PowerShell v6.0.4 is available from https://github.com/PowerShell/PowerShell/releases
From the release notes it appears to be just a fix to the mac installer and consolidation of the Nuget packages.
This is the second update to PowerShell v6.0 within a month. If you have a lot machines with v6.0 installed you need to think about automating the installation as you don’t get a patch but a complete new install package with each set of fixes.
under: PowerShell v6