[BUG] Watchtower won't ugrade calibre-web anymore

[leolivier]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

SInce 3 days, my watchtower is unable to update calibre-web with the following error:

Unable to update container "/calibre-web": Error response from daemon: Head "https://ghcr.io/v2/linuxserver/calibre-web/manifests/latest": Get "https://ghcr.io/token?scope=repository%3Alinuxserver%2Fcalibre-web%3Apull&service=ghcr.io": context deadline exceeded (Client.Timeout exceeded while awaiting headers). 

Note 1: watchtower works perfectly for all other 18 containers it monitors and worked already to update calibre-web several times in the past
Note 2: a manual docker compose pull + docker compose up -d --force-recreate works

Expected Behavior

No timeout on update...

Steps To Reproduce

1. Setup calibre-web:latest using docker compose
2. Setup watchtower to monitor calibre-web
3. See the error coming when watchtower tries to update calibre-web

Environment

- OS: raspberrypi OS
- docker installed using os package

CPU architecture

arm64

Docker creation

services:
  calibre-web:
    image: lscr.io/linuxserver/calibre-web:latest
    container_name: calibre-web
    environment:
      - PUID=1000
      - PGID=1000
      - TZ=Europe/Paris
    volumes:
      - ./config:/config
      - /nvme/sync-in/spaces/books/files:/books
    ports:
      - 8083:8083
    restart: unless-stopped
    healthcheck:
      test: ["CMD", "curl", "--fail", "http://localhost:8083/"]
      interval: 60s
      timeout: 60s
      start_period: 90s

Container logs

N/A in my case but all I can see after manual upgrade is:
[migrations] started
[migrations] no migrations found
───────────────────────────────────────

      ██╗     ███████╗██╗ ██████╗
      ██║     ██╔════╝██║██╔═══██╗
      ██║     ███████╗██║██║   ██║
      ██║     ╚════██║██║██║   ██║
      ███████╗███████║██║╚██████╔╝
      ╚══════╝╚══════╝╚═╝ ╚═════╝

   Brought to you by linuxserver.io
───────────────────────────────────────

To support the app dev(s) visit:
Calibre-Web: https://paypal.me/calibreweb

To support LSIO projects visit:
https://www.linuxserver.io/donate/

───────────────────────────────────────
GID/UID
───────────────────────────────────────

User UID:    1000
User GID:    1000
───────────────────────────────────────
[custom-init] No custom files found, skipping...
[2025-08-29 20:23:11,964]  WARN {warnings.py:110} /lsiopy/lib/python3.12/site-packages/pycountry/__init__.py:10: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.
  import pkg_resources

Connection to localhost (::1) 8083 port [tcp/*] succeeded!
[ls.io-init] done.

[aptalca]

We don't support or recommend watchtower for auto updates and we strongly recommend against auto (and unattended) updates in general.