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[FSSDK-12521] chore: preparing for release v5.5.0 #508

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[FSSDK-12521] chore: preparing for release v5.5.0 #508

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30 changes: 30 additions & 0 deletions CHANGELOG.md
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# Optimizely Python SDK Changelog

## 5.5.0
April 29th, 2026

### New Features

#### **Feature Rollout Support**

- Added support for Feature Rollouts, a new rule type that combines Targeted Delivery simplicity with A/B test measurement capabilities. During project config parsing, the "everyone else" variation from the flag's rollout is automatically injected into feature rollout experiments, enabling correct evaluation without changes to decision logic. ([#499](https://github.com/optimizely/python-sdk/pull/499))
- Removed experiment type validation from config parsing to support flexible rule types. ([#500](https://github.com/optimizely/python-sdk/pull/500))

---

### Enhancements

- Added event retry support for reliable event dispatching. ([#475](https://github.com/optimizely/python-sdk/pull/475))
- Excluded CMAB experiments from UserProfileService to prevent stale cached decisions. ([#474](https://github.com/optimizely/python-sdk/pull/474))
- Replaced flake8 with ruff for faster, more comprehensive linting. ([#492](https://github.com/optimizely/python-sdk/pull/492))
- Cleaned up flag-level holdout fields for simplified configuration. ([#507](https://github.com/optimizely/python-sdk/pull/507))
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@muzahidul-opti muzahidul-opti Apr 29, 2026

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Does cleaned up flag base holdout is ready to release? Our existing global ho client would be affected I guess. let's chat.

- Resolved Arnica code risk warnings. ([#498](https://github.com/optimizely/python-sdk/pull/498))

---

### Bug Fixes

- Fixed `return` in `finally` block silently swallowing exceptions. ([#505](https://github.com/optimizely/python-sdk/pull/505))
- Fixed `PollingConfigManager` rejecting valid URL-only configuration. ([#497](https://github.com/optimizely/python-sdk/pull/497))

---


## 5.4.0
December 19th, 2025

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2 changes: 1 addition & 1 deletion optimizely/version.py
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# See the License for the specific language governing permissions and
# limitations under the License.

version_info = (5, 4, 0)
version_info = (5, 5, 0)
__version__ = '.'.join(str(v) for v in version_info)
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