diff --git a/nixos/hosts/milan-linode-01/podman/derp.nix b/nixos/hosts/milan-linode-01/podman/derp.nix
index a1248f0e..da9efe34 100644
--- a/nixos/hosts/milan-linode-01/podman/derp.nix
+++ b/nixos/hosts/milan-linode-01/podman/derp.nix
@@ -12,9 +12,9 @@
     image = "docker.io/fredliang/derper";
     environment = {
       DERP_ADDR = ":1443";
-      DERP_CERT_DIR = "/app/certs";
-      DERP_CERT_MODE = "manual";
-      DERP_DOMAIN = "sysctl.io";
+      DERP_CERT_DIR = "/app/certs-temp";
+      DERP_CERT_MODE = "letsencrypt";
+      DERP_DOMAIN = "milan.sysctl.io";
       DERP_STUN = "true";
     };
     volumes = [