Apache Airflow webserver status "unhealthy"

[Hunteerq]

Apache Airflow version

2.11.0

If "Other Airflow 2 version" selected, which one?

No response

What happened?

All our Astronomer's webserver that runs apache airflow changed status to unhealthy from 12th of September. Recent logs show following error:

[2025-09-16T15:14:17.296+0000] {configuration.py:1237} WARNING - No module named 'flask_limiter.wrappers'

We noticed that Flask-Limiter version got automatically updated from 3.12 to 3.13 by following dependencies:

flask-limiter==3.13
    # via flask-appbuilder

flask-appbuilder==4.5.3
    # via apache-airflow-providers-fab

apache-airflow==2.11.0
    # via
    #   -c (workspace)
    #   apache-airflow-providers-amazon
    #   apache-airflow-providers-common-compat
    #   apache-airflow-providers-common-io
    #   apache-airflow-providers-common-sql
    #   apache-airflow-providers-fab
    #   apache-airflow-providers-ftp
    #   apache-airflow-providers-http
    #   apache-airflow-providers-imap
    #   apache-airflow-providers-microsoft-mssql
    #   apache-airflow-providers-sftp
    #   apache-airflow-providers-slack
    #   apache-airflow-providers-smtp
    #   apache-airflow-providers-snowflake
    #   apache-airflow-providers-sqlite
    #   apache-airflow-providers-ssh
    #   apache-airflow-providers-tableau
    #   astronomer-cosmos

Specifying Flask-Limiter==3.12 in our pyproject.toml forces airflow to use that version and solves the issue

What you think should happen instead?

Flask's dependencies should be set in stone, so there are no unexpected updates

How to reproduce

Deploy specified airflow's version, webserver could have same errors

Operating System

gitlab-runner 17.11.0

Versions of Apache Airflow Providers

No response

Deployment

Astronomer

Deployment details

No response

Anything else?

No response

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[boring-cyborg]

Thanks for opening your first issue here! Be sure to follow the issue template! If you are willing to raise PR to address this issue please do so, no need to wait for approval.

[potiuk]

You should talk to astronomer support about it.

[drallaxl]

Thanks. Setting Flask-Limiter==3.12 fixed my Airflow 2.10 deployment