diff --git a/hosts/chelsty-infra/runtime/zigbee2mqtt/docker-compose.override.yml b/hosts/chelsty-infra/runtime/zigbee2mqtt/docker-compose.override.yml
index e2a3c53..ce16619 100644
--- a/hosts/chelsty-infra/runtime/zigbee2mqtt/docker-compose.override.yml
+++ b/hosts/chelsty-infra/runtime/zigbee2mqtt/docker-compose.override.yml
@@ -3,13 +3,9 @@ services:
     # mosquitto runs with network_mode: host on chelsty-infra.
     # extra_hosts maps the 'mosquitto' hostname to the host gateway IP so that
     # mqtt://mosquitto:1883 in configuration.yaml reaches the host-networked
-    # mosquitto process. Works with docker-compose v1 (docker 20.10+).
+    # mosquitto process. Requires Docker 20.10+ (present on chelsty-infra).
     extra_hosts:
       - "mosquitto:host-gateway"
-    volumes:
-      # configuration.yaml lives in the runtime config dir (not in Git).
-      # On chelsty-infra: /opt/homelab/config/zigbee2mqtt/configuration.yaml
-      - /opt/homelab/config/zigbee2mqtt/configuration.yaml:/app/data/configuration.yaml:ro
     environment:
       - TZ=Europe/Warsaw
     healthcheck:
@@ -17,4 +13,9 @@ services:
       interval: 30s
       timeout: 10s
       retries: 3
-      start_period: 60s
+      start_period: 90s
+    # Note: volumes NOT overridden here.
+    # The base docker-compose.yml mounts /opt/homelab/data/zigbee2mqtt/data:/app/data
+    # (read-write). configuration.yaml must be placed in that directory on the node:
+    #   /opt/homelab/data/zigbee2mqtt/data/configuration.yaml
+    # z2m rewrites this file during migrations — read-only mount is not viable.