# Example: Major version upgrade from 1.1.1.0 to 1.2.0.2 with default parameter groups
<a name="cfn-engine-update-1110-1202-default"></a>

Find the `DBCluster` that you want to upgrade, and the template you used to create it. For example:

```
Description: Base Template to create Neptune Stack with Engine Version 1.1.1.0 using default Parameter Groups
Parameters:
  DbInstanceType:
    Description: Neptune DB instance type
    Type: String
    Default: db.r5.large
Resources:
  NeptuneDBCluster:
    Type: 'AWS::Neptune::DBCluster'
    Properties:
      EngineVersion: 1.1.1.0
  NeptuneDBInstance:
    Type: 'AWS::Neptune::DBInstance'
    Properties:
      DBClusterIdentifier:
        Ref: NeptuneDBCluster
      DBInstanceClass:
        Ref: DbInstanceType
    DependsOn:
      - NeptuneDBCluster
Outputs:
  DBClusterId:
    Description: Neptune Cluster Identifier
    Value:
      Ref: NeptuneDBCluster
```
+ Update the default `DBClusterParameterGroup` to the one in the parameter group family used by the new engine version (here `default.neptune1.2`).
+ For each `DBInstance` attached to the `DBCluster`, update the default `DBParameterGroup` to the one in the family used by new engine version (here `default.neptune1.2`).
+ Set the `DBInstanceParameterGroupName` property to the default parameter group in that family (here `default.neptune1.2`).
+ Update the `EngineVersion` property from `1.1.0.0` to `1.2.0.2`.

The template should look like this:

```
Description: Template to upgrade major engine version to 1.2.0.2 by using upgraded default parameter groups
Parameters:
  DbInstanceType:
    Description: Neptune DB instance type
    Type: String
    Default: db.r5.large
Resources:
  NeptuneDBCluster:
    Type: 'AWS::Neptune::DBCluster'
    Properties:
      EngineVersion: 1.2.0.2
      DBClusterParameterGroupName: default.neptune1.2
      DBInstanceParameterGroupName: default.neptune1.2
  NeptuneDBInstance:
    Type: 'AWS::Neptune::DBInstance'
    Properties:
      DBClusterIdentifier:
        Ref: NeptuneDBCluster
      DBInstanceClass:
        Ref: DbInstanceType
      DBParameterGroupName: default.neptune1.2
    DependsOn:
      - NeptuneDBCluster
Outputs:
  DBClusterId:
    Description: Neptune Cluster Identifier
    Value:
```

Now use CloudFormation to run the revised template.