# CiviCRM 5.1.1
Released May 15, 2018
- **[Synopsis](#synopsis)**
- **[Features](#features)**
- **[Bugs resolved](#bugs)**
- **[Credits](#credits)**
- **[Feedback](#feedback)**
## Synopsis
| *Does this version...?* | |
|:--------------------------------------------------------------- |:-------:|
| Fix security vulnerabilities? | no |
| Change the database schema? | no |
| **Alter the API?** | **yes** |
| Require attention to configuration options? | no |
| Fix problems installing or upgrading to a previous version? | no |
| Introduce features? | no |
| **Fix bugs?** | **yes** |
## Features
- **Add API action to rebuild multilingual schema
([12112](https://github.com/civicrm/civicrm-core/pull/12112))**
This adds a new API to assist administrators who encounter
upgrade issues on multi-lingual sites.
## Bugs resolved
- **Searching on non-primary addresses throws DB error
([12133](https://github.com/civicrm/civicrm-core/pull/12133))**
- **Email invoice fails with validation error
([12134](https://github.com/civicrm/civicrm-core/pull/12134))**
## Credits
This release was developed by the following authors and reviewers:
Australian Greens - Seamus Lee; JMA Consulting - Monish Deb; Lighthouse
Design and Consulting - Brian Shaughnessy; Wikimedia Foundation - Eileen
McNaughton
## Feedback
These release notes are edited by Tim Otten and Andie Hunt. If you'd like to
provide feedback on them, please login to https://chat.civicrm.org/civicrm and
contact `@agh1`.