# Upgrading the RDS for Oracle DB engine
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When Amazon RDS supports a new version of Oracle Database, you can upgrade your DB instances to the new version. For information about which Oracle versions are available on Amazon RDS, see [https://docs.amazonaws.cn/AmazonRDS/latest/OracleReleaseNotes/Welcome.html](https://docs.amazonaws.cn/AmazonRDS/latest/OracleReleaseNotes/Welcome.html).

**Important**  
RDS for Oracle Databases 11g, 12c, and 18c are no longer supported. If you maintain Oracle Database 11g, 12c, or 18c snapshots, you can upgrade them to a later release. For more information, see [Upgrading an Oracle DB snapshot](USER_UpgradeDBSnapshot.Oracle.md).

**Topics**
+ [Overview of RDS for Oracle engine upgrades](USER_UpgradeDBInstance.Oracle.Overview.md)
+ [Oracle major version upgrades](USER_UpgradeDBInstance.Oracle.Major.md)
+ [Oracle minor version upgrades](USER_UpgradeDBInstance.Oracle.Minor.md)
+ [Considerations for Oracle database upgrades](USER_UpgradeDBInstance.Oracle.OGPG.md)
+ [Testing an Oracle DB upgrade](USER_UpgradeDBInstance.Oracle.UpgradeTesting.md)
+ [Upgrading the version of an RDS for Oracle DB instance](USER_UpgradeDBInstance.Oracle.Upgrading.md)
+ [Upgrading an Oracle DB snapshot](USER_UpgradeDBSnapshot.Oracle.md)