Would MySQL auto minor version upgrade be triggered in April?

Question

I have a MySQL server running version 8.0.35 and received the following alert regarding an automatic upgrade to 8.0.40:

>  Amazon RDS will automatically upgrade your MySQL databases running minor versions 8.0.36, 8.0.35, 8.0.34, 8.0.33, and 8.0.32 as well as any instances restored from the snapshots of these versions to 8.0.40 or higher during a scheduled maintenance window between March 31, 2025 12:01 AM PDT and April 30, 2025 12:01 AM PDT.

I would prefer to upgrade the server at the end of April due to business needs. However, does this message imply that the upgrade will be enforced during the first available maintenance window in April, even if auto minor version upgrades are disabled?

Thanks.

re:Post Agent · Answer

Based on the information provided, it appears that the automatic upgrade to MySQL 8.0.40 or higher will be enforced during your scheduled maintenance window between March 31, 2025, and April 30, 2025, regardless of your auto minor version upgrade settings.

This upgrade seems to be a mandatory upgrade, which Amazon RDS implements for critical fixes or when a version is approaching end of life. In such cases, the upgrade will proceed even if you have disabled automatic minor version upgrades for your DB instance.

The message you received indicates a specific timeframe for the upgrade, suggesting that this is a required update rather than a regular automatic minor version upgrade. Required upgrades are typically implemented to address important issues such as known security vulnerabilities, significant bugs, or to ensure overall fleet stability.

While you mentioned a preference to upgrade at the end of April due to business needs, it's important to note that the upgrade could occur at any point during the specified window, including early April. The exact timing would depend on your specific maintenance window within the broader upgrade period.

If you have critical business requirements that necessitate control over the exact timing of the upgrade, you may want to consider proactively upgrading your MySQL instance before the enforced upgrade window begins. This would allow you to choose a time that best suits your business needs while ensuring compliance with the required version update.

It's also worth noting that while you cannot prevent this upgrade, you can prepare for it by testing the new version in a separate environment, reviewing any potential compatibility issues, and planning for any necessary application adjustments before the upgrade occurs.  
**Sources**  
[Amazon Aurora versioning - Amazon Aurora](https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/Aurora.VersionPolicy.Versioning.html)  
[Automatic minor version upgrades for RDS for MySQL - Amazon Relational Database Service](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_UpgradeDBInstance.MySQL.Minor.html)  
[Automatic minor version upgrades for RDS for MariaDB - Amazon Relational Database Service](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_UpgradeDBInstance.MariaDB.Minor.html)

Would MySQL auto minor version upgrade be triggered in April?

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