diff --git a/modules/nixos/homeassistant/services/esphome/default.nix b/modules/nixos/homeassistant/services/esphome/default.nix
index d703fe0..44bf944 100755
--- a/modules/nixos/homeassistant/services/esphome/default.nix
+++ b/modules/nixos/homeassistant/services/esphome/default.nix
@@ -13,7 +13,10 @@ in
     virtualisation.oci-containers.containers.esphome = {
       autoStart = true;
       image = "ghcr.io/esphome/esphome";
-      ports = [ "6052:6052" ];
+      # host networking is required for mDNS (multicast UDP) to work so that
+      # ESPHome can discover devices via <name>.local and perform OTA updates
+      # without needing to know device IPs in advance.
+      extraOptions = [ "--network=host" ];
       devices = [
         "/dev/ttyUSB0"
       ];