Just updated from 5.0.87 to 6.0.0 and now receive the following when running:

Method not found: 'Void DbUp.Engine.Output.IUpgradeLog.WriteInformation(System.String, System.Object[])'.

at SqlServerExtensions.SqlDatabase(SupportedDatabasesForEnsureDatabase supported, String connectionString, IUpgradeLog logger, Int32 timeout, AzureDatabaseEdition azureDatabaseEdition, String collation)

This occurs in the EnsureDatabase.For.SqlDatabase(string) method.

Downgrading back to 5.0.87 resolves the issue.

Is it best to wait before updating?

Edit: There are no other updates pending to other packages.

Edit: Just noticed there's a closed related bug: #802