AttributeError: 'Version' object has no attribute 'dict' with packaging 26.0 #499

New Issue

MrUnknownDE · 2026-04-05T16:37:35+02:00

MrUnknownDE commented

2026-04-05 16:37:35 +02:00

Originally created by @kylephillipsau on 1/22/2026

NetBox Edition

NetBox Community

NetBox Version

v4.5.1

Python Version

3.12

Steps to Reproduce

Upgrade to NetBox 4.5.1 from 4.5.0 (no plugins installed)
Run ./upgrade.sh (which installs latest dependencies, including packaging==26.0 as a transitive dependency)
Restart NetBox services
Access NetBox in browser and the following error occurs:

<class 'AttributeError'>
'Version' object has no attribute `__dict__`

Expected Behavior

NetBox loads normally after upgrade without errors.

Observed Behavior

Error:

<class 'AttributeError'>
'Version' object has no attribute `__dict__`

The packaging library version 26.0 added __slots__ to the Version class (https://github.com/pypa/packaging/pull/1001), which removes the __dict__ attribute. This breaks any code that attempts to access Version().__dict__.

packaging is a transitive dependency installed via gunicorn, mkdocs, and/or strawberry-graphql.

The workaround I used to get it working:

cd /opt/netbox
source venv/bin/activate
pip install 'packaging<26.0'
sudo systemctl restart netbox netbox-rq

*Originally created by @kylephillipsau on 1/22/2026* ### NetBox Edition NetBox Community ### NetBox Version v4.5.1 ### Python Version 3.12 ### Steps to Reproduce 1. Upgrade to NetBox 4.5.1 from 4.5.0 (no plugins installed) 2. Run ./upgrade.sh (which installs latest dependencies, including packaging==26.0 as a transitive dependency) 3. Restart NetBox services 4. Access NetBox in browser and the following error occurs: ``` <class 'AttributeError'> 'Version' object has no attribute `__dict__` ``` ### Expected Behavior NetBox loads normally after upgrade without errors. ### Observed Behavior Error: ``` <class 'AttributeError'> 'Version' object has no attribute `__dict__` ``` The packaging library version 26.0 added `__slots__` to the Version class (https://github.com/pypa/packaging/pull/1001), which removes the `__dict__` attribute. This breaks any code that attempts to access Version().`__dict__`. packaging is a transitive dependency installed via gunicorn, mkdocs, and/or strawberry-graphql. The workaround I used to get it working: ``` cd /opt/netbox source venv/bin/activate pip install 'packaging<26.0' sudo systemctl restart netbox netbox-rq ```

MrUnknownDE closed this issue

2026-04-05 16:37:35 +02:00

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Branches Tags

main

21455-sql-indexes-audit

21357-register-model-actions

feature

20924-plugin-ui-components

21766-improve-test-coverage-for-sortable-table-columns

21157-export-template-public-models

21025-pre-render-config-contexts

21364-swagger

feature-ip-prefix-link

20911-dropdown-3

fix_module_substitution

21160-filterset

20911-dropdown-2

20044-elevation-stuck-lightmode

7604-filter-modifiers-v3

20660-script-load

19724-graphql

14884-script

19720-macaddress-interface-generic-relation

fix-19669-api-image-download

7604-filter-modifiers

19275-fixes-interface-bulk-edit

fix-17794-get_field_value_return_list

11507-show-aggregate-and-rir-on-api

9583-add_column_specific_search_field_to_tables

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Reference: github/netbox#499