SSM Session Manager - Use Powershell 7

While Session Manager doesn't have a direct setting to use PowerShell 7 by default, Windows server comes with PowerShell 5.1 version. However you can use PowerShell version 7 by customizing your approach after starting a session.

• Install PowerShell 7 on a Windows instance.[+]

• Connect to the SSM session manager.

• Start PowerShell 7 by switching to new pwsh.exe using below command, as default path when we install PS 7.

     & 'C:\Program Files\PowerShell\7\pwsh.exe'
  

• Verify version of PowerShell that was being used using below command:

    $PSVersionTable
  

The default location of the PowerShell executable is at "C:\Windows\System32\WindowsPowerShell\v1.0" which is built into the OS and PowerShell 7 is one installed alongside PowerShell 5 and not an upgrade.

Remember that PowerShell 7 needs to be installed on the target EC2 instance for these methods to work.

Sources:

[+] Migrating from Windows PowerShell 5.1 to PowerShell 7