://github.com/containerd/containerd/issues/3201
+#   https://github.com/containerd/containerd/pull/3202
+LimitNOFILE=1048576
 
 [Install]
 WantedBy=multi-user.target
diff --git a/conf/systemd/frpc@.service b/conf/systemd/frpc@.service
index 9fa13ae8..5914ff6a 100644
--- a/conf/systemd/frpc@.service
+++ b/conf/systemd/frpc@.service
@@ -9,6 +9,7 @@ Restart=on-failure
 RestartSec=5s
 ExecStart=/usr/bin/frpc -c /etc/frp/%i.ini
 ExecReload=/usr/bin/frpc reload -c /etc/frp/%i.ini
+LimitNOFILE=1048576
 
 [Install]
 WantedBy=multi-user.target
diff --git a/conf/systemd/frps.service b/conf/systemd/frps.service
index 1daa2674..20c11756 100644
--- a/conf/systemd/frps.service
+++ b/conf/systemd/frps.service
@@ -8,6 +8,10 @@ User=nobody
 Restart=on-failure
 RestartSec=5s
 ExecStart=/usr/bin/frps -c /etc/frp/frps.ini
+# see:
+#   https://github.com/containerd/containerd/issues/3201
+#   https://github.com/containerd/containerd/pull/3202
+LimitNOFILE=1048576
 
 [Install]
 WantedBy=multi-user.target
diff --git a/conf/systemd/frps@.service b/conf/systemd/frps@.service
index 8b625ca7..2942e0ba 100644
--- a/conf/systemd/frps@.service
+++ b/conf/systemd/frps@.service
@@ -8,6 +8,7 @@ User=nobody
 Restart=on-failure
 RestartSec=5s
 ExecStart=/usr/bin/frps -c /etc/frp/%i.ini
+LimitNOFILE=1048576
 
 [Install]
 WantedBy=multi-user.target