The automatic migration to MQTT protocol version 5 failed

[jakehawkes]

Describe the issue you are experiencing

I’m using the mosquitto addon (app) and it is reporting the above. The doc tells me to make sure my broker can support protocol v5, and tells me the addon does support it. But the addon is reporting the error.

What type of installation are you running?

Home Assistant OS

Which operating system are you running on?

Home Assistant Operating System

Which app are you reporting an issue with?

Mosquitto broker

What is the version of the app?

7.1.0

Steps to reproduce the issue

1. Do nothing
2. MQTT addon starts reporting it failed to automatically update to protocol v5

System Health information

System Information

version	core-2026.6.1
installation_type	Home Assistant OS
dev	false
hassio	true
docker	true
container_arch	amd64
user	root
virtualenv	false
python_version	3.14.5
os_name	Linux
os_version	6.12.85-haos
arch	x86_64
timezone	America/Edmonton
config_dir	/config

Home Assistant Community Store

GitHub API	ok
GitHub Content	ok
GitHub Web	ok
HACS Data	ok
GitHub API Calls Remaining	4996
Installed Version	2.0.5
Stage	running
Available Repositories	3122
Downloaded Repositories	13

Home Assistant Cloud

logged_in	false
can_reach_cert_server	ok
can_reach_cloud_auth	ok
can_reach_cloud	ok

Home Assistant Supervisor

host_os	Home Assistant OS 17.3
update_channel	stable
supervisor_version	supervisor-2026.05.1
agent_version	1.8.1
docker_version	29.3.1
disk_total	30.8 GB
disk_used	13.3 GB
nameservers	192.168.3.1
healthy	true
supported	true
host_connectivity	true
supervisor_connectivity	true
ntp_synchronized	true
virtualization	kvm
board	ova
supervisor_api	ok
version_api	ok
installed_addons	Samba share (12.6.1), Terminal & SSH (10.2.0), File editor (6.0.0), Network UPS Tools (0.18.0), Get HACS (1.3.1), Matter Server (8.5.0), Mosquitto broker (7.1.0)

Dashboards

dashboards	8
resources	7
views	10
mode	storage

Network Configuration

adapters	lo (disabled), enp0s18 (enabled, default, auto), docker0 (disabled), hassio (disabled), vethe0552b2 (disabled), vethf0f3c4c (disabled), veth0477b91 (disabled), vethb902e55 (disabled), veth5bcd75a (disabled), vethe8e4cca (disabled)
ipv4_addresses	lo (127.0.0.1/8), enp0s18 (192.168.3.139/24), docker0 (172.30.232.1/23), hassio (172.30.32.1/23), vethe0552b2 (), vethf0f3c4c (), veth0477b91 (), vethb902e55 (), veth5bcd75a (), vethe8e4cca ()
ipv6_addresses	lo (::1/128), enp0s18 (fdb5:a65a:2e3b:28d3:f731:3bd6:3243:61b2/64, fe80::f83c:59ca:537c:7059/64), docker0 (fe80::83b:e0ff:fe4b:47c4/64), hassio (fd0c:ac1e:2100::1/48, fe80::18b6:4dff:fea8:726f/64), vethe0552b2 (fe80::44f4:c3ff:fe0f:21fa/64), vethf0f3c4c (fe80::58dc:58ff:fe79:56d5/64), veth0477b91 (fe80::208d:fff:fe91:8ea8/64), vethb902e55 (fe80::dc0d:dcff:fe9d:8923/64), veth5bcd75a (fe80::64b9:d2ff:fec9:eeed/64), vethe8e4cca (fe80::c72:28ff:fefc:b12f/64)
announce_addresses	192.168.3.139, fdb5:a65a:2e3b:28d3:f731:3bd6:3243:61b2, fe80::f83c:59ca:537c:7059

Recorder

oldest_recorder_run	May 17, 2026 at 6:01 AM
current_recorder_run	June 6, 2026 at 2:20 PM
estimated_db_size	1121.81 MiB
database_engine	sqlite
database_version	3.49.2

Anything in the Supervisor logs that might be useful for us?

Anything in the app logs that might be useful for us?

Additional information

No response

[OberstKlein]

Same at me.

Installationsmethode
Home Assistant OS
Core
2026.6.1
Supervisor
2026.05.1
Operating System
17.3
Frontend
20260527.4

Mosquito 7.1.0

Since 2026.6.0 I think starts this warning, but I can't find something usefull.