Change record status: 
Project: 
Introduced in branch: 
8.0.x
Description: 

As of Drupal 8.0.0, the minimum supported version of MySQL has been raised to 5.5.3. Prior versions of MySQL are no longer supported by MySQL and many have known security vulnerabilities.

MySQL 5.5 also has some features relating to character sets and indexing that help improve internationalization and performance.

Impacts: 
Site builders, administrators, editors
Module developers
Updates Done (doc team, etc.)
Online documentation: 
Generic online documentation done
Theming guide: 
Theming guide done
Module developer documentation: 
Module developer documentation done
Examples project: 
Examples for developers done
Coder Review: 
Coder review done
Coder Upgrade: 
Coder upgrade done
Other: 
Other updates done
Details: 

Drupal system requirements was updated to reflect the new minimum MySQL version.
No other updates required.