MyModule.psake.ps1

properties {
    # This needs to be updated to fit your build
    $psd1 = $ModuleRootFolder\MyModule.psd1
}

Task IncrementVersion {
    $CurrentVersion = Test-ModuleManifest $Script:psd1 | Select-Object -ExpandProperty Version
    $Build = $ModuleManifestVersion.Build
    $Minor = $ModuleManifestVersion.Minor
    $Major = $ModuleManifestVersion.Major
    if ($IncrementMajorVersion){$Major++;$Minor=0;$Build=-1}
    elseif ($IncrementMinorVersion){$Minor++;$Build=-1}
    $Build++
    $NewVersion = [System.Version]$("{0}.{1}.{2}" -f $Major,$Minor,$Build)
    Update-ModuleManifest -Path $psd1 -ModuleVersion $NewVersion
}