---
title: Python-SDK - 5.5.0
slug: feature-experimentation/release-notes/python-sdk-v5-5-0
docTags: 
createdAt: 2026-07-20T15:44:24.845Z
---

## What's Changed

- \[FSSDK-12035] Update: Exclude CMAB from UserProfileService by @FarhanAnjum-opti in [https://github.com/optimizely/python-sdk/pull/474](https://github.com/optimizely/python-sdk/pull/474)
- \[FSSDK-12149] \[Python] Add Event Retries by @esrakartalOpt in [https://github.com/optimizely/python-sdk/pull/475](https://github.com/optimizely/python-sdk/pull/475)
- \[FSSDK-12276] update: replace flake8 with ruff by @FarhanAnjum-opti in [https://github.com/optimizely/python-sdk/pull/492](https://github.com/optimizely/python-sdk/pull/492)
- \[FSSDK-12320] bugfix: PollingConfigManager rejects valid URL-only configuration by @FarhanAnjum-opti in [https://github.com/optimizely/python-sdk/pull/497](https://github.com/optimizely/python-sdk/pull/497)
- \[FSSDK-12317] update: clear arnica risks by @FarhanAnjum-opti in [https://github.com/optimizely/python-sdk/pull/498](https://github.com/optimizely/python-sdk/pull/498)
- \[AI-FSSDK] \[FSSDK-12337] Add Feature Rollout support by @FarhanAnjum-opti in [https://github.com/optimizely/python-sdk/pull/499](https://github.com/optimizely/python-sdk/pull/499)
- \[AI-FSSDK] \[FSSDK-12418] Remove experiment type validation from config parsing by @FarhanAnjum-opti in [https://github.com/optimizely/python-sdk/pull/500](https://github.com/optimizely/python-sdk/pull/500)
- \[FSSDK-12497] Fix return in finally block silently swallowing exceptions by @FarhanAnjum-opti in [https://github.com/optimizely/python-sdk/pull/505](https://github.com/optimizely/python-sdk/pull/505)
- \[AI-FSSDK] \[FSSDK-12368] Cleanup flag base setup (local holdouts) by @Mat001 in [https://github.com/optimizely/python-sdk/pull/507](https://github.com/optimizely/python-sdk/pull/507)
- \[FSSDK-12521] chore: preparing for release v5.5.0 by @FarhanAnjum-opti in [https://github.com/optimizely/python-sdk/pull/508](https://github.com/optimizely/python-sdk/pull/508)

**Full Changelog**: [https://github.com/optimizely/python-sdk/compare/v5.4.0...v5.5.0](https://github.com/optimizely/python-sdk/compare/v5.4.0...v5.5.0)

[https://github.com/optimizely/python-sdk/releases/tag/v5.5.0](https://github.com/optimizely/python-sdk/releases/tag/v5.5.0)